10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-K

(Mark One)

☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the fiscal year ended December 31, 2020

OR

☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission File Number 001-34620

IRONWOOD PHARMACEUTICALS, INC.

(Exact name of registrant as specified in its charter)

Delaware (State or other jurisdiction of incorporation or organization)	04-3404176 (I.R.S. Employer Identification Number)
100 Summer Street, Suite 2300 Boston, Massachusetts (Address of Principal Executive Offices)	02110 (Zip Code)

(617) 621-7722

(Registrant’s telephone number, including area code)

Securities registered pursuant to Section 12(b) of the Act:

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Class A Common Stock, $0.001 par value	IRWD	Nasdaq Global Select Market

Securities registered pursuant to Section 12(g) of the Act: None

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act. Yes ☒ No ☐

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or 15(d) of the Exchange Act. Yes ☐ No ☒

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports) and (2) has been subject to such filing requirements for the past 90 days. Yes ☒ No ☐

Indicate by check mark whether the Registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the Registrant was required to submit and post such files). Yes ☒ No ☐

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See the definitions of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growth company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer ☒ Accelerated filer ☐ Non-accelerated filer ☐ Smaller reporting company ☐ Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internal control over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm that prepared or issued its audit report. ☒

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes ☐ No ☒

Aggregate market value of voting stock held by non-affiliates of the Registrant as of June 30, 2020: $1,634,804,172

As of February 10, 2021, there were 160,962,175 shares of Class A Common Stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE:

Portions of the definitive proxy statement for our 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this report.

NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K, including the sections titled “Business,” “Risk Factors” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations”, contains forward-looking statements. All statements contained in this Annual Report on Form 10-K other than statements of historical fact are forward-looking statements. Forward-looking statements include statements regarding our future financial position, business strategy, budgets, projected costs, plans and objectives of management for future operations. The words “may,” “continue,” “estimate,” “intend,” “plan,” “will,” “believe,” “project,” “expect,” “seek,” “anticipate,” “could,” “should,” “target,” “goal,” “potential” and similar expressions may identify forward-looking statements, but the absence of these words does not necessarily mean that a statement is not forward-looking. These forward-looking statements include, among other things, statements about:

● the demand and market potential for our products in the countries where they are approved for marketing, as well as the revenues therefrom;

● the timing, investment and associated activities involved in commercializing LINZESS^® by us and AbbVie Inc. in the U.S.;

● the commercialization of CONSTELLA^® in Europe and LINZESS in Japan and China, as well as our expectations regarding revenue generated from our partners;

● the timing, investment and associated activities involved in developing, obtaining regulatory approval for, launching, and commercializing our products and product candidates by us and our partners worldwide;

● our ability and the ability of our partners to secure and maintain adequate reimbursement for our products;

● our ability and the ability of our partners and third parties to manufacture and distribute sufficient amounts of linaclotide active pharmaceutical ingredient, finished drug product and finished goods, as applicable, on a commercial scale;

● our expectations regarding U.S. and foreign regulatory requirements for our products and our product candidates, including our post-approval development and regulatory requirements;

● the ability of our product candidates to meet existing or future regulatory standards;

● the safety profile and related adverse events of our products and our product candidates;

● the therapeutic benefits and effectiveness of our products and our product candidates and the potential indications and market opportunities therefor;

● our and our partners’ ability to obtain and maintain intellectual property protection for our products and our product candidates and the strength thereof, as well as Abbreviated New Drug Applications filed by generic drug manufacturers and potential U.S. Food and Drug Administration approval thereof, and associated patent infringement suits that we have filed or may file, or other action that we may take against such companies, and the timing and resolution thereof;

● our and our partners’ ability to perform our respective obligations under our collaboration, license and other agreements, and our ability to achieve milestone and other payments under such agreements;

● our plans with respect to the development, manufacture or sale of our product candidates and the associated timing thereof, including the design and results of pre-clinical and clinical studies;

● our plans relating to discontinuing development of IW-3718;

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● the in-licensing or acquisition of externally discovered businesses, products or technologies, as well as partnering arrangements, including expectations relating to the completion of, or the realization of the expected benefits from, such transactions;

● our expectations as to future financial performance, revenues, expense levels, payments, cash flows, profitability, tax obligations, capital raising and liquidity sources, and real estate needs, as well as the timing and drivers thereof, and internal control over financial reporting;

● our ability to repay our outstanding indebtedness when due, or redeem or repurchase all or a portion of such debt, as well as the potential benefits of the note hedge transactions and capped call transactions described herein;

● asset impairments, and the drivers thereof, and purchase commitments;

● our ability to compete with other companies that are or may be developing or selling products that are competitive with our products and product candidates;

● the status of government regulation in the life sciences industry, particularly with respect to healthcare reform;

● trends and challenges in our potential markets;

● our ability to attract, motivate and retain key personnel;

● any benefits or costs of the separation of the Company’s operations into two independent, publicly traded companies, including the tax treatment;

● the financial and operational impacts of the COVID-19 pandemic on our business and results of operations, including impacts on our day-to-day operations, collaborative arrangements revenue and marketing efforts, manufacturing and supply chain and clinical development of our pipeline; and

● other factors discussed elsewhere in this Annual Report on Form 10-K.

Any or all of our forward-looking statements in this Annual Report on Form 10-K may turn out to be inaccurate. These forward-looking statements may be affected by inaccurate assumptions or by known or unknown risks and uncertainties, including the risks, uncertainties and assumptions identified under the heading “Risk Factors” in this Annual Report on Form 10-K. In light of these risks, uncertainties and assumptions, the forward-looking events and circumstances discussed in this Annual Report on Form 10-K may not occur as contemplated, and actual results could differ materially from those anticipated or implied by the forward-looking statements.

You should not unduly rely on these forward-looking statements, which speak only as of the date of this Annual Report on Form 10-K. Unless required by law, we undertake no obligation to publicly update or revise any forward-looking statements to reflect new information or future events or otherwise. You should, however, review the factors and risks we describe in the reports we will file from time to time with the U.S. Securities and Exchange Commission, or the SEC, after the date of this Annual Report on Form 10-K.

Summary of Risks Associated with our Business

Our business is subject to a number of risks, which are discussed more fully under the heading “Risk Factors” in this Annual Report on Form 10-K. These risks include the following:

● We are highly dependent on the commercial success of LINZESS® (linaclotide) in the United States for the foreseeable future; we cannot guarantee that we will generate sufficient revenues from LINZESS to cover our expenses.

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● Our products may cause undesirable side effects or have other properties that could limit their commercial potential.

● We are subject to uncertainty relating to pricing and reimbursement policies in the U.S. which, if not favorable for our products, could hinder or prevent our products’ commercial success.

● We must work effectively and collaboratively with AbbVie to market and sell LINZESS in the U.S., and must adapt our commercial model and market strategy to the evolving landscape, for LINZESS to achieve its maximum commercial potential.

● We face competition and new products may emerge that provide different or better alternatives for treatment of the conditions that our products are approved to treat.

● Even though LINZESS is approved by the U.S. Food and Drug Administration, or U.S. FDA, for use in adult patients, post-approval development and regulatory requirements still remain, which present additional challenges.

● If we are unable to execute on our strategy to in-license or acquire externally developed products or product candidates, or engage in other transactions with value creation potential, our business and prospects would be materially adversely affected.

● Our failure to successfully develop and commercialize additional product candidates or approved products would impair our ability to grow and/or adversely affect our business.

● Because we work with partners to develop, manufacture and commercialize linaclotide, we are dependent upon third parties, and our and our partners’ relationships with those third parties, in our and our partners’ efforts to obtain regulatory approval for, and to commercialize, linaclotide, as well as to comply with regulatory and other obligations with respect to linaclotide.

● Limitations on our ability to obtain patent protection and/or the patent rights relating to our products and our product candidates may limit our ability to prevent third parties from competing against us.

● Our indebtedness could adversely affect our financial condition or restrict our future operations.

● Public health emergencies, epidemics, or pandemics, such as the COVID-19 pandemic, impact our business.

NOTE REGARDING TRADEMARKS

LINZESS^® and CONSTELLA^® are trademarks of Ironwood Pharmaceuticals, Inc. ZURAMPIC^® and DUZALLO^® are trademarks of AstraZeneca AB. Any other trademarks referred to in this Annual Report on Form 10-K are the property of their respective owners. All rights reserved.

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TABLE OF CONTENTS

		Page
	PART I
Item 1.	Business	5
Item 1A.	Risk Factors	19
Item 1B.	Unresolved Staff Comments	47
Item 2.	Properties	47
Item 3.	Legal Proceedings	47
Item 4.	Mine Safety Disclosures	47
	PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	48
Item 6.	Selected Financial Data	50
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	53
Item 7A.	Quantitative and Qualitative Disclosures about Market Risk	73
Item 8.	Financial Statements and Supplementary Data	73
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	74
Item 9A.	Controls and Procedures	74
Item 9B.	Other Information	76
	PART III
Item 10.	Directors, Executive Officers and Corporate Governance	76
Item 11.	Executive Compensation	76
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	76
Item 13.	Certain Relationships and Related Transactions, and Director Independence	77
Item 14.	Principal Accountant Fees and Services	77
	PART IV
Item 15.	Exhibits and Financial Statement Schedules	78
Item 16.	Form 10-K Summary	84
	Signatures	85
	Index to Consolidated Financial Statements	F-1

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PART I

Item 1.    Business

Our Company

We are a gastrointestinal, or GI, healthcare company dedicated to advancing the treatment of GI diseases and redefining the standard of care for GI patients. We are focused on the development and commercialization of innovative GI product opportunities in areas of significant unmet need, leveraging our demonstrated expertise and capabilities in GI diseases.

LINZESS^® (linaclotide), our commercial product, is the first product approved by the United States Food and Drug Administration, or U.S. FDA, in a class of GI medicines called guanylate cyclase type C agonists and is indicated for adult men and women suffering from irritable bowel syndrome with constipation, or IBS-C, or chronic idiopathic constipation, or CIC. LINZESS is available to adult men and women suffering from IBS-C or CIC in the United States, or the U.S., and Mexico and to adult men and women suffering from IBS-C in Japan and China. Linaclotide is available under the trademarked name CONSTELLA^® to adult men and women suffering from IBS-C or CIC in Canada, and to adult men and women suffering from IBS-C in certain European countries.

We have strategic partnerships with leading pharmaceutical companies to support the development and commercialization of linaclotide throughout the world, including with AbbVie Inc. (together with its affiliates), or AbbVie, (successor to Allergan plc (together with its affiliates), or Allergan) in the U.S. and all countries worldwide other than China (including Hong Kong and Macau) and Japan, AstraZeneca AB (together with its affiliates, or AstraZeneca) in China (including Hong Kong and Macau), and Astellas Pharma Inc., or Astellas, in Japan. We also aim to leverage our leading capabilities in GI to bring additional treatment options to GI patients; for example, we have a U.S. disease education and promotional agreement with Alnylam Pharmaceuticals, Inc., or Alnylam, for Alnylam’s GIVLAARI® (givosiran) for the treatment of acute hepatic porphyria, or AHP.

On April 1, 2019, we completed a tax-free spin-off of our soluble guanylate cyclase, or sGC, business into a separate publicly traded company, Cyclerion Therapeutics, Inc., or Cyclerion. In completing the separation of our sGC business into Cyclerion, or the Separation, we advanced our strategy to drive growth as a GI-focused healthcare company, building on our commercial success with LINZESS and advancing our GI development capabilities. In 2021, we refreshed our GI-focused strategy following our decision to discontinue our IW-3718 and MD-7246 development programs and now are focused on three core priorities: maximize LINZESS, build our innovative GI pipeline and deliver sustained profits and generate cash flow.

We were incorporated in Delaware on January 5, 1998 as Microbia, Inc. On April 7, 2008, we changed our name to Ironwood Pharmaceuticals, Inc. To date, we have dedicated a majority of our activities to the research, development and commercialization of linaclotide, as well as to the research and development of our other product candidates.

Performance Against 2020 Core Priorities

1. Drive LINZESS Growth

● We recognized approximately $368.6 million in collaborative arrangements revenue related to sales of LINZESS in the U.S. during the year ended December 31, 2020, a 13% increase compared to the year ended December 31, 2019. This increase was primarily driven by an increase in LINZESS prescription demand in the U.S. in 2020 compared to 2019.

● The U.S. FDA approved a supplemental New Drug Application, or NDA, for LINZESS, resulting in updated U.S. prescribing information with data demonstrating that linaclotide improved the overall abdominal symptoms of bloating, discomfort, and pain in adult patients with IBS-C compared to placebo.

● We and AbbVie entered into settlement agreements with the two remaining generic drug manufacturers resolving all pending patent infringement litigation brought in response to abbreviated New Drug

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Applications seeking approval to market generic versions of LINZESS prior to the expiration of our and AbbVie’s applicable patents.

● The United States Patent and Trademark Office granted patents covering the formulation of the 72 mcg dose of LINZESS and methods of using the formulation. The patents are expected to expire in 2031.

2. Advance U.S. GI Development Portfolio

● MD-7246: We and AbbVie announced top-line data from a Phase II trial evaluating MD-7246, a delayed release formulation of linaclotide, in adult patients with abdominal pain associated with irritable bowel syndrome with diarrhea, or IBS-D. The Phase II trial did not meet its primary or key secondary endpoints. Based on these findings, we and AbbVie discontinued the development of MD-7246.

● IW-3718: We announced that one of our two identical Phase III trials evaluating IW-3718, a gastric retentive formulation of a bile acid sequestrant, in refractory gastroesophageal reflux disease, or refractory GERD, did not meet the pre-specified criteria associated with a planned early efficacy assessment. Following the assessment from an independent data monitoring committee, we unblinded the data and confirmed that the data from this Phase III trial did not meet the criteria, including the study’s primary endpoint of achieving a statistically significant improvement in heartburn severity. Based on these findings, we are discontinuing the development of IW-3718.

3. Deliver Sustainable Profits

● Delivered net income of $106.2 million during the year ended December 31, 2020, reflecting our second full year of profitability.

● We generated $168.8 million in cash from operations during the year ended December 31, 2020, ending the year with $362.6 million in cash and cash equivalents.

● In connection with our decision to discontinue IW-3718 development, we reduced our workforce by approximately 100 full-time employees. This workforce reduction affected both field-based and home-office employees, including the relevant general and administrative support functions. We substantially completed the reduction in our workforce in the fourth quarter of 2020.

Impact of the COVID-19 Pandemic on our Business

There continue to be significant uncertainties surrounding the extent and duration of the impact of the COVID-19 pandemic on our business and operations. The COVID-19 pandemic resulted in changes to our business and operations which impacted our financial condition and results of operations for the year ended December 31, 2020 and the COVID-19 pandemic may have a material adverse impact on our business and financial condition in the future. We took important actions in 2020 designed to mitigate the impacts of the COVID-19 pandemic on our business. We continue to evaluate the impact of the COVID-19 pandemic on our operating results and financial condition. The impact of COVID-19 on our business and financial condition is more fully described below in Part II, Item 7: Management's Discussion and Analysis of Financial Condition and Results of —Trends and Uncertainties.

GI Programs – IBS-C and CIC

IBS-C and CIC are chronic, functional GI disorders that afflict millions of sufferers worldwide. As many as 11.5 million adults suffer from IBS-C and as many as 28.5 million adults suffer from CIC in the U.S., according to the Lieberman GI Patient Landscape Survey performed in 2010, or the Lieberman Survey. Symptoms of IBS-C include abdominal pain, discomfort and/or bloating and constipation symptoms (e.g., incomplete evacuation, infrequent bowel movements, hard/lumpy stools), while CIC is primarily characterized by constipation symptoms. Greater than 65% of IBS-C patients suffer from bloating and/or discomfort at least one time per week, according to the Lieberman Survey.

Linaclotide—U.S. In August 2012, the U.S. FDA approved LINZESS as a once-daily treatment for adult men and women suffering from IBS-C (290 mcg dose) or CIC (145 mcg dose). We and AbbVie began commercializing

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LINZESS in the U.S. in December 2012. In January 2017, the U.S. FDA approved a 72 mcg dose of linaclotide for the treatment of adult men and women with CIC.

We and AbbVie continue to explore ways to enhance the clinical profile of linaclotide by studying linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions. In September 2020, based on Phase IIIb data demonstrating the efficacy and safety of LINZESS 290 mcg on the overall abdominal symptoms of bloating, pain and discomfort, in adult patients with IBS-C, the U.S. FDA approved our Supplemental New Drug Application to include a more comprehensive description of the effects of LINZESS in its approved label.

We and AbbVie have established a nonclinical and clinical post-marketing plan with the U.S. FDA to understand the safety and efficacy of LINZESS in pediatric patients. Clinical pediatric programs in IBS-C and functional constipation are ongoing.

Linaclotide—Global. AbbVie has rights to develop and commercialize linaclotide in all countries worldwide other than China (including Hong Kong and Macau) and Japan. In November 2012, the European Commission granted marketing authorization to CONSTELLA for the symptomatic treatment of moderate to severe IBS-C in adults. CONSTELLA is the first, and to date, only drug approved in the European Union, or E.U., for IBS-C. CONSTELLA first became commercially available in certain European countries beginning in the second quarter of 2013. AbbVie is commercializing CONSTELLA in a number of European countries, including the United Kingdom, Italy and Spain.

In December 2013 and February 2014, linaclotide was approved in Canada and Mexico, respectively, as a treatment for adult men and women suffering from IBS-C or CIC. AbbVie has exclusive rights to commercialize linaclotide in Canada as CONSTELLA and in Mexico as LINZESS. In May 2014, CONSTELLA became commercially available in Canada and in June 2014, LINZESS became commercially available in Mexico.

Astellas has rights to develop, manufacture and commercialize linaclotide in Japan. In December 2016, the Japanese Ministry of Health, Labor and Welfare approved LINZESS for the treatment of adults with IBS-C in Japan. In March 2017, Astellas began commercializing LINZESS for the treatment of adults with IBS-C in Japan. In August 2018, the Japanese Ministry of Health, Labor and Welfare approved LINZESS for the treatment of adults with chronic constipation in Japan. In September 2018, Astellas began commercializing LINZESS for the treatment of adult patients with chronic constipation in Japan.

AstraZeneca has rights to develop, manufacture and commercialize linaclotide in China (including Hong Kong and Macau). In January 2019, the Chinese National Medical Products Administration approved the marketing application for LINZESS for adults with IBS-C in China. AstraZeneca began commercializing LINZESS in China in November 2019.

IW-3300

We are also advancing IW-3300, a GC-C agonist, which is in pre-clinical development for the potential treatment of visceral pain conditions, including Interstitial Cystitis / Bladder Pain Syndrome (IC / BPS) and Endometriosis. IC/BPS affects an estimated four to 12 million Americans, according to the Interstitial Cystitis Association. An estimated four million reproductive-age women in the U.S. have diagnosed endometriosis, according to a study published in Gynecologic and Obstetric Investigation in 2017. Both diseases have a limited number of treatment options available.

Collaborations and Partnerships

As part of our GI-focused strategy, we have established development and commercial capabilities that we plan to leverage as we seek to bring multiple medicines to patients. We intend to play an active role in the development and commercialization of our products in the U.S., either independently or with partners that have strong capabilities. We also intend to establish strong global brands by out-licensing development and commercialization rights to our products in other key territories to high-performing partners. We plan to seek collaborations that increase the value of our products by providing meaningful economics and incentives for us and any potential partner. We intend to continue to expand our expertise in GI by accessing innovative externally developed products and to leverage our existing capabilities to develop and commercialize these products in the U.S.

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We have pursued a partnering strategy for commercializing linaclotide that has allowed us to focus our commercialization efforts in the U.S. and enabled partners with strong global capabilities to commercialize linaclotide in territories outside of the U.S.

The following chart shows our revenue for the U.S. and territories outside of the U.S. as a percentage of our total revenue for each of the years ended December 31, 2020, 2019, and 2018.

	Year Ended December 31,
	2020		2019		2018
U.S.	95.8	%	78.0	%	79.0	%
Japan	1.1	%	13.0	%	20.1	%
Rest of world	3.1	%	9.0	%	0.9	%
	100.0	%	100.0	%	100.0	%

Revenue attributable to our linaclotide partnerships comprised substantially all of our revenue for each of the years indicated. Further, we currently derive a significant portion of our revenue from our LINZESS collaboration with AbbVie for the U.S. and believe that the revenues from this collaboration will continue to constitute a significant portion of our total revenue for the foreseeable future. Our revenue from our LINZESS collaboration with AbbVie for the U.S. is highly dependent on the responsiveness of patients to fill prescriptions and other factors such as wholesaler buying patterns. Our collaborative arrangements revenue outside of the U.S. has fluctuated for the years ended December 31, 2020, 2019, and 2018 based on timing of milestone and non-contingent payments. Our collaborative arrangements revenue may continue to fluctuate as a result of the timing and amount of royalties from sales of linaclotide in the markets in which it is currently approved, or any other markets where linaclotide receives approval, as well as clinical and commercial milestones received and recognized under our current and future strategic partnerships outside of the U.S.

Collaboration Agreement for North America with AbbVie

In September 2007, we entered into a collaboration agreement with AbbVie to develop and commercialize linaclotide for the treatment of IBS-C, CIC and other GI conditions in North America. Under the terms of the collaboration agreement, we and AbbVie are jointly and equally funding the development and commercialization of LINZESS in the U.S., with equal share of any profits or losses. Additionally, we granted AbbVie exclusive rights to develop and commercialize linaclotide in Canada and Mexico for which we receive royalties in the mid-teens percent on net sales in those countries. AbbVie is solely responsible for the further development, regulatory approval and commercialization of linaclotide in those countries and funding any costs.

License Agreement with AbbVie (All countries other than the countries and territories of North America, China (including Hong Kong and Macau), and Japan)

In April 2009, we entered into a license agreement with Almirall S.A., or Almirall, or the European License Agreement, to develop and commercialize linaclotide in Europe (including the Commonwealth of Independent States and Turkey) for the treatment of IBS-C, CIC and other GI conditions. In October 2015, Almirall transferred its exclusive license to develop and commercialize linaclotide in Europe to AbbVie. In January 2017, we and AbbVie entered into an amendment to the European License Agreement. The European License Agreement, as amended, extended the license to develop and commercialize linaclotide in all countries other than China (including Hong Kong and Macau), Japan, and the countries and territories of North America. We refer to the additional licensed countries as the Expanded Territory. Under the European License agreement, AbbVie is obligated to pay us (i) certain commercial milestones totaling up to $42.5 million, (ii) royalties based on sales volume in Europe, beginning in the mid-single digits percent and escalating to the upper-teens percent, and (iii) on a country-by-country and product-by-product basis in the Expanded Territory, a royalty as a percentage of net sales of products containing linaclotide as an active ingredient in the upper-single digits for five years following the first commercial sale of a linaclotide product in a country, and in the low-double digits thereafter. The royalty rate for products in the Expanded Territory will decrease, on a country-by-country basis, to the lower-single digits, or cease entirely, following the occurrence of certain events.

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License Agreement for Japan with Astellas

In November 2009, we entered into a license agreement with Astellas to develop and commercialize linaclotide for the treatment of IBS-C, CIC and other GI conditions in Japan. Pursuant to this license agreement, as amended, we were responsible for the supply of linaclotide active pharmaceutical ingredient, or API, to Astellas. On August 1, 2019, we and Astellas amended and restated the license agreement. Under the terms of the amended and restated license agreement, we are no longer responsible for the supply of linaclotide API to Astellas and Astellas is responsible for its own supply of linaclotide API in Japan. Astellas is obligated to pay royalties to us at rates beginning in the mid-single-digits percent and escalating to low-double-digits percent, based on aggregate annual net sales in Japan of products containing linaclotide API.

Collaboration Agreement for China (including Hong Kong and Macau), with AstraZeneca

In October 2012, we entered into a collaboration agreement with AstraZeneca to co-develop and co-commercialize linaclotide in China (including Hong Kong and Macau). In September 2019, we and AstraZeneca amended and restated the collaboration agreement, under which AstraZeneca obtained the exclusive right to develop, manufacture and commercialize products containing linaclotide in the territory. Under the terms of the amended and restated agreement, we transferred all manufacturing responsibilities in China (including Hong Kong and Macau) to AstraZeneca, and we are entitled to receive non-contingent payments totaling $35.0 million in three installments through 2024, of which $10.0 million was received in January 2021. In addition, AstraZeneca may be required to make milestone payments totaling up to $90.0 million contingent on the achievement of certain sales targets and is required to pay tiered royalties to us at rates beginning in the mid-single-digits percent and increasing up to twenty percent based on the aggregate annual net sales of products containing linaclotide in the territory.

Co-Promotion and Other Commercial Agreements

Disease Education and Promotional Agreement with Alnylam

In August 2019, we and Alnylam entered into a disease education and promotional agreement for Alnylam’s GIVLAARI for the treatment of AHP and in December 2020, this agreement was amended. Under the agreement, we received service fees totaling approximately $5.5 million for services rendered from the commencement of the agreement through December 31, 2020 and are eligible to receive royalties based on a percentage of net sales of GIVLAARI that are directly attributable to our promotional efforts over the term of the agreement, which is approximately three years.

Our Strategy

Our vision is to become the leading U.S. GI-focused healthcare company. To achieve this vision, we are dedicated to leveraging our development and commercial expertise to advance the treatment of GI diseases and redefine the standard of care for patients suffering from GI diseases. Our strategy is focused on three core priorities: maximize LINZESS, build our innovative GI pipeline, and deliver sustained profits and generate cash flow. Key elements of our strategy include:

● assembling a team with a singular passion and documented success in creating, developing and commercializing GI medicines that can make a significant difference in patients’ lives;

● successfully and profitably commercializing LINZESS in collaboration with AbbVie in the U.S.;

● exploring development opportunities to enhance the clinical profile of LINZESS by studying linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions;

● leveraging our U.S.-focused commercial capabilities in marketing, reimbursement, patient engagement and sales, as well as advancing a hybrid (virtual and in-person) selling model and technologies such as telehealth, to expand the commercial potential of LINZESS; collaborating with global partners who share our vision, values, culture, and processes to develop and commercialize linaclotide outside of the U.S.;

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● evaluating innovative, externally developed products for in-licensing or acquisition opportunities, prioritizing assets that address serious, organic GI diseases, provide scientific innovation, sound mechanistic rational, a strong clinical safety profile, a clear development path towards commercialization and in disease areas primarily managed by gastroenterologists; and

● executing our strategy with our stockholders’ long-term interests in mind by delivering sustainable profits and long-term per share cash flows.

Competition

Linaclotide competes globally with certain branded and generic prescription therapies and over the counter, or OTC, products for the treatment of IBS-C and CIC, or their associated symptoms.

OTC laxatives make up the majority of the treatments in the U.S. for IBS-C and CIC, according to our internal research. LINZESS accounts for the majority of prescriptions in the U.S. for adults with IBS-C and CIC, according to 2020 data from IQVIA Inc. National Prescription Audit.

Until the launch of LINZESS, the only available branded prescription therapy for IBS-C and CIC in the U.S. was AMITIZA® (lubiprostone), which was approved for the treatment of CIC in 2006, for the treatment of IBS-C in 2008, and for the treatment of opioid induced constipation in 2013. AMITIZA is being commercialized in the U.S. by Takeda Pharmaceuticals Limited. AMITIZA also is being commercialized for the treatment of adults with CIC in certain European countries, including the United Kingdom and Switzerland by Sucampo AG, and for the treatment of chronic constipation in Japan by Mylan N.V., and an authorized generic version of AMITIZA became available in the U.S. in January 2021 and is being commercialized by Endo International plc. TRULANCE® (plecanatide) was approved in the U.S. for the treatment of CIC in adults in January 2017 and for the treatment of IBS-C in adults in January 2018 and is being commercialized in the U.S. by Bausch Health Companies. Shire plc obtained approval of MOTEGRITY™ (prucalopride) in the U.S. for the treatment of CIC in adults in December 2018. In April 2019, US WorldMeds, LLC received approval for the reintroduction of ZELNORM™ (tegaserod) in the U.S. for the treatment of IBS-C in women under the age of 65. In September 2019, Ardelyx, Inc. received approval for ISBRELA™ (tenapanor) in the U.S. for the treatment of IBS-C in adults. ISBRELA is not currently commercially available.

Manufacturing and Supply

It is our objective that the supply of linaclotide be safe and effective, with redundancy built into critical steps of the supply chain, and that each of our collaboration partners are in a position to manage the supply and distribution of linaclotide in their respective territories through a combination of contract manufacturers and in-house manufacturing capabilities. Linaclotide production consists of three phases—manufacture of the API (sometimes referred to as drug substance), manufacture of finished drug product and manufacture of finished goods. We and/or our partners have commercial supply agreements with multiple third-party manufacturers for the production of linaclotide API. We believe the current commercial suppliers have the capabilities to produce linaclotide API in accordance with current good manufacturing practices, or GMP, on a sufficient scale to meet the worldwide development and commercial needs for linaclotide. The commercial suppliers of linaclotide API are subject to routine inspections by regulatory agencies worldwide and also undergo periodic audit and certification by our partners’ or our own quality department.

Each of AbbVie, Astellas and AstraZeneca is responsible for linaclotide API, finished drug product and finished goods manufacturing (including bottling and packaging) and distributing the finished goods to wholesalers in its respective territories.

Prior to linaclotide, there was no precedent for long-term room temperature shelf storage formulation for an orally dosed peptide to be produced in millions of capsules per year. Our efforts to date have led to formulations that are both cost effective and able to meet the stability requirements for commercial pharmaceutical products.

Sales and Marketing

For the foreseeable future, we intend to develop and commercialize our drugs in the U.S. alone or with partners, and expect to rely on partners to develop and commercialize our drugs in territories outside the U.S. In executing our

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strategy, our goal is to retain oversight over the worldwide development and commercialization of our products by playing an active role in their commercialization or finding partners who share our vision, values, culture and processes.

To date, we have established a high-quality commercial organization dedicated to bringing innovative, highly-valued GI healthcare solutions to our customers, including patients, payors, and healthcare providers. Our GI commercial capabilities, including marketing, patient engagement and sales, are designed to support our existing product as well as potential future internally and externally developed products.

We are also coordinating efforts with our linaclotide partners to launch and maintain an integrated, global linaclotide brand. By leveraging the knowledge base and expertise of our experienced commercial team and the insights of each of our linaclotide commercialization partners, we continually improve our collective marketing strategies.

Patents and Proprietary Rights

We actively seek to protect the proprietary technology that we consider important to our business, including pursuing patents that cover our products, compositions, and formulations, their methods of use and the processes for their manufacture, as well as any other relevant inventions and improvements that are commercially important to the development of our business. We also rely on trade secrets that may be important to the development of our business.

Our success will depend significantly on our ability to obtain and maintain patent and other proprietary protection for the technology, inventions and improvements we consider important to our business; defend our patents; preserve the confidentiality of our trade secrets; and operate without infringing the patents and proprietary rights of third parties.

The term of individual patents depends upon the legal term of the patents in the countries in which they are obtained. In most countries in which we file, the patent term is 20 years from the date of filing the non-provisional application. We expect to apply, and have applied, for patent term extension in countries where it is available.

Linaclotide Patent Portfolio

Our linaclotide patent portfolio is currently composed of 14 patents in the U.S., including 12 U.S. patents listed in the U.S. FDA publication, “Approved Drug Products with Therapeutic Equivalence Evaluations”, or the Orange Book, seven granted European patents, most of which have been validated in available European countries, ten granted Japanese patents, five granted Chinese patents, 61 issued patents in other foreign jurisdictions, and numerous pending U.S., foreign and Patent Cooperation Treaty, or PCT, patent applications. We own or jointly own all of the issued patents and pending applications.

The issued U.S. patents, which will expire between 2024 and 2033, contain claims directed to the linaclotide molecule, pharmaceutical compositions thereof, methods of using linaclotide to treat GI disorders, processes for making the molecule, and room temperature stable formulations of linaclotide and methods of use thereof. The 72 mcg, 145 mcg and 290 mcg LINZESS doses are covered by various composition of matter patents in the U.S., the latest of which expires in 2026. In addition, the commercial formulations of the 72 mcg, 145 mcg and 290 mcg LINZESS doses are covered by patents in the U.S. that expire in the early 2030s. The granted European patents, which will expire between 2024 and 2036, some of which are subject to potential patent term extension, contain claims directed to the linaclotide molecule, pharmaceutical compositions thereof, uses of linaclotide to prepare medicaments for treating GI disorders, and room temperature stable formulations of linaclotide and their use in treating IBS-C and chronic constipation. The granted Chinese patents, which will expire between 2024 and 2032, the granted Japanese patents, which will expire between 2025 and 2036, some of which are subject to granted and potential patent term extension, and the granted patents in other foreign jurisdictions, which will expire between 2024 and 2034, some of which may be subject to potential patent term extension, contain claims directed to the linaclotide molecule, pharmaceutical compositions of linaclotide for use in treating GI disorders, and room temperature stable formulations of linaclotide.

We have pending patent applications in certain countries worldwide that, if issued, will expire between 2024 and 2037 and which include claims covering the linaclotide molecule, methods of using linaclotide to treat GI disorders, the current commercial formulations of linaclotide and uses thereof to treat GI disorders.

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The patent term of a patent that covers an U.S. FDA approved drug is also eligible for patent term extension, which permits patent term extension as compensation for some of the patent term lost during the U.S. FDA regulatory review process. The Hatch Waxman Act permits a patent term extension of a single patent applicable to an approved drug for up to five years beyond the expiration of the patent but the extension cannot extend the remaining term of a patent beyond a total of 14 years from the date of product approval by the U.S. FDA. The United States Patent and Trademark Office has issued a Certificate of Patent Term Extension for U.S. Patent 7,304,036, which covers linaclotide and methods of use thereof. As a result, the patent term of this patent was extended to August 30, 2026, 14 years from the date of linaclotide’s approval by the U.S. FDA. Similar provisions are available in Europe and certain other foreign jurisdictions to extend the term of a patent that covers an approved drug. We have received patent term extensions in Japan for several of our linaclotide patents. We have also received patent term extensions, called supplementary protection certificates, for certain linaclotide patents from several national patent offices in Europe.

We and AbbVie received Notice Letters regarding ANDAs submitted to the U.S. FDA by five generic drug manufacturers requesting approval to engage in commercial manufacture, use, sale and offer for sale of linaclotide capsules, proposed generic versions of LINZESS. All five manufacturers requested approval for their 145 mcg and 290 mcg generic doses of LINZESS and two requested additional approval for their 72 mcg generic doses of LINZESS. We and AbbVie have entered into settlement agreements with all five of these generic drug manufacturers providing for licenses to market their 145 mcg and 290 mcg generic versions of LINZESS, beginning as early as March 2029 (subject to U.S. FDA Approval), unless certain limited circumstances, customary for settlement agreements of this nature, occur. In addition, we and AbbVie entered into a settlement agreement providing one generic drug manufacturer a license to market its 72 mcg generic version of LINZESS beginning in August 2030 (subject to U.S. FDA Approval), unless certain limited circumstances, customary for settlement agreements of this nature, occur.

Government Regulation

Our business is subject to government regulation in both the U.S. and in other countries. In the U.S., pharmaceutical products are subject to extensive regulation by the U.S. FDA. The Federal Food, Drug, and Cosmetic Act and other federal and state statutes and regulations, as well as similar foreign regulations, govern, among other things, the research, development, testing, manufacture, storage, recordkeeping, approval, labeling, promotion and marketing, distribution, post-marketing requirements and assessments, post-approval monitoring and reporting, sampling, and import and export of pharmaceutical products. The U.S. FDA and other regulatory authorities have very broad enforcement authority and failure to abide by applicable regulatory requirements can result in administrative or judicial sanctions being imposed on us, including warning letters, refusals of government contracts, clinical holds, civil penalties, injunctions, restitution, disgorgement of profits, recall or seizure of products, total or partial suspension of production or distribution, withdrawal of approval, refusal to approve pending applications, and civil or criminal prosecution.

U.S. FDA Approval Process

No company may market a new drug in the U.S. until it has submitted an NDA to the U.S. FDA, and the U.S. FDA has approved it. The steps required before the U.S. FDA may approve an NDA generally include:

● conducting nonclinical laboratory tests and animal tests in compliance with U.S. FDA’s good laboratory practice, or GLP, requirements;

● development, manufacture and testing of active pharmaceutical product and dosage forms suitable for human use in compliance with current GMP;

● conducting adequate and well-controlled human clinical trials that establish the safety and efficacy of the product for its specific intended use(s);

● in order to evaluate a drug in humans in the U.S., an Investigational New Drug Application, or IND, must be submitted and come into effect before human clinical trials may begin;

● the submission to the U.S. FDA of an NDA;

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● satisfactory completion of one or more U.S. FDA inspections of the manufacturing facility or facilities at which the product, or components thereof, are produced to assess compliance with current GMP requirements and to assure that the facilities, methods and controls are adequate to preserve the product’s identity, strength, quality and purity;

● inspections of other sources of data in the NDA, such as inspection of clinical trial sites to assess compliance with good clinical practice, or GCP, requirements are also generally required; and

● U.S. FDA review and approval of the NDA.

Nonclinical tests include laboratory evaluation of the product candidate, as well as animal studies to assess the potential safety and efficacy of the product candidate. The conduct of the nonclinical tests must comply with federal regulations and requirements including GLP. We must submit the results of the nonclinical tests, together with manufacturing information, analytical data and a proposed clinical trial protocol to the U.S. FDA as part of an IND, which must become effective before we may commence human clinical trials in the U.S. The IND will automatically become effective 30 days after its receipt by the U.S. FDA, unless the U.S. FDA raises concerns or questions before that time about the conduct of the proposed trial. In such a case, we must work with the U.S. FDA to resolve any outstanding concerns before the clinical trial can proceed. We cannot be sure that submission of an IND will result in the U.S. FDA allowing clinical trials to begin, or that, once begun, issues will not arise that will cause us or the U.S. FDA to modify, suspend or terminate such trials. The study protocol and informed consent information for patients in clinical trials must also be submitted to an institutional review board, or IRB, for approval. An IRB may also require the clinical trial at the site to be halted, either temporarily or permanently, for failure to comply with the IRB requirements or if the trial has been associated with unexpected serious harm to subjects. An IRB may also impose other conditions on the trial. For studies conducted outside of the U.S., similarly, we are subject to local regulations which may differ from the U.S. and local regulations must be followed appropriately.

Clinical trials involve the administration of the product candidate to humans under the supervision of qualified investigators, generally physicians not employed by or under the trial sponsor’s control. Clinical trials are typically conducted in three sequential phases, though the phases may overlap or be combined. In Phase I, the initial introduction of the drug into healthy human subjects, the drug is usually tested for safety (adverse effects), dosage tolerance and pharmacologic action, as well as to understand how the drug is taken up by and distributed within the body. Phase II usually involves studies in a limited patient population (individuals with the disease under study) to:

● evaluate preliminarily the efficacy of the drug for specific, targeted conditions;

● determine dosage tolerance and appropriate dosage as well as other important information about how to design larger Phase III trials; and

● identify possible adverse effects and safety risks.

Phase III trials generally further evaluate clinical efficacy and test for safety within an expanded patient population. The conduct of clinical trials is subject to extensive regulation, including compliance with GCP regulations and guidance, and regulations designed to protect the rights and safety of subjects involved in investigations.

The U.S. FDA may order the temporary or permanent discontinuation of a clinical trial at any time or impose other sanctions if it believes that the clinical trial is not being conducted in accordance with U.S. FDA requirements or presents an unacceptable risk to the clinical trial patients. We may also suspend clinical trials at any time on various grounds.

The results of the nonclinical and clinical studies, together with other detailed information, including the manufacture and composition of the product candidate, are submitted to the U.S. FDA in the form of an NDA requesting approval to market the drug. The U.S. FDA approval of the NDA is required before marketing of the product may begin in the U.S. If the NDA contains all pertinent information and data, the U.S. FDA will “file” the application and begin review. The review process, however, may be extended by U.S. FDA requests for additional information, nonclinical or clinical studies, clarification regarding information already provided in the submission, or submission of a risk evaluation and mitigation strategy. The U.S. FDA may refer an application to an advisory committee for review, evaluation and recommendation as to whether the application should be approved. The U.S. FDA is not bound by the

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recommendations of an advisory committee, but it considers such recommendations carefully when making decisions. Before approving an NDA, the U.S. FDA will typically inspect the facilities at which the product candidate is manufactured and will not approve the product candidate unless current GMP compliance is satisfactory. The U.S. FDA also typically inspects facilities responsible for performing animal testing, as well as clinical investigators who participate in clinical trials. The U.S. FDA may refuse to approve an NDA if applicable regulatory criteria are not satisfied or may require additional testing or information. The U.S. FDA may also limit the indications for use and/or require post-marketing testing and surveillance to monitor the safety or efficacy of a product. Once granted, product approvals may be withdrawn if compliance with regulatory standards is not maintained or problems are identified following initial marketing.

The testing and approval process requires substantial time, effort and financial resources, and our product candidates may not be approved on a timely basis, if at all. The time and expense required to perform the clinical testing necessary to obtain U.S. FDA approval for regulated products can frequently exceed the time and expense of the research and development initially required to create the product. The results of nonclinical studies and initial clinical trials of our product candidates are not necessarily predictive of the results from large-scale clinical trials, and clinical trials may be subject to additional costs, delays or modifications due to a number of factors, including difficulty in obtaining enough patients, investigators or product candidate supply. Failure by us or our collaborators, licensors or licensees, including AbbVie, Astellas and AstraZeneca, to obtain, or any delay in obtaining, regulatory approvals or in complying with requirements could adversely affect commercialization and our ability to receive product or royalty revenues.

Hatch-Waxman Act

The Hatch-Waxman Act established abbreviated approval procedures for generic drugs. Approval to market and distribute these drugs is obtained by submitting an ANDA with the U.S. FDA. The application for a generic drug is “abbreviated” because it need not include nonclinical or clinical data to demonstrate safety and effectiveness and may instead rely on the U.S. FDA’s previous finding that the brand drug, or reference drug, is safe and effective. In order to obtain approval of an ANDA, an applicant must, among other things, establish that its product is bioequivalent to an existing approved drug and that it has the same active ingredient(s), strength, dosage form, and route of administration. A generic drug is considered bioequivalent to its reference drug if testing demonstrates that the rate and extent of absorption of the generic drug is not significantly different from the rate and extent of absorption of the reference drug when administered under similar experimental conditions.

The Hatch-Waxman Act also provides incentives by awarding, in certain circumstances, certain legal protections from generic competition. This protection comes in the form of a non-patent exclusivity period, during which the U.S. FDA may not accept, or approve, an application for a generic drug, whether the application for such drug is submitted through an ANDA or a through another form of application, known as a 505(b)(2) application.

The Hatch-Waxman Act grants five years of exclusivity when a company develops and gains NDA approval of a new chemical entity that has not been previously approved by the U.S. FDA. This exclusivity provides that the U.S. FDA may not accept an ANDA or 505(b)(2) application for five years after the date of approval of previously approved drug, or four years in the case of an ANDA or 505(b)(2) application that challenges a patent claiming the reference drug (see discussion below regarding Paragraph IV Certifications). The Hatch‑Waxman Act also provides three years of exclusivity for approved applications for drugs that are not new chemical entities, if the application contains the results of new clinical investigations (other than bioavailability studies) conducted or sponsored by the applicant that were essential to approval of the application. Examples of applications that may require new clinical investigations essential to approval and receive three-year exclusivity include applications for new indications, dosage forms (including new drug delivery systems), strengths, or conditions of use for an already approved product. This three‑year exclusivity period only protects against U.S. FDA approval of ANDAs and 505(b)(2) applications for generic drugs for the conditions of approval (for example, indication or dosage form) that required new clinical investigations that were essential to approval; it does not prohibit the U.S. FDA from accepting or approving ANDAs or 505(b)(2) NDAs for generic drugs that do not include such conditions of approval.

Paragraph IV Certifications. Under the Hatch‑Waxman Act, NDA applicants and NDA holders must provide information about certain patents claiming their drugs, or methods of use of the drug that is the subject of the NDA, for listing in the Orange Book. When an ANDA or 505(b)(2) application is submitted, it must contain one of several possible certifications regarding each of the patents listed in the Orange Book for the reference drug. A certification that

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a listed patent is invalid, unenforceable or will not be infringed by the sale of the proposed product is called a “Paragraph IV” certification. A certification that provides the date a listed patent will expire, but does not challenge the validity, enforceability or infringement of the patent, is called a “Paragraph III” certification. FDA can approve the ANDA or 505(b)(2) application containing the Paragraph III certification upon expiration of the patent.

Within 20 days of the acceptance by the U.S. FDA of an ANDA or 505(b)(2) application containing a Paragraph IV certification, the applicant must notify the NDA holder and patent owner that the application has been submitted, and provide the factual and legal basis for the applicant’s opinion that the patent is invalid, unenforceable, or not infringed. The NDA holder or patent holder may then initiate a patent infringement suit in response to the Paragraph IV notice. If this is done within 45 days of receiving notice of the Paragraph IV certification, a 30‑month stay of the U.S. FDA’s ability to approve the ANDA or 505(b)(2) application is triggered. The U.S. FDA may approve the proposed product before the expiration of the 30‑month stay only if a court finds the patent invalid or not infringed, and the court may shorten or lengthen the 30-month stay under certain limited circumstances.

Patent Term Extension. Under the Hatch‑Waxman Act, a portion of the patent term lost during product development and U.S. FDA review of an NDA or 505(b)(2) application is extended if approval of the application is the first permitted commercial marketing of a drug containing the active ingredient. The patent term extension period is generally one‑half the time between the effective date of the IND and the date of submission of the NDA, plus the time between the date of submission of the NDA and the date of U.S. FDA approval of the product. The maximum period of patent term extension is five years, and the patent cannot be extended to more than 14 years from the date of U.S. FDA approval of the product. Only one unexpired patent claiming the drug product, a method of using the product or a method of manufacturing the product is eligible for extension and the patent holder must apply for extension within 60 days of approval. The U.S. Patent and Trademark Office, in consultation with the U.S. FDA, reviews and approves the application for patent term extension.

Other Regulatory Requirements

After approval, finished drug products are subject to extensive continuing regulation by the U.S. FDA, which include company obligations to manufacture products in accordance with current GMP, maintain and provide to the U.S. FDA updated safety and efficacy information, report adverse experiences with the product, keep certain records and submit periodic reports, obtain U.S. FDA approval of certain manufacturing or labeling changes, and comply with U.S. FDA promotion and advertising requirements and restrictions. Failure to meet these obligations can result in various adverse consequences, both voluntary and U.S. FDA-imposed, including product recalls, withdrawal of approval, restrictions on marketing, and the imposition of civil fines and criminal penalties against the NDA holder. In addition, later discovery of previously unknown safety or efficacy issues may result in restrictions on the product, manufacturer or NDA holder.

We and our partners and any third-party manufacturers we or our partners engage are required to comply with applicable U.S. FDA manufacturing requirements contained in the U.S. FDA’s current GMP regulations. Current GMP regulations require, among other things, quality control and quality assurance as well as the corresponding maintenance of records and documentation. The manufacturing facilities for our products must meet current GMP requirements to the satisfaction of the U.S. FDA pursuant to a pre-approval inspection before we can use them to manufacture our products. We and any third-party manufacturers are also subject to periodic inspections of facilities by the U.S. FDA and other authorities, including procedures and operations used in the testing and manufacture of our products to assess our compliance with applicable regulations.

With respect to post-market product advertising and promotion, the U.S. FDA imposes a number of complex regulations on entities that advertise and promote pharmaceuticals, which include, among others, standards for direct-to-consumer advertising, prohibitions on promoting drugs for uses, conditions or diseases, or in patient populations that are not consistent with the drug’s approved labeling (known as “off-label use”), and principles governing industry-sponsored scientific and educational activities. Failure to comply with U.S. FDA requirements can have negative consequences, including adverse publicity, warning or untitled letters from the U.S. FDA, mandated corrective advertising or communications with doctors or patients, and civil or criminal penalties. Although physicians may prescribe legally available drugs for off-label uses, manufacturers may not market or promote such off-label uses.

Changes to some of the conditions established in an approved application, including changes in indications, labeling, or manufacturing processes or facilities, require submission and U.S. FDA approval of a new NDA or NDA

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supplement before the change can be implemented. An NDA supplement for a new indication typically requires clinical data similar in type and quality to the clinical data supporting the original application for the original indication, and the U.S. FDA uses similar procedures and actions in reviewing such NDA supplements as it does in reviewing NDAs.

Adverse event reporting and submission of periodic reports is required following U.S. FDA approval of an NDA. The U.S. FDA also may require post-marketing testing, known as Phase IV testing, risk evaluation and mitigation strategies, and surveillance to monitor the effects of an approved product or to place conditions on an approval that restrict the distribution or use of the product.

Outside the U.S., our and our collaborators’ abilities to market a product are contingent upon receiving marketing authorization from the appropriate regulatory authorities. The requirements governing the conduct of clinical trials, marketing authorization, pricing and reimbursement vary widely from jurisdiction to jurisdiction. At present, foreign marketing authorizations are applied for at a national level, although within the E.U. registration procedures are available to companies wishing to market a product in more than one E.U. member state. We are subject to U.S. federal and foreign anti-corruption laws. Those laws include the U.S. Foreign Corrupt Practices Act, or FCPA, which prohibits U.S. corporations and their representatives from offering, promising, authorizing, or making payments to any foreign government official, government staff member, political party or political candidate in an attempt to obtain or retain business abroad. The scope of the FCPA encompasses certain healthcare professionals in many countries. We are also subject to similar laws of other countries that have enacted anti-corruption laws and regulations.

Pricing and Reimbursement

Within the U.S., significant uncertainty exists regarding the coverage and reimbursement status of products approved by the U.S. FDA. Sales of our products depend, in part, on the extent to which our products will be covered by third-party payors, such as government health programs, commercial insurance and managed healthcare organizations. The process for determining whether a third-party payor will provide coverage for a finished drug product typically is separate from the process for setting the price of a finished drug product or for establishing the reimbursement rate that the payor will pay for the finished drug product once coverage is approved. Third-party payors may limit coverage to specific finished drug products on an approved list, also known as a formulary, which might not include all of the U.S. FDA-approved drugs for a particular indication. A decision by a third-party payor not to cover our products or to restrict coverage of our products could reduce utilization of our products. Moreover, a third-party payor’s decision to provide coverage for a finished drug product does not imply that an adequate reimbursement rate will be approved. Adequate third-party reimbursement may not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development. Additionally, coverage and reimbursement for finished drug products can differ significantly from payor to payor. One third-party payor’s decision to cover a particular finished drug product or service does not ensure that other payors will also provide coverage for the medical product or service or will provide coverage at an adequate reimbursement rate.

The containment of healthcare costs has become a priority of federal and state governments, and the prices of drugs have been a focus in this effort. Federal and state governments have shown significant interest in implementing cost-containment programs, including restrictions on reimbursement and requirements for substitution of generic products. Adoption of new or enhanced cost-containment measures could limit our net revenue and results. Third party payors are increasingly challenging the prices charged for medical products and services and examining the medical necessity and cost effectiveness of medical products and services, in addition to their safety and efficacy. Restrictions in coverage or decreases in third-party reimbursement for our products could have a material adverse effect on our sales, results of operations and financial condition. We expect that the pharmaceutical industry will experience pricing pressures due to the increasing influence of managed care (and related implementation of managed care strategies to control utilization), additional federal and state legislative and regulatory proposals to regulate pricing of drugs, limit coverage of drugs or reduce reimbursement for drugs, and public scrutiny of drug pricing. While we cannot predict what executive, legislative and regulatory proposals will be adopted or other actions will occur, such events could have a material adverse effect on our business, financial condition and profitability. For additional information relating to pricing and reimbursement, see Item 1A, Risk Factors, elsewhere in this Annual Report on Form 10-K.

Sales and Marketing

The marketing and sale of pharmaceutical products are subject to comprehensive governmental regulation both within and outside the U.S.

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Within the U.S., numerous federal, state and local authorities have jurisdiction over, or enforce laws related to, such activities, including the U.S. FDA, U.S. Drug Enforcement Agency, Centers for Medicare & Medicaid Services, the U.S. Department of Health and Human Services Office of Inspector General, the U.S. Department of Justice, state Attorneys General, state departments of health and state pharmacy boards.

We are subject to the requirements of the Federal Food, Drug, and Cosmetic Act and accompanying regulations that prohibit pharmaceutical companies from promoting a drug prior to approval from the U.S. FDA and from promoting an approved drug in a manner inconsistent with the approved label.

We are also subject to various federal and state laws pertaining to health care “fraud and abuse,” including anti-kickback laws and false claims laws, for activities related to sales of any of our products or product candidates that may in the future receive marketing approval. Anti-kickback laws generally prohibit persons from soliciting, receiving or providing remuneration, directly or indirectly, to induce either the referral of an individual, for an item or service or the purchasing or ordering of a good or service, for which payment may be made under federal healthcare programs such as Medicare and Medicaid. Although the specific provisions of these laws vary, their scope is generally broad and there may not be regulations, guidance or court decisions that apply the laws to particular industry practices. False claims laws prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, information or claims for payment from Medicare, Medicaid, or other third-party payors that are false or fraudulent. Violations of fraud and abuse laws may be punishable by criminal or civil sanctions, including fines and civil monetary penalties, and/or exclusion from federal health care programs (including Medicare and Medicaid).

Laws and regulations have been enacted by the federal government and various states to regulate the sales and marketing practices of pharmaceutical manufacturers with marketed products. The laws and regulations generally limit financial interactions between manufacturers and health care providers and/or require disclosure to the government and public of such interactions. Many of these laws and regulations contain ambiguous requirements or require administrative guidance for implementation.

Our Legacy Business

Separation

On April 1, 2019, we completed the Separation. At the time of the Separation, Cyclerion’s portfolio was comprised of several sGC stimulators, including olinciguat, a vascular sGC stimulator in Phase II development, praliciguat, a systemic sGC stimulator in Phase II development, and IW-6463, a central nervous system-penetrant sGC stimulator in Phase I development. In connection with the Separation, certain assets and liabilities related to the sGC business were transferred to Cyclerion, including various U.S. and foreign patents and Patent Cooperation Treaty patent applications. The Separation and related agreements are more fully described in Note 3, Cyclerion Separation, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Uncontrolled Gout Programs

In June 2016, we closed a transaction with AstraZeneca pursuant to which we received an exclusive license to develop, manufacture, and commercialize in the U.S. products containing lesinurad as an active ingredient, including ZURAMPIC^® and DUZALLO^®. In January 2018, we commenced an initiative to evaluate the optimal mix of investments for our lesinurad franchise for uncontrolled gout, including ZURAMPIC and DUZALLO. As part of this effort, in 2018 we began re-allocating resources within our lesinurad franchise to systematically explore a more comprehensive marketing mix in select test markets (with paired controls), while continuing to build market presence for the lesinurad franchise across the country. In July 2018, we obtained and analyzed the results from the lesinurad franchise test markets. Data from the test markets did not meet expectations. In connection with the results, we determined on July 31, 2018 to terminate the lesinurad license agreement. In August 2018, we delivered to AstraZeneca a notice of termination of the lesinurad license agreement. The post-marketing clinical study to further evaluate the renal and cardiovascular safety of lesinurad was terminated following the termination of the lesinurad license agreement. We requested that the U.S. FDA withdraw approval of the NDA for the Lesinurad Products, and in January 2021, the NDA withdrawal for DUZALLO became effective.

Human Capital

As of January 1, 2021, Ironwood had 232 employees. Of these employees, 42 were on our drug development team, 128 were on our sales and commercial team, and 62 were in general and administrative functions. In connection with our decision to discontinue development of IW-3718, we reduced our workforce by approximately 100 full-time

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employees, which reduction was substantially completed in the fourth quarter of 2020. For information regarding reductions in our workforce during the years ended December 31, 2020, 2019 and 2018, refer to Note 18, Workforce Reduction and Restructuring, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K. We consider our employee relations to be good.

Equity, Diversity, and Inclusion (EDI)

We believe that creating an equitable, diverse, and inclusive culture is critical to attracting, motivating and retaining the talent necessary to deliver on our mission. Approximately 50% of our employees are women, and women represent approximately 30% of our leadership team (vice president and above) and nearly 30% of our board of directors (including our board and audit chairs). Additionally, approximately 20% of our employees are racially or ethnically diverse and, in 2020, approximately 40% of our new hires were racially or ethnically diverse.

In 2020, we established an EDI workgroup dedicated to advancing key EDI initiatives. Ironwood’s leadership team and board of directors champions these efforts. In October 2020, our management adopted a long-term EDI strategy and, in January 2021, our board of directors approved a specific corporate goal for 2021 aimed at fostering an environment where employees feel included and empowered. Current EDI initiatives include empowering our employee resource groups, such as Ironwomen and ISTAR (Ironwood Stands Together Against Racism), introducing new learning and development opportunities, strengthening our talent acquisition strategies, and introducing new metrics and measurements on outreach to diverse candidate sources, retention, career advancement, and employee survey feedback from diverse populations.

Compensation and Benefits

All our employees receive equity and are encouraged to think and act as owners of Ironwood. We strive to provide pay, benefits, and services that are competitive to market and to create incentives to attract, motivate and retain our employees. We are focused on pay equity and regularly monitor our pay practices among similar roles and responsibilities throughout our organization.

Communication and Engagement

We strongly believe that Ironwood’s success depends on employees understanding how their work contributes to Ironwood’s ability to execute on its vision, mission and strategy. Communication and engagement have been especially critical in 2020 in light of challenges brought on by macro events such as the COVID-19 pandemic and the racial injustice in the U.S., as well as internal factors including the recent reduction in our workforce. To this end, we utilize a variety of channels to facilitate open and direct communication, including frequent town hall meetings, Ironwood intranet, CEO blog, leadership engagement opportunities, regular communications regarding business updates, and employee engagement surveys.

Health, Wellness and Safety in the Face of the COVID-19 Pandemic

The health and safety of all our employees is a top priority for us. In 2020, we augmented certain healthcare, childcare and leave benefits in an effort to support our employees and their families in the face of the unique challenges brought on by the COVID-19 pandemic. In addition, we established a working group focused on creating and keeping employees well informed about the company’s latest plans and guidance around COVID-19. We also provided personal protective equipment and safety trainings for field-based employees, a home supply stipend to create home office space, reallocated commuter benefits for home office use, extended additional wellness benefits including backup childcare, and provided our employees with resilience training, among other efforts.

Available Information

You may obtain free copies of our Annual Reports on Form 10-K, Quarterly Reports on Form 10-Q and Current Reports on Form 8-K, and amendments to those reports, as soon as reasonably practicable after they are electronically filed or furnished to the SEC, on the Investors section of our website at www.ironwoodpharma.com or by contacting our Investor Relations department at (617) 374-5082. The contents of our website are not incorporated by reference into this report and you should not consider information provided on our website to be part of this report.

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PART II OTHER INFORMATION

Item 1A. Risk Factors

In addition to the other information in this Annual Report on Form 10-K, any of the factors described below could significantly and negatively affect our business, financial condition, results of operations or prospects. The trading price of our Class A Common Stock may decline due to these risks.

Risks Related to Commercializing LINZESS and Other Product Candidates

We are highly dependent on the commercial success of LINZESS (linaclotide) in the United States, or the U.S., for the foreseeable future; we cannot guarantee that we will generate sufficient revenues from LINZESS to cover our expenses.

We and our partner, AbbVie Inc. (together with its affiliates), or AbbVie, (successor to Allergan plc (together with its affiliates), or Allergan), began selling LINZESS in the U.S. in December 2012. Revenues from our LINZESS collaboration constitute a significant portion of our total revenue, and we believe they will continue to do so for the foreseeable future. The commercial success of LINZESS depends on a number of factors, including:

● the effectiveness of LINZESS as a treatment for adult patients with irritable bowel syndrome with constipation, or IBS-C, or chronic idiopathic constipation, or CIC;

● the size of the treatable patient population;

● the effectiveness of the sales, managed markets and marketing efforts by us and AbbVie, including our ability to adapt our commercial model and market strategy to the evolving landscape;

● the adoption of LINZESS by physicians, which depends on whether physicians view it as safe and effective treatment for adult patients with IBS-C and CIC;

● our success in educating and activating adult IBS-C and CIC patients to enable them to more effectively communicate their symptoms and treatment history to their physicians;

● our ability to both secure and maintain adequate reimbursement for, and optimize patient access to, LINZESS and our ability to demonstrate that LINZESS is safer, more efficacious and/or more cost- effective than alternative therapies;

● the effectiveness of our partners’ distribution networks;

● the occurrence of any side effects, adverse reactions or misuse, or any unfavorable publicity in these or other areas, associated with linaclotide; and

● the development or commercialization of competing products or therapies for the treatment of IBS-C or CIC, or their associated symptoms.

Our revenues from the commercialization of LINZESS are subject to these and other factors, and therefore may be unpredictable from quarter-to-quarter. Revenues from LINZESS or other sources in any quarter may be insufficient to cover our expenses.

Our products may cause undesirable side effects or have other properties that could limit their commercial potential.

Linaclotide has been prescribed to millions of patients since its launch in the U.S. and other territories beginning in December 2012. The most commonly reported adverse reaction since linaclotide became commercially available, as well as in the clinical trials for linaclotide in IBS-C and CIC, has been diarrhea. In the linaclotide Phase III IBS-C and CIC trials, severe diarrhea was reported in 2% or less of the linaclotide-treated patients and its incidence was similar between the IBS-C and CIC populations.

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The number and type of patients treated with linaclotide could continue to grow if physicians prescribe linaclotide to more patients and as we and our partners conduct clinical trials, including in new indications, populations or formulations, as well as explore potential combination products, in existing and new territories. As patient experience increases and expands, we and others may identify previously unknown side effects, known side effects may be found to be more frequent and/or severe than in the past, and we and others may detect unexpected safety signals for our products or any products perceived to be similar to our products. The foregoing, or the perception of the foregoing, may have the following effects, among others:

● sales of our products may be impaired;

● regulatory approvals for our products may be delayed, denied, restricted or withdrawn;

● we or our partners may decide to, or be required to, change the products’ label or send product warning letters or field alerts to physicians, pharmacists and hospitals;

● reformulation of the products, additional nonclinical or clinical studies, changes in labeling or changes to or re- approvals of manufacturing facilities may be required;

● we or our partners may be precluded from pursuing approval of linaclotide in new territories or from studying additional development opportunities to enhance our products’ clinical profiles, including within new or existing indications, populations and formulations, as well as in potential combination products;

● our or our products’ reputation in the marketplace may suffer; and

● government investigations or lawsuits, including class action suits, may be brought against us or our partners.

Any of the above occurrences would harm or prevent sales of our products, increase expenses and impair our and our partners’ ability to successfully commercialize our products.

In addition, the U.S. FDA-approved label for LINZESS contains a boxed warning about its use in pediatric patients. LINZESS is contraindicated in pediatric patients up to six years of age based on nonclinical data from studies in neonatal mice approximately equivalent to human pediatric patients less than two years of age. There is also a warning advising physicians to avoid the use of LINZESS in pediatric patients six to less than 18 years of age. This warning is based on data in young juvenile mice and, at the time of approval, the lack of pediatric clinical safety and efficacy data. We and AbbVie have established a nonclinical and clinical post-marketing plan with the U.S. FDA to understand the safety and efficacy of LINZESS in pediatric patients. These and other restrictions could limit the commercial potential of LINZESS.

We are subject to uncertainty relating to pricing and reimbursement policies in the U.S. which, if not favorable for our products, could hinder or prevent our products’ commercial success.

Our and our partner’s ability to commercialize our products successfully depends in part on the coverage and reimbursement levels set by governmental authorities, private health insurers and other third-party payors. In determining whether to approve reimbursement for our products and at what level, we expect that third-party payors will consider factors that include the efficacy, cost effectiveness and safety of our products, as well as the availability of other treatments including generic prescription drugs and over-the-counter alternatives. Further, in order to obtain and maintain acceptable reimbursement levels and access for patients at copay levels that are reasonable and customary, we have offered, and expect to continue to face increasing pressure to offer, discounts or rebates from list prices or discounts to third-party payors or other unfavorable pricing modifications. Obtaining and maintaining favorable reimbursement can be a time consuming and expensive process, and there is no guarantee that we or AbbVie will be able to negotiate or continue to negotiate pricing terms with third-party payors at levels that are profitable to us, or at all. Certain third-party payors also require prior authorization for, or even refuse to provide, reimbursement for our products, and others may do so in the future. Our business would be materially adversely affected if we and our partners are not able to receive approval for reimbursement of our products from third-party payors on a broad, timely or satisfactory basis; if reimbursement is subject to overly broad or restrictive prior authorization requirements; or if reimbursement is not maintained at satisfactory levels or becomes subject to prior authorization. In addition, our business could be adversely

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affected if government healthcare programs, private health insurers, including managed care organizations, or other reimbursing bodies or payors limit or reduce the indications for or conditions under which our products may be reimbursed. Moreover, as discussed further below, changes in insurance coverage or reimbursement levels by governmental authorities, private health insurers and other third-party payors, or in the type of such coverage held by patients, as well as the impacts to healthcare access or administration (including, for example, limitations on medications or procedures deemed “non-essential,” reduced interaction between patients and physicians, and increased unemployment), due to the COVID-19 pandemic may materially harm our business and commercialization efforts.

We expect to experience pricing pressures in connection with the sale of our current and future products due to the healthcare reforms discussed below, as well as the trend toward initiatives aimed at reducing healthcare costs, the increasing influence of managed care, the scrutiny of pharmaceutical pricing, the ongoing debates on reducing government spending and additional legislative proposals. There has been significant scrutiny of pharmaceutical pricing and the resulting costs of pharmaceutical products that could cause significant operational and reimbursement changes for the pharmaceutical industry. There have been a number of federal and state efforts to address drug costs, which generally have focused on increasing transparency around drug costs or limiting drug prices, price increases or other related costs. For example, the Bipartisan Budget Act of 2018 contained various provisions that affect coverage and reimbursement of drugs, including an increase, which began in 2019, in the discount that manufacturers of Medicare Part D brand name drugs must provide to Medicare Part D beneficiaries during the coverage gap from 50% to 70%.

Healthcare reform efforts or any future legislation or regulatory actions aimed at controlling and reducing healthcare costs, including through measures designed to limit reimbursement, restrict access or impose unfavorable pricing modifications on pharmaceutical products, could impact our and our partners’ ability to obtain or maintain reimbursement for our products at satisfactory levels, or at all, which could materially harm our business and financial results.

We and our linaclotide partners are subject to uncertainty relating to pricing and reimbursement policies outside the U.S., as well as risks relating to the improper importation of linaclotide and sale of counterfeit versions of linaclotide. If such policies are not favorable, or if linaclotide is improperly imported or is counterfeited, our business and financial results could be adversely affected.

In some foreign countries, particularly Canada, the countries of Europe, Japan and China, the pricing and payment of prescription pharmaceuticals is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take six to 12 months or longer after the receipt of regulatory approval and product launch. Reimbursement sources are different in each country, and each country may include a combination of distinct potential payors, including private insurance and governmental payors. Some countries may restrict the range of medicinal products for which their national health insurance systems provide reimbursement and control the prices of medicinal products for human use. To obtain favorable reimbursement for the indications sought or pricing approval in some countries, we and our partners may be required to conduct a clinical trial that compares the cost and clinical effectiveness of linaclotide to other available therapies. In addition, in countries in which linaclotide is the only approved therapy for a particular indication, such as CONSTELLA as the only prescription product approved for the symptomatic treatment of moderate to severe IBS-C in adults in Europe and LINZESS as the only prescription treatment approved for the treatment of adults with IBS-C in Japan, there may be disagreement as to what the most comparable product is, or if there even is one. Further, several countries have implemented government measures to either freeze or reduce pricing of pharmaceutical products. Many third-party payors and governmental authorities also consider the price for which the same product is being sold in other countries to determine their own pricing and reimbursement strategy, so if linaclotide is priced low or gets limited reimbursement in a particular country, this could result in similarly low pricing and reimbursement in other countries. If reimbursement for linaclotide is unavailable in any country in which reimbursement is sought, limited in scope or amount, or if pricing is set at or reduced to unsatisfactory levels, our and our partners’ ability to successfully commercialize linaclotide in such country would be impacted negatively. Furthermore, if these measures prevent us or any of our partners from selling linaclotide on a profitable basis in a particular country, they could prevent the commercial launch or continued sale of linaclotide in that country.

CONSTELLA was first launched in certain European countries for the symptomatic treatment of moderate to severe IBS-C in adults in the second quarter of 2013 and our partner, AbbVie, is currently commercializing CONSTELLA in a number of European countries, including the United Kingdom, Italy and Spain. LINZESS was first launched in Japan for the treatment of IBS-C in adults in the first quarter of 2017, and for the treatment of chronic constipation in adults in the third quarter of 2018, and our partner Astellas is currently commercializing LINZESS in Japan. In addition, LINZESS was first launched in China for the treatment of IBS-C in adults in November 2019, and

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our partner AstraZeneca is currently commercializing LINZESS in China (including Hong Kong and Macau). The pricing and reimbursement strategy is a key component of our partners’ commercialization plans for CONSTELLA in Europe and LINZESS in Japan and China. Our revenues may suffer if our partners are unable to successfully and timely conclude reimbursement, price approval or funding processes and market CONSTELLA in key member states of the E.U. or LINZESS in Japan or China, or if coverage and reimbursement for either CONSTELLA or LINZESS is limited or reduced. If our partners are not able to obtain or maintain coverage, pricing or reimbursement on acceptable terms or at all, or if such terms change in any countries in its territory, our partners may not be able to, or may decide not to, sell either CONSTELLA or LINZESS in such countries.

We and our partners also face the risk that linaclotide is imported or reimported into markets with relatively higher prices from markets with relatively lower prices, which would result in a decrease of sales and any payments we receive from the affected market. Additionally, third parties may illegally produce, distribute and/or sell counterfeit or otherwise unfit or adulterated versions of linaclotide. In either case, we and our partners may not be able to detect or, if detected, prevent or prohibit the sale of such products, which could result in dangerous health consequences for patients, loss of confidence in us, our partners and our products, and adverse regulatory or legal consequences. Any of the foregoing or other consequences could adversely impact our reputation, financial results and business.

We must work effectively and collaboratively with AbbVie to market and sell LINZESS in the U.S., and must adapt our commercial model and market strategy to the evolving landscape, for LINZESS to achieve its maximum commercial potential.

We are working closely with AbbVie to execute our joint commercialization plan for LINZESS. The commercialization plan includes an agreed upon marketing campaign that targets the physicians who see patients who could benefit from LINZESS treatment. Our marketing campaign also targets the adult men and women who suffer from IBS-C or CIC. Our commercialization plan also includes an integrated call plan for our sales forces in an effort to optimize the education of specific gastroenterologists and primary care physicians on whom our and AbbVie’s sales representatives call, and the frequency with which the representatives meet with them. In addition, we are advancing a hybrid (virtual and in-person) selling model and access to technologies such as telehealth in an effort to expand the commercial potential of LINZESS and our other product candidates in the U.S.

In order to optimize the commercial potential of LINZESS, we and AbbVie must execute upon this commercialization plan effectively and efficiently. In addition, we and AbbVie must continually assess, modify and adapt our commercialization plan in a coordinated and integrated fashion, including evaluating and adjusting as necessary the level and mix of marketing and promotion efforts, in response to changing business, market or other factors in order to advance the commercial potential of LINZESS. For example, the increase in virtual customer support and limitations on customer access by our customer-facing employees that was prompted by the COVID-19 pandemic contributed to our decision to make virtual promotion a more permanent component of our overall selling model and may further change our commercial model or the market strategy in the industry. Further, we and AbbVie must continue to focus and refine our marketing campaign to ensure a clear and understandable physician-patient dialogue around IBS-C, CIC and the potential for LINZESS as an appropriate therapy. In addition, we and AbbVie must provide our sales forces with the highest quality support, guidance and oversight for them to continue to effectively promote LINZESS to gastroenterologists and primary care physicians. If we and AbbVie fail to evolve with the changing commercial landscape successfully and perform these commercial functions in the highest quality manner and in accordance with our joint commercialization plan and related agreements, LINZESS will not achieve its maximum commercial potential and we may suffer financial harm. Our efforts to further target and engage adult patients with IBS-C or CIC may not effectively increase appropriate patient awareness or patient/physician dialogue and may not increase the revenues that we generate from LINZESS.

In addition, most of our customer-facing employees are engaged in in-person work practices; however, they are limited in the number of in-person details they are able to conduct due to containment and mitigation measures related to the COVID-19 pandemic. We monitor the impact of the COVID-19 pandemic in the territories where our customer-facing employees are engaged in in-person work practices, and in some cases, we have paused the in-person work practices as a result of the impact of the COVID-19 pandemic in those territories, and may do so again in the future. Customer-facing employees who are not providing in-person services continue to support their customers virtually through telephone and web-based technologies. Headquarters employees are expected to have the option to work remotely through mid-2021. We may delay, stop or otherwise limit in-person work in the future pending relevant health authority guidance and other safety considerations. The virtual support we continue to provide to customers may not be

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as effective as in-person efforts, and our in-person efforts may be limited and/or limited in their effectiveness. If this were to occur, or if we, AbbVie or any of our partners were unable to align on our strategy and development and commercial efforts as a result of the COVID-19 pandemic or otherwise, we may not be able to maintain or increase the revenues that we generate or our business may be otherwise materially harmed.

We face competition and new products may emerge that provide different or better alternatives for treatment of the conditions that our products are approved to treat.

The pharmaceutical industry and the markets in which we operate are intensely competitive. We compete in the marketing and sale of our products, the development of new products and the acquisition of rights to new products with commercial potential. Certain of our competitors have substantially greater financial, technical and human resources than us. Mergers and acquisitions in the pharmaceutical industry may result in even more resources being concentrated in our competitors and enable them to compete more effectively. Competition may also increase further as a result of advances made in the commercial applicability of technologies and greater availability of capital for investment in these fields. Additionally, new developments, including the development of other drug technologies and methods of preventing the incidence of disease, occur in the pharmaceutical and medical technology industries at a rapid pace. These developments may render our products obsolete or noncompetitive.

Linaclotide competes with certain prescription therapies and over-the-counter products, including with products that have attained significant levels of market acceptance. The availability of prescription competitors and over-the- counter products could limit the demand, and the price we are able to charge, for LINZESS unless we are able to achieve and maintain market acceptance among the medical community and patients and differentiate LINZESS on the basis of its cost and/or actual or perceived benefits. For example, Takeda’s AMITIZA (lubiprostone) is approved by the U.S. FDA for sale in the U.S. for the treatment of IBS-C, CIC and opioid-induced constipation, and an authorized generic version of AMITIZA became available in the U.S. in January 2021 and is being commercialized by Endo International plc; Bausch Health’s TRULANCE (plecanatide) is approved by the U.S. FDA for sale in the U.S. for the treatment of adults with IBS-C and CIC; Takeda’s MOTEGRITY (prucalopride) is approved by the U.S. FDA for sale in the U.S. for the treatment of CIC in adults; and Alfasigma USA’s ZELNORM (tegaserod) is approved for sale in the U.S. for treatment of IBS-C in women under the age of 65. Over-the-counter laxatives such as MiraLAX® and DULCOLAX®, and lactulose, a prescription laxative treatment, are also available for the treatment of constipation. Additionally, we believe other companies are developing products which could compete with linaclotide, should they be approved by the U.S. FDA or foreign regulatory authorities and become commercially available. For example, although not currently commercially available, the U.S. FDA approved Ardelyx, Inc.’s IBSRELA™ (tenapanor) for the treatment of IBS-C in adults. In addition, there are other compounds in late-stage development and other potential competitors that are in earlier stages of development that, if approved, may compete with linaclotide. If our current or potential competitors are successful in completing drug development for their drug candidates and obtain approval from the U.S. FDA or foreign regulatory authorities, they could limit the demand for linaclotide.

Even though LINZESS is approved by the U.S. FDA for use in adult patients, post-approval development and regulatory requirements still remain, which present additional challenges.

In August 2012, the U.S. FDA approved LINZESS as a once-daily treatment for adult men and women suffering from IBS-C or CIC. Although we and AbbVie completed additional nonclinical and clinical studies in adults that were required by the U.S. FDA in connection with the approval of LINZESS, LINZESS remains subject to ongoing

U.S. FDA requirements, including those governing the testing, manufacturing, labeling, packaging, storage, advertising, promotion, sale, distribution, recordkeeping and submission of safety and other post-market information.

LINZESS is contraindicated in pediatric patients up to six years of age based on nonclinical data from studies in neonatal mice approximately equivalent to human pediatric patients less than two years of age. There is also a boxed warning advising physicians to avoid the use of LINZESS in pediatric patients six to less than 18 years of age. This warning is based on data in young juvenile mice and, at the time of approval, the lack of pediatric clinical safety and efficacy data. We and AbbVie have established a nonclinical and clinical post-marketing plan with the U.S. FDA to understand the safety and efficacy of LINZESS in pediatric patients, and clinical pediatric programs in IBS-C and functional constipation are ongoing. Our ability to expand the indication or label information for LINZESS to pediatrics will depend on, among other things, our successful completion of pediatric clinical programs. In addition, as the holder of the approved NDA for ZURAMPIC, we are obligated to monitor and report adverse events and any failure of

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ZURAMPIC to meet the specifications in the NDA, to submit new or supplemental applications and to obtain U.S. FDA approval for certain changes, including changes to product labeling and manufacturing processes.

These post-approval requirements impose burdens and costs on us. Failure to effectively, appropriately and timely conduct and complete the required studies relating to our products, monitor and report adverse events and meet our other post-approval commitments would lead to negative regulatory action at the U.S. FDA, which could include withdrawal of regulatory approval of our products for their currently approved indications and patient populations.

Manufacturers of drug products and their facilities are subject to continual review and periodic inspections by the U.S. FDA and other regulatory authorities for compliance with GMP and other applicable regulations. If we or a regulatory agency discovers previously unknown problems with a product, such as adverse events of unanticipated severity or frequency, or problems with a facility where the product is manufactured, a regulatory agency may impose restrictions on that product or the manufacturer, including withdrawal of the product from the market or suspension of manufacturing. If we, our partners or the manufacturing facilities for our products fail to comply with applicable regulatory requirements, a regulatory agency may take the following actions, among others:

● issue warning letters or untitled letters;

● impose civil or criminal penalties;

● suspend or withdraw regulatory approval;

● suspend any ongoing clinical trials;

● refuse to approve pending applications or supplements to applications submitted by us or our partners;

● impose restrictions on operations, including costly new manufacturing requirements; or

● seize or detain products or require us to initiate a product recall.

Even though linaclotide is approved for marketing in the U.S. and in a number of other countries, we or our partners may never receive approval to commercialize linaclotide in additional parts of the world.

In order to market any products outside of the countries where linaclotide is currently approved, we or our partners must comply with numerous and varying regulatory requirements of other jurisdictions regarding, among other things, safety and efficacy. Approval procedures vary among jurisdictions and can involve product testing and administrative review periods different from, and greater than, those in the U.S. and the other countries where linaclotide is approved. Potential risks include that the regulatory authorities:

● may not deem linaclotide safe and effective;

● may not find the data from nonclinical studies and clinical trials sufficient to support approval;

● may not approve of manufacturing processes and facilities;

● may not approve linaclotide for any or all indications or patient populations for which approval is sought;

● may require significant warnings or restrictions on use to the product label for linaclotide; or

● may change their approval policies or adopt new regulations.

If any of the foregoing were to occur, our receipt of regulatory approval in the applicable jurisdiction could be delayed or we may never receive approval at all. Additionally, we cannot be certain of the duration or extent to which the COVID-19 pandemic may impact operations of regulatory authorities in jurisdictions around the world, and any reduction in resources dedicated to review and approval of products in applicable jurisdictions could delay or otherwise impact approval or other regulatory decisions or actions. Further, regulatory approval in one jurisdiction does not ensure regulatory approval in another, but a failure or delay in obtaining regulatory approval in one jurisdiction may have a

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negative effect on the regulatory processes in others. If linaclotide is not approved for all indications or patient populations or with the label requested, this would limit the uses of linaclotide and have an adverse effect on its commercial potential or require costly post-marketing studies.

Risks Related to Our Growth Strategy

If we are unable to execute on our strategy to in-license or acquire externally developed products or product candidates, or engage in other transactions with value creation potential, our business and prospects would be materially adversely affected.

Our future success is largely dependent on our ability to successfully execute on our growth strategy, which includes in-licensing or otherwise acquiring the rights to externally developed gastrointestinal products or product candidates or engaging in other transactions with value creation potential. The success of this strategy depends upon our ability to identify, select and acquire promising assets, platforms or other opportunities. The process of proposing, negotiating and implementing a license or acquisition is lengthy and complex. Pursuit of external opportunities is also a highly competitive area and a number of other companies, including some with substantially greater financial, development, marketing and sales resources, may compete with us for license or acquisition opportunities. We have limited resources to identify and execute the acquisition or in-licensing of third-party products, product candidates, businesses or technologies and integrate them into our current infrastructure. Moreover, we expect to incur a variety of costs and devote resources to potential acquisitions or in-licensing opportunities that are never completed, or we may fail to realize the anticipated benefits of such efforts. If we are unable to successfully acquire the rights to additional products or product candidates on terms that we find acceptable, or at all, or execute other value creating transactions, we will remain smaller, less diversified and highly dependent on the commercial success of LINZESS, and our business and prospects would be materially and adversely affected.

In addition, such in-licenses, acquisitions or other transactions may entail numerous operational and financial risks, including:

● development, regulatory and commercialization challenges;

● exposure to unknown liabilities;

● disruption of our business and diversion of our management’s time and attention to develop acquired products, product candidates, businesses or technologies;

● incurrence of substantial debt, dilutive issuances of securities or depletion of cash to pay for acquisitions;

● higher than expected acquisition and integration costs;

● difficulty in combining the operations and personnel of any acquired businesses with our operations and personnel;

● increased amortization expenses;

● impairment of relationships with key suppliers or customers of any acquired businesses due to changes in management and ownership; and

● inability to motivate key employees of any acquired businesses.

The development of product candidates in particular is a highly uncertain process, as we discuss further below. Any product candidate that we in-license or acquire may require additional development efforts prior to commercial sale, including extensive clinical testing and approval by the U.S. FDA and applicable foreign regulatory authorities. All product candidates are prone to risks of failure typical of pharmaceutical product development, including the possibility that a product candidate will not be shown to be sufficiently safe and effective for approval by regulatory authorities or competitors may develop alternatives that render our potential product candidates obsolete or less attractive. It is possible that none of the product candidates we may in-license or acquire will be approved for commercial sale or be otherwise commercially viable, which would impair our ability to grow. Furthermore, we may have little or no insight or control over the development and commercialization of any product that we in-license outside the licensed territory. If

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other licensees do not effectively develop or commercialize any such product outside the licensed territory, our reputation or the reputation of any such product may be impacted.

Our failure to successfully develop and commercialize additional product candidates or approved products would impair our ability to grow and/or adversely affect our business.

As part of our growth strategy, we intend to explore further linaclotide development opportunities. We and AbbVie are exploring development opportunities to enhance the clinical profile of LINZESS by studying linaclotide in new or existing indications, populations and formulations to assess its potential to treat various conditions. These development efforts may fail or may not increase the revenues that we generate from LINZESS. Furthermore, they may result in adverse events, or perceived adverse events, in certain patient populations that are then attributed to the currently approved patient population, which may result in adverse regulatory action at the U.S. FDA or in other

countries or harm linaclotide’s reputation in the marketplace, each of which could materially harm our revenues from linaclotide.

The strength of our company’s pipeline will depend in large part on the outcomes of studies of assets in our pipeline. We may spend several years and make significant investments in developing any current or future product candidate, and failure may occur at any point. Our product candidates must satisfy rigorous standards of safety and efficacy before they can be approved for sale by the U.S. FDA. To satisfy these standards, we must allocate resources among development programs and we must engage in costly and lengthy research and development efforts, which are subject to unanticipated delays and other significant uncertainties. Despite our efforts, our product candidates may not offer therapeutic or other improvement over existing competitive drugs, be proven safe and effective in clinical trials, or meet applicable regulatory standards. It is possible that none of the product candidates we develop will be approved for commercial sale, which would impair our ability to grow.

We have ongoing or planned nonclinical and clinical trials, including for linaclotide. Many companies in the pharmaceutical industry have suffered significant setbacks in clinical trials even after achieving promising results in earlier nonclinical or clinical trials. For example, in May 2020, we and AbbVie announced that our Phase II trial evaluating MD-7246, a delayed release formulation of linaclotide in adult patients with abdominal pain associated with irritable bowel syndrome with diarrhea, did not meet its primary or key secondary endpoints. Based on these findings, we and AbbVie have discontinued development of MD-7246. In addition, in September 2020, we announced that one of our two identical Phase III trials evaluating IW-3718 in refractory GERD did not meet the pre-specified criteria associated with a planned early efficacy assessment. Following the assessment from an independent data monitoring committee, we unblinded the data and confirmed that IW-3718-302 did not meet the criteria, including the study’s primary endpoint of achieving a statistically significant improvement in heartburn severity. Based on these findings, we are discontinuing development of IW-3718.

The findings from our completed nonclinical studies may not be replicated in later clinical trials, and our clinical trials may not be predictive of the results we may obtain in later-stage clinical trials or of the likelihood of regulatory approval. Results from our clinical trials and findings from our nonclinical studies could lead to abrupt changes in our development activities, including the possible limitation or cessation of development activities associated with a particular product candidate or program. Furthermore, our analysis of data obtained from nonclinical and clinical activities is subject to confirmation and interpretation by the U.S. FDA and other applicable regulatory authorities, which could delay, limit or prevent regulatory approval. The U.S. FDA or other regulatory authorities also may require additional clinical trials, which may be costly or delay, limit, prevent or otherwise impact regulatory submission or approval. Satisfaction of U.S. FDA or other applicable regulatory requirements is costly, time-consuming, uncertain and subject to unanticipated delays.

If we are unable to successfully partner with other companies to develop and commercialize products and/or product candidates, our ability to grow would be impaired and our business would be adversely affected.

As part of our business strategy, we may partner with pharmaceutical, biotechnology or other companies to develop and commercialize products or product candidates. Although we have entered into such arrangements with respect to the development and commercialization of linaclotide worldwide, there can be no assurance that we will be able to do so in the future with respect to other products or product candidates that we either develop internally or in- license or that we will be able to gain the interest of potential partners; establish and maintain development, manufacturing, marketing, sales or distribution relationships on acceptable terms; that such relationships, if established,

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will be successful or on favorable terms; or that we will gain market acceptance for such products or product candidates. The process of proposing, negotiating and implementing a partnership arrangement is lengthy and complex. If we enter into any partnering arrangements with third parties, any revenues we receive will depend upon the efforts of such third parties. If we are unable to establish successful partnering arrangements, we may not gain access to the financial resources and industry experience necessary to develop, commercialize or successfully market our products or product candidates, may be forced to curtail, delay or stop a development program or one or more of our other development programs, delay commercialization, reduce the scope of our planned sales or marketing activities or undertake development or commercialization activities at our own expense, and therefore may be unable to generate revenue from products or product candidates or do so to their full potential.

Delays in the completion of clinical testing of any of our products or product candidates could result in increased costs and delay or limit our ability to generate revenues.

Delays in the completion of clinical testing could significantly affect our product development costs. We do not know whether planned clinical trials will be completed on schedule, if at all. The commencement and completion of clinical trials can be delayed for a number of reasons, including delays related to:

● the ongoing COVID-19 pandemic, including restrictions on activities imposed by government authorities in response;

● obtaining regulatory approval to commence a clinical trial;

● reaching agreement on acceptable terms with prospective CROs and trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

● manufacturing sufficient quantities of a product candidate for use in clinical trials;

● obtaining institutional review board approval to conduct a clinical trial at a prospective site;

● recruiting and enrolling patients to participate in clinical trials for a variety of reasons, including competition from other clinical trial programs for the treatment of similar conditions; and

● maintaining patients who have initiated a clinical trial but may be prone to withdraw due to side effects from the therapy, lack of efficacy or personal issues, or who are lost to further follow-up.

The COVID-19 pandemic has impacted enrollment in our clinical trials and may impact clinical trial enrollment or participation in the future, for example due to suspension of in-person procedures required for enrollment or lower or discontinued patient participation compared to pre-COVID-19 pandemic levels. Specifically, prior to our decision to discontinue development of IW-3718, the COVID-19 pandemic impacted enrollment in our Phase III clinical trials of IW-3718 for the treatment of refractory GERD. Clinical trials may also be delayed or discontinued as a result of ambiguous or negative interim results or assessments. In addition, a clinical trial may be suspended or terminated by us, an institutional review board overseeing the clinical trial at a clinical trial site (with respect to that site), the U.S. FDA, or other regulatory authorities due to a number of factors, including:

● failure to conduct the clinical trial in accordance with regulatory requirements or the study protocols;

● inspection of the clinical trial operations or trial sites by the U.S. FDA or other regulatory authorities resulting in the imposition of a clinical hold;

● unforeseen safety issues; or

● lack of adequate enrollment or funding to continue the clinical trial.

Additionally, changes in regulatory requirements and guidance may occur, and we may need or otherwise determine to amend clinical trial protocols to reflect these changes. Each protocol amendment would require institutional review board review and approval, which may adversely impact the costs, timing or successful completion of the associated clinical trials. If we or our partners terminate or experience delays in the completion of any clinical trials, the

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commercial prospects for our products or product candidates may be harmed, and our ability to generate product revenues will be delayed. In addition, many of the factors that cause, or lead to, a delay in the commencement or completion of clinical trials may also ultimately lead to the denial of regulatory approval.

Risks Related to Our Dependence on Third Parties

Because we work with partners to develop, manufacture and commercialize linaclotide, we are dependent upon third parties, and our and our partners’ relationships with those third parties, in our and our partners’ efforts to obtain regulatory approval for, and to commercialize, linaclotide, as well as to comply with regulatory and other obligations with respect to linaclotide.

AbbVie played a significant role in the conduct of the clinical trials for linaclotide and in the subsequent collection and analysis of data, and AbbVie holds the new drug application, or NDA, for LINZESS. In addition, we are commercializing LINZESS in the U.S. with AbbVie. AbbVie is also responsible for the development, regulatory approval and commercialization of linaclotide in countries worldwide other than Japan and China (including Hong Kong and Macau). AbbVie is commercializing LINZESS in Mexico and CONSTELLA in Canada, as well as commercializing CONSTELLA in certain countries in Europe. Astellas and AstraZeneca are responsible for development and commercialization of LINZESS in Japan and China (including Hong Kong and Macau), respectively. Each of our partners for linaclotide also is responsible for active pharmaceutical ingredient, or API, finished drug product and finished goods manufacturing (including bottling and packaging) for its respective territories and distributing the finished goods to wholesalers. We and/or our partners have commercial supply agreements with independent third parties to manufacture the linaclotide API.

The integration of our efforts with our partners’ efforts is subject to the uncertainty of the markets for pharmaceutical products in each partner’s respective territories, and accordingly, these relationships must evolve to meet any new challenges, including those arising out of the COVID-19 pandemic, that arise in those regions. These integrated functions may not be carried out effectively and efficiently if we fail to communicate and coordinate with our linaclotide partners, and vice versa. Our linaclotide partnering strategy imposes obligations, risks and operational requirements on us as the central node in our global network of partners. If we do not effectively communicate with each partner and ensure that the entire network is making integrated and cohesive decisions focused on the global brand for linaclotide, linaclotide will not achieve its maximum commercial potential. Further, we have limited ability to control the amount or timing of resources that our partners devote to linaclotide, particularly in light of the impact of the COVID-19 pandemic on our partners’ operations. If any of our partners fails to devote sufficient time and resources to linaclotide, or if its performance is substandard or otherwise hindered, it will delay the potential submission or approval of regulatory applications for linaclotide, as well as the manufacturing and commercialization of linaclotide in the particular territory. A material breach by any of our partners of our collaboration or license agreement with such partner, or a significant disagreement between us and a partner, could also delay the regulatory approval and commercialization of linaclotide, potentially lead to costly litigation, and could have a material adverse impact on our financial condition. Moreover, although we have non-compete restrictions in place with each of our linaclotide partners, they may have competitive products or relationships with other commercial entities, some of which may compete with us. If any of our partners competes with us or assists our competitors, it could harm our competitive position.

In addition, adverse event reporting requires significant coordination with our partners and third parties. We are the holder of the global safety database for linaclotide responsible for coordinating the safety surveillance and adverse event reporting efforts worldwide with respect to linaclotide, and each of Astellas, AstraZeneca and AbbVie is responsible for reporting adverse event information from its territory to us. An AstraZeneca partner is the holder of the global safety database for lesinurad and is responsible for coordinating the safety surveillance and adverse event reporting efforts worldwide with respect to lesinurad. If we or AstraZeneca’s partner fails to perform such activities and maintain each safety database or if such parties do not report adverse events related to such products, or fail to do so in a timely manner, we may not receive the information that we or our partners are required to report to the U.S. FDA or a foreign regulatory authority regarding such products. Furthermore, we or such parties may fail to adequately monitor, identify or investigate adverse events, or to report adverse events to the U.S. FDA or foreign regulatory authority accurately and within the prescribed timeframe. If we or such parties are unsuccessful in any of the foregoing due to poor process, execution, systems, oversight, communication, adjudication or otherwise, then we may suffer any number of consequences, including the imposition of additional restrictions on the use of such products, removal of such products from the market, criminal prosecution, the imposition of civil monetary penalties, seizure of such products, or delay in approval of future products.

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We rely entirely on contract manufacturers, our partners and other third parties to manufacture linaclotide and our other product candidates and distribute linaclotide. If they are unable to comply with applicable regulatory requirements, unable to source sufficient raw materials, experience manufacturing or distribution difficulties, or are otherwise unable to manufacture and distribute sufficient quantities to meet demand, our development and commercialization efforts may be materially harmed.

We have no internal manufacturing or distribution capabilities. Instead, we rely on a combination of contract manufacturers and our partners to manufacture API, finished drug product and finished goods for linaclotide and our other product candidates. Each of our partners for linaclotide is responsible for API, finished drug product and finished goods manufacturing (including bottling and packaging) for its respective territories and distributing the finished goods to wholesalers. Should we, or any of our partners or any third-party manufacturers we or our partners engage, experience setbacks or challenges in our manufacturing efforts, including setbacks related to the COVID-19 pandemic described further below, our development and commercialization efforts may be materially harmed. We and/or our partners have commercial supply agreements with independent third parties to manufacture linaclotide API.

Each of our partners and the third-party manufacturers we or our partners engage must comply with current good manufacturing practices, or GMP, and other stringent regulatory requirements enforced by the U.S. FDA and foreign regulatory authorities in other jurisdictions. These requirements include, among other things, quality control, quality assurance and the maintenance of records and documentation, which occur in addition to our and our partners’ own quality assurance releases. Manufacturers of our products may be unable to comply with these GMP requirements and with other regulatory requirements. We have little control over compliance with these regulations and standards by our partners and the third-party manufacturers we or our partners engage.

Our partners and the third-party manufacturers we or our partners engage may experience problems with their respective manufacturing and distribution operations and processes, including, for example, quality issues, such as product specification and stability failures, procedural deviations, improper equipment installation or operation, utility failures, contamination, natural disasters and public health epidemics, including the COVID-19 pandemic. In addition, the raw materials necessary to make API for our products and product candidates are acquired from a limited number of sources. Any delay or disruption in the availability of raw materials or a change in raw material suppliers could result in production disruptions, delays or higher costs with consequent adverse effects on us.

The manufacture of pharmaceutical products requires significant expertise and capital investment, including the development of advanced manufacturing techniques and process controls. Manufacturers of pharmaceutical products often encounter difficulties in commercial production. These problems include difficulties with production costs and yields, quality control, including stability of the product and quality assurance testing, and shortages of qualified personnel, as well as compliance with federal, state and foreign regulations and the challenges associated with complex supply chain management. Even if our partners or the third-party manufacturers we or our partners engage do not experience problems and commercial manufacturing is achieved, their maximum or available manufacturing capacities may be insufficient to meet commercial demand. Finding alternative manufacturers or adding additional manufacturers requires a significant amount of time and involves significant expense. New manufacturers would need to develop and implement the necessary production techniques and processes, which along with their facilities, would need to be inspected and approved by the regulatory authorities in each applicable territory.

If our partners or the third-party manufacturers we or our partners engage fail to adhere to applicable GMP or other regulatory requirements, experience delays or disruptions in the availability of raw materials or experience manufacturing or distribution problems, we will suffer significant consequences, including product seizures or recalls, loss of product approval, fines and sanctions, reputational damage, shipment delays, inventory shortages, inventory write-offs and other product-related charges and increased manufacturing costs. If we experience any of these results, or if maximum or available manufacturing capacities are insufficient to meet demand, our and our partners’ development or commercialization efforts may be materially harmed.

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If any of our linaclotide partners undergoes a change of control or in management, this may adversely affect our collaborative relationship or the success of the commercialization of linaclotide in the U.S. or in the other countries where it is approved, or the ability to achieve regulatory approval, launch and commercialize linaclotide in other territories.

We work jointly and collaboratively with partners on many aspects of the development, manufacturing and/or commercialization of linaclotide. In doing so, we have established relationships with several key members of the management teams of our linaclotide partners in functional areas such as development, quality, regulatory, drug safety and pharmacovigilance, operations, marketing, sales, field operations and medical science. Further, the success of our collaborations is highly dependent on the resources, efforts and skills of our partners and their key employees. As we and our partners develop and commercialize linaclotide in the U.S. and the other countries where it is approved, and develop, launch and commercialize linaclotide in other parts of the world, the drug’s success becomes more dependent on us maintaining highly collaborative and well aligned partnerships. In May 2020, AbbVie announced the completion of its acquisition of Allergan. Our collaboration, now with AbbVie, for the development and commercialization of linaclotide in North America, and our license, now to AbbVie, to develop and commercialize linaclotide in all countries worldwide other than China (including Hong Kong and Macau) and Japan, remain in effect. In connection with this transaction, we continue to engage with AbbVie to reestablish relationships and confirm alignment, including on our development and commercialization strategy for linaclotide. Any failure to do so could adversely affect the development and commercialization of linaclotide. If any of our linaclotide partners undergoes a change of control or in management, we would similarly need to reestablish many relationships and confirm alignment, including on our development and commercialization strategy for linaclotide. Further, in connection with any change of control or change in management, there is inherent uncertainty and disruption in operations, which could result in distraction, inefficiencies, and misalignment of priorities. As a result, in the event of a change of control or in management at one of our linaclotide partners, we cannot be sure that we will be able to successfully execute on our development and commercialization strategy for linaclotide in an effective and efficient manner and without disruption or reduced performance. Finally, any change of control or in management may result in a reprioritization of linaclotide within a partner’s portfolio, or such partner may fail to maintain the financial or other resources necessary to continue supporting its portion of the development, manufacturing or commercialization of linaclotide.

If any of our linaclotide partners undergoes a change of control and the acquirer either (i) is unable to perform such partner’s obligations under its collaboration or license agreement with us or (ii) does not comply with the divestiture or certain other provisions of the applicable agreement, we have the right to terminate the collaboration or license agreement and reacquire that partner’s rights with respect to linaclotide. If we elect to exercise these rights in such circumstances, we will need to either establish the capability to develop, manufacture and commercialize linaclotide in that partnered territory on our own or we will need to establish a relationship with a new partner. We have assembled a team that represents the functional areas necessary to support the commercialization of LINZESS in the U.S. If AbbVie was subject to a change of control that allowed us to further commercialize LINZESS in the U.S. on our own, and we chose to do so, we would need to enhance each of these functional aspects, as well as develop others, to replace the capabilities that AbbVie was previously providing to the collaboration. Any such transition might result in a period of reduced efficiency or performance by our operations and commercialization teams, which could adversely affect our ability to commercialize LINZESS.

We do not have certain operational capabilities outside of the U.S. If AbbVie, Astellas Pharma, Inc., or Astellas, or AstraZeneca AB (together with its affiliates), or AstraZeneca, was subject to a change of control that allowed us to continue linaclotide’s development or commercialization anywhere outside of the U.S. on our own, and we chose to do so rather than establishing a relationship with a new partner, we would need to build operational capabilities in the relevant territory. In any of these situations, the development and commercialization of linaclotide could be negatively impacted.

Risks Related to Regulatory, Legal and Compliance Matters

We face potential product liability exposure, and, if claims brought against us are successful, we could incur substantial liabilities.

The use of our product candidates in clinical trials and the sale of our approved products, including the sale of linaclotide and lesinurad, expose us to product liability claims. If we do not successfully defend ourselves against

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product liability claims, we could incur substantial liabilities. In addition, regardless of merit or eventual outcome, product liability claims may result in:

● decreased demand for approved products;

● impairment of our business reputation;

● withdrawal of clinical trial participants;

● initiation of investigations by regulators;

● litigation costs;

● distraction of management’s attention from our primary business;

● substantial monetary awards to patients or other claimants;

● loss of revenues; and

● the inability to commercialize our product candidates.

We currently have product liability insurance coverage for the commercial sale of our products and for the clinical trials of our product candidates which is subject to industry-standard terms, conditions and exclusions. Our insurance coverage may not be sufficient to reimburse us for expenses or losses associated with claims. Moreover, insurance coverage is becoming increasingly expensive, and, in the future, we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses. On occasion, large judgments have been awarded in lawsuits based on drugs that had unanticipated side effects. A successful product liability claim or series of claims could cause our stock price to decline and, if judgments exceed our insurance coverage, could decrease our cash and adversely affect our business.

We will incur significant liability if it is determined that we are promoting any “off-label” uses of our products.

Physicians are permitted to prescribe drug products and medical devices for uses that are not described in the product’s labeling and that differ from those approved by the U.S. FDA or other applicable regulatory agencies. Such “off-label” uses are common across medical specialties. Although the U.S. FDA and other regulatory agencies do not regulate a physician’s choice of treatments, the U.S. FDA and other regulatory agencies do restrict manufacturer

communications on off-label use. Companies are not permitted to promote drugs or medical devices for off-label uses or to promote unapproved drugs or medical devices. Accordingly, we do not permit promotion of any product that we develop, license, commercialize, promote, co-promote or otherwise partner prior to approval or for any indication, population or use not described in or consistent with such product’s label. The U.S. FDA and other regulatory and enforcement authorities actively enforce laws and regulations prohibiting promotion of off-label uses and the promotion of products for which marketing approval has not been obtained. A company that is found to have promoted off-label uses will be subject to significant liability, including civil and administrative remedies as well as criminal sanctions.

Even if it is later determined that we were not in violation of these laws, we may be faced with negative publicity, incur significant expenses defending our actions and have to divert significant management resources from other matters.

Notwithstanding the regulatory restrictions on off-label promotion, the U.S. FDA and other regulatory authorities allow companies to engage in truthful, non-misleading, and non-promotional scientific exchange concerning their products. We intend to engage in medical education activities and communicate with healthcare providers in compliance with all applicable laws, regulatory guidance and industry best practices. Although we believe we have put in place a robust compliance program, which is designed to ensure that all such activities are performed in a legal and compliant manner, we cannot be certain that our program will address all areas of potential exposure and the risks in this area cannot be entirely eliminated.

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If we fail to comply with healthcare and other regulations, we could face substantial penalties and our business, operations and financial condition could be adversely affected.

The products that we promote are marketed in the U.S. and/or covered by federal healthcare programs, and, as a result, certain federal and state healthcare laws and regulations pertaining to product promotion, fraud and abuse, privacy and price reporting and payment are applicable to, and may affect, our business. These laws and regulations include:

● federal healthcare program anti-kickback laws, which prohibit, among other things, persons from offering, soliciting, receiving or providing remuneration, directly or indirectly, to induce either the referral of an individual for, or the purchasing or ordering of, a good or service for which payment may be made under federal healthcare programs such as Medicare and Medicaid;

● federal false claims laws which prohibit, among other things, individuals or entities from knowingly presenting, or causing to be presented, information or claims for payment from Medicare, Medicaid, or other third-party payors that are false or fraudulent, and which may apply to us for reasons including providing coding and billing advice to customers;

● the federal Health Insurance Portability and Accountability Act of 1996, which prohibits executing a scheme to defraud any healthcare benefit program or making false statements relating to healthcare matters and which also imposes certain requirements relating to the privacy, security and transmission of individually identifiable health information on certain types of entities, which include many healthcare providers with whom we interact and health plans with which we may interact;

● the Federal Food, Drug, and Cosmetic Act, which among other things, strictly regulates drug product and medical device marketing, prohibits manufacturers from marketing such products prior to approval or for off-label use and regulates the distribution of samples;

● federal laws, including the Medicaid Drug Rebate Program, that require pharmaceutical manufacturers to report certain calculated product prices to the government or provide certain discounts or rebates to government authorities or private entities, often as a condition of reimbursement under government healthcare programs;

● the so-called “federal sunshine” law, which requires pharmaceutical and medical device companies to monitor and report certain financial interactions with physicians and teaching hospitals (and additional categories of healthcare practitioners beginning with reports submitted in 2022) to the federal government for re-disclosure to the public; and

● state law equivalents of the above federal laws, such as anti-kickback and false claims laws which may apply to items or services reimbursed by any third-party payor, including commercial insurers, state transparency laws, state laws limiting interactions between pharmaceutical manufacturers and members of the healthcare industry, and state laws governing the privacy and security of health information in certain circumstances, many of which differ from each other in significant ways and often are not preempted by federal laws, thus complicating compliance efforts.

Our global activities are subject to the U.S. Foreign Corrupt Practices Act which prohibits corporations and individuals from paying, offering to pay, or authorizing the payment of anything of value to any foreign government official, government staff member, political party, or political candidate in an attempt to obtain or retain business or to otherwise influence a person working in an official capacity. We are also subject to similar anti-bribery laws in the other countries in which we do business.

In addition, we may be subject to privacy and security laws in the various jurisdictions in which we operate, obtain or store personally identifiable information. The legislative and regulatory landscape for privacy and data protection continues to evolve, and there has been an increasing focus on privacy and data protection issues with the potential to affect our business. For example, the processing of personal data in the European Economic Area, or the EEA, is subject to the General Data Protection Regulation, or the GDPR, which took effect in May 2018. The GDPR increases obligations with respect to clinical trials conducted in the EEA, such as in relation to the provision of fair processing notices, exercising data subject rights and reporting certain data breaches to regulators and affected

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individuals, as well as how we document our relationships with third parties that process GDPR-covered personal data on our behalf. The GDPR also increases the scrutiny applied to transfers of personal data from the EEA (including from clinical trial sites in the EEA) to countries that are considered by the European Commission to lack an adequate level of data protection, such as the United States. The July 2020 invalidation of the EU-U.S. Privacy Shield framework also may lead to increased scrutiny on data transfers from the EEA to the United States generally and increase our costs of compliance with data privacy legislation. In addition, we are subject to the California Consumer Privacy Act, or CCPA, which became effective on January 1, 2020. The CCPA gives California consumers (defined to include all California residents) certain rights, including the right to ask companies to disclose the types of personal information collected, specific pieces of information collected by a company, the categories of sources from which such information was collected, the business purpose for collecting or selling the consumer’s personal information, and the categories of third parties with whom a company shares personal information. The CCPA also imposes several obligations on companies to provide notice to California consumers regarding a company’s data processing activities. Additionally, the CCPA gives California consumers the right to ask companies to delete a consumer’s personal information and it places limitations on a company’s ability to sell personal information, including providing consumers a right to opt out of sales of their personal information. The compliance obligations imposed by the GDPR and the CCPA have required us to revise our operations. In addition, the GDPR and the CCPA impose substantial fines and other regulatory penalties for breaches of data protection requirements, and they confer a private right of action on data subjects (in the case of the GDPR) and consumers (in the case of the CCPA) and their representatives for breaches of certain data protection requirements.

If our operations are found to be in violation of any of the laws described above or any other laws, rules or regulations that apply to us, we will be subject to penalties, including civil and criminal penalties, damages, fines and the curtailment or restructuring of our operations. Any penalties, damages, fines, curtailment or restructuring of our operations could adversely affect our ability to operate our business and our financial results. Although compliance programs can mitigate the risk of investigation and prosecution for violations of these laws, rules or regulations, we cannot be certain that our program will address all areas of potential exposure and the risks in this area cannot be entirely eliminated, particularly because the requirements and government interpretations of the requirements in this space are constantly evolving. Any action against us for violation of these laws, rules or regulations, even if we successfully

defend against it, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business, as well as damage our business or reputation. Moreover, achieving and sustaining compliance with applicable federal and state privacy, security, fraud and reporting laws may prove costly.

Healthcare reform and other governmental and private payor initiatives may have an adverse effect upon, and could prevent, our products’ or product candidates’ commercial success.

The U.S. government and individual states have been aggressively pursuing healthcare reform designed to impact delivery of, and/or payment for, healthcare, which include initiatives intended to reduce the cost of healthcare. For example, in March 2010, the U.S. Congress enacted the Patient Protection and Affordable Care Act, as modified by the Health Care and Education Reconciliation Act, or the ACA, which, among other things, expanded healthcare coverage through Medicaid expansion and the implementation of the individual health insurance mandate; included changes to the coverage and reimbursement of drug products under government healthcare programs; imposed an annual fee on manufacturers of branded drugs; and expanded government enforcement authority. We face uncertainties because there have been, and may be additional, federal legislative and administrative efforts to repeal, substantially modify or invalidate some or all of the provisions of the ACA. Such efforts may lead to fewer Americans having more comprehensive health insurance compliant with the ACA, even in the absence of a legislative repeal. For example, tax reform legislation was enacted at the end of 2017 that eliminated the tax penalty for individuals who do not maintain sufficient health insurance coverage beginning in 2019. The ACA has also been subject to judicial challenge. The case Texas v. Azar, which challenges the constitutionality of the ACA, including provisions that are unrelated to healthcare reform but were enacted as part of the ACA, was argued before the Supreme Court in November 2020. Pending resolution of the litigation, all of the ACA but the individual mandate to buy health insurance remains in effect. Additional healthcare reform efforts have sought to address certain issues related to the COVID-19 pandemic, including an expansion of telehealth coverage under Medicare and accelerated or advanced Medicare payments to healthcare providers. In addition, in 2020 and 2021, the U.S. Department of Health and Human Services issued various rules that affect pricing or payment for prescription drug products. For example, effective in 2022, revisions to the federal anti-kickback statute would remove protection for traditional Medicare Part D discounts offered by pharmaceutical manufacturers to pharmacy benefit managers and health plans. Healthcare reform efforts have been and may continue to be subject to legal challenge. For example, courts have temporarily enjoined a new “most favored nation” payment model for select drugs covered under Medicare Part B that was to take effect on January 1, 2021 and would limit

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payment based on international drug price. Adoption of new healthcare reform legislation at the federal or state level could affect demand for, or pricing of, our products or product candidates if approved for sale. We cannot predict, however, the ultimate content, timing or effect of any healthcare reform legislation or action, or its impact on us, and healthcare reform could increase compliance costs and may adversely affect our future business and financial results.

In addition, other legislative changes have been adopted that could have an adverse effect upon, and could prevent, our products’ or product candidates’ commercial success. More broadly, the Budget Control Act of 2011, as amended, or the Budget Control Act, includes provisions intended to reduce the federal deficit, including reductions in Medicare payments to providers through 2030 (except May 1, 2020 to March 31, 2021). Any significant spending reductions affecting Medicare, Medicaid or other publicly funded or subsidized health programs, or any significant taxes or fees imposed as part of any broader deficit reduction effort or legislative replacement to the Budget Control Act, or otherwise, could have an adverse impact on our anticipated product revenues.

In addition to governmental efforts in the U.S., foreign jurisdictions as well as private health insurers and managed care plans are likely to continue challenging manufacturers’ ability to obtain reimbursement, as well as the level of reimbursement, for pharmaceuticals and other healthcare-related products and services. These cost-control initiatives could significantly decrease the available coverage and the price we might establish for our products, which would have an adverse effect on our financial results.

The Food and Drug Administration Amendments Act of 2007 also provides the U.S. FDA enhanced post- marketing authority, including the authority to require post-marketing studies and clinical trials, labeling changes based on new safety information, and compliance with risk evaluation and mitigation strategies approved by the U.S. FDA. We and AbbVie have established a nonclinical and clinical post-marketing plan with the U.S. FDA to understand the safety and efficacy of LINZESS in pediatrics. The U.S. FDA’s exercise of this authority has resulted (and is expected to continue to result) in increased development-related costs following the commercial launch of our products, and could result in potential restrictions on the sale and/or distribution of our products, even in such products’ approved indications and patient populations.

Risks Related to the Separation of Cyclerion

We may incur operational difficulties or be exposed to claims and liabilities as a result of the separation of Cyclerion.

On April 1, 2019, we distributed all of the outstanding shares of Cyclerion Therapeutics, Inc., or Cyclerion, common stock to Ironwood stockholders in connection with the separation of our soluble guanylate cyclase business, or the Separation. In connection with the distribution, we entered into a separation agreement and various other agreements (including a tax matters agreement, an employee matters agreement, transition services agreements, an intellectual property license agreement and a development agreement). These agreements govern the separation and distribution and the relationship between us and Cyclerion going forward, including with respect to potential tax-related losses associated with the separation and distribution. In addition, the development agreement provides for the performance of services by Cyclerion for our benefit for a period of time. If Cyclerion is unable to satisfy its obligations under these agreements, we could incur losses or operational challenges or difficulties and may not have sufficient resources available for such services. These arrangements could also lead to disputes over rights to certain shared property and over the allocation of costs for products and operations.

The separation agreement provides for indemnification obligations designed to make Cyclerion financially responsible for many liabilities that may exist relating to its business activities, whether incurred prior to or after the distribution, including any pending or future litigation, but we cannot guarantee that Cyclerion will be able to satisfy its indemnification obligations. It is also possible that a court would disregard the allocation agreed to between us and Cyclerion and require us to assume responsibility for obligations allocated to Cyclerion. Third parties could also seek to hold us responsible for any of these liabilities or obligations, and the indemnity rights we have under the separation agreement may not be sufficient to fully cover all of these liabilities and obligations. Even if we are successful in obtaining indemnification, we may have to bear costs temporarily. In addition, our indemnity obligations to Cyclerion, including those related to assets or liabilities allocated to us, may be significant. These risks could negatively affect our business, financial condition or results of operations.

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If the distribution of the shares of Cyclerion common stock in connection with the Separation is not generally tax- free for U.S. federal income tax purposes, we and our stockholders could be subject to significant tax liabilities.

The distribution, together with certain related transactions, is intended to qualify for tax-free treatment to us and our stockholders for U.S. federal income tax purposes. We received a favorable private letter ruling from the Internal Revenue Service, or IRS, under the pilot program established in Revenue Procedure 2017-52 relating to the U.S. federal income tax treatment of the distribution. Consistent with the guidelines set forth in Revenue Procedure 2017-52, the IRS private letter ruling does not cover all of the issues that are relevant to determining whether the distribution is generally tax free for U.S. federal income tax purposes. Accordingly, completion of the distribution was conditioned upon, among other things, our receipt of an opinion from an outside tax advisor that the distribution will qualify as a transaction that is generally tax-free to both us and our stockholders for U.S. federal income tax purposes under Sections 355 and 368(a)(1)(D) of the Internal Revenue Code. The private letter ruling and opinion were based on and relied on, among other things, certain facts and assumptions, as well as certain representations, statements and undertakings from us and Cyclerion (including those relating to the past and future conduct of us and Cyclerion). If any of these facts, assumptions, representations, statements or undertakings is, or becomes, inaccurate or incomplete, or if we or Cyclerion breach any of our respective covenants relating to the distribution, the IRS private letter ruling and any tax opinion may be invalid. Moreover, the opinion is not binding on the IRS or any courts. Accordingly, notwithstanding receipt of the IRS private letter ruling and the opinion, the IRS could determine that the distribution and certain related transactions should be treated as taxable transactions for U.S. federal income tax purposes.

If the distribution, together with certain related transactions, fails to qualify as a transaction that is generally tax-free under Sections 355 and 368(a)(1)(D) of the Internal Revenue Code, in general, for U.S. federal income tax purposes, we would recognize taxable gain with respect to Cyclerion’s distributed common stock and our stockholders who received shares of Cyclerion common stock in the distribution would be subject to tax as if they had received a taxable distribution equal to the fair market value of such shares.

We may not achieve some or all of the anticipated benefits of the Separation, which may adversely affect our business.

We may not be able to achieve the full strategic, financial or other benefits expected to result from the Separation, or such benefits may be delayed or not occur at all. If we fail to achieve some or all of the expected benefits of the Separation, or if such benefits are delayed, our business, financial condition, results of operations and the value of our stock could be adversely impacted. The combined value of the common stock of the two publicly traded companies may not be equal to or greater than what the value of our Class A Common Stock would have been had the Separation not occurred. In addition, we are smaller and less diversified, with a narrower business focus, than we were before the Separation and therefore may be more vulnerable to changing market conditions.

Risks Related to Intellectual Property

Limitations on our ability to obtain patent protection and/or the patent rights relating to our products and our product candidates may limit our ability to prevent third parties from competing against us.

Our success depends on our ability to obtain and maintain sufficient patent protection for our products and product candidates, preserve our trade secrets, prevent third parties from infringing upon our proprietary rights and operate without infringing upon the proprietary rights of others.

The strength of patents in the pharmaceutical industry involves complex legal and scientific questions and can be uncertain. Patent applications in the U.S. and most other countries are confidential for a period of time until they are published, and publication of discoveries in scientific or patent literature typically lags actual discoveries by several months or more. As a result, we cannot be certain that we were the first to conceive inventions covered by our patents and pending patent applications or that we were the first to file patent applications for such inventions. In addition, we cannot be certain that our patent applications will be granted, that any issued patents will adequately protect our intellectual property, or that such patents will not be challenged, narrowed, invalidated or circumvented.

We have several issued patents in the U.S. related to LINZESS, including a LINZESS composition of matter and methods of use patent (U.S. Patent 7,304,036) expiring in 2026. Additional U.S. patents related to LINZESS include multiple patents relating to our commercial, room temperature stable formulations of the 72 mcg, 145 mcg and 290 mcg

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doses of linaclotide and methods of using these formulations, the latest of which expires in the early 2030s, as well as other patents covering processes for making LINZESS, formulations thereof, and molecules related to LINZESS. Although none of these issued patents currently is subject to a patent reexamination or review, we cannot guarantee that they will not be subject to reexamination or review by the U.S. Patent and Trademark Office, or the USPTO, in the future. In addition, we have several pending patent applications in the U.S. We believe in the strength of our LINZESS patent portfolio and that we have sufficient freedom to operate; however, if any of our present or future patents is challenged, narrowed, invalidated or circumvented, or our pending patent applications are not granted, our ability to prevent third parties from competing with LINZESS could be limited and our business and financial results may be materially harmed.

Furthermore, the America Invents Act, which was signed into law in 2011, has made several major changes in the U.S. patent statutes. These changes permit third parties to challenge our patents more easily and create uncertainty with respect to the interpretation and practice of U.S. patent law. Moreover, the U.S. Supreme Court has ruled on several patent cases that narrow the scope of patent protection available and weakening the rights of patent owners in certain circumstances. Depending on the impact of these decisions and other actions by the U.S. Congress, the federal courts, the USPTO, and their foreign counterparts, the laws and regulations governing patents may change, or their interpretation or implementation may change, in unpredictable ways that could impact, potentially adversely, our ability to obtain new patents or to enforce and defend patents that we have already obtained or that we might obtain in the future. For example, such changes may increase the costs and complexity associated with obtaining, enforcing or defending our patents, including in abbreviated new drug application, or ANDA, litigation.

We also rely upon unpatented trade secrets, unpatented know-how and continuing technological innovation to develop and maintain our competitive position, which we seek to protect, in part, by confidentiality agreements with our employees and our partners and consultants. We also have agreements with our employees and selected consultants that obligate them to assign their inventions to us. It is possible, however, that technology relevant to our business will be independently developed by a person that is not a party to such an agreement. Furthermore, if the employees and consultants that are parties to these agreements breach or violate the terms of these agreements, we may not have adequate remedies, and we could lose our trade secrets through such breaches or violations. Additionally, our trade secrets could otherwise become known or be independently discovered by our competitors.

In addition, the laws of certain foreign countries do not protect proprietary rights to the same extent or in the same manner as the U.S., and, therefore, we may encounter problems in protecting and defending our intellectual property in certain foreign jurisdictions.

If we are sued for infringing intellectual property rights of third parties, it will be costly and time consuming, and an unfavorable outcome in such litigation could have a material adverse effect on our business.

Our commercial success depends on our ability, and the ability of our partners, to develop, manufacture, market and sell our products and use our proprietary technologies without infringing the proprietary rights of third parties.

Numerous U.S. and foreign issued patents and pending patent applications, which are owned by third parties, exist in the fields in which we and our partners are developing products. As the biotechnology and pharmaceutical industry expands and more patents are issued, the risk increases that our potential products may give rise to claims of infringement of the patent rights of others. There may be issued patents of third parties of which we are currently unaware that may be infringed by LINZESS or our product candidates. Because patent applications can take many years to issue, there may be currently pending applications which may later result in issued patents that LINZESS or our product candidates may infringe.

We may be exposed to, or threatened with, litigation by third parties alleging that LINZESS or our product candidates infringe their intellectual property rights. If LINZESS or one of our product candidates is found to infringe the intellectual property rights of a third party, we or our partners could be enjoined by a court and required to pay damages and could be unable to develop or commercialize LINZESS or the applicable product candidate unless we obtain a license to the intellectual property rights. A license may not be available to us on acceptable terms, if at all. In addition, during litigation, the counterparty could obtain a preliminary injunction or other equitable relief which could prohibit us from making, using or selling our products, pending a trial on the merits, which may not occur for several years.

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There is a substantial amount of litigation involving patent and other intellectual property rights in the biotechnology and pharmaceutical industries generally. If a third party claims that we or our partners infringe its intellectual property rights, we may face a number of issues, including, but not limited to:

● infringement and other intellectual property claims which, regardless of merit, may be expensive and time- consuming to litigate and may divert our management’s attention from our core business;

● substantial damages for infringement, which we may have to pay if a court decides that the product at issue infringes on or violates the third party’s rights, and, if the court finds that the infringement was willful, we could be ordered to pay treble damages and the patent owner’s attorneys’ fees;

● a court prohibiting us from selling our product unless the third party licenses its rights to us, which it is not required to do;

● if a license is available from a third party, we may have to pay substantial royalties, fees or grant cross- licenses to our intellectual property rights; and

● redesigning our products so they do not infringe, which may not be possible or may require substantial monetary expenditures and time.

We have received notices of Paragraph IV certifications related to LINZESS in conjunction with ANDAs filed by generic drug manufacturers, and we may receive additional notices from others in the future. We have, and may continue to, become involved in legal proceedings to protect or enforce intellectual property rights relating to our products and our product candidates, which could be expensive and time consuming, and unfavorable outcomes in such proceedings could have a material adverse effect on our business.

Competitors may infringe the patents relating to our products and our product candidates or may assert that such patents are invalid. To counter ongoing or potential infringement or unauthorized use, we may be required to file infringement claims, which can be expensive and time-consuming. Litigation with generic manufacturers has become increasingly common in the biotechnology and pharmaceutical industries. In addition, in an infringement or invalidity proceeding, a court or patent administrative body may determine that a patent of ours is not valid or is unenforceable, or may refuse to stop the other party from using the technology at issue on the grounds that our patents do not cover the technology in question. Generic drug manufacturers were first able to file ANDAs for generic versions of LINZESS in August 2016, but we may not become aware of these filings for several months after any such submission due to procedures specified under applicable U.S. FDA regulations. When filing an ANDA for one of our products, a generic drug manufacturer may choose to challenge one or more of the patents that cover such product and seek to commercialize generic versions of one or more LINZESS doses. As such, we have brought, and may bring in the future, legal proceedings against generic drug manufacturers.

We and AbbVie have received Paragraph IV certification notice letters regarding ANDAs submitted to the U.S. FDA by generic drug manufacturers requesting approval to engage in commercial manufacture, use, sale and offer for sale of linaclotide capsules (72 mcg, 145 mcg and 290 mcg), proposed generic versions of our U.S. FDA-approved drug LINZESS. In the past, we have filed patent infringement lawsuits against five companies making such ANDA filings, and we have entered into settlement agreements dismissing the lawsuits with each company that has made ANDA filings. Frequently, innovators receive multiple ANDA filings. Consequently, we expect to receive additional notice letters regarding ANDAs submitted to the U.S. FDA, and may receive amendments to those notice letters.

After evaluation, we have in the past filed, and may, in the future, file patent infringement lawsuits or take other action against companies making ANDA filings. If a patent infringement suit has been filed within 45 days of receipt of a notice letter, the U.S. FDA is not permitted to approve any ANDA that is the subject of such lawsuit for 30 months from the date of the NDA holder’s and patent owner’s receipt of the ANDA filer’s notice letter, or until a court decides that the relevant patents are invalid, unenforceable and/or not infringed. Additionally, the validity of the patents relating to our products and our product candidates may be challenged by third parties pursuant to administrative procedures introduced by the America Invents Act, specifically inter partes review, or IPR, and/or post grant review, or PGR, before the USPTO. Generic drug manufacturers may challenge our patents through IPRs or PGRs instead of or in addition to ANDA legal proceedings.

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Patent litigation (including any lawsuits that we file against generic drug manufacturers in connection with the receipt of a notice letter), IPRs and PGRs involve complex legal and factual questions and we may need to devote significant resources to such legal proceedings. We can provide no assurance concerning the duration or the outcome of any such patent-related lawsuits or administrative proceedings, including any settlements or other resolutions thereof which could, in addition to other risks, result in a shortening of exclusivity periods. An adverse result in any litigation or defense proceedings could put one or more of the patents relating to our products and our product candidates at risk of being invalidated or interpreted narrowly, or could otherwise result in a loss of patent protection for the product or product candidate at issue, and could put our patent applications at risk of not issuing, which would materially harm our business. Upon any loss of patent protection for one of our products, or upon an “at-risk” launch (despite pending patent infringement litigation, before any court decision or while an appeal of a lower court decision is pending) by a manufacturer of a generic version of one of our patented products, our revenues for that product could be significantly reduced in a short period of time, which would materially and adversely affect our business.

Interference or derivation proceedings brought by the USPTO may be necessary to determine the priority of inventions with respect to the patents relating to our products and our product candidates and patent applications or those of our partners. An unfavorable outcome could require us to cease using the technology or to attempt to license rights to it from the prevailing party. Our business could be harmed if a prevailing party does not offer us a license on terms that are acceptable to us. Litigation or interference proceedings may fail and, even if successful, may result in substantial costs and distraction of our management and other employees. In addition, we may not be able to prevent, alone or with our partners, misappropriation of our proprietary rights, particularly in countries where the laws may not protect those rights as fully as in the U.S.

Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, as well as the potential for public announcements of the results of hearings, motions or other interim proceeding or developments, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.

Risks Related to Our Finances and Capital Requirements

We incurred significant losses from our inception in 1998 through the year ended December 31, 2018, and we may incur losses in future periods.

In recent years, we have focused primarily on developing, manufacturing and commercializing linaclotide, as well as developing our other product candidates. We have financed our business to date primarily through the issuance of equity, our collaboration and license arrangements, and debt issuances, including our June 2015 issuance of our 2.25% Convertible Senior Notes due June 15, 2022, or the 2022 Convertible Notes, and our August 2019 issuance of our 0.75% Convertible Senior Notes due 2024, or the 2024 Convertible Notes, and our 1.50% Convertible Senior Notes due 2026, or the 2026 Convertible Notes (together with the 2022 Convertible Notes and the 2024 Convertible Notes, the Convertible Senior Notes). We currently derive a significant portion of our revenue from our LINZESS collaboration with AbbVie for the U.S. We believe that the revenues from the LINZESS collaboration will continue to constitute a significant portion of our total revenue for the foreseeable future. Such revenue is highly dependent on LINZESS demand and other factors such as wholesaler buying patterns. Our collaborative arrangements revenue outside of the U.S. has and may continue to fluctuate as a result of the timing and amount of royalties from sales of linaclotide in the markets in which it is currently approved, or any other markets where linaclotide receives approval, as well as clinical and commercial milestones received and recognized under our current and future strategic partnerships outside of the U.S.

Prior to the year ended December 31, 2019, we incurred net losses in each year since our inception in 1998. As of December 31, 2020, we had an accumulated deficit of approximately $1.5 billion. We cannot be certain that sales of our products, and the revenue from our other commercial activities will not fall short of our projections or be delayed, particularly in light of the negative financial impact that the COVID-19 pandemic may have on our business in the future. Further, we expect to continue to incur substantial expenses in connection with our efforts to commercialize linaclotide and research and develop our product candidates. Because of the numerous risks and uncertainties associated with developing and commercializing pharmaceutical products, as well as those related to our expectations for our products and our other activities, we are unable to predict the extent of any future losses. Failure to achieve sustainable net income and maintain positive cash flows would have an adverse effect on stockholders’ equity and working capital.

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We may need additional funding and may be unable to raise capital when needed, which could cause us to delay, reduce or eliminate our corporate or product development or commercialization efforts.

We have previously raised funds to finance our operations through capital raising activities, including the sale of shares of our Class A Common Stock in public offerings and convertible and other debt issuances. However, marketing and selling primary care drugs, purchasing commercial quantities of pharmaceutical products, developing product candidates, conducting clinical trials and accessing externally developed products are expensive and uncertain. Circumstances, our strategic imperatives, or opportunities to create or acquire new programs, as well as maturities, redemptions or repurchases of our outstanding debt securities, could require us to, or we may choose to, seek to raise additional funds. The amount and timing of our future funding requirements will depend on many factors, including, but not limited to:

● the level of underlying demand for our products by prescribers and patients in the countries in which they are approved;

● the costs associated with commercializing our products in the U.S.;

● the costs of establishing, maintaining and/or expanding sales, marketing, distribution, and market access capabilities for our products;

● the regulatory approval of linaclotide within new indications, populations and formulations, as well as the associated development and commercial milestones and royalties;

● the rate of progress, the cost of our clinical trials and the other costs associated with our development programs, including our post-approval nonclinical and clinical studies of linaclotide in pediatrics and our investment to enhance the clinical profile of LINZESS within IBS-C and CIC, as well as to study linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions;

● the costs and timing of in-licensing additional products or product candidates or acquiring other complementary companies or assets;

● the achievement and timing of milestone payments and royalties due or payable under our collaboration and license agreements;

● the status, terms and timing of any collaboration, licensing, co-commercialization or other arrangements;

● the timing of any regulatory approvals of our product candidates;

● whether the holders of our Convertible Senior Notes hold the notes to maturity without conversion into our Class A Common Stock and whether we are required to repurchase any of our Convertible Senior Notes prior to maturity upon a fundamental change, as defined in each of the indentures governing the Convertible Senior Notes; and

● whether we seek to redeem, repurchase or retire all or part of our outstanding debt through cash purchases and/or exchanges, in open market purchases, privately negotiated transactions, by tender offer or otherwise.

Additional funding may not be available on acceptable terms or at all. If adequate funds are not available, we may be required to delay or reduce the scope of our commercialization efforts, delay, reduce or eliminate one or more of our development programs or delay or abandon potential strategic opportunities.

Our ability to pay principal of and interest on our outstanding debt securities will depend in part on the receipt of payments from AbbVie under our collaboration agreement for North America.

In June 2015, we issued approximately $335.7 million aggregate principal amount of our 2022 Convertible Notes bearing an annual interest rate of 2.25%. In August 2019, we issued $200.0 million aggregate principal amount of our 2024 Convertible Notes bearing an annual interest rate of 0.75% and $200.0 million aggregate principal amount of

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our 2026 Convertible Notes bearing an annual interest rate of 1.50%, and we used a portion of the proceeds from this offering to repurchase $215.0 million aggregate principal amount of the 2022 Convertible Notes. Semi-annual payments on our 2022 Convertible Notes began on December 15, 2015 and semi-annual payments on each of our 2024 Convertible Notes and 2026 Convertible Notes began on December 15, 2019. We expect that for the next few years, at a minimum, the net quarterly payments from AbbVie will be a significant source of cash flows from operations. If the cash flows derived from the net quarterly payments that we receive from AbbVie under the collaboration agreement for North America are insufficient on any particular payment date to fund the interest payment on our outstanding indebtedness, at a minimum, we will be obligated to pay the amounts of such shortfall out of our general funds. The determination of whether AbbVie will be obligated to make a net quarterly payment to us in respect of a particular quarterly period is a function of the revenue generated by LINZESS in the U.S. as well as the development, manufacturing and commercialization expenses incurred by each of us and AbbVie under the collaboration agreement for North America. Accordingly, since we cannot guarantee that our company will maintain net income or positive cash flows, we cannot provide assurances that (i) we will have the available funds to fund the interest payment on our outstanding indebtedness, at a minimum, in the event that there is a deficiency in the net quarterly payment received from AbbVie, (ii) there will be a net quarterly payment from AbbVie at all or (iii) we will not also be required to make a true-up payment to AbbVie under the collaboration agreement for North America, in each case, in respect of a particular quarterly period.

Our indebtedness could adversely affect our financial condition or restrict our future operations.

As of December 31, 2020, we had total indebtedness of approximately $520.7 million and available cash and cash equivalents of approximately $362.6 million. Our indebtedness, combined with our other financial obligations and contractual commitments, could have important consequences on our business, including:

● limiting our ability to obtain additional financing to fund future working capital, capital expenditures or other general corporate purposes, including product development, commercialization efforts, research and development activities, strategic arrangements, acquisitions and refinancing of our outstanding debt;

● requiring a substantial portion of our cash flows to be dedicated to debt service payments instead of other purposes, thereby reducing the amount of cash flows available for working capital, capital expenditures, corporate transactions and other general corporate purposes;

● increasing our vulnerability to adverse changes in general economic, industry and competitive conditions;

● limiting our flexibility in planning for and reacting to changes in the industry in which we compete;

● placing us at a disadvantage compared to other, less leveraged competitors or competitors with comparable debt at more favorable interest rates; and

● increasing our cost of borrowing.

If we do not generate sufficient cash flows from operations or if future borrowings are not available to us in an amount sufficient to pay our indebtedness, including payments of principal when due on our outstanding indebtedness or, in the case of our Convertible Senior Notes, in connection with a transaction involving us that constitutes a fundamental change under the indentures governing the Convertible Senior Notes, or to fund our liquidity needs, we may be forced to refinance all or a portion of our indebtedness on or before the maturity dates thereof, sell assets, reduce or delay currently planned activities or curtail operations, seek to raise additional capital or take other actions. We may not be able to execute any of these actions on commercially reasonable terms or at all. This, together with any of the factors described above, could materially and adversely affect our business, financial condition and results of operations.

In addition, while none of the indentures governing our Convertible Senior Notes includes covenants restricting the operation of our business except in certain limited circumstances, in the event of a default under any of the Convertible Senior Notes, the applicable noteholders or the trustee under the indenture governing the applicable Convertible Senior Notes may accelerate our payment obligations under such Convertible Senior Notes, which could have a material adverse effect on our business, financial condition and results of operations. We are also required to offer to repurchase the Convertible Senior Notes upon the occurrence of a fundamental change, which could include, among other things, any acquisition of our company (other than an acquisition in which at least 90% of the consideration is

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Class A Common Stock listed on The Nasdaq Global or Global Select Market or The New York Stock Exchange), subject to the terms of each of the indenture governing the Convertible Senior Notes. The repurchase price must be paid in cash, and this obligation may have the effect of discouraging, delaying or preventing an acquisition of our company that would otherwise be beneficial to our security holders.

Each of the indentures governing our Convertible Senior Notes also includes cross-default features providing that certain failures to pay for outstanding indebtedness would result in a default under the indentures governing our Convertible Senior Notes. In the event of such default, the trustee or noteholders could elect to declare all amounts outstanding to be immediately due and payable under the applicable indenture, which could have a material adverse effect on our business, financial condition and results of operations.

Convertible note hedge and warrant transactions entered into in connection with our 2022 Convertible Notes and capped call transactions entered into in connection with our 2024 Convertible Notes and our 2026 Convertible Notes may affect the value of our Class A Common Stock.

In connection with the issuance of our 2022 Convertible Notes, we entered into convertible note hedge transactions, or the Convertible Note Hedges, and separate note hedge warrant transactions, or the Note Hedge Warrants, with certain financial institutions. The Convertible Note Hedges and Note Hedge Warrants were partially terminated in connection with the repurchase of $215.0 million aggregate principal amount of the 2022 Convertible Notes in August 2019. Additionally, in connection with the issuance of our 2024 Convertible Notes and our 2026 Convertible Notes, we entered into capped call transactions, or the Capped Calls, with certain financial institutions. These transactions are expected generally to reduce the potential dilution upon any conversion of our 2022 Convertible Notes, our 2024 Convertible Notes or our 2026 Convertible Notes, as applicable, or offset any cash payments we are required to make in excess of the principal amount of converted Convertible Senior Notes, as the case may be.

In connection with these transactions, the financial institutions likely purchased our Class A Common Stock in secondary market transactions and entered into various over-the-counter derivative transactions with respect to our Class A Common Stock. These entities or their affiliates are likely to modify their hedge positions from time to time prior to conversion or maturity of the 2022 Convertible Notes, the 2024 Convertible Notes and the 2026 Convertible Notes, as applicable, by purchasing and selling shares of our Class A Common Stock or other instruments they may wish to use in connection with such hedging. Any of these activities could adversely affect the value of our Class A Common Stock and, as a result, the number of shares and the value of the Class A Common Stock noteholders will receive upon conversion of the 2022 Convertible Notes, the 2024 Convertible Notes or the 2026 Convertible Notes, as applicable. In addition, under certain circumstances the counterparties have the right to terminate the Convertible Note Hedges and Capped Calls and settle the Note Hedge Warrants on terms set forth in the applicable confirmations, which may result in us not receiving all or any portion of the anticipated benefit of the Convertible Note Hedges and Capped Calls. If the price of our Class A Common Stock increases such that the hedge transactions settle in our favor, we could also be exposed to credit risk related to the counterparties to the Convertible Note Hedges and Capped Calls, which would limit or eliminate the benefit of such transactions to us.

Our quarterly and annual operating results may fluctuate significantly.

We expect our operating results to be subject to frequent fluctuations. Our net income (loss) and other operating results will be affected by numerous factors, including:

● the level of underlying demand for our products in the countries in which they are approved;

● wholesalers’ buying patterns with respect to our products;

● the costs associated with commercializing our products in the U.S.;

● the achievement and timing of milestone payments and royalties due or payable under our collaboration and license agreements;

● our execution of any collaboration, partnership, licensing or other strategic arrangements, and the timing of payments we may make or receive under these arrangements;

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● any impairments of assets or goodwill, and associated write-downs;

● any variations in the level of expenses related to our development programs;

● addition or termination of clinical trials;

● regulatory developments affecting our products and product candidates;

● any material lawsuit in which we may become involved; and

● the impact of the COVID-19 pandemic or other public health epidemics, including containment or mitigation measures, or natural disasters.

If our operating results fall below the expectations of investors or securities analysts for any of the foregoing reasons or otherwise, the price of our Class A Common Stock could decline substantially. Furthermore, any quarterly or annual fluctuations in our operating results may, in turn, cause the price of our stock to fluctuate substantially.

Our ability to use net operating loss and tax credit carryforwards and certain built-in losses to reduce future tax payments is limited by provisions of the Internal Revenue Code, and it is possible that our net operating loss and tax credit carryforwards may expire before we generate sufficient taxable income to use such carryforwards, or that certain transactions or a combination of certain transactions may result in material additional limitations on our ability to use our net operating loss and tax credit carryforwards.

Prior to the year ended December 31, 2019, we incurred significant net losses since our inception. To the extent that we do not generate federal and state taxable income in the future, unused net operating loss and tax credit carryforwards will carry forward to offset future taxable income, if any, until the date, if any, on which such unused carryforwards expire. Sections 382 and 383 of the Internal Revenue Code of 1986, as amended, contain rules that limit the ability of a company that undergoes an ownership change, which is generally any change in ownership of more than 50% of its stock over a three-year period, to utilize its net operating loss and tax credit carryforwards and certain built-in losses recognized in years after the ownership change. These rules generally operate by focusing on ownership changes involving stockholders owning directly or indirectly 5% or more of the stock of a company and any change in ownership arising from a new issuance of stock by the company. Generally, if an ownership change occurs, the yearly taxable income limitation on the use of net operating loss and tax credit carryforwards and certain built-in losses is equal to the product of the applicable long term tax exempt rate and the value of the company’s stock immediately before the ownership change. Certain future equity offerings or strategic transactions, if any, could potentially result in a 50% or greater change of control.

If we do not generate sufficient taxable income prior to the expiration, if any, of the applicable carryforwards or if the carryforwards are subject to the limitations described above, we may be unable to offset our taxable income with losses, or our tax liability with credits, before such losses and credits expire and therefore would incur larger federal or state income tax liability. We have completed several financings since our inception which may have resulted in a change in control as defined by Section 382, or could result in a change in control in the future.

General Risk Factors

Public health emergencies, epidemics, or pandemics, such as the COVID-19 pandemic, impact our business.

In December 2019, a novel strain of coronavirus (COVID-19) emerged in Wuhan, Hubei Province, China. On March 11, 2020, the World Health Organization declared a global pandemic and recommended containment and mitigation measures worldwide. On March 13, 2020, former U.S. President Donald Trump announced a national emergency relating to the pandemic. Government authorities in the U.S. have recommended or imposed various containment and mitigation measures on large portions of the population, and similar measures have also been taken in many other countries around the world. Both the outbreak of COVID-19 and the containment and mitigation efforts have a serious adverse impact on the U.S. economy and the economies of other countries around the world, the severity and duration of which are uncertain. Government stabilization efforts will only partially mitigate the consequences.

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The COVID-19 pandemic has impacted, and is expected to continue to impact, our business and operations in a number of ways and there are significant uncertainties surrounding the extent and duration of such impacts. Factors that will influence the impact on our business and operations include the duration and extent of the outbreak, the duration and extent of imposed or recommended containment and mitigation measures, and the general economic consequences of the pandemic. Addressing the impacts of the COVID-19 pandemic has, and likely will for an extended period, required significant time and has diverted the attention of our management, other employees and our board of directors.

The increase in virtual customer support and limitations on customer access by our customer-facing employees that was prompted by the COVID-19 pandemic contributed to our decision to make virtual promotion a more permanent component of our overall selling model and may further change our commercial model or the market strategy in the industry. Should we be unable to evolve with any changes in the commercial landscape, we may be unable to maintain or grow our revenues from the commercialization of LINZESS or successfully commercialize future products. In addition, changes in insurance coverage or reimbursement levels by governmental authorities, private health insurers and other third-party payors, or changes in the type of such coverage held by patients (including changes from commercial insurance to Medicaid) or the loss of coverage by some patients, due to the impacts of the COVID-19 pandemic (including the related increase in unemployment in the U.S.) may negatively impact our revenue from LINZESS. Moreover, continuing impacts to healthcare access or administration (including, for example, limitations on medications or procedures deemed “non-essential” and reduced interaction between patients and physicians) due to the COVID-19 pandemic may impact demand for LINZESS and materially harm our business and commercialization efforts.

Most of our customer-facing employees are engaged in in-person work practices; however, they are limited in the number of in-person details they are able to conduct due to containment and mitigation measures related to the COVID-19 pandemic. We monitor the impact of the COVID-19 pandemic in the territories where our customer-facing employees are engaged in in-person work practices, and in some cases, we have paused or delayed in-person work practices as a result of the impact of the COVID-19 pandemic in those territories, and may do so again in the future. Customer-facing employees who are not providing in-person services continue to support their customers virtually through telephone and web-based technologies. Headquarters employees are expected to have the option to work remotely through mid-2021. We may delay, stop or otherwise limit in-person work in the future pending relevant health authority guidance and additional safety or other considerations. If our employees are unable to work from home effectively, or if the COVID-19 pandemic otherwise impacts employees’ ability to work, for example due to containment and mitigation measures related to the COVID-19 pandemic, illness, lack of resources or inadequate technology, or restrictions, closures or other limits on school and other childcare options, our business will be materially harmed. Specifically, new or continuing limits on the ability of our customer-facing employees to meet with physicians and patients to visit healthcare providers and pharmacists (including due to continued or future remote working arrangements, containment and mitigation measures that limit access to customers or other restrictions related to the COVID-19 pandemic) may have an extended negative impact on LINZESS sales.

Revenue from LINZESS sales or the progression of our trials will be affected should the COVID-19 pandemic cause significant disruptions to manufacturing operations or supply of LINZESS to the U.S. or API, finished drug product or finished goods for linaclotide or our product candidates, for example due to impacts of the COVID-19 pandemic on personnel involved in the manufacturing and supply chain, international travel and shipping restrictions, inability of vendors to provide services, closed manufacturing sites, or any other disruptions in the international supply chain. In addition, the COVID-19 pandemic has impacted enrollment in our clinical trials, and may impact clinical trial enrollment or participation in the future, for example due to suspension of in-person procedures required for enrollment or lower or discontinued patient participation compared to pre-COVID-19 pandemic levels. Specifically, prior to our decision to discontinue development of IW-3718, the COVID-19 pandemic impacted enrollment in our Phase III clinical trials of IW-3718 for the treatment of refractory gastroesophageal reflex disease, or refractory GERD. In addition, the progression of our pipeline could be impacted should any of our key vendors, including clinical research organizations, or CROs, and other clinical vendors, be unable to provide timely or sufficient services due to the impact of the COVID- 19 pandemic.

The spread of COVID-19 continues to disrupt the U.S. healthcare and healthcare regulatory system. Capital markets in the U.S. and around the world have also been negatively impacted, which may harm our business, including our ability to obtain future financing. The COVID-19 pandemic, including containment and mitigation measures, has impacted our business and operations, and could have a material adverse impact on our financial condition and results of operations in the future, including for an extended period of time.

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We may not be able to manage our business effectively if we lose any of our current management team or if we are unable to attract, motivate and retain key personnel.

We may not be able to attract, motivate or retain qualified management and scientific, clinical, operations and commercial personnel due to the intense competition for qualified personnel among biotechnology, pharmaceutical and other businesses, particularly in the greater-Boston area. If we are not able to attract, motivate and retain necessary personnel to accomplish our business objectives, we will experience constraints that will significantly impede the achievement of our objectives.

We are highly dependent on the drug research, development, regulatory, commercial, financial and other expertise of our management, particularly Mark Mallon, our chief executive officer; Gina Consylman, our senior vice president, chief financial officer, and treasurer; Thomas A. McCourt, our president; Jason Rickard, our senior vice president and chief operating officer and Michael Shetzline, our senior vice president, chief medical officer and head of drug development. On February 4, 2021, Mr. Mallon notified us that he is resigning his position as chief executive officer and a member of our company’s board of directors, in each case effective March 12, 2021. Effective upon Mr. Mallon’s departure, Mr. McCourt will serve as our interim chief executive officer while the Board conducts a candidate search for Mr. Mallon’s permanent successor. This and any additional transitions in our senior management team or other key employees, or the unavailability of any such persons for any reason (including due to the COVID-19 pandemic), can be inherently difficult to manage and may disrupt our operations or business or otherwise harm our business, for example due to the diversion of our board and management’s time and attention and a decline in employee morale. Further, if we are unable to attract a qualified candidate to become our permanent chief executive officer in a timely manner, our business and prospects may be adversely affected. In addition to the competition for personnel, the Boston area in particular is characterized by a high cost of living. As such, we could have difficulty attracting experienced personnel to our company and may be required to expend significant financial resources in our employee recruitment efforts, which may or may not be successful.

We also have scientific and clinical advisors who assist us in formulating our product development, clinical strategies and our global supply chain plans, as well as sales and marketing advisors who have assisted us in our commercialization strategy and brand plan for our products. These advisors are not our employees and may have commitments to, or consulting or advisory contracts with, other entities that may limit their availability to us, or may have arrangements with other companies to assist in the development and commercialization of products that may compete with ours. 

Security breaches and other disruptions to our information technology structure could compromise our information, disrupt our business and expose us to liability, which would cause our business and reputation to suffer.

In the ordinary course of our business, we collect, process and store sensitive data, including intellectual property, our proprietary business information and that of our suppliers and business partners, as well as personally identifiable information of our patients, clinical trial participants and employees. We also rely to a large extent on information technology systems to operate our business, including to deliver our products. We have outsourced elements of our confidential information processing and information technology structure, and as a result, we are managing independent vendor relationships with third parties who may or could have access to our confidential information. Similarly, our business partners and other third-party providers possess certain of our sensitive data. The secure maintenance of this information is critical to our operations and business strategy. Despite our security measures, our large and complex information technology and infrastructure (and those of our partners, vendors and third-party providers) may be vulnerable to attacks by hackers or breached due to employee, partner, vendor or third-party error, malfeasance or other disruptions. We, our partners, vendors and other third-party providers could be susceptible to third party attacks on our, and their, information security systems, which attacks are of ever-increasing levels of sophistication and are made by groups and individuals with a wide range of motives and expertise, including organized criminal groups, hacktivists, nation states and others. While we have invested in information technology and security and the protection of confidential information, there can be no assurance that our efforts will prevent service interruptions or security breaches. Further, while some or all of our workforce, and those of our partners, vendors and other third-party providers, work remotely as a result of the COVID-19 pandemic or otherwise, we may have greater vulnerability to cyberattacks or other losses of confidential information, as well as interruptions in information technology systems. Any such interruptions, losses or breaches would substantially impair our ability to operate our business and would compromise our, or our partners, vendors and other third-party providers, networks and the information stored there could be accessed, publicly disclosed, lost or stolen. Any such access, disclosure or other loss of information could result

44

in legal claims or proceedings, liability under laws that protect the privacy of personal information, disrupt our operations, negatively impact our financial condition and damage our reputation, any of which could adversely affect our business. While we maintain cyber liability insurance, this insurance may not be sufficient to cover the financial or other losses that may result from an interruption or breach of our (or our partners’, vendors’ and third-party providers’) systems.

Anti-takeover provisions under our charter documents and Delaware law could delay or prevent a change of control which could negatively impact the market price of our Class A Common Stock.

Provisions in our certificate of incorporation and bylaws may have the effect of delaying or preventing a change of control. These provisions include the following:

● Our board of directors is currently divided into three classes serving staggered terms, such that not all members of the board are elected at one time. This staggered board structure prevents stockholders from replacing the entire board at a single stockholders’ meeting. At our 2019 annual meeting of stockholders, our stockholders approved an amendment to our certificate of incorporation to declassify our board of directors to allow our stockholders to vote on the election of the entire board of directors on an annual basis, rather than on a staggered basis. This declassification is being phased in such that, once completed in 2022, stockholders will have the opportunity to replace the entire board at a single stockholders’ meeting and at each annual stockholders’ meeting thereafter. As required by Delaware law, the amendment to our certificate of incorporation also reflects that, once the board of directors is declassified, stockholders may remove directors with or without cause.

● Our board of directors has the right to elect directors to fill a vacancy created by the expansion of the board of directors or the resignation, death or removal of a director, which prevents stockholders from being able to fill vacancies on our board of directors.

● Our board of directors may issue, without stockholder approval, shares of preferred stock. The ability to authorize preferred stock makes it possible for our board of directors to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to acquire us.

● Stockholders must provide advance notice to nominate individuals for election to the board of directors or to propose matters that can be acted upon at a stockholders’ meeting. Furthermore, as described above, until our board of directors is declassified, stockholders may only remove a member of our board of directors for cause. These provisions may discourage or deter a potential acquirer from conducting a solicitation of proxies to elect such acquirer’s own slate of directors or otherwise attempting to obtain control of our company.

● Our stockholders may not act by written consent. As a result, a holder, or holders, controlling a majority of our capital stock are not able to take certain actions outside of a stockholders’ meeting.

● Special meetings of stockholders may be called only by the chairman of our board of directors, our chief executive officer or a majority of our board of directors. As a result, a holder, or holders, controlling a majority of our capital stock are not able to call a special meeting.

● A super-majority (80%) of the outstanding shares of Class A Common Stock are required to amend our bylaws, which make it more difficult to change the provisions described above.

In addition, we are governed by the provisions of Section 203 of the Delaware General Corporation Law, which may prohibit certain business combinations with stockholders owning 15% or more of our outstanding voting stock. These and other provisions in our certificate of incorporation and our bylaws and in the Delaware General Corporation Law could make it more difficult for stockholders or potential acquirers to obtain control of our board of directors or initiate actions that are opposed by the then-current board of directors.

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If we identify a material weakness in our internal control over financial reporting, it could have an adverse effect on our business and financial results and our ability to meet our reporting obligations could be negatively affected, each of which could negatively affect the trading price of our Class A Common Stock.

A material weakness is a deficiency, or a combination of deficiencies, in internal control over financial reporting, such that there is a reasonable possibility that a material misstatement of our annual or interim financial statements will not be prevented or detected on a timely basis. Accordingly, a material weakness increases the risk that the financial information we report contains material errors.

We regularly review and update our internal controls, disclosure controls and procedures, and corporate governance policies. In addition, we are required under the Sarbanes-Oxley Act of 2002 to report annually on our internal control over financial reporting. Our system of internal controls, however well-designed and operated, is based in part on certain assumptions and includes elements that rely on information from third parties, including our partners. Our system can provide only reasonable, not absolute, assurances that the objectives of the system are met. If we, or our independent registered public accounting firm, determine that our internal controls over financial reporting are not effective, or we discover areas that need improvement in the future, these shortcomings could have an adverse effect on our business and financial results, and the price of our Class A Common Stock could be negatively affected.

Further, we are dependent on our partners for information related to our results of operations. Our net profit or net loss generated from the sales of LINZESS in the U.S. is partially determined based on amounts provided by AbbVie and involves the use of estimates and judgments, which could be modified in the future. We are highly dependent on our linaclotide partners for timely and accurate information regarding any revenues realized from sales of linaclotide in their respective territories, and in the case of AbbVie for the U.S., the costs incurred in developing and commercializing it in order to accurately report our results of operations. Our results of operations are also dependent on the timeliness and accuracy of information from any other licensing, collaboration or other partners we may have, as well as our and our partners’ use of estimates and judgments. If we do not receive timely and accurate information or if estimated activity levels associated with the relevant collaboration or partnership at a given point in time are incorrect, whether the result of a material weakness or not, we could be required to record adjustments in future periods. Such adjustments could have an adverse effect on our financial results, which could lead to a decline in our Class A Common Stock price.

If we cannot conclude that we have effective internal control over our financial reporting, or if our independent registered public accounting firm is unable to provide an unqualified opinion regarding the effectiveness of our internal control over financial reporting, investors could lose confidence in the reliability of our financial statements, which could lead to a decline in our stock price. Failure to comply with reporting requirements could also subject us to sanctions and/or investigations by the SEC, The Nasdaq Stock Market or other regulatory authorities.

We expect that the price of our Class A Common Stock will fluctuate substantially.

The market price of our Class A Common Stock may be highly volatile due to many factors, including:

● the commercial performance of our products in the countries in which they are approved, as well as the costs associated with such activities;

● any third-party coverage and reimbursement policies for our products;

● market conditions in the pharmaceutical and biotechnology sectors;

● developments, litigation or public concern about the safety of our products or our potential products;

● announcements of the introduction of new products by us or our competitors;

● announcements concerning product development, including clinical trial results or timelines, or intellectual property rights of us or others;

● actual and anticipated fluctuations in our quarterly and annual operating results;

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● deviations in our operating results from any guidance we may provide or the estimates of securities analysts;

● sales of additional shares of our Class A Common Stock or sales of securities convertible into Class A Common Stock or the perception that these sales might occur;

● additions or departures of key personnel;

● developments concerning current or future collaboration, partnership, licensing or other strategic arrangements;

● discussion of us or our stock price in the financial or scientific press or in online investor communities; and

● the impact of the COVID-19 pandemic or other public health epidemics, including containment or mitigation measures, or natural disasters.

Our business could be negatively affected as a result of a proxy contest or certain other stockholder actions.

Responding to certain stockholder actions can be costly, disruptive and time-consuming, and could also impact our ability to attract, retain and motivate our employees. For example, a proxy contest for our annual meeting of stockholders relating to stockholder proposals or director nominees would require significant time and could divert the attention of our management, other employees and our board of directors. In addition, a proxy contest would require us to incur significant costs, including legal fees and proxy solicitation expenses. The realization of any of the risks described in these “Risk Factors” could have a dramatic and material adverse impact on the market price of our Class A Common Stock. In addition, class action litigation has often been instituted against companies whose securities have experienced periods of volatility. Any such litigation brought against us could result in substantial costs and a diversion of management attention, which could hurt our business, operating results and financial condition.

Item 1B.    Unresolved Staff Comments

None.

Item 2.    Properties

Our corporate headquarters and operations are located in Boston, Massachusetts, where, as of December 31, 2020, we occupied approximately 39,000 square feet of office space under our lease expiring in June 2030. We believe that our facilities are suitable and adequate for our needs for the foreseeable future.

Item 3.    Legal Proceedings

None.

Item 4.    Mine Safety Disclosures

Not applicable.

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PART II

Item 5.    Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities

Shares of our Class A Common Stock are traded on the Nasdaq Global Select Market under the symbol “IRWD.” Our shares have been publicly traded since February 3, 2010. As of February 10, 2021, there were 51 stockholders of record of our Class A Common Stock. The number of record holders is based upon the actual number of holders registered on the books of the company at such date and does not include holders of shares in “street names” or persons, partnerships, associations, corporations or other entities identified in security position listings maintained by depositories.

Subject to preferences that may apply to any shares of preferred stock outstanding at the time, the holders of Class A Common Stock are entitled to share equally in any dividends that our board of directors may determine to issue from time to time. In the event a dividend is paid in the form of shares of common stock or rights to acquire shares of common stock, the holders of Class A Common Stock will receive Class A Common Stock, or rights to acquire Class A Common Stock, as the case may be.

We have never declared or paid any cash dividends on our capital stock, and we do not currently anticipate declaring or paying cash dividends on our capital stock in the foreseeable future. We currently intend to retain all of our future earnings, if any, to finance operations. Any future determination relating to our dividend policy will be made at the discretion of our board of directors and will depend on a number of factors, including future earnings, capital requirements, financial conditions, future prospects, contractual restrictions and covenants and other factors that our board of directors may deem relevant.

The information required to be disclosed by Item 201(d) of Regulation S-K, “Securities Authorized for Issuance Under Equity Compensation Plans,” is referenced under Item 12 of Part III of this Annual Report on Form 10-K.

Corporate Performance Graph

The following performance graph and related information shall not be deemed to be “soliciting material” or to be “filed” with the SEC, nor shall such information be incorporated by reference into any future filing under the Securities Act of 1933, as amended, or the Securities Act, except to the extent that we specifically incorporate it by reference into such filing.

On April 1, 2019, we completed the separation, or the Separation, of our soluble guanylate cyclase, or sGC, business, and certain other assets and liabilities, into a separate, independent publicly traded company, Cyclerion Therapeutics, Inc., or Cyclerion. The Separation was effected by means of a distribution of all the outstanding shares of common stock, with no par value, of Cyclerion, through a dividend of Cyclerion’s common stock to our stockholders of record as of the close of business on March 19, 2019.

The following graph compares the performance of our Class A Common Stock to the Nasdaq Benchmark TR Index (U.S.) and to the Nasdaq Pharmaceutical Benchmark TR Index (U.S.) from December 31, 2015 through December 31, 2020. The comparison assumes $100 was invested after the market closed on December 31, 2014 in our Class A Common Stock and in each of the presented indices, and it assumes reinvestment of dividends, if any (other than any Cyclerion common stock distributed in connection with the Separation). Total returns reflected in the following graph for periods prior to the date of the Separation have been adjusted for the effect of the Separation to exclude the sGC business.

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COMPARISON OF QUARTERLY CUMULATIVE TOTAL RETURN

Among The Nasdaq Benchmark TR Index (U.S.),

the Nasdaq Pharmaceutical Benchmark TR Index (U.S.)

and Ironwood Pharmaceuticals, Inc.

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Item 6. Selected Financial Data

You should read the following selected financial data together with our consolidated financial statements and the related notes appearing elsewhere in this Annual Report on Form 10-K. We have derived the consolidated statements of operations data for the years ended December 31, 2020, 2019, and 2018 and the consolidated balance sheet data as of December 31, 2020 and 2019 from our audited financial statements included elsewhere in this Annual Report on Form 10-K. We have derived the consolidated statements of operations data for the years ended December 31, 2017 and 2016 and the consolidated balance sheet data as of December 31, 2018, 2017, and 2016 from our audited financial statements not included in this Annual Report on Form 10-K. During the year ended December 31, 2019, we completed the separation of our soluble guanylate cyclase, or sGC, business, or the Separation. Results of operations related to our sGC business have been reclassified to reflect discontinued operations for all periods presented. Our historical results for any prior period are not necessarily indicative of results to be expected in any future period.

	Year Ended December 31,
	2020		2019		2018		2017		2016
	(in thousands, except per share data)
Consolidated Statement of Operations Data:
Revenues:
Collaborative arrangements revenue(1)	$	381,545	$	379,652	$	272,839	$	265,533	$	263,923
Product revenue, net		—		—		3,445		3,061		109
Sale of active pharmaceutical ingredient		7,978		48,761		70,355		29,682		9,925
Total revenues		389,523		428,413		346,639		298,276		273,957
Cost and expenses:
Cost of revenues, excluding amortization of acquired intangible assets(2)		3,136		23,875		32,751		19,097		1,868
Write-down of commercial supply and inventory to net realizable value and (settlement) loss on non-cancellable purchase commitments(3)		—		(3,530)		247		309		374
Research and development		88,062		115,044		101,060		88,145		101,903
Selling, general and administrative		140,003		172,450		219,676		231,184		169,169
Amortization of acquired intangible asset(4)		—		—		8,111		6,214		981
(Gain) loss on fair value remeasurement of contingent consideration(4)		—		—		(31,045)		(31,310)		9,831
Gain on lease modification(5)		—		(3,169)		—		—		—
Restructuring expenses(6)		15,382		3,620		14,715		—		—
Impairment of intangible assets(4)		—		—		151,794		—		—
Total cost and expenses		246,583		308,290		497,309		313,639		284,126
Income (loss) from operations		142,940		120,123		(150,670)		(15,363)		(10,169)
Other (expense) income:
Interest expense		(29,478)		(36,602)		(37,724)		(36,370)		(39,153)
Interest and investment income		1,504		2,862		2,991		2,111		1,169
Gain (loss) on derivatives(7)		(6,129)		3,023		(8,743)		(3,284)		8,146
Loss on extinguishment of debt (8)		—		(30,977)		—		(2,009)		—
Other income(9)		24		514		—		—		—
Other expense, net		(34,079)		(61,180)		(43,476)		(39,552)		(29,838)
Income (loss) from continuing operations		108,861		58,943		(194,146)		(54,915)		(40,007)
Income tax expense		2,685		—		—		—		—
Income from continuing operations		106,176		58,943		(194,146)		(54,915)		(40,007)
Loss from discontinued operations, net of income taxes		—		(37,438)		(88,222)		(62,022)		(41,701)
Net income (loss) and comprehensive income (loss)	$	106,176	$	21,505	$	(282,368)	$	(116,937)	$	(81,708)
Income per share from continuing operations, net of income taxes—basic	$	0.67	$	0.38	$	(1.27)	$	(0.37)	$	(0.28)
Income per share from continuing operations, net of income taxes— diluted		0.66		0.38		(1.27)		(0.37)		(0.28)
Loss per share from discontinued operations, net of income taxes—basic and diluted		—		(0.24)		(0.58)		(0.42)		(0.29)
Net income (loss) per share—basic		0.67		0.14		(1.85)		(0.78)		(0.56)
Net income (loss) per share—diluted		0.66		0.14		(1.85)		(0.78)		(0.56)
Weighted average shares used in computing net income per share—basic:		159,427		156,023		152,634		148,993		144,928
Weighted average shares used in computing net income per share— diluted:		160,655		156,023		152,634		148,993		144,928

(1) Collaborative arrangements revenue for the year ended December 31, 2020 included approximately $368.6 million related to our share of sales of LINZESS^® (linaclotide) in the U.S.

Collaborative arrangements revenue for the year ended December 31, 2019 included approximately $325.4 million related to our share of sales of LINZESS in the U.S., approximately $32.4 million in non-contingent payments from

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AstraZeneca AB (together with its affiliates), or AstraZeneca, and $10.0 million related to the upfront fee from Astellas Pharma Inc.

Collaborative arrangements revenue for the year ended December 31, 2018 included approximately $264.2 million related to our share of sales of LINZESS in the U.S., which included an approximately $29.9 million adjustment related to a change in estimate of gross-to-net sales reserves and allowances, primarily associated with governmental and contractual rebates.

Collaborative arrangements revenue for the year ended December 31, 2017 included approximately $256.2 million related to our share of sales of LINZESS in the U.S.

Collaborative arrangements revenue for the year ended December 31, 2016 included approximately $217.7 million related to our share of sales of LINZESS in the U.S. and $30.0 million related to the receipt of milestone payments.

(2) Cost of revenues for the year ended December 31, 2020 included approximately $3.1 million related to sales of linaclotide API and finished drug product.

Cost of revenues for the year ended December 31, 2019 included approximately $23.9 million related to sales of linaclotide API and finished drug product.

Cost of revenues for the year ended December 31, 2018 included approximately $31.6 million related to sales of linaclotide API and finished drug product.

Cost of revenues for the year ended December 31, 2017 included approximately $16.5 million related to sales of linaclotide API and finished drug product.

(3) During the year ended December 31, 2019, we recorded settlements of approximately $3.5 million related to the reversal of certain previously accrued non-cancelable purchase commitments.

During the year ended December 31, 2018, we wrote down approximately $0.2 million of ZURAMPIC^® commercial supply as a result of revised demand forecasts due to the termination of our exclusive license to develop, manufacture, and commercialize in the U.S. products containing lesinurad as an active ingredient, or the Lesinurad License, including ZURAMPIC and DUZALLO^®.

During the years ended December 31, 2017 and 2016, we wrote down approximately $0.3 million and approximately $0.4 million, respectively, of prepaid ZURAMPIC commercial supply primarily as a result of revised demand forecasts.

(4) Amortization of acquired intangible assets was based on the economic consumption of intangible assets. Our amortization was related to the ZURAMPIC and DUZALLO intangible assets. (Gain) loss on fair value remeasurement of contingent consideration was related to our contingent consideration liability pursuant to our exclusive license to develop, manufacture, and commercialize products containing lesinurad as an active ingredient, including ZURAMPIC and DUZALLO, in the U.S. During the year ended December 31, 2018, we delivered to AstraZeneca a notice of termination of the lesinurad license agreement. As a result, we recorded an impairment charge of approximately $151.8 million due to the impairment of the ZURAMPIC and DUZALLO intangible assets. As a result, a gain on fair value remeasurement of contingent consideration of approximately $31.0 million was recorded during the year ended December 31, 2018.

(5) During the year ended December 31, 2019, we recorded a gain on lease modification of approximately $3.2 million related to the modification of our former headquarters lease.

(6) During the year ended December 31, 2020, we incurred approximately $15.4 million in restructuring expenses, primarily due to severance, benefits, and related costs associated with the September 2020 workforce reduction.

During the year ended December 31, 2019, we incurred approximately $3.6 million in restructuring expenses, primarily due to severance, benefits, and related costs associated with the February 2019 workforce reduction.

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During the year ended December 31, 2018, we incurred approximately $14.7 million in restructuring expenses, primarily due to severance, benefits, and related costs associated with the June 2018 and August 2018 workforce reductions.

(7) In June 2015, we issued 2.25% Convertible Senior Notes due June 15, 2022, or the 2022 Convertible Notes. In connection with the issuance of our 2022 Convertible Notes, we entered into convertible note hedge transactions, or the Convertible Note Hedges, and separate note hedge warrant transactions, or the Note Hedge Warrants, with certain financial institutions. Gain (loss) on derivatives consists of the change in fair value of the Convertible Note Hedges and Note Hedge Warrants, which are recorded at fair value at each reporting period and changes in fair value are recorded in our consolidated statements of operations.

(8) For the year ended December 31, 2019, we recorded a loss on extinguishment of debt of approximately $31.0 million due to the write-off of unamortized debt issuance costs and debt discount related to the partial repurchase of the 2022 Convertible Notes in August 2019 and the prepayment premium and write-off of the remaining unamortized debt issuance costs and debt discount on the 8.375% Notes due 2026 Notes, or the 2026 Notes, as part of the redemption of all of the outstanding principal amount of the 2026 Notes in September 2019.

For the year ended December 31, 2017, we recorded a loss on extinguishment of debt of approximately $2.0 million due to the write-off of remaining unamortized debt issuance costs on the 11% PhaRMA Notes due 2024 as part of the redemption in January 2017.

(9) For the year ended December 31, 2019, we recorded other income of approximately $0.5 million related to a transition services agreement with Cyclerion Therapeutics, Inc., or Cyclerion, in connection with the Separation.

	As of Year Ended December 31,
	2020		2019		2018		2017		2016
	(in thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents and available-for-sale securities	$	362,564	$	177,023	$	173,172	$	221,416		305,216
Working capital (excluding deferred revenue)		463,666		266,798		146,911		245,569		289,050
Assets of discontinued operations, including current portion(1)		—		—		10,490		7,256		6,097
Right-of-use assets(2)		16,576		17,743		—		—		—
Total assets		559,238		402,748		332,050		605,674		709,821
Current liabilities of discontinued operations(1)		—		—		15,739		9,997		6,618
Debt financing and convertible notes, including current portion(3)		430,256		407,994		413,692		396,091		366,492
Capital lease obligations, including current portion		—		—		231		4,077		6,309
Operating lease obligations, including current portion		23,446		23,228		—		—		—
Total liabilities		496,598		495,999		528,421		595,826		643,105
Total stockholders’ equity (deficit)		62,640		(93,251)		(196,371)		9,848		66,716

(1) During the year ended December 31, 2019, we completed the Separation. Assets and liabilities related to Cyclerion have been reclassified as assets and liabilities of discontinued operations for the periods presented.

(2) During the year ended December 31, 2019, we implemented Accounting Standards Codification Topic 842, Leases, or ASC 842. As a result, we recorded right-of-use assets and associated lease liabilities for operating leases on our consolidated balance sheet.

(3) In August 2019, we issued $200.0 million in aggregate principal amount of the 0.75% Convertible Senior Notes due 2024, or the 2024 Convertible Notes, and $200.0 million in aggregate principal amount of the 1.50% Convertible Senior Notes due 2026, or the 2026 Convertible Notes. We received net proceeds of approximately $391.0 million from the sale of the 2024 Convertible Notes and the 2026 Convertible Notes, after deducting fees and expenses of approximately $9.0 million. The proceeds from the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes were used to pay the cost of the associated capped call transactions, redeem all of the outstanding principal balance of the 2026 Notes, and repurchase $215.0 million aggregate principal amount of the 2022 Convertible Notes.

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Item 7.    Management’s Discussion and Analysis of Financial Condition and Results of Operations

Forward-Looking Information

The following discussion of our financial condition and results of operations should be read in conjunction with our consolidated financial statements and the notes to those financial statements appearing elsewhere in this Annual Report on Form 10-K. This discussion contains forward looking statements that involve significant risks and uncertainties. As a result of many factors, such as those set forth under “Risk Factors” in Item 1A of this Annual Report on Form 10 K, our actual results may differ materially from those anticipated in these forward-looking statements.

Discussion and analysis of our financial condition and results of operations for the fiscal year ended December 31, 2019 compared to the fiscal year ended December 31, 2018 is included in Part II, Item 7 –"Management's Discussion and Analysis of Financial Condition and Results of Operations" in our Annual Report on Form 10-K for the fiscal year ended December 31, 2019 filed with the Securities and Exchange Commission on February 13, 2020.

Overview

We are a gastrointestinal, or GI, healthcare company dedicated to advancing the treatment of GI diseases and redefining the standard of care for GI patients. We are focused on the development and commercialization of innovative GI product opportunities in areas of significant unmet need, leveraging our demonstrated expertise and capabilities in GI diseases.

LINZESS^® (linaclotide), our commercial product, is the first product approved by the United States Food and Drug Administration, or U.S. FDA, in a class of GI medicines called guanylate cyclase type C agonists and is indicated for adult men and women suffering from irritable bowel syndrome with constipation, or IBS-C, or chronic idiopathic constipation, or CIC. LINZESS is available to adult men and women suffering from IBS-C or CIC in the United States, or the U.S., and Mexico and to adult men and women suffering from IBS-C in Japan and China. Linaclotide is available under the trademarked name CONSTELLA^® to adult men and women suffering from IBS-C or CIC in Canada, and to adult men and women suffering from IBS-C in certain European countries.

We have strategic partnerships with leading pharmaceutical companies to support the development and commercialization of linaclotide throughout the world, including with AbbVie Inc. (together with its affiliates), or AbbVie, (successor to Allergan plc (together with its affiliates), or Allergan), in the U.S. and all countries worldwide other than China (including Hong Kong and Macau) and Japan, AstraZeneca AB (together with its affiliates), or AstraZeneca, in China (including Hong Kong and Macau) and Astellas Pharma Inc., or Astellas, in Japan. We also aim to leverage our leading capabilities in GI to bring additional treatment options to GI patients; for example, we have a U.S. disease education and promotional agreement with Alnylam Pharmaceuticals, Inc. for Alnylam’s GIVLAARI® (givosiran) for the treatment of acute hepatic porphyria.

To date, we have dedicated a majority of our activities to the research, development and commercialization of linaclotide, as well as to the research and development of our other product candidates. Prior to the year ended December 31, 2019, when we recorded net income for the year of approximately $21.5 million, we incurred net losses in each year since our inception in 1998. For the year ended December 31, 2020, we recorded net income of approximately $106.2 million. As of December 31, 2020, we had an accumulated deficit of approximately $1.5 billion. We are unable to predict the extent of any future losses or guarantee that our company will be able to maintain positive cash flows.

We were incorporated in Delaware on January 5, 1998 as Microbia, Inc. On April 7, 2008, we changed our name to Ironwood Pharmaceuticals, Inc. We operate in one reportable business segment—human therapeutics.

Key 2020 Financial Highlights

● During the year ended December 31, 2020, we recognized approximately $389.5 million in total revenues, compared to approximately $428.4 million during the year ended December 31, 2019. The decrease of 9% was primarily driven by a decrease in sale of active pharmaceutical ingredient, or API, in 2020 compared to 2019. An increase in collaborative arrangements revenue related to sales of LINZESS in the U.S. of approximately $43.2 million in 2020 compared to 2019 was offset by approximately $42.4 million in non-

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recurring revenue recognized in 2019 in connection with amendments to our collaborative arrangements with AstraZeneca and Astellas.

● During the year ended December 31, 2020, we recognized approximately $368.6 million in collaborative arrangements revenue related to sales of LINZESS in the U.S. compared to approximately $325.4 million during the year ended December 31, 2019. The increase of 13% was primarily driven by an increase in LINZESS prescription demand in the U.S. in 2020 compared to 2019.

● Our operations resulted in net income of approximately $106.2 million during the year ended December 31, 2020 compared to net income of $21.5 million during the year ended December 31, 2019, primarily driven by increased revenue from sales of LINZESS in the U.S., as well as decreases in costs primarily associated with the discontinuation of MD-7246 and IW-3718 development programs.

● We generated $168.8 million in cash from operations during the year ended December 31, 2020, ending the year with $362.6 million in cash and cash equivalents.

● In connection with our decision to discontinue development of IW-3718, we reduced our workforce by approximately 100 full-time employees. We substantially completed the reduction in our workforce in the fourth quarter of 2020. We expect to realize annualized cost savings in total operating expenses from this workforce reduction, as well as cost savings related to external spend for IW-3718 previously expected through 2021.

Financial Operations Overview

Revenues. Our revenues are generated primarily through our collaborative arrangements and license agreements related to research and development and commercialization of linaclotide, as well as co-promotion arrangements in the U.S.

The majority of our revenues are generated from the sales of LINZESS in the U.S. We record our share of the net profits and losses from the sales of LINZESS in the U.S. on a net basis and present the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. Net profits or losses consist of net sales to third-party customers and sublicense income in the U.S. less the cost of goods sold as well as selling, general and administrative expenses. Although we expect net sales to increase over time, the settlement payments between AbbVie and us, resulting in collaborative arrangements revenue or collaboration expense, are subject to fluctuation based on the ratio of selling, general and administrative expenses incurred by each party. In addition, our collaborative arrangements revenue may fluctuate as a result of the timing and amount of license fees and clinical and commercial milestones received and recognized under our current and future strategic partnerships as well as timing and amount of royalties from the sales of linaclotide in the European, Canadian or Mexican markets or any other markets where linaclotide receives approval.

Product revenue consisted of sales of ZURAMPIC ^® and DUZALLO ^®, or the Lesinurad Products, in the U.S. through the date of the termination in January 2019 of our exclusive license to develop, manufacture, and commercialize in the U.S. products containing lesinurad as an active ingredient, or the Lesinurad License. Through December 31, 2020, we also generated revenues from the manufacture of linaclotide finished drug product, finished goods, API and development materials for certain of our partners.

Cost of Revenues. Cost of revenues primarily includes costs related to the sales of linaclotide API, finished drug product, and finished goods to our partners, which generally occurs upon shipment for sales of API, finished drug product and finished goods after the material has passed all quality testing required for acceptance by the partner to certain of our partners outside of the U.S.

Settlement on Non-cancelable Inventory and Commercial Supply Purchase Commitments. During the year ended December 31, 2019, we recorded settlements related to reversals of certain previously accrued non-cancelable purchase commitments.

Research and Development Expense. The core of our research and development strategy is to leverage our demonstrated expertise and capabilities in GI diseases to bring multiple medicines to patients. Research and

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development expense consists of expenses incurred in connection with the research into and development of product candidates. These expenses consist primarily of compensation, benefits and other employee-related expenses, research and development related facility costs, third-party contract costs relating to nonclinical study and clinical trial activities, development of manufacturing processes, regulatory registration of third-party manufacturing facilities, and licensing fees for our product candidates. We record all research and development expenses as incurred.

Research and development expenses include amounts owed to AbbVie on an ongoing basis, as well as AstraZeneca prior to September 2019 when we amended and restated our existing collaboration agreement with AstraZeneca, or the Amended AstraZeneca Agreement, under cost-sharing provisions in our respective collaboration agreements for linaclotide. Reimbursements received for research and development activities under these agreements were netted against research and development expenses.

Linaclotide. Our commercial product, linaclotide, is available to adult men and women suffering from IBS-C or CIC in certain countries around the world. LINZESS is commercially available in the U.S. for the treatment of IBS-C or CIC in adults. Linaclotide also is approved and commercially available in China, Japan, and in a number of E.U. and other countries.

We and AbbVie continue to explore ways to enhance the clinical profile of LINZESS by studying linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions. In January 2017, the U.S. FDA approved a 72 mcg dose of LINZESS for adults with CIC, which became available in the U.S. in March 2017. In June 2019, we announced positive topline data from our Phase IIIb trial demonstrating the efficacy and safety of linaclotide 290 mcg on the overall abdominal symptoms of bloating, pain and discomfort in adult patients with IBS-C. In September 2020, based on the Phase IIIb data, the U.S. FDA approved our Supplemental New Drug Application to include a more comprehensive description of the effects of LINZESS in its approved label.

In connection with the U.S. FDA approval of LINZESS, we were required to conduct certain nonclinical and clinical studies including those aimed at further understanding the safety profile of linaclotide. We and AbbVie completed such additional studies and determined that: (a) orally administered linaclotide was not detected in breast milk, (b) there is little or no evidence of any potential for antibodies to be developed to linaclotide, and (c) there were no signs or symptoms of an immunogenic response to linaclotide. The results observed do not alter the known safety profile for linaclotide based on the clinical studies and post-marketing experience to-date. In addition, we and AbbVie have established a nonclinical and clinical post-marketing plan with the U.S. FDA to understand the safety and efficacy of LINZESS in pediatric patients. Clinical pediatric programs in IBS-C and functional constipation are ongoing.

MD-7246. We and AbbVie were developing MD-7246, a delayed release formulation of linaclotide. In May 2020, we and AbbVie announced top-line data from a Phase II trial evaluating MD-7246 in adult patients with abdominal pain associated with IBS-D. The Phase II trial did not meet its primary or key secondary endpoints. Based on these findings, we and AbbVie discontinued the development of MD-7246.

IW-3718. We were developing IW-3718, a gastric retentive formulation of a bile acid sequestrant, for the potential treatment of refractory gastroesophageal reflux disease, or refractory GERD. In September 2020, we announced that one of our two identical Phase III trials evaluating IW-3718 in refractory GERD did not meet the pre-specified criteria associated with a planned early efficacy assessment. Following the assessment from an independent data monitoring committee, we unblinded the data and confirmed that IW-3718-302 did not meet the criteria, including the study’s primary endpoint of achieving a statistically significant improvement in heartburn severity. Based on these findings, we are discontinuing development of IW-3718.

Early research and development. Our early research and development efforts have been focused on supporting our development stage GI programs, including exploring strategic options for further development of certain of our internal programs. Included in early research and development are costs relating to the development of IW-3300, a GC-C agonist, which is in pre-clinical development for the potential treatment of visceral pain conditions, as well as certain other expenses associated with historical programs.

The following table sets forth our research and development expenses related to our product pipeline for the years ended December 31, 2020, 2019, and 2018. These expenses relate primarily to internal compensation, benefits and other employee-related expenses and external costs associated with nonclinical studies and clinical trial costs for our

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product candidates. We allocate costs related to facilities, depreciation, share-based compensation, research and development support services, laboratory supplies and certain other costs directly to programs.

	Year Ended December 31,
	2020		2019		2018
	(in thousands)
Linaclotide(1)	$	25,531	$	39,061	$	33,749
Lesinurad(2)		—		524		5,184
IW-3718		52,183		65,771		37,789
Early research and development		10,348		9,688		24,338
Total research and development expenses	$	88,062	$	115,044	$	101,060

(1) Includes linaclotide in all indications, populations and formulations.

(2) Includes lesinurad in all indications, populations and formulations.

Since 2004, the date we began tracking costs by program, we have incurred approximately $527.2 million of research and development expenses related to linaclotide. The expenses for linaclotide include both our portion of the research and development costs incurred by AbbVie for the U.S. and AstraZeneca for China (including Hong Kong and Macau) prior to the execution of the Amended AstraZeneca Agreement, and invoiced to us under the cost-sharing provisions of our collaboration agreements, as well as the unreimbursed portion of research and development costs incurred by us under such cost-sharing provisions.

The lengthy process of securing regulatory approvals for new drugs requires the expenditure of substantial resources. Any failure by us to obtain, or any delay in obtaining, regulatory approvals would materially adversely affect our product development efforts and our business overall.

We and AbbVie are exploring development opportunities to enhance the clinical profile of LINZESS by studying linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions. We cannot currently estimate with any degree of certainty the amount of time or money that we will be required to expend in the future on linaclotide for other geographic markets within IBS-C and CIC, or in additional indications, populations or formulations.

Given the inherent uncertainties that come with the development of pharmaceutical products, we cannot estimate with any degree of certainty how our programs will evolve, and therefore the amount of time or money that would be required to obtain regulatory approval to market them.

As a result of these uncertainties surrounding the timing and outcome of any approvals, we are currently unable to estimate precisely when, if ever, linaclotide’s utility will be expanded within its currently approved indications; if or when linaclotide will be developed outside of its current markets, indications, populations or formulations; or when, if ever, any of our other product candidates will generate revenues and cash flows.

We invest carefully in our pipeline, and the commitment of funding for each subsequent stage of our development programs is dependent upon the receipt of clear, supportive data. In addition, we intend to access externally discovered drug candidates that fit within our core strategy. In evaluating these potential assets, we apply the same investment criteria as those used for investments in internally discovered assets.

The successful development of our product candidates is highly uncertain and subject to a number of risks including, but not limited to:

● The duration of clinical trials may vary substantially according to the type, complexity and novelty of the product candidate;

● The U.S. FDA and comparable agencies in foreign countries impose substantial and varying requirements on the introduction of therapeutic pharmaceutical products, typically requiring lengthy and detailed laboratory and clinical testing procedures, sampling activities and other costly and time-consuming procedures;

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● Data obtained from nonclinical and clinical activities at any step in the testing process may be adverse and lead to discontinuation or redirection of development activity. Data obtained from these activities also are susceptible to varying interpretations, which could delay, limit or prevent regulatory approval;

● The duration and cost of early research and development, including nonclinical studies and clinical trials may vary significantly over the life of a product candidate and are difficult to predict;

● The costs, timing and outcome of regulatory review of a product candidate may not be favorable, and, even if approved, a product may face post-approval development and regulatory requirements;

● There may be substantial costs, delays and difficulties in successfully integrating externally developed product candidates into our business operations; and

● The emergence of competing technologies and products and other adverse market developments may negatively impact us.

As a result of the factors discussed above, including the factors discussed under “Risk Factors” in Item 1A of this Annual Report on Form 10-K, we are unable to determine the duration and costs to complete current or future nonclinical and clinical stages of our product candidates or when, or to what extent, we will generate revenues from the commercialization and sale of our product candidates. Development timelines, probability of success and development costs vary widely. We anticipate that we will make determinations as to which additional programs to pursue and how much funding to direct to each program on an ongoing basis in response to the data of each product candidate, the competitive landscape and ongoing assessments of such product candidate’s commercial potential.

We expect to invest in our development programs for the foreseeable future. We will continue to invest in linaclotide, including the investigation of ways to enhance the clinical profile within its currently approved indications, and the exploration of its potential utility in other indications, populations and formulations. We will continue to invest in our GI-focused product candidates as we advance them through pre-clinical and clinical trials, in addition to funding research and development activities under our external collaboration and license agreements.

Selling, General and Administrative Expense. Selling, general and administrative expense consists primarily of compensation, benefits and other employee-related expenses for personnel in our administrative, finance, legal, information technology, business development, commercial, sales, marketing, communications and human resource functions. Other costs include legal costs of pursuing patent protection of our intellectual property, general and administrative related facility costs, insurance costs and professional fees for accounting, tax, consulting, legal and other services. As we continue to invest in the commercialization of LINZESS, we expect our selling, general and administrative expenses will be substantial for the foreseeable future. We record all selling, general and administrative expenses as incurred.

Prior to the execution of the Amended AstraZeneca Agreement, we were reimbursed for certain selling, general and administrative expenses and netted these reimbursements against selling, general and administrative expenses as incurred. AstraZeneca is responsible for all costs and expenses incurred under the Amended AstraZeneca Agreement. We include AbbVie’s selling, general and administrative cost-sharing payments in the calculation of the net profits and net losses from the sale of LINZESS in the U.S. and present the net payment to or from AbbVie as collaboration expense or collaborative arrangements revenue, respectively.

Gain on Lease Modification. During the year ended December 31, 2019, we recorded a gain on lease modification related to a modification of our prior headquarters lease in April 2019. For additional information relating to the gain, see Note 8, Leases, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Restructuring Expenses. Restructuring expenses pertain to workforce reduction and restructuring initiatives and are more fully described in Note 18, Workforce Reduction and Restructuring, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K. We substantially completed a workforce reduction related to discontinuing development of IW-3718 in the fourth quarter of 2020 and incurred approximately $15.5 million of restructuring expenses, primarily for one-time cash employee severance and benefit costs.

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Interest Expense. Interest expense consists primarily of cash and non-cash interest costs related to the convertible senior notes. Non-cash interest expense consists of amortization of the debt discount and debt issuance costs associated with our convertible senior notes.

Interest and Investment Income. Interest and investment income consists of interest earned on our cash, cash equivalents and marketable securities as well as significant financing components of payments due from collaboration partners.

Gain (loss) on Derivatives. In June 2015, we issued 2.25% Convertible Senior Notes due June 15, 2022, or the 2022 Convertible Notes, and in August 2019, we issued 0.75% Convertible Senior Notes due 2024, or the 2024 Convertible Notes, and 1.50% Convertible Senior Notes due 2026, or the 2026 Convertible Notes (together with the 2022 Convertible Notes and the 2024 Convertible Notes, the Convertible Senior Notes). In connection with the issuance of our 2022 Convertible Notes, we entered into convertible note hedge transactions, or the Convertible Note Hedges, and separate note hedge warrant transactions, or the Note Hedge Warrants, with certain financial institutions. Gain (loss) on derivatives consists of the change in fair value of the Convertible Note Hedges and Note Hedge Warrants, which are recorded at fair value at each reporting period and changes in fair value are recorded in our consolidated statements of operations. The Convertible Note Hedges and Note Hedge Warrants are more fully described in Note 11, Notes Payable, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Loss on Extinguishment of Debt. We recognized a loss on extinguishment of debt during the year ended December 31, 2019 related to the redemption of the 8.375% Notes due 2026, or the 2026 Notes, and the partial repurchase of the 2022 Convertible Notes. In connection with the partial repurchase of the 2022 Convertible Notes, we also terminated the respective portion of our existing Convertible Note Hedges and Note Hedge Warrants. These transactions are more fully described in Note 11, Notes Payable, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Income Taxes. We prepare our income tax provision based on our interpretation of the income tax accounting rules and each jurisdiction’s enacted tax laws and regulations and record our income tax provision by applying our estimated annual effective tax rate to pre-tax income. The difference between the recorded provision for income taxes and the income tax provision based on U.S. statutory tax rates was primarily attributable to the impact of a continued valuation allowance.

Discontinued Operations. On April 1, 2019, we completed the separation, or the Separation, of our soluble guanylate cyclase, or sGC, business, and certain other assets and liabilities, into a separate, independent publicly traded company, Cyclerion Therapeutics, Inc., or Cyclerion. The Separation was effected by means of a distribution of all the outstanding shares of common stock, with no par value, of Cyclerion, through a dividend of Cyclerion’s common stock to our stockholders of record as of the close of business on March 19, 2019. In connection with the Separation, we recast all historical expenses directly associated with our sGC business as discontinued operations for the years ended December 31, 2019 and 2018 in accordance with ASC Subtopic 250-20, Discontinued Operations. For additional information refer to Note 3, Cyclerion Separation, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Critical Accounting Policies and Estimates

Our discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements prepared in accordance with U.S. generally accepted accounting principles. The preparation of these financial statements requires us to make certain estimates and assumptions that may affect the reported amounts of assets and liabilities, the disclosure of assets and liabilities at the date of the consolidated financial statements, and the reported amounts of revenues and expenses during the reported periods. We base our estimates on our historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ materially from our estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

We believe that our application of the following accounting policies, each of which require significant judgments and estimates on the part of management, are the most critical to aid in fully understanding and evaluating our

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reported financial results. Our significant accounting policies are more fully described in Note 2, Summary of Significant Accounting Policies, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Leases

Effective January 1, 2019, we adopted ASC Topic 842, Leases, or ASC 842, using the optional transition method. The adoption of ASC 842 represents a change in accounting principle that aims to increase transparency and comparability among organizations by requiring the recognition of right-of-use, assets and lease liabilities on the balance sheet for both operating and finance leases. In addition, the standard requires enhanced disclosures that meet the objective of enabling financial statement users to assess the amount, timing, and uncertainty of cash flows arising from leases.

As part of the ASC 842 adoption, we elected certain practical expedients, which include:

● A policy election to use the short-term lease exception by asset class; and

● Election of the practical expedient package during transition, which includes:

o An entity need not reassess whether any expired or existing contracts are or contain leases.

o An entity need not reassess the classification for any expired or existing leases. As a result, all leases that were previously classified as operating leases in accordance with ASC Topic 840, Leases, or ASC 840, are classified as operating leases under ASC 842, and all leases that were classified as capital leases in accordance with ASC 840 are classified as finance leases under ASC 842.

o An entity need not reassess initial direct costs for any existing leases.

Subsequent to our adoption of ASC 842, we elected the post-transition practical expedient, by class of underlying asset, to account for lease components and non-lease components together as a single component for the asset class of operating lease right-of-use real estate assets.

Our lease portfolio for the year ended December 31, 2020 includes: a lease for our headquarters location, a data center colocation lease, vehicle leases for our salesforce representatives, and leases for computer and office equipment. We determine if an arrangement is a lease at the inception of the contract. The asset component of our operating leases is recorded as the operating lease right-of-use asset, and the liability component is recorded as the current portion of operating lease liabilities and operating lease liabilities, net of current portion in our consolidated balance sheet. As of December 31, 2020, we did not record any finance leases.

Right-of-use assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the lease inception date. Existing leases in our lease portfolio as of the adoption date were valued as of January 1, 2019. We use an incremental borrowing rate based on the information available at lease inception in determining the present value of lease payments if an implicit rate of return is not provided with the lease contract. Operating lease right-of-use assets are adjusted for incentives expected to be received.

Right-of-use assets and operating lease liabilities are remeasured upon certain modifications to leases using the present value of remaining lease payments and estimated incremental borrowing rate upon lease modification.

Lease cost is recognized on a straight-line basis over the lease term, and includes amounts related to short-term leases. We recognize variable lease payments as operating expenses in the period in which the obligation for those payments is incurred. Variable lease payments primarily include common area maintenance, utilities, real estate taxes, insurance, and other operating costs that are passed on from the lessor in proportion to the space leased by us.

Derivative Assets and Liabilities

In June 2015, in connection with the issuance of the 2022 Convertible Notes, we entered into the Convertible Note Hedges. Concurrently with entering into the Convertible Note Hedges, we also entered into certain warrant transactions in which we sold Note Hedge Warrants to the Convertible Note Hedge counterparties to acquire shares of

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our Class A Common Stock, subject to customary anti-dilution adjustments. In connection with the partial repurchase of the 2022 Convertible Notes in August 2019, we terminated our Convertible Note Hedges and Note Hedge Warrants proportionately.

These derivatives are recorded as assets or liabilities at fair value at the end of each reporting period and the fair value is determined using the Black-Scholes option-pricing model. The changes in fair value are recorded as a component of other (expense) income in the consolidated statements of operations. Significant inputs used to determine the fair value include the price per share of our Class A Common Stock on the date of valuation, expected term of the derivative instruments, the strike prices of the derivative instruments, the risk-free interest rate, and the expected volatility of our Class A Common Stock. Changes to these inputs could materially affect the valuation of the Convertible Note Hedges and Note Hedge Warrants in future periods.

Revenue Recognition

Upon executing a revenue generating arrangement, we assess whether it is probable we will collect consideration in exchange for the good or service it transfers to the customer and perform the following five steps: (i) identify the contract(s) with a customer; (ii) identify the performance obligations in the contract; (iii) determine the transaction price; (iv) allocate the transaction price to the performance obligations in the contract; and (v) recognize revenue when (or as) we satisfy the performance obligations. We must develop assumptions that require significant judgment to determine the standalone selling price for each performance obligation identified in the contract. The assumptions that are used to determine the standalone selling price may include forecasted revenues, development timelines, reimbursement rates for personnel costs, discount rates and probabilities of technical and regulatory success.

Our revenues are generated primarily through collaborative arrangements and license agreements related to the development and commercialization of linaclotide, as well as co-promotion arrangements in the U.S. The terms of the collaborative arrangements and other agreements contain multiple performance obligations which may include (i) licenses, (ii) research and development activities, including participation on joint steering committees, (iii) the manufacture of finished drug product, API, or development materials for a partner, which are reimbursed at a contractually determined rate, and (iv) education or co-promotion activities by our clinical sales specialists. Non-refundable payments to us under these agreements may include (i) up-front license fees, (ii) payments for research and development activities, (iii) payments for the manufacture of finished drug product, API, or development materials, (iv) payments based upon the achievement of certain milestones, (v) payments for sales detailing, promotional support services and medical education initiatives, and (vi) royalties on product sales. Additionally, we receive our share of the net profits or bear our share of the net losses from the sale of linaclotide in the U.S. We have adopted a policy to recognize revenue net of tax withholdings, as applicable.

Collaboration, License, Co-Promotion and Other Commercial Agreements

Upon licensing intellectual property, we determine if the license is distinct from the other performance obligations identified in the arrangement. We recognize revenues from the transaction price, including non-refundable, up-front fees allocated to the license when the license is transferred to the customer if the license has distinct benefit to the customer. For licenses that are combined with other promises, we assess the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time. For performance obligations that are satisfied over time, we evaluate the measure of progress each reporting period and, if necessary, adjust the measure of performance and related revenue recognition.

Our license and collaboration agreements include milestone payments, such as development and other milestones. We evaluate whether the milestones are considered probable of being reached and estimate the amount to be included in the transaction price using the most likely amount method at the inception of the agreement. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within our control, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is then allocated to each performance obligation on a relative standalone selling price basis, for which we recognize revenue as or when the performance obligations under the contract are satisfied. We re-evaluate the probability of achievement of such milestones and any related constraint at each reporting period, and any adjustments are recorded on a cumulative catch-up basis.

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Agreements that include the supply of API or drug product for either clinical development or commercial supply at the customer’s discretion are generally considered as options. We assess if these options provide a material right to our partner, and if so, they are accounted for as separate performance obligations. If we are entitled to additional payments when the customer exercises these options, any additional payments are recorded as revenue when the customer obtains control of the goods, which is typically upon shipment for sales of API and finished drug product.

For agreements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, we recognize revenue when the related sales occur.

Net Profit or Net Loss Sharing

In accordance with ASC 808 Topic, Collaborative Arrangements, or ASC 808, we considered the nature and contractual terms of the arrangement and the nature of our business operations to determine the classification of payments under our collaboration agreements. While ASC 808 provides guidance on classification, the standard is silent on matters of separation, initial measurement, and recognition. Therefore, we apply the separation, initial measurement, and recognition principles of ASC Topic 606, Revenue from Contracts with Customers, or ASC 606, to our collaboration agreements.

Our collaborative arrangements revenue generated from sales of LINZESS in the U.S. are considered akin to sales-based royalties. We recognize our share of the pre-tax commercial net profit or net loss generated from the sales of LINZESS in the U.S. in the period the product sales are earned, as reported by AbbVie, and related cost of goods sold and selling, general and administrative expenses as incurred by us and our collaboration partner. These amounts are partially determined based on amounts provided by AbbVie and involve the use of estimates and judgments, such as product sales allowances and accruals related to prompt payment discounts, chargebacks, governmental and contractual rebates, wholesaler fees, product returns, and co-payment assistance costs, which could be adjusted based on actual results in the future. We are highly dependent on AbbVie for timely and accurate information regarding any net revenues realized from sales of LINZESS in the U.S. in accordance with ASC 808, and the related costs, in order to accurately report its results of operations. If we do not receive timely and accurate information or incorrectly estimate activity levels associated with the collaboration at a given point in time, we could be required to record adjustments in future periods.

We record revenue transactions as net product revenue in our consolidated statements of operations if we were deemed the principal in the transaction, which includes being the primary obligor, retaining inventory risk, and control over pricing. Given that we are not the primary obligor and do not have the inventory risks in the collaboration agreement with AbbVie for North America, we record our share of the net profits or net losses from the sales of LINZESS in the U.S. on a net basis and present the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. We and AbbVie settle the cost sharing quarterly, such that our consolidated statements of operations reflect 50% of the pre-tax net profit or loss generated from sales of LINZESS in the U.S.

Product Revenue, Net

Product revenue consisted of sales of the Lesinurad Products in the U.S. through the date of the termination of the Lesinurad License in January 2019. We sold the Lesinurad Products principally to a limited number of national wholesalers and selected regional wholesalers, or the Distributors. The Distributors resold the Lesinurad Products to retail pharmacies and healthcare providers, who then sold to patients.

Net product revenue was recognized when the Distributor obtained control of our product, which occurred at a point in time, typically upon shipment of Lesinurad Products to the Distributor. When we performed shipping and handling activities after the transfer of control to the Distributor (e.g., when control transferred prior to delivery), they were considered fulfillment activities, and accordingly, the costs were accrued for when the related revenue was recognized. We expensed incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that we would have recognized was one year or less.

Product revenue was recorded net of the trade discounts, allowances, rebates, chargebacks, discounts, product returns, and other incentives. Certain of these adjustments were recorded as an accounts receivable reserve, while certain of these adjustments were recorded as accrued expenses.

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Sale of Active Pharmaceutical Ingredient

During the years ended December 31, 2020, 2019, and 2018, we produced linaclotide API, finished drug product, finished goods, and/or development materials for certain of our partners. As of December 31, 2020, we are no longer responsible for the supply of linaclotide API, finished drug product, finished goods or development materials to our partners.

As it relates to development materials and API produced for Astellas, we were reimbursed at a contracted rate. Such reimbursements were considered as part of revenue generated pursuant to the Astellas license agreement and are presented as collaborative arrangements revenue. Any linaclotide API, finished drug product, finished goods, and development materials AbbVie is responsible for producing for the U.S. are recognized in accordance with the cost-sharing provisions of the collaboration agreement for North America with AbbVie. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, any linaclotide API, finished drug product, finished goods, and development materials produced for AstraZeneca for China (including Hong Kong and Macau) were recognized in accordance with the cost-sharing provisions of the AstraZeneca collaboration agreement.

We recognize revenue on linaclotide API, finished drug product, finished goods, and development materials when control has transferred to the partner, which generally occurs upon shipment after the material has passed all quality testing required for acceptance by the partner.

Other

Our deferred revenue balance consists of advance billings and payments received from customers in excess of revenue recognized.

Research and Development Expense

We have committed significant resources into the research and development of our product candidates and intend to continue to do so for the foreseeable future. All research and development expenses are expensed as incurred. We capitalize nonrefundable advance payments we make for research and development activities and defer expense recognition until the related goods are received or the related services are performed.

Research and development expenses are comprised of costs incurred in performing research and development activities, including salary, benefits, share-based compensation, and other employee-related expenses; laboratory supplies and other direct expenses; facilities expenses; overhead expenses; third-party contractual costs relating to nonclinical studies and clinical trial activities and related contract manufacturing expenses, development of manufacturing processes and regulatory registration of third-party manufacturing facilities; licensing fees for our product candidates; and other outside expenses.

Clinical trial expenses include expenses associated with contract research organizations, or CROs. The invoicing from CROs for services rendered can lag several months. We accrue the cost of services rendered in connection with CRO activities based on our estimate of site management, monitoring costs, project management costs, and investigator fees. We maintain regular communication with our CRO vendors to gauge the reasonableness of our estimates. Differences between actual clinical trial expenses and estimated clinical trial expenses recorded have not been material and are adjusted for in the period in which they become known. However, if we incorrectly estimate activity levels associated with the CRO services at a given point in time, we could be required to record material adjustments in future periods. Under our collaboration agreement with AbbVie for North America, we are reimbursed for certain research and development expenses and we net these reimbursements against our research and development expenses as incurred. Amounts owed to AbbVie under our collaboration agreement are recorded as incremental research and development expense. Nonrefundable advance payments for research and development activities are capitalized and expensed over the related service period or as goods are received.

Share-Based Compensation Expense

We grant awards under our share-based compensation programs, including stock awards, restricted stock awards, or RSAs, restricted stock units, or RSUs (including performance-based RSUs, or PSUs), stock options, and shares issued under our employee stock purchase plan, or ESPP. Share-based compensation is recognized as expense in

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the consolidated statements of operations based on the grant date fair value over the requisite service period, net of estimated forfeitures. We estimate forfeitures over the requisite service period using historical forfeiture activity and record share-based compensation expense only for those awards that are expected to vest.

We estimate the fair value of stock options on the date of grant using the Black-Scholes option-pricing model, which requires the use of subjective assumptions including volatility and expected term, among others. The fair value of stock awards, RSAs, and RSUs is based on the market value of our Class A Common Stock on the date of grant, with the exception of PSUs with market conditions, which are measured using the Monte Carlo simulation method. Discounted stock purchases under our ESPP are valued on the first date of the offering period using the Black-Scholes option-pricing model to compute the fair value of the lookback provision plus the purchase discount.

For awards that vest based on service conditions and market conditions, we use the straight-line method to recognize compensation expense over the respective service period. For awards that contain performance conditions, we determine the appropriate amount to expense based on the anticipated achievement of performance targets, which requires judgment, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, we record a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, we re-assess the estimated performance and update the number of performance-based awards that we believe will ultimately vest. Discounted stock purchases under our ESPP are recognized over the offering period.

Compensation expense related to modified awards is measured based on the fair value for the awards as of the modification date. Any incremental compensation expense arising from the excess of the fair value of the awards on the modification date compared to the fair value of the awards immediately before the modification date is recognized at the modification date or ratably over the requisite remaining service period, as appropriate.

While the assumptions used to calculate and account for share-based compensation awards represent management’s best estimates, these estimates involve inherent uncertainties and the application of management’s judgment. As a result, if revisions are made to our underlying assumptions and estimates, our share-based compensation expense could vary significantly from period to period.

Income Taxes

We utilize the asset and liability method of accounting for income taxes. Under this method, deferred tax assets and liabilities are determined based on the difference between the financial statement carrying amounts and tax basis of assets and liabilities using enacted tax rates in effect for years in which the temporary differences are expected to reverse. We provide a valuation allowance when it is more likely than not that deferred tax assets will not be realized.

We maintain a valuation allowance on the majority of our net operating losses and other deferred tax assets. Accordingly, we have not reported any tax benefit relating to the remaining net operating loss carryforwards and income tax credit carryforwards that are available for utilization in future periods. Our U.S. federal net operating loss carryforwards totaled approximately $1.1 billion as of December 31, 2020. On a periodic basis, we reassess the valuation allowance on our deferred income tax assets, weighing positive and negative evidence to assess the recoverability of the deferred tax assets. In 2020, we reassessed the valuation allowance and considered negative evidence, including our cumulative losses in recent years and our plan to build our innovative GI pipeline through potential acquisition or in-licensing externally developed products, and positive evidence, including our income during the year ended December 31, 2020 and our projections of future income. After assessing both the negative evidence and the positive evidence, we concluded that we should continue to maintain the valuation allowance on net deferred tax assets as of December 31, 2020 given the significance of the weight of the negative evidence. Based on our recent financial performance and our future projections, we could record a reversal of all, or a portion of the valuation allowance associated with U.S. deferred tax assets in future periods. However, any such change is subject to actual performance and other considerations that may present positive or negative evidence at the time of the assessment. Our total deferred tax asset balance subject to the valuation allowance was approximately $395.0 million as of December 31, 2020.

Significant judgment is required in making these assessments to maintain or reverse our valuation allowances and, to the extent our future expectations change we would have to assess the recoverability of these deferred tax assets at that time. If we determine that our net deferred tax assets are realizable in a future period, we would record material changes to income tax expense or benefit in that period.

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We record uncertain tax positions on the basis of a two-step process. First, we determine whether it is more likely than not that the tax positions will be sustained based on the technical merits of the position. Second, for those tax positions that meet the more-likely-than-not recognition threshold, we recognize the largest amount of tax benefit that is greater than 50 percent likely to be realized upon ultimate settlement with the relevant tax authority. Significant judgment is required in evaluating whether our tax positions meet this two-step process. The nature of the uncertain tax positions is often very complex and subject to change, and the amounts at issue can be substantial. We re-evaluate these uncertain tax positions on a quarterly basis based on a number of factors including, but not limited to, changes in facts or circumstances, changes in tax law, and effectively settled issues under audit and new audit activity. Any change in these factors could result in the recognition of a tax benefit or an additional charge to the tax provision.

Results of Operations

The following discussion summarizes the key factors our management believes are necessary for an understanding of our consolidated financial statements.

	Year Ended December 31,
	2020		2019
	(in thousands)
Revenues:
Collaborative arrangements revenue	$	381,545	$	379,652
Sale of active pharmaceutical ingredient		7,978		48,761
Total revenues		389,523		428,413
Cost and expenses:
Cost of revenues		3,136		23,875
Settlement on non-cancellable purchase commitments		—		(3,530)
Research and development		88,062		115,044
Selling, general and administrative		140,003		172,450
Amortization of acquired intangible assets		—		—
Gain on fair value remeasurement of contingent consideration		—		—
Gain on lease modification		—		(3,169)
Restructuring expenses		15,382		3,620
Impairment of intangible assets		—		—
Total cost and expenses		246,583		308,290
Income from operations		142,940		120,123
Other (expense) income:
Interest expense		(29,478)		(36,602)
Interest and investment income		1,504		2,862
Gain (loss) on derivatives		(6,129)		3,023
Loss on extinguishment of debt		—		(30,977)
Other income		24		514
Other expense, net		(34,079)		(61,180)
Income from continuing operations, before income tax expense		108,861		58,943
Income tax expense		2,685		—
Income from continuing operations		106,176		58,943
Loss from discontinued operations, net of income taxes		—		(37,438)
Net income	$	106,176	$	21,505

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Year Ended December 31, 2020 Compared to Year Ended December 31, 2019

Revenues

	Year Ended
	December 31,				Change
	2020		2019		$		%
	(dollars in thousands)
Revenues:
Collaborative arrangements revenue	$	381,545	$	379,652	$	1,893	0	%
Sale of active pharmaceutical ingredient		7,978		48,761		(40,783)	(84)	%
Total revenues	$	389,523	$	428,413	$	(38,890)	(9)	%

Collaborative arrangements revenue. The increase in revenue from collaborative arrangements of approximately $1.9 million for the year ended December 31, 2020 compared to the year ended December 31, 2019 was primarily related to an approximately $43.2 million increase in our share of the net profits from the sale of LINZESS in the U.S. driven by increased prescription demand and lower collaboration-related selling expenses due to the COVID-19 pandemic and an approximately $3.6 million increase in linaclotide royalty revenue. These increases were offset by an approximately $32.4 million decrease in revenue related to non-contingent payments pursuant to the Amended AstraZeneca Agreement and recognized in 2019; an approximately $10.0 million decrease in revenue recognized related to a one-time up-front payment received in 2019 in connection with the amendment and restatement of our license agreement with Astellas for linaclotide in Japan, or the Amended Astellas License Agreement; and an approximately $2.2 million decrease in co-promotion revenue.

Sale of active pharmaceutical ingredient. The decrease in sale of API of approximately $40.8 million for the year ended December 31, 2020 compared to the year ended December 31, 2019 was primarily related to a decrease of approximately $43.8 million in sales of API to Astellas in Japan, resulting from the transition of manufacturing responsibilities to Astellas in connection with the Amended Astellas License Agreement executed in August 2019. This decrease was partially offset by an approximately $2.6 million increase in sales of API, finished drug product, and finished goods to AstraZeneca in China. Substantively all sales of API, finished drug product, and finished goods to AstraZeneca in China occurred during the three months ended March 31, 2020 in connection with the transition of manufacturing responsibilities to AstraZeneca under the terms of the Amended AstraZeneca Agreement.

Cost and Expenses

	Year Ended
	December 31,				Change
	2020		2019		$		%
	(dollars in thousands)
Cost and expenses:
Cost of revenues	$	3,136	$	23,875	$	(20,739)	(87)	%
Settlement on non-cancellable purchase commitments		—		(3,530)		3,530	(100)	%
Research and development		88,062		115,044		(26,982)	(23)	%
Selling, general and administrative		140,003		172,450		(32,447)	(19)	%
Gain on lease modification		—		(3,169)		3,169	(100)	%
Restructuring expenses		15,382		3,620		11,762	325	%
Total cost and expenses	$	246,583	$	308,290	$	(61,707)	(20)	%

Cost of revenues. The decrease of approximately $20.7 million for the year ended December 31, 2020 compared to the year ended December 31, 2019 was comprised of a decrease in cost of revenues of approximately $20.1 million related to the sale of API to Astellas in Japan and a decrease in cost of revenues of approximately $0.5 million related to the sale of API, finished drug product, and finished goods to AstraZeneca in China, concurrent with the decrease in revenue from the sale of API to Astellas and AstraZeneca, respectively.

Settlement on non-cancellable purchase commitments. The settlement of certain commercial supply purchase commitments occurred during the year ended December 31, 2019, which resulted in an overall gain. In connection with the Amended AstraZeneca Agreement, certain of our previously written-down linaclotide excess purchase commitments were assumed by AstraZeneca and resulted in a settlement of approximately $2.5 million. Additionally, certain

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previously written-down linaclotide purchase commitments were satisfied through API purchases at pricing terms favorable to the pricing estimates at the time of the write-down, resulting in a gain of approximately $0.7 million upon purchase.

Research and development. The decrease in research and development expense of approximately $27.0 million for the year ended December 31, 2020 compared to the year ended December 31, 2019 was primarily related to a decrease of approximately $14.4 million in external development costs related to IW-3718; a decrease of approximately $6.1 million in operating expenses primarily related to facilities and other operating costs; a decrease of approximately $3.4 million in compensation, benefits, and other employee-related expenses; and a decrease of approximately $2.7 million related to linaclotide development.

Selling, general and administrative. Selling, general and administrative expenses decreased approximately $32.4 million for the year ended December 31, 2020 compared to the year ended December 31, 2019. The decrease in selling, general and administrative expense included an approximately $20.5 million decrease in costs associated with the Separation, which was completed on April 1, 2019, and an approximately $12.1 million decrease in non-Separation costs. The approximately $20.5 million decrease in Separation costs includes an approximately $9.7 million decrease in facilities costs primarily due to our change in headquarters location; an approximately $7.8 million decrease in compensation, benefits, and other employee-related expenses; an approximately $2.0 million decrease in consulting and investment banking costs; and an approximately $1.0 million decrease in legal costs. The approximately $12.1 million decrease in non-Separation costs includes an approximately $4.0 million decrease in legal costs; an approximately $3.3 million decrease in facilities costs primarily due to our change in headquarters location; an approximately $2.6 million decrease in travel costs as a result of the COVID-19 pandemic; an approximately $1.4 million decrease in post-marketing requirements for lesinurad as a result of our termination of the license agreement with AstraZeneca for the development, manufacture, and commercialization of products in the U.S. containing lesinurad as an active ingredient; an approximately $1.0 million decrease in collaboration costs pursuant to the Amended AstraZeneca Agreement; and an approximately $0.7 million decrease in compensation, benefits, and other employee-related expenses. These decreases in non-Separation costs were partially offset by an approximately $1.7 million increase in consulting costs.

Gain on lease modification. The gain on lease modification of approximately $3.2 million for the year ended December 31, 2019 was due to the modification of our prior headquarters lease in connection with the Separation.

Restructuring expenses. The increase in restructuring expenses of approximately $11.8 million for the year ended December 31, 2020 compared to the year ended December 31, 2019 related to the workforce reduction substantially completed during the fourth quarter of 2020 in connection with our decision to discontinue IW-3718 development. The Company recorded restructuring expenses of approximately $15.4 during the year ended December 31, 2020 in connection with this workforce reduction. During the year ended December 31, 2019, the Company recorded approximately $3.6 million in connection with a workforce reduction that was substantially completed during the first quarter of 2019.

Other (Expense) Income, Net

	Year Ended
	December 31,				Change
	2020		2019		$		%
	(dollars in thousands)
Other (expense) income:
Interest expense	$	(29,478)	$	(36,602)	$	7,124	(19)	%
Interest and investment income		1,504		2,862		(1,358)	(47)	%
Gain (loss) on derivatives		(6,129)		3,023		(9,152)	(303)	%
Loss on extinguishment of debt		—		(30,977)		30,977	(100)	%
Other income		24		514		(490)	(95)	%
Total other expense, net	$	(34,079)	$	(61,180)	$	27,101	(44)	%

Interest expense. Interest expense decreased by approximately $7.1 million during the year ended December 31, 2020 compared to the year ended December 31, 2019, primarily due to a decrease of approximately $10.4 million in interest expense related to the 2022 Convertible Notes that were partially repurchased in August 2019 and a decrease of approximately $9.0 million in interest expense associated with the 2026 Notes that were fully redeemed in September

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2019, partially offset by an increase of approximately $6.2 million and $6.1 million in interest expense associated with the 2024 Convertible Notes and the 2026 Convertible Notes, respectively.

Interest and investment income. Interest and investment income decreased by approximately $1.4 million in the year ended December 31, 2020 compared to the year ended December 31, 2019, resulting primarily from a decrease in investment income of approximately $2.1 million due to lower investment interest rates, partially offset by an increase in interest income of approximately $0.8 million related to the significant financing component of long-term receivables.

Gain (loss) on derivatives. For the year ended December 31, 2020, we recorded a loss on derivatives of approximately $6.1 million resulting from an approximately $18.3 million decrease in the fair value of the Convertible Note Hedges and an approximately $12.2 million decrease in the fair value of the Note Hedge Warrants. For the year ended December 31, 2019, we recorded a gain on derivatives of approximately $3.0 million resulting from an approximately $29.2 million increase in the fair value of the Convertible Note Hedges and an approximately $22.6 million increase in the fair value of the Note Hedge Warrants, partially offset by an approximately $3.6 million loss recognized upon the partial termination of the Convertible Note Hedges and the Note Hedge Warrants associated with the partial repurchase of the 2022 Convertible Notes. 

Loss on extinguishment of debt. The loss on extinguishment of debt was approximately $31.0 million during the year ended December 31, 2019 and pertained to the write-off of unamortized debt issuance costs and debt discount related to the partial repurchase of the 2022 Convertible Notes and the prepayment premium and write-off of the remaining unamortized debt issuance costs and debt discount on the 2026 Notes as part of the redemption of all of the outstanding principal amount of the 2026 Notes.

Other income. For the year ended December 31, 2020 compared to the year ended December 31, 2019, other income decreased by approximately $0.5 million, primarily related to a transition service agreement with Cyclerion that terminated during the first quarter of 2020.

Income taxes. During the year ended December 31, 2020, we recorded income tax expense of approximately $2.7 million, which was primarily payable to California resulting from a change in California tax that temporarily disallows the use of net operating losses. We did not record any income tax expense for the year ended December 31, 2019.

Net loss from discontinued operations. There was approximately $37.4 million of net loss from discontinued operations for the year ended December 31, 2019. For additional information on discontinued operations, see Note 3, Cyclerion Separation, to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K.

Liquidity and Capital Resources

Until the year ended December 31, 2019, we had incurred losses since our inception in 1998 and we had an accumulated deficit of approximately $1.5 billion as of December 31, 2020. We have financed our operations to date primarily through both the private sale of our preferred stock and the public sale of our common stock, debt financings, and cash generated from our operations. As of December 31, 2020, our debt is comprised of approximately $520.7 million aggregate principal amount of convertible notes, due at various dates between 2022 and 2026. Refer to Note 11, Notes Payable, to our consolidated financial statements included elsewhere in this Annual Report on Form 10-K, for information related to our debt obligations.

At December 31, 2020, we had approximately $362.6 million of unrestricted cash and cash equivalents. Our cash equivalents include amounts held in money market funds and repurchase agreements. We invest cash in excess of immediate requirements in accordance with our investment policy, which limits the amounts we may invest in certain types of investments and requires all investments held by us to be at least AA- rated, with a remaining maturity when purchased of less than twenty-four months, so as to primarily achieve liquidity and capital preservation.

During the year ended December 31, 2020, our balances of cash and cash equivalents increased by approximately $185.5 million. Net cash provided by operating activities totaled approximately $168.8 million as a result of profitable operations driven primarily by the sales of LINZESS in the U.S. Additionally, cash provided by financing activities totaled approximately $18.5 million as a result of proceeds from the exercise of stock options and purchases pursuant to our ESPP. These cash inflows were partially offset by approximately $1.8 million in capital expenditures.

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We may from time to time seek to retire, redeem or repurchase all or part of our outstanding debt through cash purchases and/or exchanges, in open market purchases, privately negotiated transactions, by tender offer or otherwise. Such repurchases, redemptions or exchanges, if any, will depend on prevailing market conditions, liquidity requirements, contractual restrictions and other factors, and the amounts involved may be material.

The COVID-19 pandemic is disrupting the U.S. healthcare system, as well as global capital markets. There continues to be significant uncertainty surrounding the extent and duration of the impact of the COVID-19 pandemic on our business and operations. The COVID-19 pandemic could have a material adverse impact on our financial condition and results of operations in the future, including by impacting our ability to obtain financing. The impact of COVID-19 on our business and financial condition is more fully described below in Trends and Uncertainties.

Cash Flows From Operating Activities

Net cash provided by operating activities totaled approximately $168.8 million for the year ended December 31, 2020. The cash provided by operations primarily related to cash flows from our net income of approximately $106.2 million, net of non-cash items of approximately $63.6 million. The non-cash items are primarily comprised of approximately $31.2 million of share-based compensation expense, approximately $22.3 million of non-cash interest expense, approximately $6.1 million loss on derivatives, and approximately $3.6 million of depreciation and amortization of property and equipment.

Net cash provided by operating activities totaled approximately $10.7 million for the year ended December 31, 2019, of which approximately $0.6 million related to cash used in continuing operations and approximately $11.3 million related to cash provided by discontinued operations. The use of approximately $0.6 million in cash for continuing operations primarily related to cash flows from our net income of approximately $21.5 million, net of non-cash items of approximately $77.8 million, partially offset by changes in assets and liabilities of approximately $100.0 million, primarily resulting from an increase in accounts receivable and related party accounts receivable of approximately $68.9 million and a decrease in accounts payable and related party accounts payable and accrued expenses of approximately $32.7 million. Non-cash items included approximately $31.3 million in share-based compensation expense, approximately $31.0 million of loss on extinguishment of debt, approximately $19.6 million in non-cash interest expense, approximately $5.6 million in depreciation and amortization expense of property and equipment, partially offset by approximately $3.5 million related to the settlement on non-cancellable purchase commitments, approximately $3.2 million gain on lease modification, and an approximate $3.0 million net increase due to the change in fair value of the Convertible Note Hedges and Note Hedge Warrants.

Cash Flows From Investing Activities

Cash used in investing activities for the year ended December 31, 2020 totaled approximately $1.8 million and pertained to the purchase of property and equipment.

Cash used in investing activities for the year ended December 31, 2019 totaled approximately $11.1 million, of which approximately $6.9 million related to cash used in continuing operations and approximately $4.2 million related to cash used in discontinued operations. Cash used in investing activities pertained primarily to the purchase of approximately $7.2 million of property and equipment, primarily laboratory space and leasehold improvements on the second floor of our prior headquarters purchased prior to the Separation and transferred to Cyclerion, and leasehold improvements, equipment, and furniture at our current headquarters.

Cash Flows From Financing Activities

Cash provided by financing activities for the year ended December 31, 2020 totaled approximately $18.5 million and resulted from proceeds from the exercise of stock options and the issuance of shares under our ESPP.

Cash used in financing activities for the year ended December 31, 2019 totaled approximately $1.2 million and resulted from approximately $227.3 million in payments to repurchase $215.0 million aggregate principal amount of the 2022 Convertible Notes. Financing activities also included principal and prepayment premium payments totaling $156.4 million to fully redeem the outstanding principal balance of the 2026 Notes. We also entered into capped call transactions for approximately $25.2 million in connection with the 2024 Convertible Notes and 2026 Convertible Notes, or the Capped Calls. These cash outflows were partially offset by approximately $391.0 million in net proceeds

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from the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, after deducting fees and expenses of approximately $9.0 million, approximately $13.6 million in proceeds from the exercise of stock options and the issuance of shares under our ESPP, and approximately $3.2 million in proceeds from the partial termination of the Convertible Notes Hedges and Note Hedge Warrants.

Funding Requirements

We began commercializing LINZESS in the U.S. with our collaboration partner, AbbVie, in the fourth quarter of 2012, and we currently derive a significant portion of our revenue from this collaboration. In addition, we are deploying significant resources to fulfill U.S. FDA requirements for linaclotide. Our goal is to generate and maintain positive cash flows, driven by increased revenue generated through sales of LINZESS and other commercial activities and financial discipline.

Under our collaboration with AbbVie for North America, total net sales of LINZESS in the U.S., as recorded by AbbVie, are reduced by commercial costs incurred by each party, and the resulting amount is shared equally between us and AbbVie. Additionally, we receive royalties from AbbVie based on sales of linaclotide in its licensed territories outside of the U.S. We believe revenues from our LINZESS partnership for the U.S. with AbbVie will continue to constitute a significant portion of our total revenue for the foreseeable future and we cannot be certain that such revenues, as well as the revenues from our other commercial activities, will continue to enable us to generate positive cash flows, or to do so in the timeframes we expect. We also anticipate that we will continue to incur substantial expenses for the next several years as we further develop and commercialize linaclotide in the U.S., develop and commercialize other products, and invest in building our pipeline through internal or external opportunities. We believe that our cash on hand as of December 31, 2020 will be sufficient to meet our projected operating needs at least through the next twelve months from the issuance of these financial statements.

Our forecast of the period of time through which our financial resources will be adequate to support our operations, including the underlying estimates regarding the costs to develop, obtain regulatory approval for, and commercialize linaclotide in the U.S., as well as our expectations regarding revenue from Astellas for Japan and AstraZeneca for China (including Hong Kong and Macau), and our goal to generate and maintain positive cash flows, are forward-looking statements that involve risks and uncertainties. Our actual results could vary materially and negatively from these and other forward-looking statements as a result of a number of factors, including the factors discussed in the “Risk Factors” section of this Annual Report on Form 10-K. We have based our estimates on assumptions that may prove to be wrong, and we could utilize our available capital resources sooner than we currently expect.

Due to the numerous risks and uncertainties associated with the development and commercialization of our product candidates, we are unable to estimate precisely the amounts of capital outlays and operating expenditures necessary to develop, obtain regulatory approval for, and commercialize linaclotide and our other product candidates, in each case, for all of the markets, indications, populations and formulations for which we believe each is suited. Our funding requirements will depend on many factors, including, but not limited to, the following:

● the revenue generated by sales of LINZESS and CONSTELLA and from any other sources;

● the rate of progress and cost of our commercialization activities, including the expense we incur in marketing and selling LINZESS in the U.S. and from any other sources;

● the success of our third-party manufacturing activities;

● the time and costs involved in developing, and obtaining regulatory approvals for, our product candidates, as well as the timing and cost of any post-approval development and regulatory requirements;

● the success of our research and development efforts;

● the emergence of competing or complementary products;

● the costs of filing, prosecuting, defending and enforcing any patent claims and other intellectual property rights;

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● the terms and timing of any additional collaborative, licensing or other arrangements that we may establish, including royalties or other payments due or payable under such agreements; and

● the acquisition of businesses, products and technologies and the impact of other strategic transactions, as well as the cost and timing of evaluating, acquiring, and, if completed, integrating into our business operations any such assets.

Financing Strategy

We may, from time to time, consider additional funding through a combination of new collaborative arrangements, strategic alliances, and additional equity and debt financings or from other sources. We will continue to manage our capital structure and to consider all financing opportunities, whenever they may occur, that could strengthen our long-term liquidity profile. Any such capital transactions may or may not be similar to transactions in which we have engaged in the past. There can be no assurance that any such financing opportunities will also be available on acceptable terms, if at all.

Contractual Commitments and Obligations

Lease Obligations

The following table summarizes our lease obligations at December 31, 2020 (in thousands):

	Payments Due by Period
			Less Than						More Than
	Total		1 Year		1 ‑ 3 Years		3 ‑ 5 Years		5 Years
Operating lease obligations	$	30,493	$	3,128	$	6,194	$	6,315	$	14,856

Our commitments for operating leases relate to our office space in Boston, Massachusetts and our data storage space in Boston, Massachusetts.

Notes Payable

In June 2015, we issued approximately $335.7 million in aggregate principal amount of the 2022 Convertible Notes. The 2022 Convertible Notes are governed by an indenture between us and U.S. Bank National Association, as trustee. The 2022 Convertible Notes are senior unsecured obligations and bear cash interest at a rate of 2.25% per year, payable on June 15 and December 15 of each year, which began on December 15, 2015. The 2022 Convertible Notes will mature on June 15, 2022, unless earlier converted or repurchased. To minimize the impact of potential dilution to our Class A common stockholders upon conversion of the 2022 Convertible Notes, we entered into the Convertible Note Hedges and Note Hedge Warrants. In August 2019, we repurchased $215.0 million aggregate principal amount of the 2022 Convertible Notes, and we partially terminated the proportionate portion of the Convertible Note Hedges and Note Hedge Warrants we entered into in connection with the issuance of the 2022 Convertible Notes.

In August 2019, we issued $200.0 million in aggregate principal amount of the 2024 Convertible Notes and $200.0 million in aggregate principal amount of the 2026 Convertible Notes. The 2024 Convertible Notes and 2026 Convertible Notes are governed by separate indentures between us and U.S. Bank National Association, as trustee. The 2024 Convertible Notes and the 2026 Convertible Notes are senior unsecured obligations. The 2024 Convertible Notes bear cash interest at the annual rate of 0.75% and the 2026 Convertible Notes bear cash interest at the annual rate of 1.50%, each payable on June 15 and December 15 of each year, which began on December 15, 2019. The 2024 Convertible Notes will mature on June 15, 2024 and the 2026 Convertible Notes will mature on June 15, 2026, unless earlier converted or repurchased. To minimize the impact of potential dilution to our Class A common stockholders upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes, we entered into separate Capped Calls in connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes. We paid the counterparties approximately $25.2 million to enter into the Capped Calls.

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The following table summarizes our obligations under our convertible senior notes at December 31, 2020 (in thousands):

	Payments Due by Period
			Less Than						More Than
	Total		1 Year		1 - 3 Years		3 - 5 Years		5 Years
2022 Convertible Notes (including interest)		124,773		2,716		122,057		—		—
2024 Convertible Notes (including interest)		205,250		1,500		3,000		200,750		—
2026 Convertible Notes (including interest)		216,500		3,000		6,000		6,000		201,500
Total payments on convertible senior notes	$	546,523	$	7,216	$	131,057	$	206,750	$	201,500

Our obligations under our convertible senior notes, as well as potential financial effects from the Convertible Note Hedges, Note Hedge Warrants and Capped Calls are more fully described in Note 11, Notes Payable, in the accompanying notes to our financial statements appearing elsewhere in this Annual Report on Form 10-K.

Tax-related Obligations

We exclude liabilities or obligations pertaining to uncertain tax positions from our summary of contractual commitments and obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2020, we have approximately $68.1 million of uncertain tax positions, and we cannot reasonably estimate the potential adjustment to our net operating loss and credit carryforwards. These uncertain tax positions are more fully described in Note 15, Income Taxes, in the accompanying notes to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Off-Balance Sheet Arrangements

We do not have any relationships with unconsolidated entities or financial partnerships, such as entities often referred to as structured finance or special purpose entities, that would have been established for the purpose of facilitating off-balance sheet arrangements or other contractually narrow or limited purposes. As such, we are not exposed to any financing, liquidity, market or credit risk that could arise if we had engaged in those types of relationships. We enter into guarantees in the ordinary course of business related to the guarantee of our own performance and the performance of our subsidiaries.

New Accounting Pronouncements

For a discussion of recent accounting pronouncements, refer to Note 2, Summary of Significant Accounting Policies, to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K. We did not otherwise adopt any new accounting pronouncements during the fiscal year ended December 31, 2020 that had a material effect on our consolidated financial statements included in this report.

Trends and Uncertainties

Impact of the COVID-19 Pandemic

In December 2019, COVID-19 emerged in Wuhan, Hubei Province, China. On March 11, 2020, the World Health Organization declared a global pandemic and recommended containment and mitigation measures worldwide. On March 13, 2020, former U.S. President Donald Trump announced a national emergency relating to the pandemic. Government authorities in the U.S. have recommended or imposed various containment and mitigation measures on large portions of the population, and similar measures have also been taken in many other countries around the world. Both the outbreak of COVID-19 and the containment and mitigation efforts have had a serious adverse impact on the U.S. economy and the economies of other countries around the world, the severity and duration of which remain uncertain.

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The COVID-19 pandemic, including containment and mitigation measures has impacted, and is expected to continue to impact, our business and operations in a number of ways, including:

● Day to Day Operations

Most of our customer-facing employees have resumed in-person work practices; however, they are limited in the number of in-person details they are able to conduct due to containment and mitigation measures related to the COVID-19 pandemic. We monitor the impact of the COVID-19 pandemic in the territories where our customer-facing employees have resumed in-person work practices, and in some cases, we have paused the in-person work practices as a result of the impact of the COVID-19 pandemic in those territories. Customer-facing employees who are not providing in-person services continue to support their customers virtually through telephone and web-based technologies. Headquarters employees have the option to work remotely through mid-2021.

● Collaboration Agreement for North America with AbbVie

We and our partner, AbbVie, are focused on maintaining the availability of LINZESS for adult men and women suffering from IBS-C or CIC. We include our and AbbVie’s collaboration-related selling, general, and administrative expenses, including expenses from in-person and remote selling activities, in the calculation of net profits from the sale of LINZESS in the U.S. and present net payments to us as collaborative arrangements revenue. In the fourth quarter of 2020, we and AbbVie agreed to include costs incurred throughout 2020 associated with remote selling activities performed by our and AbbVie’s customer-facing employees in collaboration-related selling, general and administrative expenses in our calculation of net profits from the sale of LINZESS in the U.S. As such, we have experienced fluctuations in our settlement payments based on the ratio of selling, general and administrative expenses incurred by each party during the year ended December 31, 2020, and may continue to experience such fluctuations in the future. The COVID-19 pandemic may negatively impact future net sales of LINZESS in the U.S., including as a result of reduced and/or restricted in-person promotion or potential changes in patient access to healthcare (including due to unemployment or modifications in insurance coverage) and payor reimbursement levels.
​

● Manufacturing and Supply Chain

We and AbbVie continue to monitor the supply and availability of LINZESS for adult men and women suffering from IBS-C or CIC in the U.S. As of the date of this Annual Report on Form 10-K, the COVID-19 pandemic has not caused significant disruptions to manufacturing operations or supply of LINZESS in the U.S. or of clinical trial material for our ongoing trials.
​

● Clinical Development of GI Pipeline

The COVID-19 pandemic impacted the development of our pipeline during the year ended December 31, 2020. For example, prior to our decision to discontinue the development of IW-3718, the COVID-19 pandemic impacted enrollment in our Phase III clinical trials of IW-3718 for the treatment of refractory GERD, resulting in lower than expected research and development expenses relating to IW-3718 clinical trials during the year ended December 31, 2020.

The COVID-19 pandemic resulted in changes to our business and operations which impacted our financial condition and results of operations for the year ended December 31, 2020, including as described above. During the year ended December 31, 2020, we incurred a total of approximately $2.4 million of incremental expenses, primarily related to personal protective equipment for our field-based employees and external costs of strategy and operations analysis related to the impacts of the COVID-19 pandemic.

There continue to be significant uncertainties surrounding the extent and duration of the impact of the COVID-19 pandemic on our business and operations and we expect to incur additional expenses in future periods related to the impact of the COVID-19 pandemic on our business and operations. We continue to evaluate the impact of the COVID-19 pandemic on our operating results and financial condition. The COVID-19 pandemic may have a material adverse impact on our business and financial condition in the future.

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Item 7A.    Quantitative and Qualitative Disclosures about Market Risk

Interest Rate Risk

We are exposed to market risk related to changes in interest rates. We invest our cash in a variety of financial instruments, principally securities issued by the U.S. government and its agencies, collateralized reverse repurchase agreements, and money market instruments. The goals of our investment policy are preservation of capital, fulfillment of liquidity needs and fiduciary control of cash and investments. We also seek to maximize income from our investments without assuming significant risk.

Our primary exposure to market risk is interest income sensitivity, which is affected by changes in the general level of interest rates, particularly because our investments are in short-term marketable securities. Due to the primarily short-term duration of our investment portfolio and the low risk profile of our investments, an immediate 1% change in interest rates would not have a material effect on the fair market value of our portfolio. Accordingly, we would not expect our operating results or cash flows to be affected to any significant degree by the effect of a sudden change in market interest rates on our investment portfolio.

We do not believe our cash and cash equivalents have significant risk of default or illiquidity. While we believe our cash and cash equivalents do not contain excessive risk, we cannot provide absolute assurance that in the future our investments will not be subject to adverse changes in market value. In addition, we maintain significant amounts of cash and cash equivalents at one or more financial institutions that are in excess of federally insured limits. Given the potential instability of financial institutions, we cannot provide assurance that we will not experience losses on these deposits.

Our convertible senior notes bear interest at a fixed rate and therefore have minimal exposure to changes in interest rates; however, because these interest rates are fixed, we may be paying a higher interest rate, relative to market, in the future if our credit rating improves or other circumstances change.

Equity Price Risk

Our convertible notes include conversion and settlement provisions that are based on the price of our Class A Common Stock at conversion or maturity of the notes. The amount of cash we may be required to pay is determined by the price of our Class A Common Stock. The fair values of our convertible notes are dependent on the price and volatility of our Class A Common Stock and will generally increase or decrease as the market price of our common stock changes.

To minimize the impact of potential dilution to our common stock upon conversion of the notes, we entered into the Convertible Note Hedges and Note Hedge Warrants, with respect to the 2022 Convertible Notes, and the Capped Calls, with respect to the 2024 Convertible Notes and 2026 Convertible Notes.

The convertible notes and derivatives are more fully described in Note 11, Notes Payable, in the accompanying notes to our consolidated financial statements appearing elsewhere in this Annual Report on Form 10-K.

Foreign Currency Risk

We have no significant monetary assets or liabilities expected to be settled in foreign currencies and we do not expect to be impacted significantly by foreign currency fluctuations.

Effects of Inflation

We do not believe that inflation and changing prices over the years ended December 31, 2020, 2019, and 2018 had a significant impact on our results of operations.

Item 8.     Financial Statements and Supplementary Data

Our consolidated financial statements, together with the independent registered public accounting firm report thereon, appear at pages F-1 through F-57, of this Annual Report on Form 10-K.

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Item 9.    Changes in and Disagreements with Accountants on Accounting and Financial Disclosure

None.

Item 9A.    Controls and Procedures

Evaluation of Disclosure Controls and Procedures

As required by Rule 13a-15(b) of the Securities Exchange Act of 1934, or Exchange Act, our management, including our principal executive officer and our principal financial officer, conducted an evaluation as of the end of the period covered by this Annual Report on Form 10-K of the effectiveness of the design and operation of our disclosure controls and procedures. Based on that evaluation, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures are effective at the reasonable assurance level in ensuring that information required to be disclosed by us in the reports that we file or submit under the Exchange Act is recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports we file under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial officer, as appropriate to allow timely decisions regarding required disclosure.

Management’s Report on Internal Control Over Financial Reporting

Our management is responsible for establishing and maintaining adequate internal control over our financial reporting. Internal control over financial reporting is defined in Rules 13a-15(f) and 15d-15(f) under the Exchange Act as the process designed by, or under the supervision of, our Chief Executive Officer and Chief Financial Officer, and effected by our board of directors, management and other personnel, to provide reasonable assurance regarding the reliability of our financial reporting and the preparation of our financial statements for external purposes in accordance with generally accepted accounting principles, and includes those policies and procedures that:

(1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of assets;

(2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures are being made only in accordance with the authorizations of management and directors; and

(3) provide reasonable assurance regarding the prevention or timely detection of unauthorized acquisition, use or disposition of assets that could have a material effect on our financial statements.

Under the supervision and with the participation of our management, including our Chief Executive Officer and Chief Financial Officer, we conducted an evaluation of the effectiveness of our internal control over financial reporting based on the framework provided in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework). Based on this evaluation, our management concluded that our internal control over financial reporting was effective as of December 31, 2020.

The effectiveness of our internal control over financial reporting as of December 31, 2020 has been audited by Ernst and Young LLP, an independent registered public accounting firm, as stated in their report, which is included herein.

Changes in Internal Control

As required by Rule 13a-15(d) of the Exchange Act, our management, including our principal executive officer and our principal financial officer, conducted an evaluation of the internal control over financial reporting to determine whether any changes occurred during the quarter ended December 31, 2020 that have materially affected, or are reasonably likely to materially affect, our internal controls over financial reporting.

Based on that evaluation, our principal executive officer and principal financial officer concluded no changes during the quarter ended December 31, 2020 materially affected, or were reasonably likely to materially affect, our internal controls over financial reporting.

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Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of Ironwood Pharmaceuticals, Inc.

Opinion on Internal Control over Financial Reporting

We have audited Ironwood Pharmaceuticals, Inc.’s internal control over financial reporting as of December 31, 2020, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) (the COSO criteria). In our opinion, Ironwood Pharmaceuticals, Inc. (the Company) maintained, in all material respects, effective internal control over financial reporting as of December 31, 2020, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the consolidated balance sheets of the Company as of December 31, 2020 and 2019, the related consolidated statements of comprehensive income (loss), shareholders’ equity (deficit) and cash flows for each of the three years in the period ended December 31, 2020, and the related notes and our report dated February 17, 2021 expressed an unqualified opinion thereon.

Basis for Opinion

The Company’s management is responsible for maintaining effective internal control over financial reporting and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control over Financial Reporting. Our responsibility is to express an opinion on the Company’s internal control over financial reporting based on our audit. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audit in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects.

Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

Definition and Limitations of Internal Control Over Financial Reporting

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

/s/ Ernst & Young LLP

Boston, Massachusetts

February 17, 2021

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Item 9B.    Other Information

None.

PART III

Item 10.    Directors, Executive Officers and Corporate Governance

We have adopted a code of business conduct and ethics applicable to our directors, executive officers and all other employees. A copy of that code is available on our corporate website at http://www.ironwoodpharma.com. Any amendments to the code of business conduct and ethics, and any waivers thereto involving our executive officers, also will be available on our corporate website. A printed copy of these documents will be made available upon request. The content on our website is not incorporated by reference into this Annual Report on Form 10-K.

The other information required by this item is incorporated by reference from our proxy statement for our 2021 Annual Meeting of Stockholders.

Item 11.    Executive Compensation

The information required by this item is incorporated by reference from our proxy statement for our 2021 Annual Meeting of Stockholders.

Item 12.    Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters

The information relating to security ownership of certain beneficial owners of our common stock and information relating to the security ownership of our management required by this item is incorporated by reference from our proxy statement for our 2021 Annual Meeting of Stockholders.

The table below sets forth information with regard to securities authorized for issuance under our equity compensation plans as of December 31, 2020. As of December 31, 2020, we had three active equity compensation plans, each of which was approved by our stockholders:

● Amended and Restated 2010 Employee, Director and Consultant Equity Incentive Plan;

● 2019 Equity Incentive Plan; and

● Amended and Restated 2010 Employee Stock Purchase Plan.

Plan Category	Number of securities to be issued upon exercise of outstanding options, warrants and rights (1)	Weighted-average exercise price of outstanding options, warrants, and rights (2)	Number of securities remaining available for future issuance under equity compensation plans (excluding securities reflected in column (a))
	(a)	(b)	(c)
Equity compensation plans approved by security holders	18,216,454	$ 12.25	9,651,783
Equity compensation plans not approved by security holders	—	—	—
Total	18,216,454	$ 12.25	9,651,783

(1)	Amount includes the number of shares subject to issuance upon exercise of 13,459,671 outstanding stock options and vesting of 4,756,783 restricted stock units.
(2)	Amount includes all outstanding stock options but does not include restricted stock units, which do not have an exercise price.

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Item 13.    Certain Relationships and Related Transactions, and Director Independence

The information required by this item is incorporated by reference from our proxy statement for our 2021 Annual Meeting of Stockholders.

Item 14.    Principal Accountant Fees and Services

The information required by this item is incorporated by reference from our proxy statement for our 2021 Annual Meeting of Stockholders.

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PART IV

Item 15.    Exhibits and Financial Statement Schedules

1. List of documents filed as part of this report

1. Consolidated Financial Statements listed under Part II, Item 8 and included herein by reference.

2. Consolidated Financial Statement Schedules

No schedules are submitted because they are not applicable, not required or because the information is included in the Consolidated Financial Statements or Notes to Consolidated Financial Statements.

3. Exhibits

		Incorporated by reference herein
Number	Description	Form	Date
2.1	Separation Agreement, dated as of March 30, 2019, by and between Ironwood Pharmaceuticals, Inc. and Cyclerion Therapeutics, Inc.	Current Report on Form 8-K (File No. 001-34620)	April 4, 2019
3.1	Eleventh Amended and Restated Certificate of Incorporation	Annual Report on Form 10-K (File No. 001-34620)	March 30, 2010
3.2	Certificate of Retirement	Registration Statement on Form 8-A/A (File No. 001-34620)	January 3, 2019
3.3	Certificate of Amendment	Current Report on Form 8-K (File No. 001-34620)	May 31, 2019
3.4	Fifth Amended and Restated Bylaws	Annual Report on Form 10-K (File No. 001-34620)	March 30, 2010
4.1	Specimen Class A Common Stock certificate	Registration Statement on Form S-1, as amended (File No. 333-163275)	January 20, 2010
4.2	Indenture, dated as of June 15, 2015, by and between Ironwood Pharmaceuticals, Inc. and U. S. Bank National Association (including the form of the 2.25% Convertible Senior Note due 2022)	Current Report on Form 8-K (File No. 001-34620)	June 15, 2015
4.2.1	Supplemental Indenture dated as of April 5, 2019 by and between Ironwood Pharmaceuticals, Inc. and U.S. Bank National Association	Current Report on Form 8-K (File No. 001-34620)	April 8, 2019
4.2.2	Form of 2.25% Convertible Senior Note due 2022	Current Report on Form 8 K (File No. 001 34620)	June 15, 2015
4.3	Indenture, dated as of August 12, 2019, by and between Ironwood Pharmaceuticals, Inc. and U.S. Bank National Association (including the form of the 0.75% Convertible Senior Note due 2024)	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019

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4.3.1	Form of 0.75% Convertible Senior Note due 2024	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
4.4	Indenture, dated as of August 12, 2019, by and between Ironwood Pharmaceuticals, Inc. and U.S. Bank National Association (including the form of the 1.50% Convertible Senior Note due 2026)	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
4.4.1	Form of 1.50% Convertible Senior Note due 2026	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
4.5*	Description of Securities of Ironwood Pharmaceuticals, Inc.
10.1#	Amended and Restated 2010 Employee, Director and Consultant Equity Incentive Plan	Registration Statement on Form S-8, as amended (File No. 333-184396)	October 12, 2012
10.1.1#	Form of Stock Option Agreement under the Amended and Restated 2010 Employee, Director and Consultant Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	November 6, 2018
10.1.2#	Form of Restricted Stock Unit Agreement under the Amended and Restated 2010 Employee, Director and Consultant Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	November 6, 2018
10.2#	2019 Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	July 30, 2019
10.2.1#	Form of Non-statutory Stock Option Agreement under the 2019 Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	July 30, 2019
10.2.2#	Form of Restricted Stock Unit Agreement under the 2019 Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	July 30, 2019
10.2.3#	Form of Restricted Stock Agreement under the 2019 Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	July 30, 2019
10.2.4#	Form of Performance-Based Restricted Stock Unit Award Agreement under the 2019 Equity Incentive Plan	Quarterly Report on Form 10-Q (File No. 001-34620)	May 6, 2020
10.3#	Amended and Restated 2010 Employee Stock Purchase Plan	Annual Report on Form 10-K (File No. 001-34620)	February 13, 2020
10.4#	Change of Control Severance Benefit Plan, as amended and restated	Quarterly Report on Form 10-Q (File No. 001-34620)	April 29, 2014
10.5#	Form of Executive Severance Agreement	Annual Report on Form 10-K (File No. 001-34620)	February 25, 2019

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10.6#	Non-employee Director Compensation Policy, effective May 20, 2019	Quarterly Report on Form 10-Q (File No. 001-34620)	July 30, 2019
10.7#	Form of Indemnification Agreement with Directors and Officers	Registration Statement on Form S-1, as amended (File No. 333-163275)	December 23, 2009
10.8#	Offer Letter, dated January 3, 2019, between Ironwood Pharmaceuticals, Inc. and Mark Mallon	Current Report on Form 8-K (File No. 001-34620)	January 4, 2019
10.9+	Collaboration Agreement, dated as of September 12, 2007, as amended on November 3, 2009, by and between Forest Laboratories, Inc. and Ironwood Pharmaceuticals, Inc.	Registration Statement on Form S-1, as amended (File No. 333-163275)	February 2, 2010
10.9.1	Amendment No. 2 to the Collaboration Agreement, dated as of January 8, 2013, by and between Forest Laboratories, Inc. and Ironwood Pharmaceuticals, Inc.	Annual Report on Form 10-K (File No. 001-34620)	February 21, 2013
10.10+	Commercial Agreement, dated as of January 31, 2017, by and among Allergan USA, Inc., Forest Laboratories, LLC and Ironwood Pharmaceuticals, Inc.	Quarterly Report on Form 10-Q (File No. 001-34620)	May 8, 2017
10.11+	License Agreement, dated as of April 30, 2009, by and between Allergan Pharmaceuticals International Ltd. (formerly with Almirall, S.A.) and Ironwood Pharmaceuticals, Inc.	Registration Statement on Form S-1, as amended (File No. 333-163275)	February 2, 2010
10.11.1+	Amendment No. 1 to License Agreement, dated as of June 11, 2013, by and between Allergan Pharmaceuticals International Ltd. (formerly with Almirall, S.A.) and Ironwood Pharmaceuticals, Inc.	Quarterly Report on Form 10-Q (File No. 001-34620)	August 8, 2013
10.11.2+	Amendment to the License Agreement, dated as of October 26, 2015, by and between Allergan Pharmaceuticals International Ltd. and Ironwood Pharmaceuticals, Inc.	Annual Report on Form 10-K (File No. 001-34620)	February 19, 2016
10.11.3+	Amendment to the License Agreement dated as of January 31, 2017, by and between Allergan Pharmaceuticals International Ltd., and Ironwood Pharmaceuticals, Inc.	Quarterly Report on Form 10-Q (File No. 001-34620)	May 8, 2017
10.12+	Novation Agreement, dated as of October 26, 2015, by and among Almirall, S.A., Allergan Pharmaceuticals International Ltd. and Ironwood Pharmaceuticals, Inc.	Annual Report on Form 10-K (File No. 001-34620)	February 19, 2016

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10.13+	Amended and Restated License Agreement, dated as of August 1, 2019, by and between Ironwood Pharmaceuticals, Inc. and Astellas Pharma Inc.	Current Report on Form 8-K (File No. 001-34620	August 1, 2019
10.13.1*	Amendment to the Amended and Restated License Agreement, dated as of January 8, 2021, by and between Ironwood Pharmaceuticals, Inc. and Astellas Pharma Inc.
10.14+	Amended and Restated License and Collaboration Agreement, dated as of September 16, 2019, by and between AstraZeneca AB and Ironwood Pharmaceuticals, Inc.	Current Report on Form 8-K (File No. 001-34620)	September 18, 2019
10.15+	Commercial Supply Agreement, dated as of June 23, 2010, by and among PolyPeptide Laboratories, Inc. and Polypeptide Laboratories (SWEDEN) AB, Forest Laboratories, Inc. and Ironwood Pharmaceuticals, Inc.	Quarterly Report on Form 10-Q (File No. 001-34620)	August 10, 2010
10.16+	Commercial Supply Agreement, dated as of March 28, 2011, by and among Corden Pharma Colorado, Inc. (f/k/a Roche Colorado Corporation), Ironwood Pharmaceuticals, Inc. and Forest Laboratories, Inc.	Quarterly Report on Form 10-Q (File No. 001-34620)	May 13, 2011
10.16.1+	Amendment No. 3 to Commercial Supply Agreement, dated as of November 26, 2013, by and between Corden Pharma Colorado, Inc. (f/k/a Roche Colorado Corporation), Ironwood Pharmaceuticals, Inc. and Forest Laboratories, Inc.	Annual Report on Form 10-K (File No. 001-34620)	February 7, 2014
10.17	Lease Agreement for facilities at 100 Summer Street, Boston, Massachusetts, dated as of June 11, 2019, by and between Ironwood Pharmaceuticals, Inc. and MA-100 Summer Street Owner, L.L.C.	Current Report on Form 8-K (File No. 001-34620)	June 13, 2019
10.18	Tax Matters Agreement, dated as of March 30, 2019, by and between Ironwood Pharmaceuticals, Inc. and Cyclerion Therapeutics, Inc.	Current Report on Form 8-K (File No. 001-34620)	April 4, 2019
10.19	Employee Matters Agreement, dated as of March 30, 2019, by and between Ironwood Pharmaceuticals, Inc. and Cyclerion Therapeutics, Inc.	Current Report on Form 8-K (File No. 001-34620)	April 4, 2019

81

10.20	Base Call Option Transaction Confirmation, dated as of June 10, 2015, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association, London Branch	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.21	Base Call Option Transaction Confirmation, dated as of June 10, 2015, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC, through its agent Credit Suisse Securities (USA) LLC	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.22	Base Warrants Confirmation, dated as of June 10, 2015, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association, London Branch	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.23	Base Warrants Confirmation, dated as of June 10, 2015, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC, through its agent Credit Suisse Securities (USA) LLC	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.24	Additional Call Option Transaction Confirmation, dated as of June 22, 2015, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association, London Branch	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.25	Additional Call Option Transaction Confirmation, dated as of June 22, 2015, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC, through its agent Credit Suisse Securities (USA) LLC	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.26	Additional Warrants Confirmation, dated as of June 22, 2015, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association, London Branch	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.27	Additional Warrants Confirmation, dated as of June 22, 2015, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC, through its agent Credit Suisse Securities (USA) LLC	Quarterly Report on Form 10-Q (File No. 001-34620)	August 7, 2015
10.28	Base Call Option Transaction Confirmation for the 2024 Notes, dated as of August 7, 2019, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.29	Base Call Option Transaction Confirmation for the 2026 Notes, dated as of August 7, 2019, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019

82

10.30	Base Call Option Transaction Confirmation for the 2024 Notes, dated as of August 7, 2019, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.31	Base Call Option Transaction Confirmation, for the 2026 Notes, dated as of August 7, 2019, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.32	Additional Call Option Transaction Confirmation for the 2024 Notes, dated as of August 12, 2019, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.33	Additional Call Option Transaction Confirmation for the 2026 Notes, dated as of August 12, 2019, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.34	Additional Call Option Transaction Confirmation for the 2024 Notes, dated as of August 12, 2019, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.35	Additional Call Option Transaction Confirmation for the 2026 Notes, dated as of August 12, 2019, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC	Current Report on Form 8-K (File No. 001-34620)	August 13, 2019
10.36	Call Spread Unwind Agreement, dated as of August 7, 2019, between Ironwood Pharmaceuticals, Inc. and JPMorgan Chase Bank, National Association	Annual Report on Form 10-K (File No. 001-34620)	February 13, 2020
10.37	Call Spread Unwind Agreement, dated as of August 7, 2019, between Ironwood Pharmaceuticals, Inc. and Credit Suisse Capital LLC	Annual Report on Form 10-K (File No. 001-34620)	February 13, 2020
21.1	Subsidiaries of Ironwood Pharmaceuticals, Inc.	Annual Report on Form 10-K (File No. 001-34620)	February 13, 2020
23.1*	Consent of Independent Registered Public Accounting Firm
31.1*	Certification of Chief Executive Officer pursuant to Rules 13a-14 or 15d-14 of the Exchange Act

83

31.2*	Certification of Chief Financial Officer pursuant to Rules 13a-14 or 15d-14 of the Exchange Act
32.1‡	Certification of Chief Executive Officer pursuant to Rules 13a-14(b) or 15d-14(b) of the Exchange Act and 18 U.S.C. Section 1350
32.2‡	Certification of Chief Financial Officer pursuant to Rules 13a-14(b) or 15d-14(b) of the Exchange Act and 18 U.S.C. Section 1350
101.INS*	XBRL Instance Document – The Instance Document does not appear in the Interactive Data Files because its XBRL tags are embedded within the Inline XBRL document
101.SCH*	XBRL Taxonomy Extension Schema Document
101.CAL*	XBRL Taxonomy Extension Calculation Linkbase Document
101.LAB*	XBRL Taxonomy Extension Label Linkbase Database
101.PRE*	XBRL Taxonomy ExtensionPresentation Linkbase Document
101.DEF*	XBRL Taxonomy Extension Definition Linkbase Document
104*	The cover page from this Annual Report on Form 10-K, formatted in Inline XBRL

* Filed herewith.

‡ Furnished herewith.

+ Confidential treatment granted under 17 C.F.R. §§200.80(b)(4) and 230.406. The confidential portions of this exhibit have been omitted and are remeasured accordingly. The confidential portions have been provided separately to the SEC pursuant to the confidential treatment request.

# Management contract or compensatory plan, contract, or arrangement.

Item 16.    Form 10-K Summary

None.

84

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, in the City of Boston, Commonwealth of Massachusetts, on the 17^th day of February 2021.

Ironwood Pharmaceuticals, Inc.
By:	/s/ Mark Mallon
	Mark Mallon
	Chief Executive Officer

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the date indicated.

Signature	Title	Date
/s/ Mark Mallon	Chief Executive Officer and Director (Principal Executive Officer)	February 17, 2021
Mark Mallon
/s/ Gina Consylman	Senior Vice President, Chief Financial Officer (Principal Financial Officer)	February 17, 2021
Gina Consylman
/s/ Kelly MacDonald	Vice President, Finance and Chief Accounting Officer (Principal Accounting Officer)	February 17, 2021
Kelly MacDonald
/s/ Julie H. McHugh	Chair of the Board	February 17, 2021
Julie H. McHugh
/s/ Mark Currie	Director	February 17, 2021
Mark Currie
	Director
Alexander Denner
/s/ Andrew Dreyfus	Director	February 17, 2021
Andrew Dreyfus
/s/ Jon Duane	Director	February 17, 2021
Jon Duane
/s/ Marla Kessler	Director	February 17, 2021
Marla Kessler
/s/ Catherine Moukheibir	Director	February 17, 2021
Catherine Moukheibir
/s/ Lawrence S. Olanoff	Director	February 17, 2021
Lawrence S. Olanoff

85

/s/ Edward P. Owens	Director	February 17, 2021
Edward P. Owens
/s/ JAY P. SHEPARD	Director	February 17, 2021
Jay P. Shepard

86

Index to Consolidated Financial Statements of
Ironwood Pharmaceuticals, Inc.

	Page
Report of Independent Registered Public Accounting Firm	F-2
Consolidated Balance Sheets as of December 31, 2020 and 2019	F-4
Consolidated Statements of Operations for the Years Ended December 31, 2020, 2019, and 2018	F-5
Consolidated Statements of Comprehensive Income (Loss) for the Years Ended December 31, 2020, 2019, and 2018	F-6
Consolidated Statements of Stockholders’ Equity (Deficit) for the Years Ended December 31, 2020, 2019, and 2018	F-7
Consolidated Statements of Cash Flows for the Years Ended December 31, 2020, 2019, and 2018	F-9
Notes to Consolidated Financial Statements	F-11

F-1

Report of Independent Registered Public Accounting Firm

To the Shareholders and the Board of Directors of Ironwood Pharmaceuticals, Inc.

Opinion on the Financial Statements

We have audited the accompanying consolidated balance sheets of Ironwood Pharmaceuticals, Inc. (the Company) as of December 31, 2020 and 2019, the related consolidated statements of operations, comprehensive income (loss), stockholders’ equity (deficit) and cash flows for each of the three years in the period ended December 31, 2020, and the related notes (collectively referred to as the “consolidated financial statements”). In our opinion, the consolidated financial statements present fairly, in all material respects, the financial position of the Company at December 31, 2020 and 2019, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2020, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (PCAOB), the Company’s internal control over financial reporting as of December 31, 2020, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (2013 framework) and our report dated February 17, 2021 expressed an unqualified opinion thereon.

Basis for Opinion

These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on the Company’s financial statements based on our audits. We are a public accounting firm registered with the PCAOB and are required to be independent with respect to the Company in accordance with the U.S. federal securities laws and the applicable rules and regulations of the Securities and Exchange Commission and the PCAOB.

We conducted our audits in accordance with the standards of the PCAOB. Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement, whether due to error or fraud. Our audits included performing procedures to assess the risks of material misstatement of the financial statements, whether due to error or fraud, and performing procedures that respond to those risks. Such procedures included examining, on a test basis, evidence regarding the amounts and disclosures in the financial statements. Our audits also included evaluating the accounting principles used and significant estimates made by management, as well as evaluating the overall presentation of the financial statements. We believe that our audits provide a reasonable basis for our opinion.

Critical Audit Matter

The critical audit matter communicated below is a matter arising from the current period audit of the financial statements that was communicated or required to be communicated to the audit committee and that: (1) relates to accounts or disclosures that are material to the financial statements and (2) involved our especially challenging, subjective or complex judgments. The communication of the critical audit matter does not alter in any way our opinion on the consolidated financial statements, taken as a whole, and we are not, by communicating the critical audit matter below, providing a separate opinion on the critical audit matter or on the accounts or disclosure to which it relates.

Collaboration Agreement for North America with AbbVie Inc.

Description of the Matter

Revenue recognized from the Collaboration Agreement for North America with AbbVie Inc. (together with its affiliates, or “AbbVie”) was $368.6 million for the sale of LINZESS in the U.S. for the year ended December 31, 2020. As discussed in Note 6 to the consolidated financial statements, the Company generates the majority of its revenue from a collaboration arrangement with AbbVie related to linaclotide (LINZESS). The Company records its share of the net profits or net losses from the sales of LINZESS in the U.S., less commercial expenses, and presents the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable.

F-2

Auditing revenue recognition under the AbbVie collaboration is especially challenging and requires significant auditor judgment because complete and accurate information regarding net profits realized from sales of LINZESS in the U.S. and the costs incurred in selling it may not be available at the time the financial statements are prepared.

How We Addressed the Matter in Our Audit

We obtained an understanding, evaluated the design and tested the operating effectiveness of the Company’s internal controls over its collaboration revenue process. The Company maintains and operates a suite of controls over the Company’s evaluation of the completeness and accuracy of its quarterly reporting from AbbVie.   Our audit procedures included, among others, reviewing the Company’s contract with AbbVie, reviewing information provided by AbbVie, performing auditing procedures over gross sales and adjustments to arrive at net sales, cost of goods sold, and selling and marketing costs contributing to Ironwood’s share of net profits, and obtaining confirmation directly from AbbVie.

/s/ Ernst & Young LLP

We have served as the Company’s auditor since 1998.

Boston, Massachusetts

February 17, 2021

F-3

Ironwood Pharmaceuticals, Inc.

Consolidated Balance Sheets

(In thousands, except share and per share amounts)

	December 31,		December 31,
	2020		2019
ASSETS
Current assets:
Cash and cash equivalents	$	362,564	$	177,023
Accounts receivable, net		122,351		11,279
Related party accounts receivable, net		—		105,967
Inventory, net		—		648
Prepaid expenses and other current assets		9,189		10,685
Restricted cash		1,735		1,250
Total current assets		495,839		306,852
Restricted cash, net of current portion		485		971
Accounts receivable, net of current portion		23,401		32,597
Property and equipment, net		8,929		12,429
Operating lease right-of-use assets		16,576		17,743
Convertible note hedges		13,065		31,366
Other assets		943		790
Total assets	$	559,238	$	402,748
LIABILITIES AND STOCKHOLDERS' EQUITY (DEFICIT)
Current liabilities:
Accounts payable	$	661	$	3,978
Related party accounts payable, net		—		1,509
Accrued research and development costs		1,898		2,956
Accrued expenses and other current liabilities		26,486		30,465
Current portion of operating lease liabilities		3,128		1,146
Deferred revenue		—		875
Total current liabilities		32,173		40,929
Note hedge warrants		12,088		24,260
Convertible senior notes		430,256		407,994
Operating lease obligations, net of current portion		20,318		22,082
Other liabilities		1,763		734
Commitments and contingencies
Stockholders’ equity (deficit):
Preferred stock, $0.001 par value, 75,000,000 shares authorized, no shares issued and outstanding		—		—
Class A Common Stock, $0.001 par value, 500,000,000 shares authorized and 160,616,675 shares issued and outstanding at December 31, 2020 and 500,000,000 shares authorized and 157,535,962 shares issued and outstanding at December 31, 2019		161		158
Additional paid-in capital		1,528,535		1,478,823
Accumulated deficit		(1,466,056)		(1,572,232)
Total stockholders’ equity (deficit)		62,640		(93,251)
Total liabilities and stockholders’ equity (deficit)	$	559,238	$	402,748

The accompanying notes are an integral part of these consolidated financial statements.

F-4

Ironwood Pharmaceuticals, Inc.
Consolidated Statements of Operations
(In thousands, except per share amounts)

	Years Ended December 31,
	2020		2019		2018
Revenues:
Collaborative arrangements revenue	$	381,545	$	379,652		272,839
Product revenue, net		—		—		3,445
Sale of active pharmaceutical ingredient		7,978		48,761		70,355
Total revenues		389,523		428,413		346,639
Cost and expenses:
Cost of revenues, excluding amortization of acquired intangible assets		3,136		23,875		32,751
Write-down of commercial supply and inventory to net realizable value and (settlement) loss on non-cancellable purchase commitments		—		(3,530)		247
Research and development		88,062		115,044		101,060
Selling, general and administrative		140,003		172,450		219,676
Amortization of acquired intangible assets		—		—		8,111
Gain on fair value remeasurement of contingent consideration		—		—		(31,045)
Gain on lease modification		—		(3,169)		—
Restructuring expenses		15,382		3,620		14,715
Impairment of intangible assets		—		—		151,794
Total cost and expenses		246,583		308,290		497,309
Income (loss) from operations		142,940		120,123		(150,670)
Other (expense) income:
Interest expense		(29,478)		(36,602)		(37,724)
Interest and investment income		1,504		2,862		2,991
Gain (loss) on derivatives		(6,129)		3,023		(8,743)
Loss on extinguishment of debt		—		(30,977)		—
Other income		24		514		—
Other expense, net		(34,079)		(61,180)		(43,476)
Income (loss) from continuing operations, before income taxes		108,861		58,943		(194,146)
Income tax expense		2,685		—		—
Income (loss) from continuing operations		106,176		58,943		(194,146)
Loss from discontinued operations, net of income taxes		—		(37,438)		(88,222)
Net income (loss)	$	106,176	$	21,505	$	(282,368)
Income (loss) per share from continuing operations, net of income taxes—basic	$	0.67	$	0.38	$	(1.27)
Income (loss) per share from continuing operations, net of income taxes—diluted	$	0.66	$	0.38	$	(1.27)
Loss per share from discontinued operations, net of income taxes—basic and diluted	$	—	$	(0.24)	$	(0.58)
Net income (loss) per share—basic	$	0.67	$	0.14	$	(1.85)
Net income (loss) per share—diluted	$	0.66	$	0.14	$	(1.85)
Weighted average shares used in computing net income per share—basic:		159,427		156,023		152,634
Weighted average shares used in computing net income per share—diluted:		160,655		156,023		152,634

The accompanying notes are an integral part of these consolidated financial statements.

F-5

Ironwood Pharmaceuticals, Inc.
Consolidated Statements of Comprehensive Income (Loss)
(In thousands)

	Years Ended December 31,
	2020		2019		2018
Net income (loss)	$	106,176	$	21,505	$	(282,368)
Other comprehensive income:
Unrealized gains on available-for-sale securities		—		—		79
Total other comprehensive income		—		—		79
Comprehensive income (loss)	$	106,176	$	21,505	$	(282,289)

The accompanying notes are an integral part of these consolidated financial statements.

F-6

Ironwood Pharmaceuticals, Inc.

Consolidated Statements of Stockholders’ Equity (Deficit)

(In thousands, except share amounts)

											Accumulated
	Class A			Class B			Additional				other		Total
	Common Stock			Common Stock			paid-in		Accumulated		comprehensive		Stockholders’
	Shares	Amount		Shares	Amount		capital		deficit		income (loss)		equity (deficit)
Balance at December 31, 2017	136,465,526		137	13,983,762		14		1,318,536		(1,308,760)		(79)		9,848
Issuance of common stock related to share-based awards and employee stock purchase plan	3,201,042		3	764,361		—		32,058		—		—		32,061
Conversion of Class B Common Stock to Class A Common Stock	14,748,123		14	(14,748,123)		(14)		—		—		—		—
Share-based compensation expense related to share-based awards to non-employees	—		—	—		—		—		—		—		—
Share-based compensation expense related to share-based awards to employees and employee stock purchase plan	—		—	—		—		44,009		—		—		44,009
Unrealized gains on available-for-sale securities	—		—	—		—		—		—		79		79
Net loss	—		—	—		—		—		(282,368)		—		(282,368)
Balance at December 31, 2018	154,414,691		154	—		—		1,394,603		(1,591,128)		—		(196,371)
Issuance of common stock related to share-based awards and employee stock purchase plan, net of cancellations	3,121,271		4	—		—		13,597		—		—		13,601
Share-based compensation expense related to share-based awards and employee stock purchase plan	—		—	—		—		32,331		—		—		32,331
Equity component of convertible senior notes	—		—	—		—		92,502		—		—		92,502
Equity component of issuance costs for convertible senior notes	—		—	—		—		(2,092)		—		—		(2,092)
Purchase of capped calls	—		—	—		—		(25,159)		—		—		(25,159)
Equity component of partial repurchase of 2022 Convertible Notes	—		—	—		—		(26,959)		—		—		(26,959)
Dividend of SGC business	—		—	—		—		—		(2,609)		—		(2,609)
Net income	—		—	—		—		—		21,505		—		21,505
Balance at December 31, 2019	157,535,962	$	158	—	$	—	$	1,478,823	$	(1,572,232)	$	—	$	(93,251)

The accompanying notes are an integral part of these consolidated financial statements.

F-7

Ironwood Pharmaceuticals, Inc.

Consolidated Statements of Stockholders’ Equity (Deficit)

(In thousands, except share amounts)

	Class A			Additional				Total
	Common Stock			paid-in		Accumulated		Stockholders’
	Shares	Amount		capital		deficit		equity (deficit)
Balance at December 31, 2019	157,535,962		158		1,478,823		(1,572,232)		(93,251)
Issuance of common stock related to share-based awards and employee stock purchase plan	3,080,713		3		18,537		—		18,540
Share-based compensation expense related to share-based awards and employee stock purchase plan	—		—		31,175		—		31,175
Net income	—		—		—		106,176		106,176
Balance at December 31, 2020	160,616,675	$	161	$	1,528,535	$	(1,466,056)	$	62,640

The accompanying notes are an integral part of these consolidated financial statements.

F-8

Ironwood Pharmaceuticals, Inc.

Consolidated Statements of Cash Flows

(In thousands)

	Year Ended December 31,
	2020		2019		2018
Cash flows from operating activities:
Net income (loss)	$	106,176	$	21,505	$	(282,368)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization		3,564		5,580		3,859
Amortization of acquired intangible assets		—		—		8,111
Impairment of intangible assets		—		—		151,794
Loss (gain) on disposal of property and equipment		470		146		(1,867)
Share-based compensation expense		31,175		31,278		40,526
Gain on lease modification		—		(3,169)		—
Change in fair value of note hedge warrants		(12,172)		16,232		(58,425)
Change in fair value of convertible note hedges		18,301		(19,255)		67,168
Write-down of commercial supply and inventory to net realizable value and (settlement) loss on non-cancellable purchase commitments		—		(3,530)		219
Write-down of excess non-cancellable ZURAMPIC and DUZALLO sample purchase commitments		—		—		390
Accretion of discount/premium on investment securities		—		—		(165)
Non-cash interest expense		22,263		19,590		17,601
Non-cash change in fair value of contingent consideration		—		—		(31,045)
Loss on extinguishment of debt		—		30,977		—
Changes in assets and liabilities:
Accounts receivable and related party accounts receivable, net		4,091		(68,893)		1,207
Inventory, net		648		—		(806)
Prepaid expenses and other current assets		1,515		(1,046)		(3,727)
Operating lease right-of-use assets		1,167		14,141		—
Other assets		(153)		159		702
Accounts payable, related party accounts payable and accrued expenses		(7,523)		(32,700)		2,678
Accrued research and development costs		(1,058)		(483)		542
Operating lease liabilities		218		(12,046)		—
Deferred revenue		(875)		875		—
Deferred rent		—		—		916
Other liabilities		1,029		—		—
Net cash provided by (used in) continuing operating activities		168,836		(639)		(82,690)
Net cash provided by discontinued operating activities		—		11,364		11,808
Net cash provided by (used in) operating activities		168,836		10,725		(70,882)
Cash flows from investing activities:
Purchases of available-for-sale securities		—		—		(3,241)
Sales and maturities of available-for-sale securities		—		—		99,165
Purchases of property and equipment		(1,842)		(7,189)		(351)
Proceeds from sale of property and equipment		—		268		1,563
Net cash (used in) provided by continuing investing activities		(1,842)		(6,921)		97,136
Net cash used in discontinued investing activities		—		(4,223)		(8,270)
Net cash (used in) provided by investing activities		(1,842)		(11,144)		88,866
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes		—		400,000		—
Purchase of capped calls		—		(25,159)		—
Proceeds from partial termination of convertible note hedges and note hedge warrants		—		3,174		—
Costs associated with issuance of convertible senior notes		—		(9,048)		—
Proceeds from exercise of stock options and employee stock purchase plan		18,546		13,595		32,061
Payments on capital lease obligations		—		—		(1,824)
Payments for partial repurchase of 2022 Convertible Notes		—		(227,338)		—
Payments on 8.375% Notes due 2026		—		(156,409)		—
Payments on contingent purchase price consideration		—		—		(165)
Net cash provided by (used in) continuing financing activities		18,546		(1,185)		30,072
Net cash used in discontinued financing activities		—		—		—
Net cash provided by (used in) financing activities		18,546		(1,185)		30,072
Net increase (decrease) in cash, cash equivalents and restricted cash		185,540		(1,604)		48,056
Cash, cash equivalents and restricted cash, beginning of period		179,244		180,848		132,792
Cash, cash equivalents and restricted cash, end of period	$	364,784	$	179,244	$	180,848
Reconciliation of cash, cash equivalents, and restricted cash to the consolidated balance sheets

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Cash and cash equivalents	$	362,564	$	177,023	$	173,172
Restricted cash		2,220		2,221		7,676
Total cash, cash equivalents, and restricted cash	$	364,784	$	179,244	$	180,848
Supplemental cash flow disclosure:
Cash paid for interest	$	7,216	$	17,584	$	18,235
Cash paid for income taxes	$	1,848	$	—	$	—
Non-cash investing and financing activities
Purchases under capital leases	$	—	$	—	$	664
Extinguishment of capital leases	$	—	$	—	$	2,687
Recognition of asset retirement obligation	$	—	$	486	$	—
Fixed asset purchases in accounts payable and accrued expenses	$	—	$	1,282	$	439

The accompanying notes are an integral part of these consolidated financial statements.

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Ironwood Pharmaceuticals, Inc.

Notes to Consolidated Financial Statements

1. Nature of Business

Ironwood Pharmaceuticals, Inc. (“Ironwood” or the “Company”) is a gastrointestinal (“GI”) healthcare company dedicated to advancing the treatment of GI diseases and redefining the standard of care for GI patients. The Company is focused on the development and commercialization of innovative GI product opportunities in areas of significant unmet need, leveraging its demonstrated expertise and capabilities in GI diseases.

LINZESS^® (linaclotide), the Company’s commercial product, is the first product approved by the United States Food and Drug Administration (the “U.S. FDA”) in a class of GI medicines called guanylate cyclase type C agonists and is indicated for adult men and women suffering from irritable bowel syndrome with constipation (“IBS-C”) or chronic idiopathic constipation (“CIC”). LINZESS is available to adult men and women suffering from IBS-C or CIC in the United States (the “U.S.”) and Mexico and to adult men and women suffering from IBS-C in Japan and China. Linaclotide is available under the trademarked name CONSTELLA^® to adult men and women suffering from IBS-C or CIC in Canada and to adult men and women suffering from IBS-C in certain European countries.

The Company has strategic partnerships with leading pharmaceutical companies to support the development and commercialization of linaclotide throughout the world. The Company and its partner, AbbVie Inc. (together with its affiliates, “AbbVie”) (successor to Allergan plc (together with its affiliates), “Allergan”), began commercializing LINZESS in the U.S. in December 2012. Under the Company’s collaboration with AbbVie for North America, total net sales of LINZESS in the U.S., as recorded by AbbVie, are reduced by commercial costs incurred by each party, and the resulting amount is shared equally between the Company and AbbVie. AbbVie also has an exclusive license from the Company to develop and commercialize linaclotide in all countries other than China (including Hong Kong and Macau), Japan and the countries and territories of North America (the “AbbVie License Territory”). On a country-by-country and product-by-product basis in the AbbVie License Territory, AbbVie pays the Company a royalty as a percentage of net sales of products containing linaclotide as an active ingredient. In addition, AbbVie has exclusive rights to commercialize linaclotide in Canada as CONSTELLA and in Mexico as LINZESS.

Astellas Pharma Inc. (“Astellas”), the Company’s partner in Japan, has an exclusive license to develop and commercialize linaclotide in Japan. In March 2017, Astellas began commercializing LINZESS for the treatment of adults with IBS-C in Japan, and in September 2018, Astellas began commercializing LINZESS for the treatment of adults with chronic constipation in Japan. In August 2019, the Company amended and restated its license agreement with Astellas. Effective in 2020, Company is no longer responsible for the supply of linaclotide active pharmaceutical ingredient (“API”) to Astellas (Note 6).

In October 2012, the Company and AstraZeneca AB (together with its affiliates) (“AstraZeneca”) entered into a collaboration agreement to co-develop and co-commercialize linaclotide in China (including Hong Kong and Macau) (the “AstraZeneca License Territory”). In September 2019, the Company amended and restated its existing collaboration agreement with AstraZeneca whereby AstraZeneca obtained the exclusive right to develop, manufacture, and commercialize products containing linaclotide in the AstraZeneca License Territory (Note 6). In November 2019, AstraZeneca began commercializing LINZESS for the treatment of adults with IBS-C in China.

The Company and AbbVie are exploring ways to enhance the clinical profile of LINZESS by studying linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions. In September 2020, based on the Phase IIIb data demonstrating efficacy and safety of LINZESS 290 mcg on the overall abdominal symptoms of bloating, pain and discomfort in adult patients with IBS-C, the U.S. FDA approved the Company’s Supplemental New Drug Application to include a more comprehensive description of the effects of LINZESS in its approved label. In June 2020 and July 2020, the United States Patent and Trademark Office granted patents covering the formulation of the 72 mcg dose of LINZESS and methods of using the formulation, respectively. The patents are expected to expire in 2031.

The Company and AbbVie were developing MD-7246, a delayed release formulation of linaclotide. In May 2020, the Company and AbbVie announced top-line data from a Phase II trial evaluating MD-7246 in adult patients with

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abdominal pain associated with irritable bowel syndrome with diarrhea. The Phase II trial did not meet its primary or key secondary endpoints. Based on these findings, the Company and AbbVie discontinued the development of MD-7246.

The Company was developing IW-3718, a gastric retentive formulation of a bile acid sequestrant, in a Phase III program. In September 2020, the Company announced that one of its two identical Phase III trials for the potential treatment of refractory gastroesophageal reflux disease (“refractory GERD”) did not meet the pre-specified criteria associated with a planned early efficacy assessment. Based on these findings, the Company is discontinuing development of IW-3718. In connection with this decision, the Company reduced its workforce by approximately 100 full-time employees. This workforce reduction affected both field-based and home-office employees, including the relevant general and administrative support functions. The Company substantially completed the reduction in its workforce in the fourth quarter of 2020 (Note 18).

Additionally, the Company periodically enters into co-promotion agreements to bolster its salesforce productivity. In August 2019, the Company entered into a disease education and promotional agreement with Alnylam Pharmaceuticals, Inc. (“Alnylam”) for Alnylam’s GIVLAARI^® (givosiran) for the treatment of acute hepatic porphyria (“AHP”). Under the agreement, the Company performs disease awareness activities related to AHP and sales detailing activities of GIVLAARI.

These and other agreements are more fully described in Note 6, Collaboration, License, Co-Promotion and Other Commercial Agreements, to these consolidated financial statements.

On April 1, 2019, Ironwood completed the separation (the “Separation”) of its soluble guanylate cyclase (“sGC”) business, and certain other assets and liabilities, into Cyclerion Therapeutics, Inc (“Cyclerion”). The Separation was effected by means of a distribution of all of the outstanding shares of common stock, with no par value, of Cyclerion through a dividend of all outstanding shares of Cyclerion’s common stock, to Ironwood’s stockholders of record as of the close of business on March 19, 2019 (Note 3).

The Company was incorporated in Delaware on January 5, 1998 as Microbia, Inc. On April 7, 2008, the Company changed its name to Ironwood Pharmaceuticals, Inc. To date, the Company has dedicated a majority of its activities to the research, development and commercialization of linaclotide, as well as to the research and development of its other product candidates. Prior to the year ended December 31, 2019, the Company incurred net losses in each year since its inception in 1998. For the years ended December 31, 2020 and 2019, the Company recorded net income of approximately $106.2 million and approximately $21.5 million, respectively. As of December 31, 2020, the Company had an accumulated deficit of approximately $1.5 billion.

2. Summary of Significant Accounting Policies

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Ironwood and its wholly-owned subsidiaries, as of December 31, 2020, Ironwood Pharmaceuticals Securities Corporation and Ironwood Pharmaceuticals GmbH. Cyclerion was a wholly-owned subsidiary until it became an independent publicly-traded company on April 1, 2019. All intercompany transactions and balances are eliminated in consolidation.

Segment Information

Operating segments are components of an enterprise for which separate financial information is available and is evaluated regularly by the Company’s chief operating decision-maker in deciding how to allocate resources and in assessing performance. The Company currently operates in one reportable business segment—human therapeutics.

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Reclassifications

Certain prior period financial statement items have been reclassified to conform to current period presentation.

Discontinued Operations

The Company determined that its sGC business, which was disposed on April 1, 2019, met the criteria for classification as a discontinued operation in accordance with Accounting Standards Codification (“ASC”) Subtopic 205-20, Discontinued Operations (“ASC 205-20”). Accordingly, the accompanying consolidated financial statements as of and for the year ended December 31, 2019 and all prior periods present the balance sheet, operations, and cash flows associated with the sGC business as discontinued operations. For additional information related to discontinued operations, refer to Note 3, Cyclerion Separation, to these consolidated financial statements.

Use of Estimates

The preparation of consolidated financial statements in accordance with U.S. generally accepted accounting principles requires the Company’s management to make estimates and judgments that may affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the amounts of revenues and expenses during the reported periods. On an ongoing basis, the Company’s management evaluates its estimates, judgments and methodologies. Significant estimates and assumptions in the consolidated financial statements include those related to revenue recognition; accounts receivable; inventory valuation and related reserves; useful lives of long-lived assets, impairment of long-lived assets, including its acquired intangible assets and goodwill; valuation procedures for right-of-use assets and operating lease liabilities; valuation procedures for the issuance and repurchase of convertible notes; balance sheet classification of convertible notes; valuation of assets and liabilities held for disposition and losses related to discontinued operations; fair value of derivatives; income taxes, including the valuation allowance for deferred tax assets; research and development expenses; contingencies and share-based compensation. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ materially from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

Cash and Cash Equivalents

The Company considers all highly liquid investment instruments with a remaining maturity when purchased of three months or less to be cash equivalents. Investments qualifying as cash equivalents primarily consist of money market funds, U.S. government-sponsored securities, and repurchase agreements. The carrying amount of cash equivalents approximates fair value. The amount of cash equivalents included in cash and cash equivalents was approximately $349.0 million and approximately $177.0 million at December 31, 2020 and 2019, respectively.

Restricted Cash

The Company is contingently liable under unused letters of credit with a bank, related to the Company’s facility lease and vehicle lease agreements, in the amount of approximately $2.2 million as of December 31, 2020 and 2019. The Company records as restricted cash the collateral used to secure these letters of credit. The amount of restricted cash included in current assets and non-current assets was approximately $1.7 million and $0.5 million at December 31, 2020, respectively. The amount of restricted cash in current assets and non-current assets was approximately $1.2 million and $1.0 million at December 31, 2019, respectively.

Concentrations of Suppliers

The Company relies on its collaboration partners and their suppliers to manufacture linaclotide API, linaclotide finished drug product, and finished goods.

If any of the Company’s collaboration partners and their suppliers were to limit or terminate production or otherwise fail to meet the quality or delivery requirements needed to satisfy the supply commitments, the process of locating and qualifying alternate sources could require up to several months, during which time production could be

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delayed. Such delays could have a material adverse effect on the Company’s business, financial position and results of operations.

Accounts Receivable and Related Valuation Account

The Company makes judgments as to its ability to collect outstanding receivables and provides an allowance for credit losses when collection becomes doubtful. Provisions are made based upon a specific review of all significant outstanding invoices and the overall quality and age of those invoices not specifically reviewed. The Company’s receivables relate primarily to amounts reimbursed under its collaboration, license and co-promotion agreements. The Company believes that credit risks associated with these partners are not significant. The Company reviews the need for an allowance for credit losses for its receivables based on various factors including payment history and historical bad debt experience. The Company had no allowance for credit losses as of December 31, 2020 or 2019.

Concentrations of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents, restricted cash, and accounts receivable. The Company maintains its cash and cash equivalent balances with high-quality financial institutions and the Company believes that such funds are subject to minimal credit risk. The Company has adopted an investment policy which limits the amounts the Company may invest in certain types of investments, and requires all investments held by the Company to be at least AA- rated, thereby reducing credit risk exposure.

Accounts receivable primarily consist of amounts due under the linaclotide collaboration agreement with AbbVie for North America (Note 6). The Company does not obtain collateral for its accounts receivable. The Company previously reflected amounts due from Allergan, net of amounts payable to Allergan, prior to its acquisition by AbbVie as related party accounts receivable, net. Following the acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company (Note 17).

The percentages of revenue recognized from significant collaborative partners of the Company in the years ended December 31, 2020, 2019 and 2018 as well as the account receivable balances, net of any payables due, at December 31, 2020 and 2019 are included in the following table:

	Accounts Receivable				Revenue
	December 31,				Year Ended December 31,
	2020		2019		2020		2019		2018
Collaborative Partner:
AbbVie (North America and Europe)	76	%	90	%	96	%	78	%	77	%
Astellas (Japan)	1	%	8	%	1	%	13	%	20	%

For the years ended December 31, 2020, 2019 and 2018, no additional customers accounted for more than 10% of the Company’s revenue.

Property and Equipment

Property and equipment, including leasehold improvements, are recorded at cost, and are depreciated when placed into service using the straight-line method based on their estimated useful lives as follows:

	Estimated Useful Life
Asset Description	(In Years)
Laboratory equipment	5
Computer and office equipment	3
Furniture and fixtures	7
Software	3

Included in property and equipment are certain costs of software obtained for internal use. Costs incurred during the preliminary project stage are expensed as incurred, while costs incurred during the application development stage are capitalized and amortized over the estimated useful life of the software. The Company also capitalizes costs

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related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Maintenance and training costs related to software obtained for internal use are expensed as incurred.

Leasehold improvements are amortized over the shorter of the estimated useful life of the asset or the lease term.

Costs for capital assets not yet placed into service have been capitalized as construction in process, and will be depreciated in accordance with the above guidelines once placed into service. Maintenance and repair costs are expensed as incurred.

Finite Lived Intangible Assets

The Company records the fair value of purchased intangible assets with finite useful lives as of the transaction date of a business combination. Purchased intangible assets with finite useful lives are amortized to their estimated residual values over their estimated useful lives. The value of the Company’s finite-lived intangible assets was based on the future expected net cash flows related to ZURAMPIC and DUZALLO (the “Lesinurad Products”), which included significant assumptions around future net sales and the respective investment to support these products. During the year ended December 31, 2018, the Company recorded an impairment charge of approximately $151.8 million to fully write-off its ZURAMPIC and DUZALLO intangible assets.

Impairment of Long-Lived Assets

The Company regularly reviews the carrying amount of its long-lived assets to determine whether indicators of impairment may exist, which warrant adjustments to carrying values or estimated useful lives. If indications of impairment exist, projected future undiscounted cash flows associated with the asset are compared to the carrying amount to determine whether the asset’s value is recoverable. If the carrying value of the asset exceeds such projected undiscounted cash flows, the asset will be written down to its estimated fair value.

Income Taxes

The Company provides for income taxes under the asset and liability method. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates in effect when the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance to reflect the uncertainty associated with their ultimate realization.

The Company accounts for uncertain tax positions recognized in the consolidated financial statements in accordance with the provisions of ASC Topic 740, Income Taxes, by prescribing a more-likely-than-not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. When uncertain tax positions exist, the Company recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. The determination as to whether the tax benefit will more likely than not be realized is based upon the technical merits of the tax position as well as consideration of the available facts and circumstances. The Company evaluates uncertain tax positions on a quarterly basis and adjusts the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions. Any changes to these estimates, based on the actual results obtained and/or a change in assumptions, could impact the Company’s income tax provision in future periods. Interest and penalty charges, if any, related to unrecognized tax benefits would be classified as a provision for income tax in the Company’s consolidated statement of operations.

Financing Costs

Financing costs include costs directly attributable to the Company’s offerings of its equity securities and its debt financings. Costs attributable to equity offerings are charged as a reduction to stockholders’ equity against the proceeds of the offering once the offering is completed. Costs attributable to debt financings are deferred and amortized to interest expense over the term of the debt using the effective interest method. Costs incurred in connection with convertible debt securities are allocated between the liability and equity components. In accordance with ASC 835, Interest, the Company presents debt issuance costs on the balance sheet as a direct deduction from the associated debt liability.

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Leases

Effective January 1, 2019, the Company adopted ASC Topic 842, Leases (“ASC 842”), using the optional transition method. The adoption of ASC 842 represented a change in accounting principle that aimed to increase transparency and comparability among organizations by requiring the recognition of right-of-use assets and lease liabilities on the balance sheet for both operating and finance leases. In addition, the standard required enhanced disclosures that meet the objective of enabling financial statement users to assess the amount, timing, and uncertainty of cash flows arising from leases.

As part of the ASC 842 adoption, the Company elected certain practical expedients, which include:

● Accounting policy election to use the short-term lease exception by asset class; and

● Election of the practical expedient package during transition, which includes:

o An entity need not reassess whether any expired or existing contracts are or contain leases.

o An entity need not reassess the classification for any expired or existing leases. As a result, all leases that were classified as operating leases in accordance with ASC 840 are classified as operating leases under ASC 842, and all leases that were classified as capital leases in accordance with ASC 840 are classified as finance leases under ASC 842.

o An entity need not reassess initial direct costs for any existing leases.

Subsequent to the Company’s adoption of ASC 842, the Company elected the post-transition practical expedient, by class of underlying asset, to account for lease components and non-lease components together as a single component for the asset class of operating lease right-of-use real estate assets.

The Company’s lease portfolio for the year ended December 31, 2020 included: a lease for its headquarters location, a data center colocation lease, vehicle leases for its salesforce representatives, and leases for computer and office equipment. The Company determines if an arrangement is a lease at the inception of the contract. The asset component of the Company’s operating leases is recorded as operating lease right-of-use assets, and the liability component is recorded as current portion of operating lease liabilities and operating lease liabilities, net of current portion in the Company’s consolidated balance sheets. As of December 31, 2020, the Company did not record any finance leases.

Right-of-use assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the lease inception date. Existing leases in the Company’s lease portfolio as of the adoption date were valued as of January 1, 2019. The Company uses an incremental borrowing rate based on the information available at lease inception in determining the present value of lease payments, if an implicit rate of return is not provided with the lease contract. Operating lease right-of-use assets are adjusted for incentives expected to be received.

Right-of-use assets and operating lease liabilities are remeasured upon certain modifications to leases using the present value of remaining lease payments and estimated incremental borrowing rate upon lease modification.

Lease cost is recognized on a straight-line basis over the lease term, and includes amounts related to short-term leases. The Company recognizes variable lease payments as operating expenses in the period in which the obligation for those payments is incurred. Variable lease payments primarily include common area maintenance, utilities, real estate taxes, insurance, and other operating costs that are passed on from the lessor in proportion to the space leased by the Company.

Derivative Assets and Liabilities

In June 2015, the Company issued 2.25% Convertible Senior Notes due June 15, 2022 (the “2022 Convertible Notes”) and in August 2019, the Company issued 0.75% Convertible Senior Notes due 2024 (the “2024 Convertible Notes”) and 1.50% Convertible Senior Notes due 2026 (the “2026 Convertible Notes”) (together with the “2022 Convertible Notes” and the “2024 Convertible Notes”, the “Convertible Senior Notes”). In June 2015, in connection with the issuance of the 2022 Convertible Notes, the Company entered into convertible note hedge transactions (the “Convertible Note Hedges”). Concurrently with entering into the Convertible Note Hedges, the Company also entered into certain warrant transactions in which it sold note hedge warrants (the “Note Hedge Warrants”) to the Convertible

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Note Hedge counterparties to acquire shares of the Company’s Class A Common Stock, subject to customary anti-dilution adjustments (Note 11). In connection with the partial repurchase of the 2022 Convertible Notes in August 2019, the Company terminated its Convertible Note Hedges and Note Hedge Warrants proportionately. These instruments are derivative financial instruments under ASC Topic 815, Derivatives and Hedging (“ASC 815”).

These derivatives are recorded as assets or liabilities at fair value each reporting date and the fair value is determined using the Black-Scholes option-pricing model. The changes in fair value are recorded as a component of other (expense) income in the consolidated statements of operations. Significant inputs used to determine the fair value include the price per share of the Company’s Class A Common Stock on the date of valuation, expected term of the derivative instruments, strike prices of the derivative instruments, risk-free interest rate, and expected volatility of the Company’s Class A Common Stock. Changes to these inputs could materially affect the valuation of the Convertible Note Hedges and Note Hedge Warrants in future periods.

In August 2019, in connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into the Capped Calls. The Capped Calls cover the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes (subject to anti-dilution and certain other adjustments). These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met.

Revenue Recognition

The Company’s revenues are generated primarily through collaborative arrangements and license agreements related to the research and development and commercialization of linaclotide, as well as co-promotion arrangements in the U.S. The terms of the collaborative research and development, license, co-promotion and other agreements contain multiple performance obligations which may include (i) licenses, (ii) research and development activities, including participation on joint steering committees, (iii) the manufacture of finished drug product, API, or development materials for a partner, which are reimbursed at a contractually determined rate, and (iv) education or co-promotion activities by the Company’s clinical sales specialists. Non-refundable payments to the Company under these agreements may include (i) up-front license fees, (ii) payments for research and development activities, (iii) payments for the manufacture of finished drug product, API, or development materials, (iv) payments based upon the achievement of certain milestones, (v) payments for sales detailing, promotional support services and medical education initiatives, and (vi) royalties on product sales. The Company receives its share of the net profits or bears its share of the net losses from the sale of linaclotide in the U.S. through its collaboration agreement with AbbVie for North America. The Company has adopted a policy to recognize revenue net of tax withholdings, as applicable.

Collaboration, License, Co-Promotion and Other Commercial Agreements

Upon licensing intellectual property to a customer, the Company determines if the license is distinct from the other performance obligations identified in the arrangement. The Company recognizes revenues from the transaction price, including non-refundable, up-front fees allocated to the license when the license is transferred to the customer if the license has distinct benefit to the customer. For licenses that are combined with other promises, the Company assesses the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time. For performance obligations that are satisfied over time, the Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

The Company’s license and collaboration agreements include milestone payments, such as development and other milestones. The Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method at the inception of the agreement. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within the control of the Company, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is then allocated to each performance obligation on a relative standalone selling price basis, for which the Company recognizes revenue as or when the performance obligations under the contract are satisfied. The Company re-evaluates the probability of achievement of such milestones and any related constraint at each reporting period, and any adjustments are recorded on a cumulative catch-up basis.

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Agreements that include the supply of API or drug product for either clinical development or commercial supply at the customer’s discretion are generally considered as options. The Company assesses if these options provide a material right to its partner, and if so, they are accounted for as separate performance obligations. If the Company is entitled to additional payments when the customer exercises these options, any additional payments are recorded as revenue when the customer obtains control of the goods, which is typically upon shipment for sales of API and finished drug product.

For agreements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company recognizes revenue when the related sales occur.

Net Profit or Net Loss Sharing

In accordance with ASC 808 Topic, Collaborative Arrangements (“ASC 808”), the Company considers the nature and contractual terms of the arrangement and the nature of the Company’s business operations to determine the classification of payments under the Company’s collaboration agreements. While ASC 808 provides guidance on classification, the standard is silent on matters of separation, initial measurement, and recognition. Therefore, the Company applies the separation, initial measurement, and recognition principles of ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”), as applicable.

The Company’s collaborative arrangements revenues generated from sales of LINZESS in the U.S. are considered akin to sales-based royalties. In accordance with the sales-based royalty exception, the Company recognizes its share of the pre-tax commercial net profit or net loss generated from the sales of LINZESS in the U.S. in the period the product sales are earned, as reported by AbbVie, and related cost of goods sold and selling, general and administrative expenses as incurred by the Company and AbbVie. These amounts are partially determined based on amounts provided by AbbVie and involve the use of estimates and judgments, such as product sales allowances and accruals related to prompt payment discounts, chargebacks, governmental and contractual rebates, wholesaler fees, product returns, and co-payment assistance costs, which could be adjusted based on actual results in the future. The Company is highly dependent on AbbVie for timely and accurate information regarding net revenues from sales of LINZESS in the U.S. in accordance with both ASC 808 and ASC 606, and the related costs, in order to accurately report its results of operations. If the Company does not receive timely and accurate information or incorrectly estimates activity levels associated with the collaboration at a given point in time, the Company could be required to record adjustments in future periods.

In accordance with ASC 606-10-55, Principal Agent Considerations, the Company records revenue transactions as net product revenue in its consolidated statements of operations if it is deemed the principal in the transaction, which includes being the primary obligor, retaining inventory risk, and control over pricing. Given that the Company is not the primary obligor and does not have the inventory risks in the collaboration agreement with AbbVie for North America, it records its share of the net profits or net losses from the sales of LINZESS in the U.S. on a net basis and presents the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. The Company and AbbVie settle the cost sharing quarterly such that the Company’s statements of operations reflect 50% of the pre-tax net profit or loss generated from sales of LINZESS in the U.S.

Product Revenue, Net

Product revenue consisted of sales of the Lesinurad Products, in the U.S. until the termination of the exclusive license to develop, manufacture, and commercialize in the U.S. products containing lesinurad as an active ingredient (the “Lesinurad License”) in January 2019. The Company sold the Lesinurad Products principally to a limited number of national wholesalers and selected regional wholesalers (the “Distributors”). The Distributors resold the Lesinurad Products to retail pharmacies and healthcare providers, who then sold to patients.

Net product revenue was recognized when the Distributor obtained control of the Company’s product, which occurred at a point in time, typically upon shipment of Lesinurad Products to the Distributor. When the Company performed shipping and handling activities after the transfer of control to the Distributor (e.g., when control transfers prior to delivery), they were considered fulfillment activities, and accordingly, the costs were accrued for when the related revenue was recognized. The Company expensed incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that the Company would have recognized was one year or less.

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The Company evaluated the creditworthiness of each of its Distributors to determine whether it was probable that a significant reversal in the amount of the cumulative revenue recognized would not occur. The Company calculated its net product revenue based on the wholesale acquisition cost that the Company charged its Distributors for the Lesinurad Products less variable consideration. The product revenue variable consideration consisted of estimates relating to (i) trade discounts and allowances, such as invoice discounts for prompt payment and distributor fees, (ii) estimated government and private payor rebates, chargebacks and discounts, such as Medicaid reimbursements, (iii) reserves for expected product returns and (iv) estimated costs of incentives offered to certain indirect customers including patients. These estimates would be adjusted based on actual results in the period such variances became known.

Product revenue was recorded net of the trade discounts, allowances, rebates, chargebacks, discounts, product returns, and other incentives. Certain of these adjustments were recorded as an accounts receivable reserve, while certain of these adjustments were recorded as accrued expenses.

Sale of Active Pharmaceutical Ingredient

During the years ended December 31, 2020, 2019, and 2018, the Company produced linaclotide API, finished drug product, finished goods, and/or development materials for certain of its partners. As of December 31, 2020, the Company is no longer responsible for the supply of linaclotide API, finished drug product, finished goods or development materials to its partners.

As it relates to development materials and API produced for Astellas, the Company was reimbursed at a contracted rate. Such reimbursements were considered as part of revenue generated pursuant to the Astellas license agreement and are presented as collaborative arrangements revenue. Any linaclotide API, finished drug product, finished goods, and development materials AbbVie is responsible for producing for the U.S. are recognized in accordance with the cost-sharing provisions of the collaboration agreement with AbbVie for North America. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, any linaclotide API, finished drug product, and development materials produced for AstraZeneca for China (including Hong Kong and Macau) were recognized in accordance with the cost-sharing provisions of the AstraZeneca collaboration agreement.

The Company recognized revenue on linaclotide API, finished drug product, finished goods, and development materials when control has transferred to the partner, which generally occurs upon shipment after the material passed all quality testing required for acceptance by the partner.

Other

The Company’s deferred revenue balance consists of advance billings and payments received from customers in excess of revenue recognized.

Cost of Revenues

Cost of revenues includes cost related to the sales of linaclotide API and finished drug product, as well as the cost of product revenue related to sales of the Lesinurad Products in the U.S. Cost related to the sales of linaclotide API, finished drug product, and finished goods are generally recognized upon shipment to certain of the Company’s partners outside of the U.S. The Company’s cost of revenues for linaclotide consists of the internal and external costs of producing such API and finished drug product. Cost of product revenue related to the sales of the Lesinurad Products in the U.S. includes the cost of producing finished goods that correspond with product revenue for the reporting period, such as third-party supply and overhead costs, as well as certain period costs related to freight, packaging, stability and quality testing, and customer acquisition.

Research and Development Costs

The Company generally expenses research and development costs to operations as incurred. The Company capitalizes nonrefundable advance payments made by the Company for research and development activities and defers expense recognition until the related goods are received or the related services are performed.

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Research and development expenses are comprised of costs incurred in performing research and development activities, including salary, benefits, share-based compensation, and other employee-related expenses; laboratory supplies and other direct expenses; facilities expenses; overhead expenses; third-party contractual costs relating to nonclinical studies and clinical trial activities and related contract manufacturing expenses, development of manufacturing processes and regulatory registration of third-party manufacturing facilities; licensing fees for the Company’s product candidates; and other outside expenses.

The Company has certain collaboration agreements pursuant to which it shares or has shared research and development expenses related to linaclotide. The Company records expenses incurred under such linaclotide collaboration arrangements as research and development expense. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, under the Company’s collaboration agreement with AstraZeneca for China (including Hong Kong and Macau), the Company was reimbursed for certain research and development expenses and it netted these reimbursements against its research and development expenses as incurred. In connection with the execution of the Amended AstraZeneca Agreement, AstraZeneca is fully responsible for all research and development costs incurred related to the development, manufacture, and commercialization of linaclotide in China (including Hong Kong and Macau). Under the Company’s collaboration agreement with AbbVie for North America, the Company is reimbursed for certain research and development expenses and nets these reimbursements against its research and development expenses as incurred. Amounts owed to AbbVie or AstraZeneca under the Company’s respective collaboration agreements were recorded as incremental research and development expense.

Restructuring Expenses

Restructuring expenses are comprised primarily of costs associated with exit and disposal activities in accordance with ASC 420, Exit or Disposal Cost Obligations, and include one-time termination benefits and contract-related costs. Such costs are based on estimates of fair value in the period liabilities are incurred. The Company evaluates and adjusts these costs for changes in circumstances as additional information becomes available.

Selling, General and Administrative Expenses

The Company expenses selling, general and administrative costs to operations as incurred. Selling, general and administrative expenses consist primarily of compensation, benefits and other employee-related expenses for personnel in the Company’s administrative, finance, legal, information technology, business development, commercial, sales, marketing, communications and human resource functions. Other costs include the legal costs of pursuing patent protection of the Company’s intellectual property, general and administrative related facility costs, insurance costs and professional fees for accounting, tax, consulting, legal and other services.

Prior to the execution of the Amended AstraZeneca Agreement, the Company was reimbursed for certain selling, general and administrative expenses and the Company netted these reimbursements against the Company’s selling, general and administrative expenses as incurred. In connection with the Amended AstraZeneca Agreement, effective in September 2019, AstraZeneca will be fully responsible for all costs related to the development, manufacture, and commercialization of linaclotide in China (including Hong Kong and Macau). The Company includes AbbVie’s selling, general and administrative cost-sharing payments in the calculation of the net profits and net losses from the sale of LINZESS in the U.S. and presents the net payment to or from AbbVie as collaboration expense or collaborative arrangements revenue, respectively.

Share-Based Compensation Expense

The Company grants awards under its share-based compensation programs, including stock awards, restricted stock awards (“RSAs”), restricted stock units (“RSUs”) (including both time-based and performance-based RSUs), stock options, and shares issued under the Company’s employee stock purchase plan (“ESPP”). Share-based compensation is recognized as expense in the consolidated statements of operations based on the grant date fair value over the requisite service period, net of estimated forfeitures. The Company estimates forfeitures over the requisite service period using historical forfeiture activity and records share-based compensation expense only for those awards that are expected to vest.

The Company estimates the fair value of stock options using the Black-Scholes option-pricing model, which requires the use of subjective assumptions including volatility and expected term, among others. The fair value of stock

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awards, RSAs, and RSUs is based on the market value of the Company’s Class A Common Stock on the date of grant, with the exception of performance-based RSUs with market conditions, which are measured using the Monte Carlo simulation method on the date of grant (Note 14). Discounted stock purchases under the Company’s ESPP are valued on the first date of the offering period using the Black-Scholes option-pricing model to compute the fair value of the lookback provision plus the purchase discount.

For awards that vest based on service conditions and market conditions, the Company uses a straight-line method to recognize compensation expense over the respective service period. For awards that contain performance conditions, the Company determines the appropriate amount to expense at each reporting date based on the anticipated achievement of performance targets, which requires judgement, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, the Company records a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, the Company re-assesses the estimated performance and updates the number of performance-based awards that it believes will ultimately vest. Discounted stock purchases under the Company’s ESPP are recognized over the offering period.

Compensation expense related to modified awards is measured based on the fair value for the awards as of the modification date. Any incremental compensation expense arising from the excess of the fair value of the awards on the modification date compared to the fair value of the awards immediately before the modification date is recognized at the modification date or ratably over the requisite remaining service period, as appropriate.

While the assumptions used to calculate and account for share-based compensation awards represent management’s best estimates, these estimates involve inherent uncertainties and the application of management’s judgment. As a result, if revisions are made to the Company’s underlying assumptions and estimates, the Company’s share-based compensation expense could vary significantly from period to period.

Patent Costs

The Company incurred and recorded as operating expense legal and other fees related to patents of approximately $2.3 million, approximately $7.8 million, and approximately $5.0 million for the years ended December 31, 2020, 2019 and 2018, respectively. These costs were charged to selling, general and administrative expenses as incurred.

Net Income (Loss) Per Share

Basic net income (loss) per common share is computed by dividing the net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed by dividing net income (loss) by the diluted number of shares outstanding during the period. Except where the result would be antidilutive to net income (loss), diluted net income (loss) per common share is computed assuming the conversion of the 2022 Convertible Notes, the 2024 Convertible Notes and the 2026 Convertible Notes, the exercise of outstanding common stock options and the vesting of RSUs and RSAs (using the treasury stock method), as well as their related income tax effects.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions, and other events and circumstances from non-owner sources and consists of net income (loss) and changes in unrealized gains and losses on available-for-sale debt securities in the periods presented in the Company’s consolidated statements of comprehensive income (loss).

Subsequent Events

The Company considers events or transactions that have occurred after the balance sheet date of December 31, 2020, but prior to the filing of the financial statements with the Securities and Exchange Commission (“SEC”) to provide additional evidence relative to certain estimates or to identify matters that require additional recognition or disclosure. Subsequent events have been evaluated through the filing of the financial statements accompanying this Annual Report on Form 10-K.

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New Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (the “FASB”) or other standard setting bodies that are adopted by the Company as of the specified effective date. Except as set forth below, the Company did not adopt any new accounting pronouncements during the year ended December 31, 2020 that had a material effect on its consolidated financial statements.

In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 changed how companies account for credit losses for most financial assets and certain other instruments. For trade receivables, loans and held-to-maturity debt securities, companies are required to recognize an allowance for credit losses rather than reducing the carrying value of the asset. Subsequent to the issuance of ASU 2016-13, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief (“ASU 2019-05”), ASU No. 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Date, ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, ASU No. 2020-02, Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) to provide additional guidance on the adoption of ASU 2016-13. Early adoption was permitted. The Company adopted these ASUs during the three months ended March 31, 2020. The adoption of these ASUs did not have a material impact on the Company’s financial position and results of operations.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350) (“ASU 2017-04”) to simplify the accounting for goodwill impairment by removing Step 2 of the goodwill impairment test and to eliminate the required quantitative analysis for reporting units with negative carrying value. ASU 2017-04 is effective for fiscal years beginning after December 15, 2019. Early adoption was permitted. The Company adopted ASU 2017-04 during the three months ended March 31, 2020. The adoption of ASU 2017-04 did not have a material impact on the Company’s financial position and results of operations.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework— Changes to the Disclosure Requirement for Fair Value Measurement (“ASU 2018-13”) which amends the disclosure requirements for fair value measurements. The amendments in ASU 2018-13 are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-13 during the three months ended March 31, 2020. The adoption of ASU 2018-13 did not have a material impact on the Company’s financial statement disclosures.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract (a consensus of the FASB Emerging Issues Task Force) (“ASU 2018-15”) which provides guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. ASU 2015-18 requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance to determine which implementation costs to capitalize as assets or expense as incurred. The internal-use software guidance requires that certain costs incurred during the application development stage be capitalized and other costs incurred during the preliminary project and post-implementation stages be expensed as they are incurred. A customer’s accounting for the hosting component of the arrangement is not affected by this guidance. The amendments in ASU 2018-15 are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-15 using the prospective transition method during the three months ended March 31, 2020. The adoption of ASU 2018-15 did not have a material impact on the Company’s financial position and results of operations.

In October 2018, the FASB issued ASU No. 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (“ASU 2018-17”). The update is intended to improve general purpose financial reporting by considering indirect interests held through related parties in common control arrangements on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. The amendments in ASU 2018-17 will be effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-17 during the three months ended

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March 31, 2020. The adoption of ASU 2018-17 did not have a material impact on the Company’s financial position and results of operations.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”), which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company is currently evaluating the potential impact that the adoption of ASU 2019-12 may have on the Company’s financial position and results of operations.

In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). The amendments in ASU 2020-06 simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. Under ASU 2020-06, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. These changes will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that was bifurcated under previously existing guidance. The new guidance also requires the if-converted method to be applied for all convertible instruments. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. Early adoption is permitted. The Company is currently evaluating the impact that the adoption of ASU 2020-06 may have on the Company’s financial position and results of operation.

Other recent accounting pronouncements issued, but not yet effective, are not expected to be applicable to the Company or have a material effect on the consolidated financial statements upon future adoption.

3. Cyclerion Separation

On April 1, 2019, Ironwood completed the separation of its sGC business, and certain other assets and liabilities, into Cyclerion. The Separation was effected by means of a distribution of all of the outstanding shares of common stock, with no par value, of Cyclerion through a dividend of Cyclerion’s common stock, to Ironwood’s stockholders of record as of the close of business on March 19, 2019. Prior to the Separation on April 1, 2019, as described in Note 1, Nature of Business, Cyclerion was a wholly owned subsidiary of the Company. On March 30, 2019, the Company entered into certain agreements with Cyclerion relating to the Separation, including a separation agreement, a tax matters agreement, and an employee matters agreement.

Agreements with Cyclerion

The separation agreement with Cyclerion, dated as of March 30, 2019, sets forth, among other things, the Company’s agreements with Cyclerion regarding the principal actions to be taken in connection with the Separation, including the dividend, which was effective as of April 1, 2019. The separation agreement identifies assets transferred, liabilities assumed by and contracts assigned to each of Cyclerion and Ironwood as part of the Separation, and provides for when and how these transfers, assumptions and assignments occur. The purpose of the separation agreement was to provide Cyclerion and Ironwood with assets to operate their respective businesses and retain or assume liabilities related to those assets.

F-23

The transfer of assets and liabilities to Cyclerion was effected through a contribution in accordance with the separation agreement as summarized below (in thousands):

		As of April 1, 2019
Assets:
Prepaid expenses and other current assets	$	1,169
Property and equipment, net		10,241
Other assets		21
	$	11,431
Liabilities:
Accrued research and development costs	$	5,673
Accrued expenses and other current liabilities		3,149
	$	8,822
Net Assets Transferred to Cyclerion	$	2,609

In addition, the Company received approximately $1.3 million during the year ended December 31, 2019 associated with tenant improvement reimbursement provisions related to the Cyclerion lease in accordance with the separation agreement.

The tax matters agreement, dated as of March 30, 2019, governs each party’s rights, responsibilities and obligations with respect to taxes, including taxes, if any, incurred as a result of any failure of the Separation to qualify as tax-free. In general, if the parties incur tax liabilities in the event that the Separation is not tax-free, each party is expected to be responsible for any taxes imposed on Ironwood or Cyclerion that arise from the failure of the Separation to qualify as a transaction that is generally tax-free for U.S. federal income tax purposes, under Sections 355 and 368(a)(1)(D) and certain other relevant provisions of the Internal Revenue Code of 1986, as amended, to the extent that the failure to so qualify is attributable to an acquisition of stock or assets of, or certain actions, omissions or failures to act of, such party. If both Ironwood and Cyclerion are responsible for such failure, liability will be shared according to relative fault. U.S. tax otherwise resulting from the failure of the Separation to qualify as a transaction that is tax-free generally will be the responsibility of Ironwood. Each party otherwise agreed to indemnify the other party from and against any liability for taxes allocated to such party under the tax matters agreement and any taxes resulting from breach of any such party’s covenants under the tax matters agreement, the separation agreement, or any ancillary agreement entered into in connection with the Separation. Cyclerion agreed to certain covenants that contain restrictions intended to preserve the tax-free status of the distribution and certain related transactions.

The employee matters agreement, dated as of March 30, 2019, allocates assets, liabilities and responsibilities relating to the employment, compensation, and employee benefits of Ironwood and Cyclerion employees, and other related matters in connection with the Separation, including the treatment of outstanding Ironwood incentive equity awards. Pursuant to the employee matters agreement, the outstanding Ironwood equity awards held by Cyclerion and Ironwood employees were adjusted in connection with the Separation, with the intent to maintain, immediately following the Separation, the economic value of the awards. No incremental stock-based compensation expense related to the Separation-related adjustments was recognized during the year ended December 31, 2019 (Note 14).

Additionally, the Company entered into two transition services agreements and a development agreement with Cyclerion.

Pursuant to the transition service agreements, the Company was obligated to provide and was entitled to receive certain transition services related to corporate functions, such as finance, procurement, facilities and development. As of December 31, 2020, both transition service agreements had terminated. Amounts received for services provided to Cyclerion were recorded as other income and amounts paid for services provided by Cyclerion were recorded as selling, general and administrative expense and research and development expense, as applicable. During the years ended December 31, 2020 and 2019, the Company recorded an insignificant amount and approximately $0.3 million, respectively, as other income for services provided to Cyclerion. During each of the years ended December 31, 2020 and 2019, the Company recorded an insignificant amount in both selling, general and administrative expense and research and development expense for services provided by Cyclerion, respectively.

F-24

Pursuant to the development agreement, Cyclerion is obligated to provide the Company with certain research and development services with respect to certain of Ironwood’s products and product candidates for an initial period of two years, unless earlier terminated or extended. Such research and development activities are governed by a joint steering committee comprised of representatives from both Cyclerion and Ironwood. Services received are paid at a mutually agreed upon rate. The Company recorded approximately $2.3 million and $4.5 million in research and development expenses under the development agreement during the years ended December 31, 2020 and 2019, respectively. The Company had an insignificant amount and approximately $1.5 million of accounts payable due to Cyclerion as of December 31, 2020 and 2019, respectively.

Discontinued Operations

Upon the Separation, the Company determined its sGC business qualified for discontinued operations accounting treatment in accordance with ASC 205-20. There were no discontinued operations during year ended December 31, 2020. The following is a summary of expenses of Cyclerion classified as discontinued operations for years ended December 31, 2019 and 2018 (in thousands):

	Year Ended December 31,
	2019		2018
Costs and expenses:
Research and development	$	21,792	$	65,443
Selling, general and administrative		15,646		21,615
Restructuring expenses		—		1,164
Net loss from discontinued operations	$	37,438	$	88,222

There were no assets or liabilities related to discontinued operations as of either December 31, 2020 or December 31, 2019, as all balances were transferred to Cyclerion upon Separation.

4. Net Income (Loss) Per Share

The following table sets forth the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):

	Year Ended December 31,
	2020		2019		2018
Numerator:
Net income (loss)	$	106,176	$	21,505	$	(282,368)
Denominator:
Weighted average number of common shares outstanding used in net income (loss) per share — basic		159,427		156,023		152,634
Effect of dilutive securities:
Stock options		367		—		—
Time-based restricted stock units		766		—		—
Performance-based restricted stock units		1		—		—
Restricted stock		94		—		—
Dilutive potential common shares
Weighted average number of common shares outstanding used in net income (loss) per share — diluted		160,655		156,023		152,634
Net income (loss) per share — basic		0.67		0.14		(1.85)
Net income (loss) per share — diluted	$	0.66	$	0.14	$	(1.85)

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The outstanding securities have been excluded from the computation of diluted weighted average shares outstanding, as applicable, as their effect would be anti-dilutive (in thousands):

	Year Ended December 31,
	2020	2019	2018
Stock options	11,746	17,194	20,457
Restricted stock awards	2	182	65
Time-based restricted stock units	209	3,207	3,058
Performance-based restricted stock units	93	—	—
Note Hedge Warrants	8,318	8,318	20,250
2022 Convertible Notes	8,318	8,318	20,250
2024 Convertible Notes	14,934	14,934	—
2026 Convertible Notes	14,934	14,934	—
	58,554	67,087	64,080

The potentially dilutive impact of the 2022 Convertible Notes, 2024 Convertible Notes and 2026 Convertible notes (together, the “Convertible Senior Notes”) (Note 11) is determined using the treasury stock method. Under this method, no numerator or denominator adjustments arise from the principal and interest components of the Convertible Senior Notes because the Company has the intent and ability to settle the Convertible Senior Notes’ principal and interest in cash. Instead, the Company is required to increase the diluted net income (loss) per share denominator by the variable number of shares that would be issued upon conversion if it settled the conversion spread obligation with shares. For diluted net income (loss) per share purposes, the conversion spread obligation is calculated based on whether the average market price of the Company’s Class A Common Stock during the reporting period is in excess of the conversion price of the Convertible Senior Notes. There was no calculated spread added to the denominator for the years ended December 31, 2020, 2019, or 2018.

5. Goodwill and Intangible Assets

The Company closed a transaction with AstraZeneca (the “Lesinurad Transaction”) on June 2, 2016 (the “Acquisition Date”) pursuant to which the Company received an exclusive license to develop, manufacture and commercialize the Lesinurad Products in the U.S. In August 2018, the Company delivered to AstraZeneca a notice of termination of the lesinurad license agreement, which termination was made with respect to all products under the lesinurad license agreement.

The value of the developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets as of the Acquisition Date was approximately $22.0 million and approximately $145.1 million, respectively. As of July 31, 2018, the accumulated amortization for developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets was approximately $3.6 million and approximately $11.7 million, respectively.

During the year ended December 31, 2018, the Company completed its initiative to evaluate the optimal mix of investments for the lesinurad franchise for uncontrolled gout using a comprehensive marketing mix in select test markets (with paired controls). Data from the test markets did not meet expectations. As a result, during the year ended December 31, 2018, the Company reduced its projected revenue and net cash flow assumptions associated with the value of its developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets. Accordingly, the Company evaluated its developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets for impairment and recorded an approximately $151.8 million impairment charge during the year ended December 31, 2018. The impairment assessment performed utilized the revised projected revenue and net cash flows assumed through the termination of the lesinurad license agreement, resulting in an impairment of the full carrying value of the intangible assets. The impairment charge was recorded as impairment of intangible assets in the Company’s consolidated statement of operations.

The Company tests its goodwill for impairment annually as of October 1^st, or more frequently if events or changes in circumstances indicate an impairment may have occurred (Note 2). There were no impairments of goodwill during the years ended December 31, 2020, 2019, and 2018.

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6. Collaboration, License, Co-Promotion and Other Commercial Agreements

For the year ended December 31, 2020, the Company had linaclotide collaboration agreements with AbbVie for North America and AstraZeneca for China (including Hong Kong and Macau), as well as linaclotide license agreements with Astellas for Japan and with AbbVie for the AbbVie License Territory. The Company also had an agreement with Alnylam to perform disease awareness activities for AHP and sales detailing activities for GIVLAARI. The following table provides amounts included in the Company’s consolidated statements of operations as collaborative arrangements revenue and sale of API primarily attributable to transactions from these arrangements (in thousands):

	Year Ended December 31,
Collaborative Arrangements Revenue	2020		2019		2018
Linaclotide Collaboration and License Agreements:
AbbVie (North America)	$	370,902	$	327,591	$	266,177
AbbVie (Europe and other)		2,196		1,718		1,146
AstraZeneca (China, including Hong Kong and Macau)		682		32,628		—
Astellas (Japan)		2,128		10,147		—
Co-Promotion and Other Agreements:
AbbVie (VIBERZI)(1)		—		3,723		4,290
Alnylam (GIVLAARI)		4,302		2,000		—
Other		1,335		1,845		1,226
Total collaborative arrangements revenue	$	381,545	$	379,652	$	272,839
Sale of API
Linaclotide Agreements:
Astellas (Japan)	$	2,017	$	45,788	$	69,599
AstraZeneca (China, including Hong Kong and Macau)		5,540		2,973		—
Other		421		—		756
Total sale of API	$	7,978	$	48,761	$	70,355

(1) The Company had an agreement with AbbVie to perform sales detailing activities for VIBERZI® (eluxadoline) which terminated as of December 31, 2019.

Accounts receivable, net, included approximately $145.8 million primarily related to collaborative arrangements revenue and sale of API, collectively, as of December 31, 2020, including approximately $110.9 million of accounts receivable, net, which includes approximately $4.3 million of accounts payable from the Company’s partner, AbbVie. Accounts receivable, net, included approximately $43.9 million related to collaborative arrangements revenue and sale of API, collectively, as of December 31, 2019.

The Company previously reflected amounts due from Allergan prior to its acquisition by AbbVie in May 2020 as related party accounts receivable. As of December 31, 2019, related party accounts receivable, net, included approximately $110.1 million related to collaborative arrangements revenue, net of approximately $4.1 million of related party accounts payable. Following acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company (Note 17).

At December 31, 2019, deferred revenue was approximately $0.9 million related to the disease education and promotional agreement with Alnylam. At December 31, 2020, no deferred revenue was recorded.

The Company routinely assesses the creditworthiness of its license and collaboration partners. The Company has not experienced any material losses related to receivables from its license or collaboration partners during the years ended December 31, 2020, 2019, or 2018.

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Linaclotide Agreements

Collaboration Agreement for North America with AbbVie

In September 2007, the Company entered into a collaboration agreement with AbbVie to develop and commercialize linaclotide for the treatment of IBS-C, CIC, and other GI conditions in North America. Under the terms of this collaboration agreement, the Company received a non-refundable, upfront licensing fee and shares equally with AbbVie all development costs as well as net profits or losses from the development and sale of linaclotide in the U.S. The Company receives royalties in the mid-teens percent based on net sales in Canada and Mexico. AbbVie is solely responsible for the further development, regulatory approval and commercialization of linaclotide in those countries and funding any costs. The collaboration agreement for North America also includes contingent milestone payments, as well as a contingent equity investment, based on the achievement of specific development and commercial milestones. At December 31, 2019, $205.0 million in license fees and all six development milestone payments had been received by the Company, as well as a $25.0 million equity investment in the Company’s capital stock. The Company can also achieve up to $80.0 million in a sales-related milestone if certain conditions are met, which will be recognized as collaborative arrangements revenue when it is probable that a significant reversal of revenue would not occur, and the associated constraints have been lifted.

During the years ended December 31, 2020, 2019 and 2018, the Company incurred approximately $20.1 million, approximately $37.6 million, and approximately $39.2 million in total research and development expenses under the linaclotide collaboration for North America. As a result of the research and development cost-sharing provisions of the linaclotide collaboration for North America, the Company incurred approximately $5.6 million during the year ended December 31, 2020, and offset approximately $7.2 million and approximately $9.0 million in research and development costs during the years ended December 31, 2019 and 2018, respectively, to reflect the obligations of each party under the collaboration to bear 50% of the development costs incurred.

The Company and AbbVie began commercializing LINZESS in the U.S. in December 2012. The Company receives 50% of the net profits and bears 50% of the net losses from the commercial sale of LINZESS in the U.S. Net profits or net losses consist of net sales of LINZESS to third-party customers and sublicense income in the U.S. less the cost of goods sold as well as selling, general and administrative expenses. LINZESS net sales are calculated and recorded by AbbVie and may include gross sales net of discounts, rebates, allowances, sales taxes, freight and insurance charges, and other applicable deductions.

The Company evaluated its collaboration arrangement for North America with AbbVie and concluded that all development-period performance obligations had been satisfied as of September 2012. However, the Company has determined that there are three remaining commercial-period performance obligations, which include the sales detailing of LINZESS, participation in the joint commercialization committee, and approved additional trials. The consideration remaining includes cost reimbursements in the U.S., as well as commercial sales-based milestones and net profit and loss sharing payments based on net sales in the U.S. Additionally, the Company receives royalties in the mid-teens percent based on net sales in Canada and Mexico. Royalties, commercial sales-based milestones, and net profit and loss sharing payments will be recorded as collaborative arrangements revenue or expense in the period earned, as these payments relate predominately to the license granted to AbbVie. The Company records royalty revenue in the period earned based on royalty reports from its partner, if available, or based on the projected sales and historical trends. The cost reimbursements received from AbbVie during the commercialization period will be recognized as earned in accordance with the right-to-invoice practical expedient, as the Company’s right to consideration corresponds directly with the value of the services transferred during the commercialization period.

Under the Company’s collaboration agreement with AbbVie for North America, LINZESS net sales are calculated and recorded by AbbVie and include gross sales net of discounts, rebates, allowances, sales taxes, freight and insurance charges, and other applicable deductions, as noted above. These amounts include the use of estimates and judgments, which could be adjusted based on actual results in the future. The Company records its share of the net profits or net losses from the sales of LINZESS in the U.S. on a net basis less commercial expenses, and presents the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. This treatment is in accordance with the Company’s revenue recognition policy, given that the Company is not the primary obligor and does not have the inventory risks in the collaboration agreement with AbbVie for North America. The Company relies on AbbVie to provide accurate and complete information related to net sales of LINZESS

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in accordance with U.S. generally accepted accounting principles in order to calculate its settlement payments to and from AbbVie and record collaboration expense or collaborative arrangements revenue, as applicable.

From time to time, in accordance with the terms of the collaboration with AbbVie for North America, the Company engages an independent certified public accounting firm to review the accuracy of the financial reporting from AbbVie to the Company. In connection with such a review during the three months ended September 30, 2018, AbbVie reported to the Company an approximately $59.3 million negative adjustment to LINZESS net sales. The adjustment related to the cumulative difference between certain previously estimated LINZESS gross-to-net sales reserves and allowances made by AbbVie during the years ended December 31, 2015, 2016 and 2017, and subsequent actual payments made. This adjustment was primarily associated with estimated governmental and contractual rebates, as reported by AbbVie. Upon receiving this information from AbbVie, the Company recorded a change in accounting estimate to reduce collaborative arrangements revenue by approximately $29.7 million during the three months ended September 30, 2018 related to the Company’s share of this adjustment. In addition, during the three months ended December 31, 2018, AbbVie reported to the Company a true-up of approximately $0.2 million related to the previously reported adjustment for the cumulative difference between certain previously estimated LINZESS gross-to-net sales reserves and allowances.

The Company recognized collaborative arrangements revenue from the AbbVie collaboration agreement for North America during the years ended December 31, 2020, 2019, and 2018 as follows (in thousands):

	Year Ended December 31,
	2020		2019		2018
Collaborative arrangements revenue related to sales of LINZESS in the U.S.	$	368,603	$	325,429	$	264,243
Royalty revenue		2,299		2,162		1,934
Total collaborative arrangements revenue	$	370,902	$	327,591	$	266,177

The collaborative arrangements revenue recognized in the years ended December 31, 2020, 2019, and 2018 primarily represents the Company’s share of the net profits and net losses on the sale of LINZESS in the U.S.

The following table presents the amounts recorded by the Company for commercial efforts related to LINZESS in the U.S. in the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Ironwood's collaborative arrangement revenue	$	368,603	$	325,429	$	264,243
Selling, general and administrative costs incurred by the Company(1)		(39,312)		(38,123)		(42,435)
Ironwood's share of net profits(2)	$	329,291	$	287,306	$	221,808

(1) Includes Ironwood’s selling, general and administrative expenses attributable to the cost-sharing arrangement with AbbVie. Excludes approximately $0.6 million, approximately $2.4 million, and approximately $2.2 million for the years ended December 31, 2020, 2019, and 2018 respectively, related to patent prosecution and patent litigation costs recognized in connection with the collaboration agreement with AbbVie.

(2) Ironwood has recalculated its share of net profit on sales of LINZESS in the U.S. to conform with AbbVie’s recast of historically reported LINZESS U.S. net sales (previously reported by Allergan).

In May 2014, CONSTELLA^® became commercially available in Canada and, in June 2014, LINZESS became commercially available in Mexico. The Company records royalties on sales of CONSTELLA in Canada and LINZESS in Mexico in the period earned. The Company recognized approximately $2.3 million, approximately $2.2 million, and approximately $1.9 million of combined royalty revenues from Canada and Mexico during the years ended December 31, 2020, 2019, and 2018, respectively.

License Agreement with AbbVie (All countries other than the countries and territories of North America, China (including Hong Kong and Macau), and Japan)

In April 2009, the Company entered into a license agreement with Almirall, S.A. (“Almirall”) to develop and commercialize linaclotide in Europe (including the Commonwealth of Independent States and Turkey) for the treatment

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of IBS-C, CIC and other GI conditions (the “European License Agreement”). In accordance with the European License Agreement, the Company granted Almirall a right to access its U.S. Phase III clinical trial data for the purposes of supporting European regulatory approval. In October 2015, Almirall transferred its exclusive license to develop and commercialize linaclotide in Europe to AbbVie.

Additionally, in October 2015, the Company and AbbVie separately entered into an amendment to the European License Agreement relating to the development and commercialization of linaclotide in Europe. Pursuant to the terms of the amendment, (i) certain sales-based milestones payable to the Company under the European License Agreement were modified to increase the total milestone payments such that, when aggregated with certain commercial launch milestones, they could total up to $42.5 million, (ii) the royalties payable to the Company during the term of the European License Agreement were modified such that the royalties based on sales volume in Europe begin in the mid-single digit percent and escalate to the upper-teens percent by calendar year 2019, and (iii) AbbVie assumed responsibility for the manufacturing of linaclotide API for Europe from the Company, as well as the associated costs. The Company concluded that the 2015 amendment to the European License Agreement was not a modification to the linaclotide collaboration agreement with AbbVie for North America.

In January 2017, the Company and AbbVie entered into an amendment to the European License Agreement (the “2017 Amendment”). The 2017 Amendment extended the license to develop and commercialize linaclotide in all countries other than China (including Hong Kong and Macau), Japan, and the countries and territories of North America. On a country-by-country and product-by-product basis in such additional territory, AbbVie is obligated to pay the Company a royalty as a percentage of net sales of products containing linaclotide as an active ingredient in the upper-single digits for five years following the first commercial sale of a linaclotide product in a country, and in the low-double digits thereafter. The royalty rate for products in the expanded territory will decrease, on a country-by-country basis, to the lower-single digits, or cease entirely, following the occurrence of certain events. The 2017 Amendment did not modify any of the milestones or royalty terms related to Europe.

In evaluating the terms of the European License Agreement, as amended, the Company determined that there are no remaining performance obligations as of September 2012. However, the Company continues to be eligible to receive consideration in the form of commercial launch milestones, sales-based milestones, and royalties.

The commercial launch milestones, sales-based milestones and royalties under the European License Agreement and the 2017 Amendment relate predominantly to the license granted to AbbVie. The Company records royalties on sales of CONSTELLA in Europe in the period earned based on royalty reports from its partner, if available, or the projected sales and historical trends under the sales-based royalty exception. The commercial launch milestones are recognized as revenue when it is probable that a significant reversal of revenue would not occur and the associated constraint has been lifted.

The Company recognized approximately $2.2 million, approximately $1.7 million and approximately $1.1 million of royalty revenue from the Amended European License Agreement during the years ended December 31, 2020, 2019, and 2018, respectively.

License Agreement for Japan with Astellas

In November 2009, the Company entered into a license agreement with Astellas, as amended, to develop and commercialize linaclotide for the treatment of IBS-C, CIC and other GI conditions in Japan (the “2009 License Agreement with Astellas”). Astellas is responsible for all activities relating to development, regulatory approval and commercialization in Japan as well as funding the associated costs and the Company was required to participate on a joint development committee over linaclotide’s development period. During the year ended December 31, 2017, the Company and Astellas entered into a commercial API supply agreement (the “Astellas Commercial Supply Agreement”). Pursuant to the Astellas Commercial Supply Agreement, the Company sells linaclotide API supply to Astellas at a contractually defined rate and recognizes related revenue as sale of API. Under the 2009 License Agreement with Astellas, the Company received royalties which escalated based on sales volume, beginning in the low-twenties percent, less the transfer price paid for the API included in the product sold and other contractual deductions.

Under the 2009 License Agreement with Astellas, the Company received an up-front licensing fee of $30.0 million and three development milestone payments that totaled $45.0 million, which were recognized as revenue prior to the adoption of ASC 606 on January 1, 2018.

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The Company evaluated the terms of the 2009 License Agreement with Astellas and determined that there were no remaining performance obligations as of the adoption of ASC 606. Additionally, under the terms of the Astellas Commercial Supply Agreement, the Company determined it had an ongoing performance obligation to supply API.

During the years ended December 31, 2019 and 2018, the Company recognized revenue of approximately $27.5 million and approximately $69.6 million, respectively, from the sale of API to Astellas under the 2009 License Agreement with Astellas and the Astellas Commercial Supply Agreement. The royalties on sales of LINZESS in Japan did not exceed the transfer price of API sold and other contractual deductions during each of the periods presented.

In August 2019, the Company and Astellas amended and restated the 2009 License Agreement with Astellas (the “Amended Astellas License Agreement”). This amendment to the 2009 License Agreement with Astellas was accounted for as a separate contract. Under the terms of the Amended Astellas License Agreement, the Company is no longer responsible for the supply of linaclotide API to Astellas, and Astellas assumed responsibility for its own supply of linaclotide API in Japan in 2020.

In connection with the execution of the Amended Astellas License Agreement, Astellas paid the Company a non-refundable, upfront payment of $10.0 million in August 2019. Further, Astellas, in lieu of the royalty payment terms set forth in the 2009 License Agreement with Astellas, pays royalties to the Company at rates beginning in the mid-single digit percent and escalating to low-double-digit percent, based on aggregate annual net sales in Japan of products containing linaclotide API. These royalty payments are subject to reduction following the expiration of certain licensed patents and the occurrence of generic competition in Japan. The Company continued to supply linaclotide API for Japan during 2019 and 2020 at a contractually defined rate. Additionally, Astellas reimbursed the Company for the Company’s performance of adverse event reporting services at a fixed monthly rate until such services were terminated in February 2020.

The Company identified the following performance obligations under the Amended Astellas License Agreement:

● delivery of the expanded license of intellectual property, including the applicable manufacturing know-how;

● obligation to supply linaclotide API for 2019; and

● adverse event reporting services.

The Company allocated the $10.0 million upfront payment to the delivery of the expanded license of intellectual property and recognized it as collaborative arrangements revenue at contract inception. The Company allocated the approximately $20.4 million in remaining purchase orders for API to the obligation to supply linaclotide API to Astellas for 2019. Consideration for the supply of linaclotide API is recognized over the performance period as linaclotide API is shipped to Astellas. Consideration allocated to the adverse event reporting services is recognized as such services are provided over the performance period based on the amount to which the Company has a right to invoice.

Royalties on sales of LINZESS in Japan relate predominantly to the license granted to Astellas. Accordingly, the Company applies the sales-based royalty exception and records royalties on sales of LINZESS in Japan in the period earned based on royalty reports from its partner, if available, or the projected sales and historical trends.

The Company recognized $10.0 million in collaborative arrangements revenue during the year ended December 31, 2019 related to the upfront fee associated with the execution of the Amended Astellas License Agreement. The Company recognized approximately $2.0 million and approximately $18.3 million from the sale of API to Astellas under the Amended License Agreement during the years ended December 31, 2020 and 2019, respectively. The Company recognized approximately $2.1 million of royalty revenue during the year ended December 31, 2020. The Company recognized an insignificant amount of collaborative arrangements revenue related to adverse event reporting services in each of the years ended December 31, 2020 and 2019.

Collaboration Agreement for China (including Hong Kong and Macau) with AstraZeneca

In October 2012, the Company entered into a collaboration agreement with AstraZeneca to co-develop and co-commercialize linaclotide in the AstraZeneca License Territory (the “AstraZeneca Collaboration Agreement”). The

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collaboration provided AstraZeneca with an exclusive nontransferable license to exploit the underlying technology in the AstraZeneca License Territory. The parties shared responsibility for continued development and commercialization of linaclotide under a joint development plan and a joint commercialization plan, respectively, with AstraZeneca having primary responsibility for the local operational execution.

In September 2019, the Company and AstraZeneca entered into an amendment and restatement of the AstraZeneca Collaboration Agreement (the “Amended AstraZeneca Agreement”) under which AstraZeneca obtained the exclusive right to develop, manufacture and commercialize products containing linaclotide in the AstraZeneca License Territory (the “AstraZeneca License”).

Prior to the execution of the Amended AstraZeneca Agreement, the Company identified the following performance obligations under the AstraZeneca Collaboration Agreement:

● research, development and regulatory services pursuant to the development plan (“R&D Services”);

● Joint Development Committee (“JDC”) services;

● obligation to supply clinical trial material; and

● Joint Commercialization Committee services.

Under the original AstraZeneca Collaboration Agreement, the Company shared development costs with AstraZeneca, with AstraZeneca incurring 55% of the net losses from the development and commercialization of linaclotide in the AstraZeneca License Territory. Payments from AstraZeneca with respect to both research and development and selling, general and administrative costs incurred by the Company prior to the commercialization of linaclotide in the AstraZeneca License Territory were recorded as a reduction in expense. Development costs incurred by the Company that pertained to the joint development plan and subsequent amendments to the joint development plan, as approved by the JDC, were recorded as research and development expense as incurred. Payments to AstraZeneca were recorded as incremental research and development expense. During the years ended December 31, 2019 and 2018, the Company incurred approximately $1.2 million and approximately $0.9 million, respectively, related to pre-launch commercial services and supply chain services.

Under the Amended AstraZeneca Agreement, the Company is entitled to receive non-contingent payments totaling $35.0 million in three installments through 2024, of which $10.0 million was received in January 2021. In addition, AstraZeneca may be required to make milestone payments totaling up to $90.0 million contingent on the achievement of certain sales targets and will be required to pay tiered royalties to the Company at rates beginning in the mid-single-digit percent and increasing up to twenty percent based on the aggregate annual net sales of products containing linaclotide in the AstraZeneca License Territory. In connection with the Amended AstraZeneca Agreement, the Company and AstraZeneca entered into a transition services agreement (“AstraZeneca TSA”) and an amended commercial supply agreement (“AstraZeneca CSA”). Under the terms of the AstraZeneca TSA, the Company will provide certain regulatory and administrative services for a term of approximately two years from the date of execution, unless earlier terminated or extended. Services performed are paid at a mutually agreed upon rate. Amounts for AstraZeneca TSA services are recorded as collaborative arrangements revenue. Under the terms of the AstraZeneca CSA, the Company supplied linaclotide API, finished drug product and finished goods for the Licensed Territory through March 31, 2020 at predetermined rates.

The Company evaluated the Amended AstraZeneca Agreement and determined that it would be accounted for as a separate contract because it adds a distinct good or service at an amount that reflects standalone selling price. The following performance obligations under the Amended AstraZeneca Agreement were identified:

● delivery of the expanded AstraZeneca License;

● AstraZeneca TSA services; and

● supply of linaclotide API, finished drug product and finished goods under the AstraZeneca CSA.

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The Company determined that the non-contingent payments should be allocated to the delivery of the expanded AstraZeneca License. The Company determined that the performance obligation related to the transfer of the AstraZeneca License was satisfied as of the execution date of the Amended AstraZeneca Agreement. As a portion of the payments relating to the transfer of the AstraZeneca License are due significantly after the performance obligation was satisfied, the Company adjusted its transaction price for the significant financing component of approximately $2.6 million. Accordingly, the Company recognized approximately $32.4 million relating to the delivery of the AstraZeneca License as collaborative arrangements revenue at contract inception and will recognize the approximately $2.6 million relating to the significant financing component as interest income through 2024 using the effective interest method. Consideration allocated to the AstraZeneca TSA services will be recognized as collaborative arrangements revenue as such services are provided over the performance period based on the amount to which the Company has a right to invoice. Consideration for the supply of linaclotide API, finished drug product and finished goods under the AstraZeneca CSA was recognized over the performance period as linaclotide API, finished drug product and finished goods were shipped to AstraZeneca.

During the year ended December 31, 2020, the Company recognized approximately $0.7 million in collaborative arrangements revenue related to the Amended AstraZeneca License, of which approximately $0.6 million related to the AstraZeneca TSA services and approximately $0.1 million related to royalties. During the year ended December 31, 2020, the Company recognized approximately $5.5 million of sale of API on its consolidated statement of operations relating to the supply of linaclotide finished drug product and finished goods under the AstraZeneca CSA. During the year ended December 31, 2019, the Company recognized approximately $32.6 million in collaborative arrangements revenue related to the Amended AstraZeneca License, of which approximately $32.4 million related to the delivery of the AstraZeneca License and approximately $0.2 million related to the AstraZeneca TSA services. During the year ended December 31, 2019, the Company recognized approximately $3.0 million of sale of API on its consolidated statement of operations relating to the supply of linaclotide finished drug product and finished goods under the AstraZeneca CSA.

Co-Promotion and Other Agreements

Disease Education and Promotional Agreement with Alnylam

In August 2019, the Company and Alnylam entered into a disease education and promotional agreement for Alnylam’s GIVLAARI, and this agreement was subsequently amended in December 2020 (the “Alnylam Agreement”). GIVLAARI was approved by the U.S. FDA in November 2019 for the treatment of adult patients with AHP. Under the terms of the Alnylam Agreement, the Company’s sales force is performing disease awareness activities and sales detailing activities for GIVLAARI to gastroenterologists and health care practitioners to whom they detail LINZESS in the first position over the term of the agreement, which is approximately three years.

Under the Alnylam Agreement, the Company received service fees, totaling approximately $5.5 million for services rendered through December 31, 2020. The Company also is eligible to receive royalties based on a percentage of net sales of GIVLAARI that are directly attributable to the Company’s promotional efforts over the term of the agreement. The Company identified the following performance obligation under the Alnylam Agreement:

● performance of disease education activities for AHP and performance of sales details for GIVLAARI (together “Givosiran Education and Promotion Activities”).

The Company allocated the service fees to the performance of Givosiran Education and Promotion Activities and recognized collaborative arrangements revenue through December 31, 2020 as the services were performed based on the amount to which the Company had a right to invoice. Royalties are recognized as collaborative arrangements revenue for Givosiran Education and Promotion Activities based on the amount to which the Company has a right to invoice when the associated constraints have been lifted.

During the years ended December 31, 2020 and 2019, the Company recognized approximately $3.5 million and approximately $2.0 million, respectively, in collaborative arrangements revenue related to the service fees. During the year ended December 31, 2020, the Company recognized approximately $0.8 million in royalty revenue related to the Alnylam Agreement. The Company did not recognize any royalty revenue related to the Alnylam Agreement during the year ended December 31, 2019. As of December 31, 2019, the Company had a deferred revenue balance of

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approximately $0.9 million related to advance billings of service fees. As of December 31, 2020, the Company had no deferred revenue.

7. Fair Value of Financial Instruments

The tables below present information about the Company’s assets that are measured at fair value on a recurring basis as of December 31, 2020 and 2019 and indicate the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value. In general, fair values determined by Level 1 inputs utilize observable inputs such as quoted prices in active markets for identical assets or liabilities. Fair values determined by Level 2 inputs utilize data points that are either directly or indirectly observable, such as quoted prices for similar instruments in active markets, interest rates and yield curves. Fair values determined by Level 3 inputs utilize unobservable data points in which there is little or no market data, which require the Company to develop its own assumptions for the asset or liability.

The Company’s investment portfolio may include fixed income securities that do not always trade on a daily basis. As a result, the pricing services used by the Company apply other available information as applicable through processes such as benchmark yields, benchmarking of like securities, sector groupings and matrix pricing to prepare valuations. In addition, model processes are used to assess interest rate impact and develop prepayment scenarios. These models take into consideration relevant credit information, perceived market movements, sector news and economic events. The inputs into these models may include benchmark yields, reported trades, broker-dealer quotes, issuer spreads and other relevant data. The Company validates the prices provided by its third party pricing services by obtaining market values from other pricing sources and analyzing pricing data in certain instances. The Company also invests in certain reverse repurchase agreements, which are collateralized by Government Securities and Obligations for an amount not less than 102% of their principal amount. The Company does not record an asset or liability for the collateral as the Company is not permitted to sell or re-pledge the collateral. The collateral has at least the prevailing credit rating of U.S. Government Treasuries and Agencies. The Company utilizes a third party custodian to manage the exchange of funds and ensure the collateral received is maintained at 102% of the reverse repurchase agreements principal amount on a daily basis.

The following tables present the assets and liabilities the Company has measured at fair value on a recurring basis (in thousands):

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents:
Money market funds	$	349,014	$	349,014	$	—	$	—
Restricted cash:
Money market funds		2,221		2,221		—		—
Convertible note hedges		13,065		—		—		13,065
Total assets measured at fair value	$	364,300	$	351,235	$	—	$	13,065
Liabilities:
Note hedge warrants	$	12,088	$	—	$	—	$	12,088
Total liabilities measured at fair value	$	12,088	$	—	$	—	$	12,088

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			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2019		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents:
Money market funds	$	139,190	$	139,190	$	—	$	—
Repurchase agreements		37,800		37,800		—		—
Restricted cash:
Money market funds		2,221		2,221		—		—
Convertible note hedges		31,366		—		—		31,366
Total assets measured at fair value	$	210,577	$	179,211	$	—	$	31,366
Liabilities:
Note hedge warrants	$	24,260	$	—	$	—	$	24,260
Total liabilities measured at fair value	$	24,260	$	—	$	—	$	24,260

There were no transfers between fair value measurement levels during each of the years ended December 31, 2020 or 2019.

Cash equivalents, accounts receivable, related party accounts receivable, prepaid expenses and other current assets, accounts payable, related party accounts payable, accrued research and development costs, accrued expenses and other current liabilities, current portion of operating lease obligations, and deferred revenue at December 31, 2020 and 2019 are carried at amounts that approximate fair value due to their short-term maturities.

Convertible Note Hedges and Note Hedge Warrants with Respect to 2022 Convertible Notes

The Company’s Convertible Note Hedges and the Note Hedge Warrants are recorded as derivative assets and liabilities, respectively, and are classified as Level 3 measurements under the fair value hierarchy. These derivatives are not actively traded and are valued using the Black-Scholes option-pricing model, which requires the use of subjective assumptions. Significant inputs used to determine the fair value as of December 31, 2020 included the price per share of the Company’s Class A Common Stock, expected terms of the derivative instruments, strike prices of the derivative instruments, risk-free interest rates, and expected volatility of the Company’s Class A Common Stock. Changes to these inputs could materially affect the valuation of the Convertible Note Hedges and Note Hedge Warrants.

The following inputs were used in the fair market valuation of the Convertible Note Hedges and Note Hedge Warrants as of December 31, 2020 and 2019:

	December 31,						December 31,
	2020						2019
	Convertible			Note Hedge			Convertible			Note Hedge
	Note Hedges			Warrants			Note Hedges			Warrants
Risk-free interest rate (1)		0.1	%		0.1	%		1.6	%		1.6	%
Expected term		1.5			2.0			2.5			3.0
Stock price (2)	$	11.39		$	11.39		$	13.31		$	13.31
Strike price (3)	$	14.51		$	18.82		$	14.51		$	18.82
Common stock volatility (4)		46.7	%		50.3	%		49.1	%		46.5	%
Dividend yield (5)		—	%		—	%		—	%		—	%

(1) Based on U.S. Treasury yield curve, with terms commensurate with the expected terms of the Convertible Note Hedges and the Note Hedge Warrants.

(2) The closing price of the Company’s Class A Common Stock on the last trading days of the years ended December 31, 2020 and 2019, respectively.

(3) As per the respective agreements for the Convertible Note Hedges and Note Hedge Warrants.

(4) Expected volatility based on historical volatility of the Company’s Class A Common Stock.

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(5) The Company has not paid and does not anticipate paying cash dividends on its shares of common stock in the foreseeable future; therefore, the expected dividend yield is assumed to be zero.

The Convertible Note Hedges and the Note Hedge Warrants are recorded at fair value at each reporting date and changes in fair value are recorded in other (expense) income, net within the Company's consolidated statements of operations.

The following table reflects the change in the Company's Level 3 Convertible Note Hedges and Note Hedge Warrants from December 31, 2018 through December 31, 2020 (in thousands):

	Convertible		Note Hedge
	Note Hedges		Warrants
Balance at December 31, 2018	$	41,020	$	(33,763)
Cash settlement (received) paid upon early termination of derivatives (Note 11)		(28,909)		25,735
Change in fair value, recorded as a component of gain (loss) on derivatives		19,255		(16,232)
Balance at December 31, 2019	$	31,366	$	(24,260)
Change in fair value, recorded as a component of (loss) gain on derivatives		(18,301)		12,172
Balance at December 31, 2020	$	13,065	$	(12,088)

Convertible Senior Notes

In June 2015, the Company issued approximately $335.7 million aggregate principal amount of its 2022 Convertible Notes. In August 2019, the Company issued $200.0 million aggregate principal amount of its 2024 Convertible Notes and $200.0 million aggregate principal amount of its 2026 Convertible Notes, and used a portion of the proceeds from such issuances to repurchase $215.0 million aggregate principal amount of its 2022 Convertible Notes. The Company separately accounted for the liability and equity components of each of the 2022 Convertible Notes, 2024 Convertible Notes, and 2026 Convertible Notes, by allocating the proceeds between the liability component and equity component (Note 11). The fair value of the respective convertible senior notes, which differs from their carrying value, is influenced by interest rates, the price of the Company’s Class A Common Stock and the volatility thereof, and the prices for the respective convertible senior notes observed in market trading, which are Level 2 inputs.

The estimated fair value of the 2022 Convertible Notes as of December 31, 2020 and 2019 was approximately $130.2 million and $141.3 million, respectively. The estimated fair value of the 2024 Convertible Notes as of December 31, 2020 and 2019 was approximately $222.3 million and $235.7 million, respectively. The estimated fair value of the 2026 Convertible Notes as of December 31, 2020 and 2019 was approximately $224.1 million and $240.1 million, respectively.

Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes

In connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into the Capped Calls with certain financial institutions. The Capped Calls cover 29,867,480 shares of Class A Common Stock (subject to anti-dilution and certain other adjustments), which is the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes. The Capped Calls have an initial strike price of approximately $13.39 per share, which corresponds to the initial conversion price of the 2024 Convertible Notes and the 2026 Convertible Notes, and have a cap price of approximately $17.05 per share (Note 11). The strike price and cap price are subject to anti-dilution adjustments generally similar to those applicable to the 2024 Convertible Notes and the 2026 Convertible Notes. These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met (Note 11).

8. Leases

Effective January 1, 2019, the Company adopted ASC 842 using the optional transition method. The Company’s lease portfolio for the year ended December 31, 2020 includes: a lease for its current headquarters location, a data center colocation lease, vehicle leases for its salesforce representatives, and leases for computer and office equipment.

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Lease cost is recognized on a straight-line basis over the lease term. The components of lease cost for the year ended December 31, 2020 and 2019 are as follows (in thousands):

	Year Ended December 31,
	2020		2019
Operating lease cost during period, net(1)	$	2,530	$	16,452
Variable lease payments		—		1,526
Short-term lease cost		1,420		1,512
Total lease cost	$	3,950	$	19,490

(1) Operating lease cost is presented net of approximately $0.3 million of sublease income for the year ended December 31, 2019 related to a sublease agreement between Ironwood and Cyclerion executed upon Separation. The sublease agreement terminated in May 2019.

Supplemental cash flow information related to leases for the periods reported is as follows:

	Year Ended December 31,
	2020			2019
Right-of-use assets obtained in exchange for new operating lease upon adoption of ASC 842 (in thousands)	$	—		$	88,299
Adjustment to right-of-use assets as a result of the lease modification upon Separation (in thousands)		—			(40,427)
Adjustment to right-of-use assets as a result of the termination of the Binney Street Lease (in thousands)		—			(34,440)
Right-of-use assets obtained in exchange for new operating lease liabilities upon execution of Summer Street Lease (in thousands)		—			18,452
Cash paid for amounts included in the measurement of lease liabilities (in thousands)		1,146			18,598
Weighted-average remaining lease term of operating leases (in years)		9.3			10.2
Weighted-average discount rate of operating leases		5.8	%		5.8	%

Future minimum lease payments under non-cancelable operating leases as of December 31, 2020 are as follows (in thousands):

	Operating
	Lease
	Payments
2021	$	3,128
2022		3,129
2023		3,065
2024		3,126
2025		3,189
2026 and thereafter		14,856
Total future minimum lease payments		30,493
Less: present value adjustment		(7,047)
Operating lease liabilities at December 31, 2020		23,446
Less: current portion of operating lease liabilities		(3,128)
Operating lease liabilities, net of current portion	$	20,318

Summer Street Lease (current headquarters)

In June 2019, the Company entered into a non-cancelable operating lease (the “Summer Street Lease”) for approximately 39,000 square feet of office space on the 23^rd floor of 100 Summer Street, Boston, Massachusetts, which began serving as the Company’s headquarters in October 2019, replacing its prior headquarters at 301 Binney Street in Cambridge, Massachusetts. The Summer Street Lease terminates on June 11, 2030 and includes a 2% annual rent escalation, free rent periods, a tenant improvement allowance, and an option to extend the term of the lease for an

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additional five years at a market base rental rate. The rent expense, inclusive of the escalating rent payments and lease incentives, is recognized on a straight-line basis over the lease term. Additionally, the Summer Street Lease requires a letter of credit to secure the Company’s obligations under the lease agreement of approximately $1.0 million, which is collateralized by a money market account recorded as restricted cash on the Company’s consolidated balance sheet as of December 31, 2020.

At lease inception, the Company recorded a right-of-use asset and a lease liability associated with the Summer Street Lease using an incremental borrowing rate of approximately 5.8%. At December 31, 2020, the balances of the right-of-use asset and operating lease liability were approximately $16.6 million and approximately $23.2 million, respectively. At December 31, 2019, the balances of the right-of-use asset and operating lease liability were approximately $17.7 million and approximately $22.8 million, respectively.

Lease costs related to the Summer Street Lease recorded during the years ended December 31, 2020 and 2019 were approximately $2.5 million and approximately $1.5 million, respectively.

Binney Street Lease (prior headquarters)

The Company rented office space at 301 Binney Street, Cambridge, Massachusetts under a non-cancelable operating lease entered into in January 2007, as amended (“Binney Street Lease”) through October 2019.

On April 1, 2019, the Company modified the Binney Street Lease to reduce its leased premises to approximately 108,000 rentable square feet of office space on the first and third floors. The surrendered portion of approximately 114,000 rentable square feet on the first and second floor of the building was subsequently occupied by Cyclerion under a direct lease between Cyclerion and the Binney Street landlord. As a result of the modification, the Company adjusted the value of its right-of-use asset and operating lease liability using an incremental borrowing rate of approximately 5.1%, and recognized a gain of approximately $3.2 million, which was recorded as a reduction to operating expenses on its consolidated statement of operations. The Company elected to determine the proportionate reduction in the right-of-use asset based on the reduction to the lease liability.

As of January 1, 2019, in conjunction with the adoption of ASC 842, the Company recorded a right-of-use asset of approximately $87.7 million and a lease liability of approximately $94.3 million associated with the Binney Street Lease.

On June 11, 2019, the Company entered into a lease termination agreement (the “Lease Termination”) with the Binney Street landlord to terminate the Company’s lease for approximately 108,000 square feet of office space. The Lease Termination was effective during the fourth quarter of 2019 in exchange for an approximately $9.0 million payment. The Lease Termination was accounted for as a lease modification that reduces the term of the existing lease and the Company adjusted the value of its right-of-use asset and operating lease liability using an incremental borrowing rate of approximately 4.0%.

Lease cost related to the Binney Street Lease recorded during the year ended December 31, 2019 was approximately $16.3 million, net of sublease income of approximately $0.3 million. Under ASC 840, rent expense related to the Binney Street Lease recorded during the year ended December 31, 2018 was approximately $10.0 million.

Vehicle fleet leases

During April 2018, the Company entered into a master services agreement containing 12-month leases (the “2018 Vehicle Leases”) for vehicles within its fleet for its field-based sales force and medical science liaisons. These leases are classified as short-term in accordance with the practical expedient in ASC 842. The 2018 Vehicle Leases expire at varying times, with a monthly renewal provision. In accordance with the terms of the 2018 Vehicle Leases, the Company maintains a letter of credit securing its obligation under the lease agreements of $1.3 million, which is collateralized by a money market account recorded as restricted cash on the Company’s consolidated balance sheets as of December 31, 2020 and 2019.

Lease cost related to the 2018 Vehicle Leases was approximately $1.4 million and approximately $1.5 million, respectively, for the years ended December 31, 2020 and 2019. Under ASC 840, lease cost related to the 2018 Vehicle Leases was approximately $0.8 million for the year ended December 31, 2018.

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9. Property and Equipment

Property and equipment, net consisted of the following (in thousands):

	December 31,
	2020		2019
Software	$	8,615	$	9,568
Leasehold improvements		7,407		7,318
Laboratory equipment		1,898		2,193
Furniture and fixtures		1,517		1,508
Computer and office equipment		1,297		1,293
Construction in process		—		631
		20,734		22,511
Less accumulated depreciation and amortization		(11,805)		(10,082)
	$	8,929	$	12,429

Depreciation expense of property and equipment was approximately $2.3 million and $5.6 million for the years ended December 31, 2020 and 2019, respectively. Depreciation and amortization expense of property and equipment, including amounts recorded under capital leases under ASC 840, was approximately $3.9 million for the year ended December 31, 2018.

During the year ended December 31, 2020, the Company recorded approximately $1.2 million in restructuring expenses in its consolidated statement of operations related to the impairment of certain fixed assets as a result of its decision to discontinue IW-3718 development.

10. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31,
	2020		2019
Accrued incentive compensation	$	8,719	$	11,760
Accrued vacation		2,625		2,540
Professional fees		530		1,421
Salaries		627		2,973
Other employee benefits		1,442		1,260
Restructuring liabilities		10,510		179
Other		2,033		10,332
	$	26,486	$	30,465

As of December 31, 2020, other accrued expenses of approximately $2.0 million included approximately $1.6 million of uninvoiced vendor liabilities and approximately $0.3 million of accrued interest.

As of December 31, 2019, other accrued expenses of approximately $10.3 million included approximately $4.1 million related to API batches uninvoiced, approximately $0.9 million related to activities associated with the Company’s move to the 100 Summer Street headquarters, approximately $0.6 million related to unbilled inventory, approximately $0.3 million of accrued interest, and approximately $0.2 million related to equipment for clinical studies.

11. Notes Payable

8.375% Notes due 2026

On September 23, 2016, the Company closed a direct private placement, pursuant to which the Company issued $150.0 million in aggregate principal amount of 8.375% Notes due 2026 (the “2026 Notes”) and received net proceeds of approximately $11.2 million. The Company capitalized approximately $0.5 million of debt issuance costs, which were netted against the carrying value of the 2026 Notes. Proceeds from the issuance of the 2024 Convertible Notes and the

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2026 Convertible Notes were used, in part, to redeem the outstanding principal balance of the 2026 Notes in September 2019. The Company retired the 2026 Notes, which had an outstanding aggregate principal balance of approximately $116.5 million, for a redemption price of approximately $123.0 million. The redemption of the 2026 Notes resulted in a loss on extinguishment of debt of approximately $7.6 million related to the prepayment premium and write-off of the unamortized debt issuance costs and unamortized debt discount.

The 2026 Notes had an annual interest rate of 8.375%, with interest payable March 15, June 15, September 15 and December 15 of each year (each an “8.375% Payment Date”). Principal of the 2026 Notes was payable on the 8.375% Payment Dates beginning March 15, 2019. From March 15, 2019, the Company made quarterly payments on the 2026 Notes equal to the greater of (i) 7.5% of net sales of linaclotide in the U.S. for the preceding quarter (the “8.375% Synthetic Royalty Amount”) and (ii) accrued and unpaid interest on the 2026 Notes (the “8.375% Required Interest Amount”). Principal on the 2026 Notes was due to be repaid in an amount equal to the 8.375% Synthetic Royalty Amount minus the 8.375% Required Interest Amount, when this was a positive number, until the principal had been paid in full.

Convertible Senior Notes

2.25% Convertible Senior Notes due 2022

In June 2015, the Company issued approximately $335.7 million aggregate principal amount of the 2022 Convertible Notes. The Company received net proceeds of approximately $324.0 million from the sale of the 2022 Convertible Notes, after deducting fees and expenses of approximately $11.7 million. The Company used approximately $21.1 million of the net proceeds from the sale of the 2022 Convertible Notes to pay the net cost of the Convertible Note Hedges (after such cost was partially offset by the proceeds to the Company from the sale of the Note Hedge Warrants), as described below.

The 2022 Convertible Notes are governed by an indenture (the “2022 Indenture”) between the Company and U.S. Bank National Association, as trustee (the “Trustee”). The 2022 Convertible Notes are senior unsecured obligations and bear cash interest at the annual rate of 2.25%, payable on June 15 and December 15 of each year. The 2022 Convertible Notes will mature on June 15, 2022, unless earlier converted or repurchased. The Company may settle conversions of the 2022 Convertible Notes through payment or delivery, as the case may be, of cash, shares of the Company’s Class A Common Stock or a combination of cash and shares of Class A Common Stock, at the Company’s option (subject to, and in accordance with, the settlement provisions of the 2022 Indenture). The initial conversion rate for the 2022 Convertible Notes was 60.3209 shares of Class A Common Stock (subject to adjustment as provided for in the 2022 Indenture) per $1,000 principal amount of the 2022 Convertible Notes, which was equal to an initial conversion price of approximately $16.58 per share and 20,249,665 shares.

In connection with the Separation, in April 2019, the conversion rate under the 2022 Indenture was adjusted to equal 68.9172 shares of Class A Common Stock per $1,000 principal amount of the 2022 Convertible Notes, which is equal to an adjusted conversion price of approximately $14.51 per share and 23,135,435 shares.

Holders of the 2022 Convertible Notes may convert their 2022 Convertible Notes at their option at any time prior to the close of business on the business day immediately preceding December 15, 2021 in multiples of $1,000 principal amount, only under the following circumstances:

● during any calendar quarter commencing after the calendar quarter ending on September 30, 2015 (and only during such calendar quarter), if the last reported sale price of the Company’s Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the 2022 Convertible Notes on each applicable trading day;

● during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the 2022 Indenture) per $1,000 principal amount of the 2022 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s Class A Common Stock and the conversion rate for the 2022 Convertible Notes on each such trading day; or

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● upon the occurrence of specified corporate events described in the 2022 Indenture.

On or after December 15, 2021, until the close of business on the second scheduled trading day immediately preceding June 15, 2022, holders may convert their 2022 Convertible Notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.

The Company may not redeem the 2022 Convertible Notes prior to the maturity date and no “sinking fund” is provided for by the 2022 Convertible Notes, which means that the Company is not required to periodically redeem or retire the 2022 Convertible Notes. Upon the occurrence of certain fundamental changes involving the Company, holders of the 2022 Convertible Notes may require the Company to repurchase for cash all or part of their 2022 Convertible Notes at a repurchase price equal to 100% of the principal amount of the 2022 Convertible Notes to be repurchased, plus accrued and unpaid interest. If a make-whole fundamental change, as described in the 2022 Indenture, occurs and a holder elects to convert its 2022 Convertible Notes in connection with such make-whole fundamental change, such holder may be entitled to an increase in the conversion rate as described in the 2022 Indenture.

The 2022 Indenture does not contain any financial covenants or restrict the Company’s ability to repurchase the Company’s securities, pay dividends or make restricted payments in the event of a transaction that substantially increases the Company’s level of indebtedness. The 2022 Indenture provides for customary events of default. In the case of an event of default with respect to the 2022 Convertible Notes arising from specified events of bankruptcy or insolvency, all outstanding 2022 Convertible Notes will become due and payable immediately without further action or notice. If any other event of default with respect to the 2022 Convertible Notes under the 2022 Indenture occurs or is continuing, the Trustee or holders of at least 25% in aggregate principal amount of the then outstanding 2022 Convertible Notes may declare the principal amount of the 2022 Convertible Notes to be immediately due and payable. Notwithstanding the foregoing, the 2022 Indenture provides that, upon the Company’s election, and for up to 180 days, the sole remedy for an event of default relating to certain failures by the Company to comply with certain reporting covenants in the 2022 Indenture consists exclusively of the right to receive additional interest on the 2022 Convertible Notes.

In accordance with accounting guidance for debt with conversion and other options, the Company separately accounted for the liability and equity components of the 2022 Convertible Notes by allocating the proceeds between the liability component and the embedded conversion option, or equity component, due to the Company's ability to settle the 2022 Convertible Notes in cash, its Class A Common Stock, or a combination of cash and Class A Common Stock at the option of the Company. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated conversion feature. The equity component of the 2022 Convertible Notes was recognized as a debt discount and represents the difference between the gross proceeds from the issuance of the 2022 Convertible Notes and the fair value of the liability component of the 2022 Convertible Notes on their respective dates of issuance. The debt discount is amortized to interest expense using the effective interest method over seven years, or the expected life of the 2022 Convertible Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

In connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes in August 2019, the Company repurchased $215.0 million aggregate principal amount of the 2022 Convertible Notes. The 2022 Convertible Notes were repurchased at a premium totaling approximately $227.3 million. The Company recognized a loss on extinguishment of debt of approximately $23.4 million during the year ended December 31, 2019 related to the prepayment premium and proportional write-off of the 2022 Convertible Notes unamortized debt issuance costs and unamortized debt discount. Additionally, the repurchase resulted in a reduction to additional paid-in capital of approximately $27.0 million during the year ended December 31, 2019 related to the equity component of the 2022 Convertible Notes.

0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026

In August 2019, the Company issued $200.0 million aggregate principal amount of the 2024 Convertible Notes and $200.0 million aggregate principal amount of the 2026 Convertible Notes. The Company received net proceeds of approximately $391.0 million from the sale of the 2024 Convertible Notes and 2026 Convertible Notes, after deducting fees and expenses of approximately $9.0 million. The Company used approximately $25.2 million of the net proceeds from the sale of the 2024 Convertible Notes and 2026 Convertible Notes to pay the cost of the Capped Calls, as

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described below. For purposes of this section, “Notes” refer to the 2024 Convertible Notes and the 2026 Convertible Notes, collectively.

The 2024 Convertible Notes and 2026 Convertible Notes were issued by the Company on August 12, 2019, pursuant to separate Indentures, each dated as of such date (each an “Indenture” and together the “Indentures”), between the Company and the Trustee. The 2024 Convertible Notes bear cash interest at the annual rate of 0.75% and the 2026 Convertible Notes bear cash interest at the annual rate of 1.50%, each payable on June 15 and December 15 of each year. The 2024 Convertible Notes will mature on June 15, 2024 and the 2026 Convertible Notes will mature on June 15, 2026, unless earlier converted or repurchased. The Company will settle conversions of the 2024 Convertible Notes and 2026 Convertible Notes through payment or delivery, as the case may be, of cash, shares of the Company’s Class A Common Stock or a combination of cash and shares of Class A Common Stock, at the Company’s option (subject to, and in accordance with, the settlement provisions of the applicable Indenture). The initial conversion rate for each of the 2024 Convertible Notes and the 2026 Convertible Notes is 74.6687 shares of Class A Common Stock (subject to adjustment as provided for in the applicable Indenture) per $1,000 principal amount of the 2024 Convertible Notes and 2026 Convertible Notes, which is equal to an initial conversion price of approximately $13.39 per share.

Holders of the 2024 Convertible Notes and 2026 Convertible Notes may convert their Notes at their option at any time prior to the close of business on the business day immediately preceding December 15, 2023, with respect to the 2024 Convertible Notes, and December 15, 2025, with respect to the 2026 Convertible Notes, in multiples of $1,000 principal amount, only under the following circumstances:

● during any calendar quarter commencing after the calendar quarter ending on December 31, 2019 (and only during such calendar quarter), if the last reported sale price of Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day;

● during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in each Indenture) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of Class A Common Stock and the conversion rate for the Notes on each such trading day; or

● upon the occurrence of specified corporate events described in each Indenture.

On or after December 15, 2023, with respect to the 2024 Convertible Notes, and December 15, 2025, with respect to the 2026 Convertible Notes, until the close of business on the second scheduled trading day immediately preceding the applicable maturity date, the holders of the Notes may convert their Notes, in multiples of $1,000 principal amount, regardless of the foregoing conditions.

If the Company experiences a fundamental change, as described in the Indentures, prior to the maturity date of the respective Notes, holders of such Notes will, subject to specified conditions, have the right, at their option, to require the Company to repurchase for cash all or a portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, to, but not including, the fundamental change repurchase date. If a make-whole fundamental change, as described in the Indentures, occurs and a holder elects to convert its Notes in connection with such make-whole fundamental change, such holder may be entitled to an increase in the conversion rate as described in the Indentures.

The Indentures do not contain any financial covenants or restrict the Company’s ability to repurchase the Company’s securities, pay dividends or make restricted payments in the event of a transaction that substantially increases the Company’s level of indebtedness. The Indentures provide for customary events of default. In the case of an event of default with respect to a series of Notes arising from specified events of bankruptcy or insolvency, all outstanding Notes of such series will become due and payable immediately without further action or notice. If any other event of default with respect to a series of Notes under the relevant Indenture occurs or is continuing, the Trustee or holders of at least 25% in aggregate principal amount of the then outstanding Notes of such series may declare the principal amount of such Notes to be immediately due and payable.

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In accordance with accounting guidance for debt with conversion and other options, the Company separately accounted for the liability and equity components of the 2024 Convertible Notes and the 2026 Convertible Notes by allocating the proceeds between the liability components and the embedded conversion options, or equity components, due to the Company’s ability to settle the 2024 Convertible Notes and the 2026 Convertible Notes in cash, its Class A Common Stock, or a combination of cash and Class A Common Stock at the option of the Company. The carrying amount of the respective liability components were calculated by measuring the fair value of a similar liability that does not have an associated conversion feature. The respective equity components of the 2024 Convertible Notes and the 2026 Convertible Notes were recognized as a debt discount and represent the difference between the gross proceeds from the issuance of the 2024 Convertible Notes and 2026 Convertible Notes and the fair value of the liability of the 2024 Convertible Notes and 2026 Convertible Notes on their respective dates of issuance. The debt discount is amortized to interest expense using the effective interest method over approximately five and seven years, or the expected life of the 2024 Convertible Notes and the 2026 Convertible Notes, respectively. The respective equity components are not remeasured as long as they continue to meet the conditions for equity classification.

The Company’s outstanding balances for the convertible senior notes as of December 31, 2020 and 2019 consisted of the following (in thousands):

	December 31,
	2020		2019
Liability component:
Principal:
2022 Convertible Notes	$	120,699	$	120,699
2024 Convertible Notes		200,000		200,000
2026 Convertible Notes		200,000		200,000
Less: unamortized debt discount		(83,900)		(104,700)
Less: unamortized debt issuance costs		(6,543)		(8,005)
Net carrying amount	$	430,256	$	407,994
Equity component:
2022 Convertible Notes		19,807		19,807
2024 Convertible Notes		41,152		41,152
2026 Convertible Notes		51,350		51,350
Total equity component	$	112,309	$	112,309

In connection with the issuance of the 2022 Convertible Notes, the Company incurred approximately $11.7 million of debt issuance costs, which primarily consisted of initial purchasers’ discounts and legal and other professional fees. The Company allocated these costs to the liability and equity components based on the allocation of the proceeds. The portion of these costs allocated to the equity components totaling approximately $4.0 million were recorded as a reduction to additional paid-in capital upon issuance. The portion of these costs allocated to the liability components totaling approximately $7.7 million were recorded as a reduction in the carrying value of the debt on the consolidated balance sheet and are amortized to interest expense using the effective interest method over the expected life of the 2022 Convertible Notes. In connection with the partial repurchase of the 2022 Convertible Notes, the Company recorded a loss on extinguishment of debt of approximately $23.4 million, of which approximately $2.8 million related to the initial debt issuance costs, during the year ended December 31, 2019.

The Company determined the expected life of the 2022 Convertible Notes was equal to their seven-year term. The effective interest rate on the liability components of the 2022 Convertible Notes for the period from the date of issuance through June 30, 2019 was 9.34%. From the date of the partial repurchase of the 2022 Convertible Notes in August 2019 through December 31, 2020, the effective interest rate on the liability component of the 2022 Convertible Notes was 9.7%.

In connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company incurred approximately $9.0 million of debt issuance costs, which primarily consisted of initial purchaser’s discounts and legal and other professional fees. The Company allocated these costs to the liability and equity components based on the allocation of the proceeds. The portion of these costs allocated to the equity components totaling approximately $2.1 million were recorded as a reduction to additional paid-in capital. The portion of these costs allocated to the liability components totaling approximately $6.9 million were recorded as a reduction in the carrying value of the debt on the

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consolidated balance sheet and are amortized to interest expense using the effective interest method over the expected lives of the 2024 Convertible Notes and the 2026 Convertible Notes.

The Company determined the expected life of the 2024 Convertible Notes and the 2026 Convertible Notes was equal to their approximately five and seven-year terms, respectively. The effective interest rates on the liability components of the 2024 Convertible Notes and the 2026 Convertible Notes for the period from the date of issuance through December 31, 2020 was 6.3% and 6.6%, respectively.

The following table sets forth total interest expense recognized related to convertible senior notes during the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Contractual interest expense	$	7,216	$	7,361	$	7,553
Amortization of debt issuance costs		1,462		1,190		971
Amortization of debt discount		20,800		17,683		15,437
Total interest expense	$	29,478	$	26,234	$	23,961

Future minimum payments under the convertible senior notes as of December 31, 2020, are as follows (in thousands):

2021	$	7,216
2022		126,557
2023		4,500
2024		203,750
2025		3,000
2026		201,500
Total future minimum payments under the convertible senior notes		546,523
Less: amounts representing interest		(25,824)
Less: unamortized debt discount		(83,900)
Less: unamortized debt issuance costs		(6,543)
Convertible senior notes balance	$	430,256

Convertible Note Hedge and Note Hedge Warrant Transactions with Respect to 2022 Convertible Notes

To minimize the impact of potential dilution to the Company's Class A common stockholders upon conversion of the 2022 Convertible Notes, the Company entered into the Convertible Note Hedges covering 20,249,665 shares of the Company’s Class A Common Stock in connection with the issuance of the 2022 Convertible Notes. The Convertible Note Hedges had an initial exercise price of $16.58 per share, subject to adjustment upon the occurrence of certain corporate events or transactions, and are exercisable if the 2022 Convertible Notes are converted. In connection with the adjustment to the conversion rate of the 2022 Convertible Notes related to the Separation in April 2019, the exercise price of the Convertible Note Hedges was adjusted to $14.51 per share and the number of shares underlying the Convertible Note Hedges was increased to 23,135,435 shares. If upon conversion of the 2022 Convertible Notes, the price of the Company’s Class A Common Stock is above the exercise price of the Convertible Note Hedges, the counterparties are obligated to deliver shares of the Company’s Class A Common Stock and/or cash with an aggregate value approximately equal to the difference between the price of the Company’s Class A Common Stock at the conversion date and the exercise price, multiplied by the number of shares of the Company’s Class A Common Stock related to the Convertible Note Hedge being exercised.

Concurrently with entering into the Convertible Note Hedges, the Company sold Note Hedge Warrants to the Convertible Note Hedge counterparties to acquire 20,249,665 shares of the Company’s Class A Common Stock, subject to customary anti-dilution adjustments. The strike price of the Note Hedge Warrants was initially $21.50 per share, subject to adjustment, and such warrants are exercisable over the 150 trading day period beginning on September 15, 2022. In connection with the Separation in April 2019, the exercise price was adjusted to $18.82 per share and the number of shares underlying the Note Hedge Warrants was increased to 23,135,435 shares. The Note Hedge Warrants

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could have a dilutive effect on the Class A Common Stock to the extent that the market price per share of the Company’s Class A Common Stock exceeds the applicable strike price of such warrants.

The Convertible Note Hedges and the Note Hedge Warrants are separate transactions entered into by the Company and are not part of the terms of the 2022 Convertible Notes. Holders of the Convertible Note Hedges and the Note Hedge Warrants do not have any rights with respect to the 2022 Convertible Notes. The Company paid approximately $91.9 million for the Convertible Note Hedges and received approximately $70.8 million for the Note Hedge Warrants, resulting in a net cost to the Company of approximately $21.1 million.

In August 2019, concurrently with the repurchase of $215.0 million aggregate principal amount of the 2022 Convertible Notes, the Company terminated the respective portion of the Convertible Note Hedges and Note Hedge Warrants. The Company received approximately $3.2 million of termination payments from the counterparties of the Convertible Note Hedges and Note Hedge Warrants.

The Convertible Note Hedges and Note Hedge Warrants are accounted for as derivative assets and liabilities, respectively, in accordance with ASC 815, and are remeasured to fair value at each reporting date (Note 7).

Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes

To minimize the impact of potential dilution to the Company’s Class A common stockholders upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into separate Capped Calls in connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes. The Company paid the counterparties approximately $25.2 million to enter into the Capped Calls.

The Capped Calls have an initial strike price of approximately $13.39 per share, which corresponds to the initial conversion price of the 2024 Convertible Notes and the 2026 Convertible Notes and is subject to anti-dilution adjustments generally similar to those applicable to the 2024 Convertible Notes and the 2026 Convertible Notes. The Capped Calls have a cap price of approximately $17.05 per share, subject to certain adjustments. The Capped Calls cover 29,867,480 shares of Class A Common Stock (subject to anti-dilution and certain other adjustments), which is the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes.

The Capped Calls are expected generally to reduce the potential dilution to the Class A Common Stock upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes in the event that the market price per share of Class A Common Stock is greater than the strike price of the Capped Calls as adjusted pursuant to the anti-dilution adjustments. If, however, the market price per share of Class A Common Stock exceeds the cap price of the Capped Calls, there would nevertheless be dilution upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes to the extent that such market price exceeds the cap price of the Capped Calls.

The Capped Calls are separate transactions entered into by and between the Company and the Capped Calls counterparties and are not part of the terms of the 2024 Convertible Notes or the 2026 Convertible Notes. Holders of the 2024 Convertible Notes and the 2026 Convertible Notes do not have any rights with respect to the Capped Calls. The Company recorded a reduction to additional paid-in capital of approximately $25.0 million during the year ended December 31, 2019 related to the premium payments for the Capped Calls. Additionally, the Company recorded an approximately $0.2 million reduction to equity related to transaction costs incurred in connection with the Capped Calls during the year ended December 31, 2019. These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met.

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12. Commitments and Contingencies

Commitments with AbbVie

The Company and AbbVie are jointly obligated to make minimum purchases of linaclotide API for the territories covered by the Company’s collaboration with AbbVie for North America. Currently, AbbVie fulfills all such minimum purchase commitments.

Under the collaboration agreement with AbbVie for North America, the Company shares all development and commercialization costs related to linaclotide in the U.S. with AbbVie. The actual amounts that the Company pays to AbbVie or that AbbVie pays to the Company will depend on numerous factors outside of the Company’s control, including the success of certain clinical development efforts with respect to linaclotide, the content and timing of decisions made by the regulators, the reimbursement and competitive landscape around linaclotide and the Company’s other product candidates, and other factors.

Other Funding Commitments

As of December 31, 2020, the Company has on-going studies in various pre-clinical and clinical trial stages. The Company’s most significant clinical trial expenditures are to contract research organizations. These contracts are generally cancellable, with notice, at the Company’s option and do not have any significant cancellation penalties.

Guarantees

As permitted under Delaware law, the Company indemnifies its directors and certain of its officers for certain events or occurrences while such director or officer is, or was, serving at the Company’s request in such capacity. The maximum potential amount of future payments the Company could be required to make is unlimited; however, the Company has directors’ and officers’ insurance coverage that is intended to limit its exposure and enable it to recover a portion of any future amounts paid.

The Company enters into certain agreements with other parties in the ordinary course of business that contain indemnification provisions. These typically include agreements with business partners, contractors, landlords, clinical sites and customers. Under these provisions, the Company generally indemnifies and holds harmless the indemnified party for losses suffered or incurred by the indemnified party as a result of the Company’s activities. These indemnification provisions generally survive termination of the underlying agreements. The maximum potential amount of future payments the Company could be required to make under these indemnification provisions is unlimited. However, to date the Company has not incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. As a result, the estimated fair value of these obligations is minimal. Accordingly, the Company did not have any liabilities recorded for these obligations as of December 31, 2020 and 2019.

Litigation

From time to time, the Company is involved in various legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. While the outcome of these other claims cannot be predicted with certainty, management does not believe that the outcome of any of these ongoing legal matters, individually and in aggregate, will have a material adverse effect on the Company’s consolidated financial statements.

In January 2020, the Company and AbbVie entered into settlement agreements with Sandoz Inc. and Teva Pharmaceuticals, USA resolving patent litigation brought in response to the last outstanding abbreviated new drug applications seeking approval to market generic versions of LINZESS prior to the expiration of the Company’s and AbbVie’s applicable patents.

In connection with litigation settlements the Company entered into in 2018, the Company agreed to pay an aggregate of $4.0 million in avoidance of litigation fees and expenses during the year ended December 31, 2018.

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13. Stockholders’ Equity

Preferred Stock

The Company’s preferred stock may be issued from time to time in one or more series, with each such series to consist of such number of shares and to have such terms as adopted by the board of directors. Authority is given to the board of directors to determine and fix such voting powers, full or limited, or no voting powers, and such designations, preferences and relative participating, optional or other special rights, and qualifications, limitation or restrictions thereof, including without limitation, dividend rights, conversion rights, redemption privileges and liquidation preferences.

Common Stock

The Company has one class of common stock (“Class A Common Stock”). Class A Common Stock is entitled to one vote per share. The Company has reserved, out of its authorized but unissued shares of Class A Common Stock, sufficient shares to effect the conversion of the convertible senior notes and the Note Hedge Warrants pursuant to the terms thereof (Note 11).

The Company’s shareholders are entitled to dividends if and when declared by the board of directors.

14. Employee Stock Benefit Plans

The Company has several share-based compensation plans under which stock options, RSAs, RSUs, and other share-based awards are available for grant to employees, officers, directors and consultants of the Company.

The following table summarizes share-based compensation expense by award type (in thousands):

	Year Ended December 31,
	2020		2019		2018
Stock options	$	7,680	$	12,526	$	20,478
Time-based restricted stock units		18,624		15,488		17,160
Performance-based restricted stock units		2,190		—		—
Restricted stock awards		1,886		2,095		2,330
Employee stock purchase plan		722		1,115		1,097
Stock awards		73		54		17
	$	31,175	$	31,278	$	41,082

The following table summarizes the share-based compensation expense reflected in the consolidated statements of operations (in thousands):

	Years Ended December 31,
	2020		2019		2018
Research and development	$	5,569	$	6,343	$	11,500
Selling, general and administrative		23,825		24,281		27,440
Restructuring expenses		1,781		654		2,142
	$	31,175	$	31,278	$	41,082

Restructuring expenses include modifications to share-based awards held by employees impacted by the various workforce reductions (Note 18).

In April 2019, in connection with the Separation, all outstanding share-based payment awards were modified in accordance with the equity conversion-related provisions of the employee matters agreement with Cyclerion. No share-based compensation expense was recognized in connection with these modifications. Additionally, modifications with respect to the Company’s ESPP were made due to the change in share price as a result of the Separation. As a result of the modification to the ESPP, the Company recorded approximately $0.3 million of share-based compensation expense for the year ended December 31, 2019.

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In connection with certain other modifications of share-based payment awards for the years ended December 31, 2020 and 2019, the Company recognized an insignificant amount and approximately $3.0 million in share-based compensation expense, respectively.

Stock Benefit Plans

As of December 31, 2020, the Company has the following active stock benefit plans pursuant to which awards are currently outstanding: the 2019 Equity Incentive Plan (the “2019 Equity Plan”), the Amended and Restated 2010 Employee Stock Purchase Plan (the “2010 Purchase Plan”) and the Amended and Restated 2010 Employee, Director, and Consultant Equity Incentive Plan (the “2010 Equity Plan”). At December 31, 2020, there were 14,357,176 shares available for future grant under the 2019 Equity Plan and the 2010 Purchase Plan.

2019 Equity Plan

During 2019, the Company’s stockholders approved the 2019 Equity Plan under which stock options, RSAs, RSUs, and other stock-based awards may be granted to employees, officers, directors, or consultants of the Company. Under the 2019 Equity Plan, 10,000,000 shares of Class A Common Stock were initially reserved for issuance. Awards that are returned to the 2010 Equity Plan as a result of their expiration, cancellation, termination or repurchase are automatically made available for issuance under the 2019 Equity Plan. Awards that expire, cancel, terminate, or are repurchased under the 2019 Equity Plan will no longer be available for future grant. As of December 31, 2020, 9,651,783 shares were available for future grant under the 2019 Equity Plan.

2010 Purchase Plan

During 2010, the Company’s stockholders approved the 2010 Purchase Plan, which gives eligible employees the right to purchase shares of common stock at the lower of 85% of the fair market value on the first or last day of an offering period. Each offering period is six months. There were 400,000 shares of common stock initially reserved for issuance pursuant to the 2010 Purchase Plan. The number of shares available for future grant under the 2010 Purchase Plan may be increased on the first day of each fiscal year by an amount equal to the lesser of: (i) 1,000,000 shares, (ii) 1% of the Class A shares of common stock outstanding on the last day of the immediately preceding fiscal year, or (iii) such lesser number of shares as is determined by the board of directors. As of December 31, 2020, there were 4,705,393 shares available for future grant under the 2010 Purchase Plan.

2010 Equity Plan

The 2010 Equity Plan provided for the granting of stock options, RSAs, RSUs, and other share-based awards to employees, officers, directors, consultants, or advisors of the Company. At December 31, 2020, there were no shares available for future grant under the 2010 Equity Plan.

Restricted Stock Awards

RSAs are granted to non-employee members of the board of directors under restricted stock agreements in accordance with the terms of the 2019 Equity Plan and the Company’s non-employee director compensation policy, effective May 2019. Annual restricted stock grants to each non-employee member of the board of directors vest ratably over the period of service from the grant date through the Company’s 2021 annual meeting of stockholders, provided the individual continues to serve on the Company’s board of directors through each vest date. Initial restricted stock grants to new non-employee members of the board of directors vest annually over a three-year period from the date of grant provided the individual continues to serve on the Company’s board of directors through each vest date.

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A summary of restricted stock activity for the year ended December 31, 2020 is presented below:

		Weighted-
		Average
	Number of	Grant Date
	Shares	Fair Value
Unvested as of December 31, 2019	181,648	$	10.76
Granted	246,500		10.16
Vested	(181,648)		10.46
Forfeited	—		—
Unvested as of December 31, 2020	246,500	$	10.38

The weighted-average grant date fair value per share of restricted stock awards granted during the years ended December 31, 2020, 2019, and 2018 was $10.16, $10.96, and $18.58, respectively. Amounts relating to restricted stock awards granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the Company’s stock price.

Restricted Stock Units

RSUs granted under the Company’s equity plans represent the right to receive one share of the Company’s Class A Common Stock pursuant to the terms of the applicable award agreement. Shares of the Company’s Class A Common Stock are delivered to the employee upon vesting, subject to payment of applicable withholding taxes.

Time-based RSUs

Time-based RSUs generally vest over a two-to-four-year period on the approximate anniversary of the date of grant until fully vested, provided the individual remains in continuous service with the Company through each vesting date. The fair value of all time-based RSUs is based on the market value of the Company's Class A Common Stock on the date of grant. Compensation expense, including the effect of estimated forfeitures, is recognized over the applicable service period.

A summary of time-based RSU activity for the year ended December 31, 2020 is as follows:

		Weighted-
		Average
	Number	Grant Date
	of RSUs	Fair Value
Outstanding as of December 31, 2019	3,207,089	$	12.33
Granted	2,708,200		11.59
Vested and released	(965,625)		12.37
Forfeited	(779,038)		11.96
Outstanding as of December 31, 2020	4,170,626	$	11.90

The weighted-average grant date fair value per share of time-based RSUs granted during the years ended December 31, 2020, 2019, and 2018 was $11.59, $12.11, and $15.63, respectively. Amounts relating to time-based RSUs granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the Company’s stock price.

Performance-based RSUs

Performance-based RSUs (“PSUs”) were granted to certain executives in 2020. PSUs vest upon the achievement of specified performance criteria over a two to three-year performance period, generally subject to the executive remaining in continuous service with the Company through the applicable vesting dates. The performance criteria applicable to the PSUs were (i) gaining the U.S. FDA’s acceptance of one or more additional New Drug Applications through internal development or acquisition of development-stage or commercial-stage programs (“Pipeline PSUs”), (ii) achieving certain profitability metrics (“Profitability PSUs”) and (iii) realizing relative total shareholder return goals (the “Relative TSR PSUs”).

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The fair value of Pipeline PSUs and Profitability PSUs is based on the market value of the Company's Class A Common Stock on the date of grant. The Relative TSR PSUs are valued using the Monte Carlo simulation method on the date of grant. The weighted average assumptions used to estimate the fair value of Relative TSR PSUs were as follows for the year ended December 31, 2020:

	Year Ended December 31,
	2020
Fair value of common stock	$ 11.78
Expected volatility	53.3	%
Expected term (in years)	2.8
Risk-free interest rate	1.0	%
Expected dividend yield	—	%

A summary of PSU activity for the year ended December 31, 2020 is as follows:

		Weighted-
		Average
	Number	Grant Date
	of RSUs	Fair Value(1)
Outstanding as of December 31, 2019	—	$	—
Granted	586,157		12.48
Vested and released	—		—
Forfeited	—		—
Outstanding as of December 31, 2020	586,157	$	12.48

No PSUs were granted prior to the year ended December 31, 2020.

Stock Options

Stock options granted under the Company’s equity plans represent the right to purchase one share of the Company’s Class A Common Stock pursuant to the terms of the applicable award agreement. Shares of the Company's Class A Common Stock are delivered to the employee upon exercise, subject to payment of applicable withholding taxes.

As of April 2020, the Company no longer grants stock options. Stock options previously granted under the Company’s equity plans generally have a ten-year term and vest over a period of four years, provided the individual continues to serve at the Company through the vesting dates. Options granted under all equity plans are exercisable at a price per share not less than the fair market value of the underlying common stock on the date of grant. The estimated fair value of options, including the effect of estimated forfeitures, is recognized over the requisite service period, which is typically the vesting period of each option.

The weighted average assumptions used to estimate the fair value of the stock options using the Black-Scholes option-pricing model were as follows for the years ended December 31, 2020, 2019, and 2018:

	Years Ended December 31,
	2020		2019		2018
Expected volatility	46.6	%	46.3	%	43.7	%
Expected term (in years)	6.1		6.1		6.0
Risk-free interest rate	1.5	%	2.5	%	2.7	%
Expected dividend yield	—	%	—	%	—	%

Expected volatility is based on the historical volatility of the Company’s Class A Common Stock. The Company estimates the expected term using historical data. The risk-free interest rate used for each grant is based on a zero-coupon U.S. Treasury instrument with a remaining term similar to the expected term of the share-based award. The

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Company has not paid and does not anticipate paying cash dividends on its shares of common stock in the foreseeable future; therefore, the expected dividend yield is assumed to be zero.

The weighted-average grant date fair value per share of options granted during the years ended December 31, 2020, 2019, and 2018 was $5.89, $6.10, and $6.81, respectively. Amounts relating to stock options granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the Company’s stock price.

The Company historically granted to certain employees performance-based options to purchase shares of common stock. These options are subject to performance-based milestone vesting. During the years ended December 31, 2020 and 2019, there were no shares that vested as a result of performance milestone achievements. The Company recorded no share-based compensation expense related to these performance-based options during each of the years ended December 31, 2020, 2019, and 2018.

The following table summarizes stock option activity under the Company’s share-based compensation plans, including performance-based options:

		Weighted-		Weighted-
	Number of	Average		Average	Aggregate
	Stock	Exercise		Contractual	Intrinsic
	Options	Price(1)		Life	Value
				(in years)	(in thousands)
Outstanding at December 31, 2019	17,194,239	$	12.13	5.11	$	25,226
Granted	55,000		12.84	—		—
Exercised	(1,735,081)		10.21	—		—
Cancelled	(2,054,487)		13.00	—		—
Outstanding at December 31, 2020	13,459,671		12.25	4.27		5,613
Vested or expected to vest at December 31, 2020	13,280,456		12.26	4.23		5,575
Exercisable at December 31, 2020	11,963,812		12.26	3.90		5,371

(1) Exercise prices relating to stock options granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the stock options.

The total intrinsic value of options exercised during the years ended December 31, 2020, 2019, and 2018 was approximately $3.5 million, approximately $5.1 million, and approximately $20.1 million, respectively. The intrinsic value was calculated as the difference between the fair value of the Company’s Class A Common Stock and the exercise price of the option issued.

The following table sets forth the Company's unrecognized share-based compensation expense, net of estimated forfeitures, as of December 31, 2020, by type of award and the weighted-average period over which that expense is expected to be recognized:

	Unrecognized		Weighted-Average
	Expense, Net		Remaining
	of Estimated		Recognition
	Forfeitures		Period
	(in thousands)		(in years)
Type of award:
Stock options with time-based vesting	$	6,557	1.84
Restricted stock awards		1,473	0.92
Time-based restricted stock units		26,934	2.22
Performance-based restricted stock units		3,291	1.70
Stock options with time-based and performance-based vesting (1)		88	—

(1) The weighted-average remaining recognition period cannot be determined for performance-based or time-accelerated options due to the nature of such awards, as detailed above.

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The total unrecognized share-based compensation cost will be adjusted for future changes in estimated forfeitures.

15. Income Taxes

During the year ended December 31, 2020, the Company recorded approximately $2.7 million in income tax expense related to state income tax, which primarily resulted from a change in California tax which temporarily disallows the use of net operating losses to offset taxable income. The Company did not record a provision for federal income taxes for the period ended December 31, 2020, as it offset taxable income with federal net operating losses and continues to record a full valuation allowance against net deferred tax assets. The Company did not record a provision for federal, state, or foreign income taxes for the period ended December 31, 2019 and 2018, respectively, because the Company incurred a tax loss during these years and offset the benefit of these tax losses with valuation allowance. The Company has not recorded a foreign tax provision as it has had cumulative net operating losses outside of the United States since inception.

On March 27, 2020. the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act was enacted and signed into law. The Company benefitted from certain provisions of the CARES Act, specifically, the increase in allowable business interest deduction from 30% of adjusted taxable income to 50% of adjusted taxable income, which allowed the Company to take additional interest deductions for the period ended December 31, 2020. Additionally, the Company was able to claim 100% bonus depreciation on leasehold improvements incurred in the period ended December 31, 2019 and 2020.

A reconciliation of income taxes computed using the U.S. federal statutory rate of 21% to that reflected in the consolidated statements of operations are as follows (in thousands):

	Year Ended December 31,
	2020		2019		2018
Income tax benefit using U.S. federal statutory rate	$	22,861	$	4,517	$	(59,297)
Permanent differences		74		65		218
State income taxes, net of federal benefit		7,565		(1,902)		(17,121)
Disallowed Separation related costs		—		4,658		—
Executive compensation - Section 162(m)		1,718		662		8
Meals and entertainment		395		495		995
Non-deductible share-based compensation		(144)		(1,202)		(494)
Excess tax benefits		5,132		3,324		(1,223)
Fair market valuation of Note Hedge Warrants and Convertible Note Hedges		1,680		(290)		2,367
Tax credits		(3,149)		(4,374)		(7,863)
Expiring net operating losses and tax credits		1,991		3,764		250
Effect of change in state tax rate on deferred tax assets and deferred tax liabilities		(208)		(2,563)		1,476
Change in the valuation allowance		(35,230)		(7,154)		80,684
Income tax expense	$	2,685	$	—	$	—

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Deferred tax assets and liabilities were determined based on the difference between financial statement and tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The components of the Company’s deferred tax assets and liabilities are as follows (in thousands):

	December 31,
	2020		2019
Deferred tax assets:
Net operating loss carryforwards	$	234,772	$	265,494
Tax credit carryforwards		60,607		59,892
Capitalized research and development		7,498		9,952
Share-based compensation		21,848		24,401
Basis difference on collaboration agreement for North America with AbbVie		62,629		48,594
Accruals and reserves		6,114		6,415
Basis difference on 2022 Convertible Notes		6,183		4,322
Interest expense		3,386		22,020
Operating lease liability		6,504		6,421
Other		5,049		5,295
Total deferred tax assets		414,590		452,806
Deferred tax liabilities:
Basis difference on 2024 Convertible Notes		(5,951)		(7,381)
Basis difference on 2026 Convertible Notes		(9,022)		(10,276)
Operating lease right-of-use assets		(4,603)		(4,905)
Total deferred tax liabilities		(19,576)		(22,562)
Net deferred tax asset		395,014		430,244
Valuation allowance		(395,014)		(430,244)
Net deferred tax asset	$	—	$	—

On a periodic basis, the Company reassesses the valuation allowance on its deferred income tax assets weighing positive and negative evidence to assess the recoverability of the deferred tax assets. Management evaluated the positive evidence, including income during the year ended December 31, 2020, and negative evidence, including its cumulative losses in recent years and its plan to build its innovative GI pipeline through potential acquisition or in-licensing externally development products, and concluded that it is more likely than not that the Company will not realize the benefit of its deferred tax assets for the year ended December 31, 2020. Accordingly, the net deferred tax assets have been fully offset by a valuation allowance as of December 31, 2020 and 2019. Management re-evaluates the positive and negative evidence on a quarterly basis. Based on the Company’s financial performance and its future projections, it may record a reversal of all, or a portion of the valuation allowance associated with its deferred tax assets in future periods. However, any such change is subject to actual performance and other considerations that may present positive or negative evidence at the time of the assessment. The Company’s total deferred tax asset balance subject to a valuation allowance was $395.0 million and approximately $430.2 million as of December 31, 2020 and 2019, respectively.

The valuation allowance decreased approximately $35.2 million during the year ended December 31, 2020 primarily due to the Company’s offsetting taxable income with previously disallowed interest expense and net operating losses, partially offset by an increase in deferred tax asset for the basis difference of the collaboration agreement for North America with AbbVie.

The valuation allowance decreased approximately $29.1 million during the year ended December 31, 2019 primarily due to establishment of a deferred tax liability for a basis difference in the 2024 Convertible Notes and 2026 Convertible Notes, partially offset by an increase in the deferred tax asset for temporarily disallowed interest expense.

Subject to the limitations described below, at December 31, 2020, the Company had federal net operating loss carryforwards of approximately $1.1 billion of which approximately $1.0 billion is subject to an expiration between 2021 and 2037 and $0.1 billion may be carried forward indefinitely. As of December 31, 2020, the Company had state net operating loss carryforwards of approximately $0.9 billion to offset future state taxable income, which is subject to expiration between 2021 and 2039. The Company also had tax credit carryforwards of approximately $65.3 million as of December 31, 2020 to offset future federal and state income taxes, which is subject to expiration at various times through 2040.

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Utilization of net operating loss carryforwards and research and development credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that could occur in the future in accordance with Section 382 of the Internal Revenue Code of 1986 (“IRC Section 382”) and with Section 383 of the Internal Revenue Code of 1986, as well as similar state provisions. These ownership changes may limit the amount of net operating loss carryforwards and research and development credit carryforwards that can be utilized annually to offset future taxable income and taxes, respectively. In general, an ownership change, as defined by IRC Section 382, results from transactions increasing the ownership of certain stockholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period.

The following table summarizes the changes in the Company’s unrecognized income tax benefits for the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Balance at the beginning of the period	$	53,099	$	38,551	$	24,078
Increases based on tax positions related to the current period		66,687		51,699		38,551
Increases for tax positions related to prior periods		—		1,400		—
Decreases for tax positions in prior periods		(51,699)		(38,551)		(24,078)
Balance at the end of the period	$	68,087	$	53,099	$	38,551

The Company had gross unrecognized tax benefits of approximately $68.1 million, approximately $53.1 million, and approximately $38.6 million as of December 31, 2020, 2019 and 2018, respectively. Of the approximately $68.1 million of total unrecognized tax benefits at December 31, 2020, approximately $0.8 million would, if recognized, affect the Company’s effective tax rate, and the remaining amount would not affect the Company’s effective tax rate due to a valuation allowance against the Company’s net deferred tax assets. A reserve for uncertain tax positions of approximately $0.8 million is recorded in other liabilities on the Company’s consolidated balance sheet as of December 31, 2020.

The Company will recognize interest and penalties, if any, related to uncertain tax positions in income tax expense. As of December 31, 2020, no interest or penalties have been accrued.

The statute of limitations for assessment by the Internal Revenue Service (“IRS”) and state tax authorities is open for tax years ended December 31, 2017 through the present, although net operating losses generated from years prior to 2017 could be subject to examination and adjustments to the extent utilized in future years. There are currently no federal or state income tax audits in progress.

16. Defined Contribution Plan

The Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan is a defined contribution plan in the form of a qualified 401(k) plan in which substantially all employees are eligible to participate upon employment. Subject to certain IRS limits, eligible employees may elect to contribute from 1% to 100% of their compensation. Company contributions to the plan are at the sole discretion of the Company’s board of directors. Currently, the Company provides a matching contribution of 75% of the employee’s contributions, up to $6,000 annually. During the years ended December 31, 2020, 2019, and 2018, the Company recorded approximately $1.8 million, approximately $2.2 million, and approximately $3.2 million of expense related to its 401(k) company match, respectively.

17. Related Party Transactions

The Company previously reflected amounts due to and due from Allergan prior to its acquisition by AbbVie as related party accounts payable and related party accounts receivable, respectively. Following the acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company. As such, only historical amounts paid to and received from Allergan (prior to its acquisition by AbbVie) are considered related party accounts payable and related party accounts receivable, respectively. Balances of related party accounts payable and related party accounts receivable, respectively, were reported net of any balances due to or from the related party.

F-54

In connection with the Separation, the Company executed certain contracts with Cyclerion, whose President and Chief Scientific Officer at the time of the Separation became a member of the Company’s Board of Directors in April 2019 (Note 3). As of December 31, 2020, Cyclerion was no longer considered a related party.

18. Workforce Reductions and Restructuring

During the years ended December 31, 2020, 2019, and 2018 the Company recorded approximately $15.4 million, approximately $3.6 million, and approximately $14.7 million in restructuring expenses, respectively, in its consolidated statement of operations.

In January 2018, the Company commenced an initiative to evaluate the optimal mix of investments for the lesinurad franchise. As part of this effort, the Company reduced its field-based workforce by approximately 60 employees, primarily consisting of field-based sales representatives that promoted DUZALLO or ZURAMPIC in the first position. During the three months ended March 31, 2018, the Company substantially completed this reduction in field-based workforce and recorded approximately $2.4 million of severance, benefits and related costs as restructuring expenses during the year ended December 31, 2018 related to this reduction in workforce.

In June 2018, the Company determined the initial organizational designs of the two new businesses, including employees’ roles and responsibilities, in connection with the Separation. As part of this process, the Company initiated a reduction in its headquarters-based workforce by approximately 40 employees and substantially completed the reduction in its workforce during the year ended December 31, 2018. During the year ended December 31, 2018, the Company recorded approximately $4.0 million of severance, benefits and related costs as restructuring expenses related to this reduction in workforce.

In August 2018, the Company initiated a reduction in its workforce by approximately 100 employees, primarily consisting of field-based sales representatives in connection with the termination of the Lesinurad License and substantially completed the reduction in its workforce and recorded associated costs during the year ended December 31, 2018. During the years ended December 31, 2020 and 2019, the Company recorded an insignificant amount of adjustments to restructuring costs related to this workforce reduction. During the year ended December 31, 2018, the Company recorded approximately $8.3 million of restructuring expenses, including approximately $5.4 million of severance, benefits and related costs and approximately $2.9 million of contract-related costs, including the write-down of certain prepaid assets and deposits, in connection with this reduction in workforce.

In February 2019, following further analysis of the Company’s strategy and core business needs, and in an effort to further strengthen the operational efficiency of the organization, the Company commenced a reduction in workforce by approximately 35 employees, primarily based in the home office and substantially completed the reduction in its workforce and recorded associated costs during the year ended December 31, 2019. During the year ended December 31, 2019, the Company recorded approximately $3.7 million of severance, benefits and related costs as restructuring expenses related to this reduction in workforce.

In September 2020, the Company announced that one of its two identical Phase III trials evaluating IW-3718 in refractory GERD did not meet certain criteria, including the study’s primary endpoint of achieving a statistically significant improvement in heartburn severity. Based on these findings, the Company is discontinuing development of IW-3718. In connection with this decision, the Company reduced its workforce by approximately 100 full-time employees. This workforce reduction affected both field-based and home-office employees, including the relevant general and administrative support functions. The Company substantially completed the reduction in its workforce in the fourth quarter of 2020. The Company incurred approximately $15.5 million during the year ended December 31, 2020 in restructuring expenses, primarily for severance, benefits and related costs related to this reduction in force. Restructuring expenses during the year ended December 31, 2020 also included approximately $1.2 million related to the impairment of certain fixed assets as a result of the Company’s decision to discontinue IW-3718 development.

F-55

The following table summarizes the accrued liabilities activity recorded in connection with the reductions in workforce and related restructuring activities during the year ended December 31, 2020 (in thousands):

	Amounts								Amounts
	Accrued at								Accrued at
	December 31, 2019		Charges		Amount Paid		Adjustments		December 31, 2020
Employee severance, benefits and related costs
February 2019 Reduction		75		—		(75)		—		—
September 2020 Reduction		—		11,563		(661)		—		10,902
Total	$	75	$	11,563	$	(736)	$	—	$	10,902
Contract related costs
August 2018 Reduction	$	104	$	—	$	—	$	(104)	$	—
September 2020 Reduction		—		108		(103)		—		5
Total	$	104	$	108	$	(103)	$	(104)	$	5

The following table summarizes the accrued liabilities activity recorded in connection with the reductions in workforce and related restructuring activities during the year ended December 31, 2019 (in thousands):

	Amounts								Amounts
	Accrued at								Accrued at
	December 31, 2018		Charges		Amount Paid		Adjustments		December 31, 2019
Employee severance, benefits and related costs
June 2018 Reduction	$	696	$	16	$	(689)	$	(23)	$	—
August 2018 Reduction		1,756		—		(1,708)		(48)		—
February 2019 Reduction		—		3,182		(2,968)		(139)		75
Total	$	2,452	$	3,198	$	(5,365)	$	(210)	$	75
Contract related costs
August 2018 Reduction	$	433	$	—	$	(287)	$	(42)	$	104
Total	$	433	$	—	$	(287)	$	(42)	$	104

19. Selected Quarterly Financial Data (Unaudited)

The following table contains quarterly financial information for the years ended December 31, 2020 and 2019. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.

	First		Second		Third		Fourth		Total
	Quarter		Quarter		Quarter		Quarter		Year
	(in thousands, except per share data)
2020
Total revenues (1)	$	79,943	$	89,432	$	103,468	$	116,680	$	389,523
Total cost and expenses (2)		66,716		56,719		57,852		65,296		246,583
Other expense, net (3)		(9,882)		(7,509)		(9,804)		(6,884)		(34,079)
Net income and comprehensive income		3,345		25,204		34,423		43,204		106,176
Net income per share—basic		0.02		0.16		0.22		0.27		0.67
Net income per share—diluted		0.02		0.16		0.21		0.27		0.66

F-56

	First		Second		Third		Fourth		Total
	Quarter		Quarter		Quarter		Quarter		Year
	(in thousands, except per share data)
2019
Total revenues (4)	$	68,730	$	102,215	$	131,167	$	126,301	$	428,413
Total cost and expenses (5)		85,663		80,638		65,280		76,709		308,290
Other expense, net (6)		(4,912)		(9,294)		(45,239)		(1,735)		(61,180)
Net (loss) income from continuing operations		(21,846)		12,283		20,648		47,858		58,943
Net loss from discontinued operations(7)		(37,438)		—		—		—		(37,438)
Net income (loss) and comprehensive income (loss)		(59,284)		12,283		20,648		47,858		21,505
Income per share from continuing operations, net of income taxes—basic	$	(0.14)	$	0.08	$	0.13	$	0.31	$	0.38
Income per share from continuing operations, net of income taxes—diluted		(0.14)		0.08		0.13		0.30		0.38
Net loss per share from discontinued operations—basic and diluted		(0.24)		—		—		—		(0.24)
Net income (loss) per share—basic		(0.38)		0.08		0.13		0.31		0.14
Net income (loss) per share—diluted		(0.38)		0.08		0.13		0.30		0.14

(1) Total revenues includes approximately $8.0 million of revenue from sales of linaclotide API to the Company’s linaclotide partners for the year ended December 31, 2020.

(2) Total costs and expenses includes approximately $15.4 million in restructuring expenses for the year ended December 31, 2020.

(3) Other expense, net includes approximately $6.1 million loss on fair value remeasurement of derivatives for the year ended December 31, 2020.

(4) Total revenues includes approximately $48.8 million of revenue from sales of linaclotide API to the Company’s linaclotide partners, primarily driven by the commercialization of linaclotide in Japan for the year ended December 31, 2019, as well as approximately $32.4 million related to the non-contingent payments from the Amended AstraZeneca Agreement and a $10.0 million upfront fee from the Amended Astellas License Agreement, both executed during the third quarter of 2019.

(5) Total costs and expenses includes approximately $3.6 million in restructuring expenses for the year ended December 31, 2019, as well as approximately $3.2 million related to the gain on lease modification in April 2019.

(6) Other expense, net includes approximately $31.0 million in loss on extinguishment of debt related to the partial repurchase of the 2022 Convertible Notes and the redemption of the 2026 Notes, and approximately $3.0 million gain on fair value remeasurement of derivatives for the year ended December 31, 2019.

(7) During the year ended December 31, 2019, the Company completed the Separation. Certain amounts related to Cyclerion have been reclassified as discontinued operations for the year ended December 31, 2019.

20. Subsequent Events

On February 4, 2021, Mark Mallon notified the Company that he is resigning from his position as Chief Executive Officer of the Company and a member of the Company’s board of directors, in each case effective March 12, 2021 (the “Transition Date”). Upon the Transition Date, Thomas McCourt, who is the President of the Company, also will become the Company’s interim Chief Executive Officer. Mr. Mallon’s resignation is not due to any disagreement with the Company on any matter relating to the Company’s operations, policies, or practices.

F-57

EX-4.5

Exhibit 4.5

DESCRIPTION OF THE REGISTRANT’S SECURITIES REGISTERED PURSUANT TO SECTION 12 OF THE SECURITIES EXCHANGE ACT OF 1934

Unless the context otherwise requires, all references to the “Company,” “we,” “us” and “our” in this Exhibit 4.5 refer to Ironwood Pharmaceuticals, Inc.

General

The following is a summary of the material rights of our capital stock and related provisions of our eleventh amended and restated certificate of incorporation (as modified by the certificate of retirement with respect to our Class B common stock, effective December 31, 2018,  and the certificate of amendment to our eleventh amended and restated certificate of incorporation, effective May 30, 2019, or certificate of amendment), or certificate of incorporation, and fifth amended and restated bylaws, or bylaws. The following description of our capital stock does not purport to be complete and is subject to, and qualified in its entirety by, our certificate of incorporation and bylaws, all of which are included or incorporated by reference as exhibits to the Company’s Annual Report on Form 10-K.

Our certificate of incorporation provides that we have one series of common stock, Class A common stock. Our authorized capital stock consists of 675,000,000 shares, each with a par value of $0.001 per share, of which 600,000,000 shares are designated common stock, including 500,000,000 shares of Class A common stock and 100,000,000 shares that not designated to a series, and 75,000,000 shares of preferred stock. The rights, preferences and privileges of the preferred stock may be designated from time to time by our board of directors.

Common Stock

Voting Rights

Each share of common stock has one vote per share on all matters submitted to a vote of stockholders.

We have not provided for cumulative voting for the election of directors in our certificate of incorporation. Because our certificate of incorporation does provide for plurality voting for the election of directors, a director may be elected even if less than a majority of the votes cast are in favor of such election.

Dividends

Subject to preferences that may apply to any shares of preferred stock outstanding at the time, the holders of common stock will be entitled to share equally in any dividends that our board of directors may determine to issue from time to time. In the event a dividend is paid in the form of shares of common stock or rights to acquire shares of common stock, the holders of common stock will receive common stock, or rights to acquire common stock, as the case may be.

We have never declared or paid any cash dividends on our capital stock, and we do not currently anticipate declaring or paying cash dividends on our capital stock in the foreseeable future. We currently intend to retain all of our future earnings, if any, to finance operations. Any future determination relating to our dividend policy will be made at the discretion of our board of directors and will depend on a number of factors, including future earnings, capital requirements, financial conditions, future prospects, contractual restrictions and covenants and other factors that our board of directors may deem relevant.

Liquidation Rights

Upon our liquidation, dissolution, distribution of assets or winding-up, the holders of common stock will be entitled to share equally all assets remaining after the payment of any liabilities and the liquidation preferences on any outstanding preferred stock.

Conversion

Our common stock is not convertible into any other shares of our capital stock.

Transfer Agent and Registrar

The Transfer Agent and Registrar for our common stock is currently Computershare Trust Company, N.A. Its address is 250 Royall Street, Canton, MA 02021.

Listing

Our common stock is listed on The Nasdaq Global Select Market under the symbol “IRWD.”

Preferred Stock

No shares of our preferred stock are outstanding. Our board of directors has the authority, without approval by the stockholders, to issue up to a total of 75,000,000 shares of preferred stock, par value $0.001 per share, all of which is undesignated, in one or more series.

Our board of directors may establish the number of shares to be included in each such series and may fix the designations, preferences, powers and other rights of the shares of a series of preferred stock. Our board could authorize the issuance of preferred stock with voting or conversion rights that could dilute the voting power or rights of the holders of common stock. The issuance of preferred stock, while providing flexibility in connection with possible acquisitions and other corporate purposes, could, among other things, have the effect of delaying, deferring or preventing a change in control of the Company and might harm the market price of our common stock. Our board of directors will make the determination to issue such shares based on its judgment as to our best interests and the best interests of our stockholders.

Anti-Takeover Effects of our Certificate of Incorporation and Bylaws and Delaware Law

Certain provisions of Delaware law, our certificate of incorporation and our bylaws could have the effect of delaying, deferring or discouraging another party from acquiring control of us. These provisions, which are summarized below, encourage persons seeking to acquire control of us to first negotiate with our board of directors and the holders of our capital stock.

Undesignated Preferred Stock

The ability to authorize undesignated preferred stock makes it possible for our board of directors to issue preferred stock with voting or other rights or preferences that could impede the success of any attempt to acquire us. These and other provisions may have the effect of deferring hostile takeovers or delaying changes in control or management of our company.

Limits on Ability of Stockholders to Act by Written Consent

We have provided in our certificate of incorporation that our stockholders may not act by written consent. In addition, our certificate of incorporation also requires that special meetings of stockholders be called only by our board of directors, our chairman, our chief executive officer or our president if there is no chief executive officer. This limit on the ability of our stockholders to act by written consent or to call a special meeting may lengthen the amount of time required to take stockholder actions. As a result, a holder controlling a majority of our capital stock would not be able to amend our bylaws or remove directors without holding a stockholders meeting.

Requirements for Advance Notification of Stockholder Nominations and Proposals

Our bylaws establish advance notice procedures with respect to stockholder proposals and the nomination of candidates for election as directors, other than nominations made by or at the direction of the board of directors or a committee of the board of directors. The bylaws do not give the board of directors the power to approve or

disapprove stockholder nominations of candidates or proposals regarding business to be conducted at a special or annual meeting of the stockholders. However, our bylaws may have the effect of precluding the conduct of certain business at a meeting if the proper procedures are not followed. These provisions may also discourage or deter a potential acquirer from conducting a solicitation of proxies to elect the acquirer’s own slate of directors or otherwise attempting to obtain control of our company.

Board of Directors

Eleven individuals currently serve on our board of directors. Our board of directors is currently divided into three classes serving staggered terms, such that not all members of the board are elected at one time. This staggered board structure prevents stockholders from replacing the entire board at a single stockholders’ meeting.  The certificate of amendment provides for the declassification of the board of directors, to allow our stockholders to vote on the election of the entire board of directors on an annual basis, rather than on a staggered basis.  This declassification is being phased in such that, once completed as of the 2022 annual meeting of stockholders and at each annual meeting of stockholders thereafter, all directors will stand for election for one-year terms.

Our certificate of incorporation authorizes our board of directors, by a resolution of the majority of our board of directors, to fix the number of directors from time to time and to appoint new directors to fill any vacancies.  For so long as our board of directors is classified, directors may be removed by our stockholders only for cause and any additional directorships resulting from an increase in the number of directors will be distributed among the three classes. These provisions may prevent a stockholder from removing incumbent directors and simultaneously gaining control of the board of directors by filling the resulting vacancies with its own nominees. Consequently, the existence of these provisions may have the effect of deterring hostile takeovers, which could depress the market price of our common stock. As required by Delaware law, once the board of directors is declassified, stockholders may remove directors with or without cause.

Delaware Anti-Takeover Statute

We are subject to Section 203 of the Delaware General Corporation Law. This statute regulating corporate takeovers prohibits a Delaware corporation from engaging in any business combination with any interested stockholder for three years following the date that the stockholder became an interested stockholder, unless:

● prior to the date of the transaction, the board of directors of the corporation approved either the business combination or the transaction which resulted in the stockholder becoming an interested stockholder;

● upon completion of the transaction that resulted in the interested stockholder becoming an interested stockholder, the interested stockholder owned at least 85% of the voting stock of the corporation outstanding at the time the transaction commenced, excluding for purposes of determining the number of shares outstanding (a) shares owned by persons who are directors and also officers, and (b) shares owned by employee stock plans in which employee participants do not have the right to determine confidentially whether shares held subject to the plan will be tendered in a tender or exchange offer; or

● on or subsequent to the date of the transaction, the business combination is approved by the board of directors and authorized at an annual or special meeting of stockholders, and not by written consent, by the affirmative vote of at least 66 2/3% of the outstanding voting stock which is not owned by the interested stockholder.

Generally, a business combination includes a merger, asset or stock sale, or other transaction resulting in a financial benefit to the interested stockholder. An interested stockholder is any person who, together with such person’s affiliates and associates (i) owns 15% or more of a corporation’s voting securities or (ii) is an affiliate or associate of a corporation and was the owner of 15% or more of the corporation’s voting securities at any time within the three year period immediately preceding a business combination of the corporation governed by Section 203. We expect the existence of this provision to have an anti-takeover effect with respect to transactions our board

of directors does not approve in advance. We also anticipate that Section 203 may discourage takeover attempts that might result in a premium over the market price for the shares of common stock held by our stockholders.

EX-10.13.1

Exhibit 10.13.1

AMENDMENT

TO

THE AMENDED AND RESTATED LICENSE AGREEMENT

THIS AMENDMENT TO THE AMENDED AND RESTATED LICENSE AGREEMENT (this “Amendment”) is made on January 8, 2021 by and between Ironwood Pharmaceuticals, Inc. (“Ironwood”) and Astellas Pharma Inc. (“Astellas”) with reference to that certain AMENDED AND RESTATED LICENSE AGREEMENT entered into as of August 1, 2019 by and between Ironwood and Astellas (the “Agreement”). The Parties hereto desire to amend the Agreement as follows:

1. Capitalized terms used in this Amendment and not otherwise defined herein shall have the same meanings set forth in the Agreement.

2. The Parties agree that Section 4.4 of the Agreement shall be hereby amended as follows, with any added or changed language indicated by double underlining:

4.4 Quarterly Reports. Within 30 days after the beginning of each Calendar Quarter beginning with the Calendar Quarter in which the First Commercial Sale following receipt of Regulatory Approval occurred, Astellas will deliver to Ironwood a report setting forth for the previous Calendar Quarter the following information on a Product-by-Product basis: (a) the gross sales and Net Sales of each Product in the Territory, (b) the number of units sold by Astellas, its Affiliates or Sublicensees and provided as samples without charge to any Third Party, (c) the basis for any adjustments to the royalty payable for the sale of each Product, (d) the royalty due hereunder for the sales of each Product, and (e) the applicable exchange rate as determined in accordance with this Agreement (the “Quarterly Report”).In addition, Astellas will also use commercially reasonable efforts to provide Ironwood with a preliminary report with Astellas’ good faith estimate of items (a)-(e) listed in the foregoing sentence no later than the 6th Business Day following the end of a Calendar Quarter. Notwithstanding the foregoing, Astellas has no obligation to provide such preliminary report, provided that Astellas provides the Quarterly Report within the 6th Business Day following the end of the Calendar Quarter. The total royalty due for the sale of Products during such Calendar Quarter will be remitted within 30 days after the end of such Calendar Quarter.

3. Save as herein provided all other terms and conditions of the Agreement shall remain in full force and effect. To the extent that there are any inconsistencies or conflicts between the terms of this Amendment and the Agreement, the terms of this Amendment shall prevail.

4. This Amendment shall become valid and binding upon its signing and shall continue to be in effect during the Term of the Agreement.

5. This Amendment may be executed in any number of counterparts, each of which will be deemed an original and all of which taken together will be deemed to constitute one and the same instrument. An executed signature page of this Amendment delivered by facsimile or other electronic transmission will be as effective as an original executed signature.

[The remainder of this page intentionally left blank.]

IN WITNESS WHEREOF, the Parties hereto have caused this Amendment to be executed by signature in duplicate and keep one original each.

Ironwood Pharmaceuticals, Inc.

/s/ Gina Consylman

Name: Gina Consylman

Title: Senior Vice President, Chief Financial Officer

Astellas Pharma Inc.

/s/ Ken Kubota

Name: Ken Kubota

Title: SVP Business Development

[Signature Page to Amendment to A&R License Agreement re: Quarterly Reports]

EX-23.1

EXHIBIT 23.1

CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM

We consent to the incorporation by reference in the following Registration Statements:

(1) Registration Statements (Form S-3 Nos. 333-179430, 333-199885, 333-221294, and 333-249896);

(2) Registration Statement (Form S-8 No. 333-231887) pertaining to the 2019 Equity Incentive Plan of Ironwood Pharmaceuticals, Inc.;

(3) Registration Statements (Form S-8 Nos. 333-189340, 333-197875, 333-206228, 333-213001, 333-219670, 333-226613, and 333-231890) pertaining to the Amended and Restated 2010 Employee Stock Purchase Plan of Ironwood Pharmaceuticals, Inc.;

(4) Registration Statements (Form S-8 Nos. 333-184396, 333-189339, 333-197874, 333-206227, 333-213002, 333-219669, and 333-226612) pertaining to the Amended and Restated 2010 Employee, Director and Consultant Equity Incentive Plan of Ironwood Pharmaceuticals, Inc.;

(5) Registration Statement (Form S-8 No. 333-165230) pertaining to the 2010 Employee Stock Purchase Plan of Ironwood Pharmaceuticals, Inc.;

(6) Registration Statement (Form S-8 No. 333-165231) pertaining to the 2010 Employee, Director and Consultant Equity Incentive Plan of Ironwood Pharmaceuticals, Inc.;

(7) Registration Statement (Form S-8 No. 333-165228) pertaining to the Amended and Restated 2005 Stock Incentive Plan of Ironwood Pharmaceuticals, Inc.;

(8) Registration Statement (Form S-8 No. 333-165229) pertaining to the Amended and Restated 2002 Stock Incentive Plan of Ironwood Pharmaceuticals, Inc.; and

(9) Registration Statement (Form S-8 No. 333-165227) pertaining to the 1998 Amended and Restated Stock Option Plan of Ironwood Pharmaceuticals, Inc.;

of our reports dated February 17, 2021, with respect to the consolidated financial statements of Ironwood Pharmaceuticals, Inc. and the effectiveness of internal control over financial reporting of Ironwood Pharmaceuticals, Inc. included in this Annual Report (Form 10-K) of Ironwood Pharmaceuticals, Inc. for the year ended December 31, 2020.

/s/ Ernst & Young LLP

Boston, Massachusetts

February 17, 2021

EX-31.1

EXHIBIT 31.1

CERTIFICATION PURSUANT

TO RULE 13a-14(a) UNDER

THE SECURITIES EXCHANGE ACT OF 1934

I, Mark Mallon, certify that:

1. I have reviewed this Annual Report on Form 10-K of Ironwood Pharmaceuticals, Inc. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 17, 2021

/s/ Mark Mallon

Mark Mallon

Chief Executive Officer

EX-31.2

EXHIBIT 31.2

CERTIFICATION PURSUANT

TO RULE 13a-14(a) UNDER

THE SECURITIES EXCHANGE ACT OF 1934

I, Gina Consylman, certify that:

1. I have reviewed this Annual Report on Form 10-K of Ironwood Pharmaceuticals, Inc. (the “registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date: February 17, 2021

/s/ GINA CONSYLMAN

Gina Consylman

Chief Financial Officer

EX-32.1

EXHIBIT 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Ironwood Pharmaceuticals, Inc. (the “Company”) on Form 10-K for the period ended December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Mark Mallon, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to my knowledge that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ Mark Mallon

Mark Mallon

Chief Executive Officer

February 17, 2021

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

EXHIBIT 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Annual Report of Ironwood Pharmaceuticals, Inc. (the “Company”) on Form 10-K for the period ended December 31, 2020 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Gina Consylman, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, to my knowledge that:

(1) The Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

/s/ GINA CONSYLMAN

Gina Consylman

Chief Financial Officer

February 17, 2021

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

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Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2020	Feb. 10, 2021	Jun. 30, 2020
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2020
Document Transition Report	false
Entity File Number	001-34620
Entity Registrant Name	IRONWOOD PHARMACEUTICALS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	04-3404176
Entity Address, Address Line One	100 Summer Street
Entity Address, Address Line Two	Suite 2300
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02110
City Area Code	617
Local Phone Number	621-7722
Title of 12(b) Security	Class A Common Stock, $0.001 par value
Entity Listing, Par Value Per Share	$ 0.001
Trading Symbol	IRWD
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
ICFR Auditor Attestation Flag	true
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Public Float			$ 1,634,804,172
Entity Common Stock, Shares Outstanding		160,962,175
Entity Central Index Key	0001446847
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	FY
Amendment Flag	false

XML

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 362,564	$ 177,023
Accounts receivable, net	122,351	11,279
Related party accounts receivable, net		105,967
Inventory, net		648
Prepaid expenses and other current assets	9,189	10,685
Restricted cash	1,735	1,250
Total current assets	495,839	306,852
Restricted cash, net of current portion	485	971
Accounts receivable, net of current portion	23,401	32,597
Property and equipment, net	8,929	12,429
Operating lease right-of-use assets	16,576	17,743
Convertible note hedges	13,065	31,366
Other assets	943	790
Total assets	559,238	402,748
Current liabilities:
Accounts payable	661	3,978
Related party accounts payable, net		1,509
Accrued research and development costs	1,898	2,956
Accrued expenses and other current liabilities	26,486	30,465
Current portion of operating lease liabilities	3,128	1,146
Deferred revenue		875
Total current liabilities	32,173	40,929
Note hedge warrants	12,088	24,260
Convertible senior notes	430,256	407,994
Operating lease obligations, net of current portion	20,318	22,082
Other liabilities	1,763	734
Commitments and contingencies
Stockholders' equity (deficit):
Preferred stock, $0.001 par value, 75,000,000 shares authorized, no shares issued and outstanding
Class A Common Stock, $0.001 par value, 500,000,000 shares authorized and 160,616,675 issued and outstanding at December 31, 2020 and 500,000,000 shares authorized and 157,535,962 shares issued and outstanding at December 31, 2019	161	158
Additional paid-in capital	1,528,535	1,478,823
Accumulated deficit	(1,466,056)	(1,572,232)
Total stockholders' equity (deficit)	62,640	(93,251)
Total liabilities and stockholders' equity (deficit)	$ 559,238	$ 402,748

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Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2020	Dec. 31, 2019
Preferred stock
Preferred stock, par value (in dollars per share)	$ 0.001	$ 0.001
Preferred stock, shares authorized	75,000,000	75,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock
Common stock, par value (in dollars per share)	$ 0.001	$ 0.001
Common stock, shares authorized	500,000,000	500,000,000
Common stock, shares issued	160,616,675	157,535,962
Common stock, shares outstanding	160,616,675	157,535,962

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Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Total revenues	$ 389,523	$ 428,413	$ 346,639
Cost and expenses:
Cost of revenues, excluding amortization of acquired intangible assets	3,136	23,875	32,751
Write-down of commercial supply and inventory to net realizable value and (settlement) loss on non-cancellable purchase commitments		(3,530)	247
Research and development	88,062	115,044	101,060
Selling, general and administrative	140,003	172,450	219,676
Amortization of acquired intangible assets			8,111
Gain on fair value remeasurement of contingent consideration			(31,045)
Gain on lease modification		(3,169)
Restructuring expenses	15,382	3,620	14,715
Impairment of intangible assets			151,794
Total cost and expenses	246,583	308,290	497,309
Income (loss) from operations	142,940	120,123	(150,670)
Other (expense) income:
Interest expense	(29,478)	(36,602)	(37,724)
Interest and investment income	1,504	2,862	2,991
Gain (loss) on derivatives	(6,129)	3,023	(8,743)
Loss on extinguishment of debt		(30,977)
Other income	24	514
Other expense, net	(34,079)	(61,180)	(43,476)
Income (loss) from continuing operations, before income taxes	108,861	58,943	(194,146)
Income tax expense	2,685	0	0
Income (loss) from continuing operations	106,176	58,943	(194,146)
Loss from discontinued operations, net of income taxes		(37,438)	(88,222)
Net income (loss)	106,176	21,505	(282,368)
Comprehensive income (loss)	$ 106,176	$ 21,505	$ (282,289)
Income (loss) per share from continuing operations, net of income taxes - basic (in dollars per share)	$ 0.67	$ 0.38	$ (1.27)
Income (loss) per share from continuing operations, net of income taxes - diluted (in dollars per share)	0.66	0.38	(1.27)
Loss per share from discontinued operations, net of income taxes - basic and diluted (in dollars per share)		(0.24)	(0.58)
Net income (loss) per share - basic (in dollars per share)	0.67	0.14	(1.85)
Net income (loss) per share - diluted (in dollars per share)	$ 0.66	$ 0.14	$ (1.85)
Weighted average shares used in computing net income per share - basic: (in shares)	159,427	156,023	152,634
Weighted average shares used in computing net income per share - diluted: (in shares)	160,655	156,023	152,634
Collaborative arrangements revenue
Revenues:
Total revenues	$ 381,545	$ 379,652	$ 272,839
Product revenue, net
Revenues:
Total revenues			3,445
Sale of active pharmaceutical ingredient
Revenues:
Total revenues	$ 7,978	$ 48,761	$ 70,355

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Consolidated Statements of Comprehensive Income (Loss) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Condensed Consolidated Statements of Comprehensive Income (Loss)
Net income (loss)	$ (282,368)
Other comprehensive income:
Unrealized gains on available-for-sale securities	79
Total other comprehensive income	79
Comprehensive income (loss)	$ (282,289)

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Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Class A common stock Common Stock	Class B common stock Common Stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive income (loss)	Total
Balance at Dec. 31, 2017	$ 137	$ 14	$ 1,318,536	$ (1,308,760)	$ (79)	$ 9,848
Balance (in shares) at Dec. 31, 2017	136,465,526	13,983,762
Increase (Decrease) in Stockholders' Equity
Issuance of common stock related to share-based awards and employee stock purchase plan	$ 3		32,058			32,061
Issuance of common stock related to share-based awards and employee stock purchase plan (in shares)	3,201,042	764,361
Issuance of common stock upon exercise of stock options and employee stock purchase plan, net of cancellations	$ 4		13,597			13,601
Issuance of common stock upon exercise of stock options and employee stock purchase plan, net of cancellations (in shares)	3,121,271
Conversion of Class B common stock to Class A common stock	$ 14	$ (14)
Conversion of Class B common stock to Class A common stock (in shares)	14,748,123	(14,748,123)
Share-based compensation expense related to share-based awards and employee stock purchase plan			44,009			44,009
Unrealized gains (losses) on available-for-sale securities					$ 79	79
Net income (loss)				(282,368)		(282,368)
Balance at Dec. 31, 2018	$ 154		1,394,603	(1,591,128)		(196,371)
Balance (in shares) at Dec. 31, 2018	154,414,691
Increase (Decrease) in Stockholders' Equity
Share-based compensation expense related to share-based awards and employee stock purchase plan			32,331			32,331
Equity component of convertible senior notes			92,502			92,502
Equity component of issuance costs for convertible senior notes			(2,092)			(2,092)
Purchase of capped calls			(25,159)			(25,159)
Equity component of the partial repurchase of the 2022 Convertible Notes			(26,959)			(26,959)
Dividend of sGC business				(2,609)		(2,609)
Net income (loss)				21,505		21,505
Balance at Dec. 31, 2019	$ 158		1,478,823	(1,572,232)		$ (93,251)
Balance (in shares) at Dec. 31, 2019	157,535,962					157,535,962
Increase (Decrease) in Stockholders' Equity
Issuance of common stock upon exercise of stock options and employee stock purchase plan	$ 3		18,537			$ 18,540
Issuance of common stock upon exercise of stock options and employee stock purchase plan (in shares)	3,080,713
Share-based compensation expense related to share-based awards and employee stock purchase plan			31,175			31,175
Net income (loss)				106,176		106,176
Balance at Dec. 31, 2020	$ 161		$ 1,528,535	$ (1,466,056)		$ 62,640
Balance (in shares) at Dec. 31, 2020	160,616,675					160,616,675

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Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Cash flows from operating activities:
Net income (loss)	$ 106,176	$ 21,505	$ (282,368)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Depreciation and amortization	3,564	5,580	3,859
Amortization of acquired intangible assets			8,111
Impairment of intangible assets			151,794
Loss on disposal of property and equipment	470	146	(1,867)
Share-based compensation expense	31,175	31,278	40,526
Gain on lease modification		(3,169)
Change in fair value of note hedge warrants	(12,172)	16,232	(58,425)
Change in fair value of convertible note hedges	18,301	(19,255)	67,168
Write-down of commercial supply and inventory to net realizable value and settlement loss on non-cancellable purchase commitments		(3,530)	219
Write-down of excess non-cancellable ZURAMPIC and DUZALLO sample purchase commitments			390
Accretion of discount/premium on investment securities			(165)
Loss on extinguishment of debt		30,977
Non-cash interest expense	22,263	19,590	17,601
Non-cash change in fair value of contingent consideration			(31,045)
Changes in assets and liabilities:
Accounts receivable and related party accounts receivable, net	4,091	(68,893)	1,207
Inventory, net	648		(806)
Prepaid expenses and other current assets	1,515	(1,046)	(3,727)
Other assets	(153)	159	702
Accounts payable, related party accounts payable and accrued expenses	(7,523)	(32,700)	2,678
Accrued research and development costs	(1,058)	(483)	542
Operating lease right-of-use assets	1,167	14,141
Operating lease liabilities	218	(12,046)
Deferred revenue	(875)	875
Deferred rent			916
Other liabilities	1,029
Net cash provided by (used in) continuing operating activities	168,836	(639)	(82,690)
Net cash provided by discontinued operating activities		11,364	11,808
Net cash provided by (used in) operating activities	168,836	10,725	(70,882)
Cash flows from investing activities:
Purchases of available-for-sale securities			(3,241)
Sales and maturities of available-for-sale securities			99,165
Purchases of property and equipment	(1,842)	(7,189)	(351)
Proceeds from sale of property and equipment		268	1,563
Net cash used in continuing investing activities	(1,842)	(6,921)	97,136
Net cash used in discontinued investing activities		(4,223)	(8,270)
Net cash used in investing activities	(1,842)	(11,144)	88,866
Cash flows from financing activities:
Proceeds from issuance of convertible senior notes		400,000
Purchase of capped calls		(25,159)
Proceeds from partial termination of convertible note hedges and note hedge warrants		3,174
Costs associated with issuance of convertible senior notes		(9,048)
Proceeds from exercise of stock options and employee stock purchase plan	18,546	13,595	32,061
Payments on capital lease obligations			(1,824)
Payments for partial repurchase of 2022 Convertible Notes		(227,338)
Payments on 8.375% Notes due 2026		(156,409)
Payments on contingent purchase price consideration			(165)
Net cash provided by (used in) continuing financing activities	18,546	(1,185)	30,072
Net cash provided by (used in) financing activities	18,546	(1,185)	30,072
Net increase (decrease) in cash, cash equivalents and restricted cash	185,540	(1,604)	48,056
Cash, cash equivalents and restricted cash, beginning of period	179,244	180,848	132,792
Cash, cash equivalents and restricted cash, end of period	364,784	179,244	180,848
Supplemental cash flow disclosure:
Cash paid for interest	7,216	17,584	18,235
Cash paid for income taxes	1,848
Non-cash investing and financing activities
Purchases under capital leases			664
Extinguishment of capital leases			2,687
Recognition of asset retirement obligation		486
Fixed asset purchases in accounts payable and accrued expenses		$ 1,282	$ 439
Cash paid for income taxes	$ 1,848

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Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of cash, cash equivalents, and restricted cash to the condensed consolidated balance sheets
Cash and cash equivalents	$ 362,564	$ 177,023	$ 173,172
Restricted cash	2,220	2,221	7,676
Total cash, cash equivalents, and restricted cash	$ 364,784	$ 179,244	$ 180,848	$ 132,792

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Nature of Business

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Nature of Business

1. Nature of Business

Ironwood Pharmaceuticals, Inc. (“Ironwood” or the “Company”) is a gastrointestinal (“GI”) healthcare company dedicated to advancing the treatment of GI diseases and redefining the standard of care for GI patients. The Company is focused on the development and commercialization of innovative GI product opportunities in areas of significant unmet need, leveraging its demonstrated expertise and capabilities in GI diseases.

LINZESS^® (linaclotide), the Company’s commercial product, is the first product approved by the United States Food and Drug Administration (the “U.S. FDA”) in a class of GI medicines called guanylate cyclase type C agonists and is indicated for adult men and women suffering from irritable bowel syndrome with constipation (“IBS-C”) or chronic idiopathic constipation (“CIC”). LINZESS is available to adult men and women suffering from IBS-C or CIC in the United States (the “U.S.”) and Mexico and to adult men and women suffering from IBS-C in Japan and China. Linaclotide is available under the trademarked name CONSTELLA^® to adult men and women suffering from IBS-C or CIC in Canada and to adult men and women suffering from IBS-C in certain European countries.

The Company has strategic partnerships with leading pharmaceutical companies to support the development and commercialization of linaclotide throughout the world. The Company and its partner, AbbVie Inc. (together with its affiliates, “AbbVie”) (successor to Allergan plc (together with its affiliates), “Allergan”), began commercializing LINZESS in the U.S. in December 2012. Under the Company’s collaboration with AbbVie for North America, total net sales of LINZESS in the U.S., as recorded by AbbVie, are reduced by commercial costs incurred by each party, and the resulting amount is shared equally between the Company and AbbVie. AbbVie also has an exclusive license from the Company to develop and commercialize linaclotide in all countries other than China (including Hong Kong and Macau), Japan and the countries and territories of North America (the “AbbVie License Territory”). On a country-by-country and product-by-product basis in the AbbVie License Territory, AbbVie pays the Company a royalty as a percentage of net sales of products containing linaclotide as an active ingredient. In addition, AbbVie has exclusive rights to commercialize linaclotide in Canada as CONSTELLA and in Mexico as LINZESS.

Astellas Pharma Inc. (“Astellas”), the Company’s partner in Japan, has an exclusive license to develop and commercialize linaclotide in Japan. In March 2017, Astellas began commercializing LINZESS for the treatment of adults with IBS-C in Japan, and in September 2018, Astellas began commercializing LINZESS for the treatment of adults with chronic constipation in Japan. In August 2019, the Company amended and restated its license agreement with Astellas. Effective in 2020, Company is no longer responsible for the supply of linaclotide active pharmaceutical ingredient (“API”) to Astellas (Note 6).

In October 2012, the Company and AstraZeneca AB (together with its affiliates) (“AstraZeneca”) entered into a collaboration agreement to co-develop and co-commercialize linaclotide in China (including Hong Kong and Macau) (the “AstraZeneca License Territory”). In September 2019, the Company amended and restated its existing collaboration agreement with AstraZeneca whereby AstraZeneca obtained the exclusive right to develop, manufacture, and commercialize products containing linaclotide in the AstraZeneca License Territory (Note 6). In November 2019, AstraZeneca began commercializing LINZESS for the treatment of adults with IBS-C in China.

The Company and AbbVie are exploring ways to enhance the clinical profile of LINZESS by studying linaclotide in additional indications, populations and formulations to assess its potential to treat various conditions. In September 2020, based on the Phase IIIb data demonstrating efficacy and safety of LINZESS 290 mcg on the overall abdominal symptoms of bloating, pain and discomfort in adult patients with IBS-C, the U.S. FDA approved the Company’s Supplemental New Drug Application to include a more comprehensive description of the effects of LINZESS in its approved label. In June 2020 and July 2020, the United States Patent and Trademark Office granted patents covering the formulation of the 72 mcg dose of LINZESS and methods of using the formulation, respectively. The patents are expected to expire in 2031.

The Company and AbbVie were developing MD-7246, a delayed release formulation of linaclotide. In May 2020, the Company and AbbVie announced top-line data from a Phase II trial evaluating MD-7246 in adult patients with

abdominal pain associated with irritable bowel syndrome with diarrhea. The Phase II trial did not meet its primary or key secondary endpoints. Based on these findings, the Company and AbbVie discontinued the development of MD-7246.

The Company was developing IW-3718, a gastric retentive formulation of a bile acid sequestrant, in a Phase III program. In September 2020, the Company announced that one of its two identical Phase III trials for the potential treatment of refractory gastroesophageal reflux disease (“refractory GERD”) did not meet the pre-specified criteria associated with a planned early efficacy assessment. Based on these findings, the Company is discontinuing development of IW-3718. In connection with this decision, the Company reduced its workforce by approximately 100 full-time employees. This workforce reduction affected both field-based and home-office employees, including the relevant general and administrative support functions. The Company substantially completed the reduction in its workforce in the fourth quarter of 2020 (Note 18).

Additionally, the Company periodically enters into co-promotion agreements to bolster its salesforce productivity. In August 2019, the Company entered into a disease education and promotional agreement with Alnylam Pharmaceuticals, Inc. (“Alnylam”) for Alnylam’s GIVLAARI^® (givosiran) for the treatment of acute hepatic porphyria (“AHP”). Under the agreement, the Company performs disease awareness activities related to AHP and sales detailing activities of GIVLAARI.

These and other agreements are more fully described in Note 6, Collaboration, License, Co-Promotion and Other Commercial Agreements, to these consolidated financial statements.

On April 1, 2019, Ironwood completed the separation (the “Separation”) of its soluble guanylate cyclase (“sGC”) business, and certain other assets and liabilities, into Cyclerion Therapeutics, Inc (“Cyclerion”). The Separation was effected by means of a distribution of all of the outstanding shares of common stock, with no par value, of Cyclerion through a dividend of all outstanding shares of Cyclerion’s common stock, to Ironwood’s stockholders of record as of the close of business on March 19, 2019 (Note 3).

The Company was incorporated in Delaware on January 5, 1998 as Microbia, Inc. On April 7, 2008, the Company changed its name to Ironwood Pharmaceuticals, Inc. To date, the Company has dedicated a majority of its activities to the research, development and commercialization of linaclotide, as well as to the research and development of its other product candidates. Prior to the year ended December 31, 2019, the Company incurred net losses in each year since its inception in 1998. For the years ended December 31, 2020 and 2019, the Company recorded net income of approximately $106.2 million and approximately $21.5 million, respectively. As of December 31, 2020, the Company had an accumulated deficit of approximately $1.5 billion.

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Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Ironwood and its wholly-owned subsidiaries, as of December 31, 2020, Ironwood Pharmaceuticals Securities Corporation and Ironwood Pharmaceuticals GmbH. Cyclerion was a wholly-owned subsidiary until it became an independent publicly-traded company on April 1, 2019. All intercompany transactions and balances are eliminated in consolidation.

Segment Information

Operating segments are components of an enterprise for which separate financial information is available and is evaluated regularly by the Company’s chief operating decision-maker in deciding how to allocate resources and in assessing performance. The Company currently operates in one reportable business segment—human therapeutics.

Reclassifications

Certain prior period financial statement items have been reclassified to conform to current period presentation.

Discontinued Operations

The Company determined that its sGC business, which was disposed on April 1, 2019, met the criteria for classification as a discontinued operation in accordance with Accounting Standards Codification (“ASC”) Subtopic 205-20, Discontinued Operations (“ASC 205-20”). Accordingly, the accompanying consolidated financial statements as of and for the year ended December 31, 2019 and all prior periods present the balance sheet, operations, and cash flows associated with the sGC business as discontinued operations. For additional information related to discontinued operations, refer to Note 3, Cyclerion Separation, to these consolidated financial statements.

Use of Estimates

The preparation of consolidated financial statements in accordance with U.S. generally accepted accounting principles requires the Company’s management to make estimates and judgments that may affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the amounts of revenues and expenses during the reported periods. On an ongoing basis, the Company’s management evaluates its estimates, judgments and methodologies. Significant estimates and assumptions in the consolidated financial statements include those related to revenue recognition; accounts receivable; inventory valuation and related reserves; useful lives of long-lived assets, impairment of long-lived assets, including its acquired intangible assets and goodwill; valuation procedures for right-of-use assets and operating lease liabilities; valuation procedures for the issuance and repurchase of convertible notes; balance sheet classification of convertible notes; valuation of assets and liabilities held for disposition and losses related to discontinued operations; fair value of derivatives; income taxes, including the valuation allowance for deferred tax assets; research and development expenses; contingencies and share-based compensation. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ materially from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

Cash and Cash Equivalents

The Company considers all highly liquid investment instruments with a remaining maturity when purchased of three months or less to be cash equivalents. Investments qualifying as cash equivalents primarily consist of money market funds, U.S. government-sponsored securities, and repurchase agreements. The carrying amount of cash equivalents approximates fair value. The amount of cash equivalents included in cash and cash equivalents was approximately $349.0 million and approximately $177.0 million at December 31, 2020 and 2019, respectively.

Restricted Cash

The Company is contingently liable under unused letters of credit with a bank, related to the Company’s facility lease and vehicle lease agreements, in the amount of approximately $2.2 million as of December 31, 2020 and 2019. The Company records as restricted cash the collateral used to secure these letters of credit. The amount of restricted cash included in current assets and non-current assets was approximately $1.7 million and $0.5 million at December 31, 2020, respectively. The amount of restricted cash in current assets and non-current assets was approximately $1.2 million and $1.0 million at December 31, 2019, respectively.

Concentrations of Suppliers

The Company relies on its collaboration partners and their suppliers to manufacture linaclotide API, linaclotide finished drug product, and finished goods.

If any of the Company’s collaboration partners and their suppliers were to limit or terminate production or otherwise fail to meet the quality or delivery requirements needed to satisfy the supply commitments, the process of locating and qualifying alternate sources could require up to several months, during which time production could be

delayed. Such delays could have a material adverse effect on the Company’s business, financial position and results of operations.

Accounts Receivable and Related Valuation Account

The Company makes judgments as to its ability to collect outstanding receivables and provides an allowance for credit losses when collection becomes doubtful. Provisions are made based upon a specific review of all significant outstanding invoices and the overall quality and age of those invoices not specifically reviewed. The Company’s receivables relate primarily to amounts reimbursed under its collaboration, license and co-promotion agreements. The Company believes that credit risks associated with these partners are not significant. The Company reviews the need for an allowance for credit losses for its receivables based on various factors including payment history and historical bad debt experience. The Company had no allowance for credit losses as of December 31, 2020 or 2019.

Concentrations of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents, restricted cash, and accounts receivable. The Company maintains its cash and cash equivalent balances with high-quality financial institutions and the Company believes that such funds are subject to minimal credit risk. The Company has adopted an investment policy which limits the amounts the Company may invest in certain types of investments, and requires all investments held by the Company to be at least AA- rated, thereby reducing credit risk exposure.

Accounts receivable primarily consist of amounts due under the linaclotide collaboration agreement with AbbVie for North America (Note 6). The Company does not obtain collateral for its accounts receivable. The Company previously reflected amounts due from Allergan, net of amounts payable to Allergan, prior to its acquisition by AbbVie as related party accounts receivable, net. Following the acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company (Note 17).

The percentages of revenue recognized from significant collaborative partners of the Company in the years ended December 31, 2020, 2019 and 2018 as well as the account receivable balances, net of any payables due, at December 31, 2020 and 2019 are included in the following table:

	Accounts Receivable				Revenue
	December 31,				Year Ended December 31,
	2020		2019		2020		2019		2018
Collaborative Partner:
AbbVie (North America and Europe)	76	%	90	%	96	%	78	%	77	%
Astellas (Japan)	1	%	8	%	1	%	13	%	20	%

For the years ended December 31, 2020, 2019 and 2018, no additional customers accounted for more than 10% of the Company’s revenue.

Property and Equipment

Property and equipment, including leasehold improvements, are recorded at cost, and are depreciated when placed into service using the straight-line method based on their estimated useful lives as follows:

	Estimated Useful Life
Asset Description	(In Years)
Laboratory equipment	5
Computer and office equipment	3
Furniture and fixtures	7
Software	3

Included in property and equipment are certain costs of software obtained for internal use. Costs incurred during the preliminary project stage are expensed as incurred, while costs incurred during the application development stage are capitalized and amortized over the estimated useful life of the software. The Company also capitalizes costs

related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Maintenance and training costs related to software obtained for internal use are expensed as incurred.

Leasehold improvements are amortized over the shorter of the estimated useful life of the asset or the lease term.

Costs for capital assets not yet placed into service have been capitalized as construction in process, and will be depreciated in accordance with the above guidelines once placed into service. Maintenance and repair costs are expensed as incurred.

Finite Lived Intangible Assets

The Company records the fair value of purchased intangible assets with finite useful lives as of the transaction date of a business combination. Purchased intangible assets with finite useful lives are amortized to their estimated residual values over their estimated useful lives. The value of the Company’s finite-lived intangible assets was based on the future expected net cash flows related to ZURAMPIC and DUZALLO (the “Lesinurad Products”), which included significant assumptions around future net sales and the respective investment to support these products. During the year ended December 31, 2018, the Company recorded an impairment charge of approximately $151.8 million to fully write-off its ZURAMPIC and DUZALLO intangible assets.

Impairment of Long-Lived Assets

The Company regularly reviews the carrying amount of its long-lived assets to determine whether indicators of impairment may exist, which warrant adjustments to carrying values or estimated useful lives. If indications of impairment exist, projected future undiscounted cash flows associated with the asset are compared to the carrying amount to determine whether the asset’s value is recoverable. If the carrying value of the asset exceeds such projected undiscounted cash flows, the asset will be written down to its estimated fair value.

Income Taxes

The Company provides for income taxes under the asset and liability method. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates in effect when the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance to reflect the uncertainty associated with their ultimate realization.

The Company accounts for uncertain tax positions recognized in the consolidated financial statements in accordance with the provisions of ASC Topic 740, Income Taxes, by prescribing a more-likely-than-not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. When uncertain tax positions exist, the Company recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. The determination as to whether the tax benefit will more likely than not be realized is based upon the technical merits of the tax position as well as consideration of the available facts and circumstances. The Company evaluates uncertain tax positions on a quarterly basis and adjusts the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions. Any changes to these estimates, based on the actual results obtained and/or a change in assumptions, could impact the Company’s income tax provision in future periods. Interest and penalty charges, if any, related to unrecognized tax benefits would be classified as a provision for income tax in the Company’s consolidated statement of operations.

Financing Costs

Financing costs include costs directly attributable to the Company’s offerings of its equity securities and its debt financings. Costs attributable to equity offerings are charged as a reduction to stockholders’ equity against the proceeds of the offering once the offering is completed. Costs attributable to debt financings are deferred and amortized to interest expense over the term of the debt using the effective interest method. Costs incurred in connection with convertible debt securities are allocated between the liability and equity components. In accordance with ASC 835, Interest, the Company presents debt issuance costs on the balance sheet as a direct deduction from the associated debt liability.

Leases

Effective January 1, 2019, the Company adopted ASC Topic 842, Leases (“ASC 842”), using the optional transition method. The adoption of ASC 842 represented a change in accounting principle that aimed to increase transparency and comparability among organizations by requiring the recognition of right-of-use assets and lease liabilities on the balance sheet for both operating and finance leases. In addition, the standard required enhanced disclosures that meet the objective of enabling financial statement users to assess the amount, timing, and uncertainty of cash flows arising from leases.

As part of the ASC 842 adoption, the Company elected certain practical expedients, which include:

● Accounting policy election to use the short-term lease exception by asset class; and

● Election of the practical expedient package during transition, which includes:

o An entity need not reassess whether any expired or existing contracts are or contain leases.

o An entity need not reassess the classification for any expired or existing leases. As a result, all leases that were classified as operating leases in accordance with ASC 840 are classified as operating leases under ASC 842, and all leases that were classified as capital leases in accordance with ASC 840 are classified as finance leases under ASC 842.

o An entity need not reassess initial direct costs for any existing leases.

Subsequent to the Company’s adoption of ASC 842, the Company elected the post-transition practical expedient, by class of underlying asset, to account for lease components and non-lease components together as a single component for the asset class of operating lease right-of-use real estate assets.

The Company’s lease portfolio for the year ended December 31, 2020 included: a lease for its headquarters location, a data center colocation lease, vehicle leases for its salesforce representatives, and leases for computer and office equipment. The Company determines if an arrangement is a lease at the inception of the contract. The asset component of the Company’s operating leases is recorded as operating lease right-of-use assets, and the liability component is recorded as current portion of operating lease liabilities and operating lease liabilities, net of current portion in the Company’s consolidated balance sheets. As of December 31, 2020, the Company did not record any finance leases.

Right-of-use assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the lease inception date. Existing leases in the Company’s lease portfolio as of the adoption date were valued as of January 1, 2019. The Company uses an incremental borrowing rate based on the information available at lease inception in determining the present value of lease payments, if an implicit rate of return is not provided with the lease contract. Operating lease right-of-use assets are adjusted for incentives expected to be received.

Right-of-use assets and operating lease liabilities are remeasured upon certain modifications to leases using the present value of remaining lease payments and estimated incremental borrowing rate upon lease modification.

Lease cost is recognized on a straight-line basis over the lease term, and includes amounts related to short-term leases. The Company recognizes variable lease payments as operating expenses in the period in which the obligation for those payments is incurred. Variable lease payments primarily include common area maintenance, utilities, real estate taxes, insurance, and other operating costs that are passed on from the lessor in proportion to the space leased by the Company.

Derivative Assets and Liabilities

In June 2015, the Company issued 2.25% Convertible Senior Notes due June 15, 2022 (the “2022 Convertible Notes”) and in August 2019, the Company issued 0.75% Convertible Senior Notes due 2024 (the “2024 Convertible Notes”) and 1.50% Convertible Senior Notes due 2026 (the “2026 Convertible Notes”) (together with the “2022 Convertible Notes” and the “2024 Convertible Notes”, the “Convertible Senior Notes”). In June 2015, in connection with the issuance of the 2022 Convertible Notes, the Company entered into convertible note hedge transactions (the “Convertible Note Hedges”). Concurrently with entering into the Convertible Note Hedges, the Company also entered into certain warrant transactions in which it sold note hedge warrants (the “Note Hedge Warrants”) to the Convertible

Note Hedge counterparties to acquire shares of the Company’s Class A Common Stock, subject to customary anti-dilution adjustments (Note 11). In connection with the partial repurchase of the 2022 Convertible Notes in August 2019, the Company terminated its Convertible Note Hedges and Note Hedge Warrants proportionately. These instruments are derivative financial instruments under ASC Topic 815, Derivatives and Hedging (“ASC 815”).

These derivatives are recorded as assets or liabilities at fair value each reporting date and the fair value is determined using the Black-Scholes option-pricing model. The changes in fair value are recorded as a component of other (expense) income in the consolidated statements of operations. Significant inputs used to determine the fair value include the price per share of the Company’s Class A Common Stock on the date of valuation, expected term of the derivative instruments, strike prices of the derivative instruments, risk-free interest rate, and expected volatility of the Company’s Class A Common Stock. Changes to these inputs could materially affect the valuation of the Convertible Note Hedges and Note Hedge Warrants in future periods.

In August 2019, in connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into the Capped Calls. The Capped Calls cover the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes (subject to anti-dilution and certain other adjustments). These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met.

Revenue Recognition

The Company’s revenues are generated primarily through collaborative arrangements and license agreements related to the research and development and commercialization of linaclotide, as well as co-promotion arrangements in the U.S. The terms of the collaborative research and development, license, co-promotion and other agreements contain multiple performance obligations which may include (i) licenses, (ii) research and development activities, including participation on joint steering committees, (iii) the manufacture of finished drug product, API, or development materials for a partner, which are reimbursed at a contractually determined rate, and (iv) education or co-promotion activities by the Company’s clinical sales specialists. Non-refundable payments to the Company under these agreements may include (i) up-front license fees, (ii) payments for research and development activities, (iii) payments for the manufacture of finished drug product, API, or development materials, (iv) payments based upon the achievement of certain milestones, (v) payments for sales detailing, promotional support services and medical education initiatives, and (vi) royalties on product sales. The Company receives its share of the net profits or bears its share of the net losses from the sale of linaclotide in the U.S. through its collaboration agreement with AbbVie for North America. The Company has adopted a policy to recognize revenue net of tax withholdings, as applicable.

Collaboration, License, Co-Promotion and Other Commercial Agreements

Upon licensing intellectual property to a customer, the Company determines if the license is distinct from the other performance obligations identified in the arrangement. The Company recognizes revenues from the transaction price, including non-refundable, up-front fees allocated to the license when the license is transferred to the customer if the license has distinct benefit to the customer. For licenses that are combined with other promises, the Company assesses the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time. For performance obligations that are satisfied over time, the Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

The Company’s license and collaboration agreements include milestone payments, such as development and other milestones. The Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method at the inception of the agreement. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within the control of the Company, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is then allocated to each performance obligation on a relative standalone selling price basis, for which the Company recognizes revenue as or when the performance obligations under the contract are satisfied. The Company re-evaluates the probability of achievement of such milestones and any related constraint at each reporting period, and any adjustments are recorded on a cumulative catch-up basis.

Agreements that include the supply of API or drug product for either clinical development or commercial supply at the customer’s discretion are generally considered as options. The Company assesses if these options provide a material right to its partner, and if so, they are accounted for as separate performance obligations. If the Company is entitled to additional payments when the customer exercises these options, any additional payments are recorded as revenue when the customer obtains control of the goods, which is typically upon shipment for sales of API and finished drug product.

For agreements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company recognizes revenue when the related sales occur.

Net Profit or Net Loss Sharing

In accordance with ASC 808 Topic, Collaborative Arrangements (“ASC 808”), the Company considers the nature and contractual terms of the arrangement and the nature of the Company’s business operations to determine the classification of payments under the Company’s collaboration agreements. While ASC 808 provides guidance on classification, the standard is silent on matters of separation, initial measurement, and recognition. Therefore, the Company applies the separation, initial measurement, and recognition principles of ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”), as applicable.

The Company’s collaborative arrangements revenues generated from sales of LINZESS in the U.S. are considered akin to sales-based royalties. In accordance with the sales-based royalty exception, the Company recognizes its share of the pre-tax commercial net profit or net loss generated from the sales of LINZESS in the U.S. in the period the product sales are earned, as reported by AbbVie, and related cost of goods sold and selling, general and administrative expenses as incurred by the Company and AbbVie. These amounts are partially determined based on amounts provided by AbbVie and involve the use of estimates and judgments, such as product sales allowances and accruals related to prompt payment discounts, chargebacks, governmental and contractual rebates, wholesaler fees, product returns, and co-payment assistance costs, which could be adjusted based on actual results in the future. The Company is highly dependent on AbbVie for timely and accurate information regarding net revenues from sales of LINZESS in the U.S. in accordance with both ASC 808 and ASC 606, and the related costs, in order to accurately report its results of operations. If the Company does not receive timely and accurate information or incorrectly estimates activity levels associated with the collaboration at a given point in time, the Company could be required to record adjustments in future periods.

In accordance with ASC 606-10-55, Principal Agent Considerations, the Company records revenue transactions as net product revenue in its consolidated statements of operations if it is deemed the principal in the transaction, which includes being the primary obligor, retaining inventory risk, and control over pricing. Given that the Company is not the primary obligor and does not have the inventory risks in the collaboration agreement with AbbVie for North America, it records its share of the net profits or net losses from the sales of LINZESS in the U.S. on a net basis and presents the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. The Company and AbbVie settle the cost sharing quarterly such that the Company’s statements of operations reflect 50% of the pre-tax net profit or loss generated from sales of LINZESS in the U.S.

Product Revenue, Net

Product revenue consisted of sales of the Lesinurad Products, in the U.S. until the termination of the exclusive license to develop, manufacture, and commercialize in the U.S. products containing lesinurad as an active ingredient (the “Lesinurad License”) in January 2019. The Company sold the Lesinurad Products principally to a limited number of national wholesalers and selected regional wholesalers (the “Distributors”). The Distributors resold the Lesinurad Products to retail pharmacies and healthcare providers, who then sold to patients.

Net product revenue was recognized when the Distributor obtained control of the Company’s product, which occurred at a point in time, typically upon shipment of Lesinurad Products to the Distributor. When the Company performed shipping and handling activities after the transfer of control to the Distributor (e.g., when control transfers prior to delivery), they were considered fulfillment activities, and accordingly, the costs were accrued for when the related revenue was recognized. The Company expensed incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that the Company would have recognized was one year or less.

The Company evaluated the creditworthiness of each of its Distributors to determine whether it was probable that a significant reversal in the amount of the cumulative revenue recognized would not occur. The Company calculated its net product revenue based on the wholesale acquisition cost that the Company charged its Distributors for the Lesinurad Products less variable consideration. The product revenue variable consideration consisted of estimates relating to (i) trade discounts and allowances, such as invoice discounts for prompt payment and distributor fees, (ii) estimated government and private payor rebates, chargebacks and discounts, such as Medicaid reimbursements, (iii) reserves for expected product returns and (iv) estimated costs of incentives offered to certain indirect customers including patients. These estimates would be adjusted based on actual results in the period such variances became known.

Product revenue was recorded net of the trade discounts, allowances, rebates, chargebacks, discounts, product returns, and other incentives. Certain of these adjustments were recorded as an accounts receivable reserve, while certain of these adjustments were recorded as accrued expenses.

Sale of Active Pharmaceutical Ingredient

During the years ended December 31, 2020, 2019, and 2018, the Company produced linaclotide API, finished drug product, finished goods, and/or development materials for certain of its partners. As of December 31, 2020, the Company is no longer responsible for the supply of linaclotide API, finished drug product, finished goods or development materials to its partners.

As it relates to development materials and API produced for Astellas, the Company was reimbursed at a contracted rate. Such reimbursements were considered as part of revenue generated pursuant to the Astellas license agreement and are presented as collaborative arrangements revenue. Any linaclotide API, finished drug product, finished goods, and development materials AbbVie is responsible for producing for the U.S. are recognized in accordance with the cost-sharing provisions of the collaboration agreement with AbbVie for North America. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, any linaclotide API, finished drug product, and development materials produced for AstraZeneca for China (including Hong Kong and Macau) were recognized in accordance with the cost-sharing provisions of the AstraZeneca collaboration agreement.

The Company recognized revenue on linaclotide API, finished drug product, finished goods, and development materials when control has transferred to the partner, which generally occurs upon shipment after the material passed all quality testing required for acceptance by the partner.

Other

The Company’s deferred revenue balance consists of advance billings and payments received from customers in excess of revenue recognized.

Cost of Revenues

Cost of revenues includes cost related to the sales of linaclotide API and finished drug product, as well as the cost of product revenue related to sales of the Lesinurad Products in the U.S. Cost related to the sales of linaclotide API, finished drug product, and finished goods are generally recognized upon shipment to certain of the Company’s partners outside of the U.S. The Company’s cost of revenues for linaclotide consists of the internal and external costs of producing such API and finished drug product. Cost of product revenue related to the sales of the Lesinurad Products in the U.S. includes the cost of producing finished goods that correspond with product revenue for the reporting period, such as third-party supply and overhead costs, as well as certain period costs related to freight, packaging, stability and quality testing, and customer acquisition.

Research and Development Costs

The Company generally expenses research and development costs to operations as incurred. The Company capitalizes nonrefundable advance payments made by the Company for research and development activities and defers expense recognition until the related goods are received or the related services are performed.

Research and development expenses are comprised of costs incurred in performing research and development activities, including salary, benefits, share-based compensation, and other employee-related expenses; laboratory supplies and other direct expenses; facilities expenses; overhead expenses; third-party contractual costs relating to nonclinical studies and clinical trial activities and related contract manufacturing expenses, development of manufacturing processes and regulatory registration of third-party manufacturing facilities; licensing fees for the Company’s product candidates; and other outside expenses.

The Company has certain collaboration agreements pursuant to which it shares or has shared research and development expenses related to linaclotide. The Company records expenses incurred under such linaclotide collaboration arrangements as research and development expense. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, under the Company’s collaboration agreement with AstraZeneca for China (including Hong Kong and Macau), the Company was reimbursed for certain research and development expenses and it netted these reimbursements against its research and development expenses as incurred. In connection with the execution of the Amended AstraZeneca Agreement, AstraZeneca is fully responsible for all research and development costs incurred related to the development, manufacture, and commercialization of linaclotide in China (including Hong Kong and Macau). Under the Company’s collaboration agreement with AbbVie for North America, the Company is reimbursed for certain research and development expenses and nets these reimbursements against its research and development expenses as incurred. Amounts owed to AbbVie or AstraZeneca under the Company’s respective collaboration agreements were recorded as incremental research and development expense.

Restructuring Expenses

Restructuring expenses are comprised primarily of costs associated with exit and disposal activities in accordance with ASC 420, Exit or Disposal Cost Obligations, and include one-time termination benefits and contract-related costs. Such costs are based on estimates of fair value in the period liabilities are incurred. The Company evaluates and adjusts these costs for changes in circumstances as additional information becomes available.

Selling, General and Administrative Expenses

The Company expenses selling, general and administrative costs to operations as incurred. Selling, general and administrative expenses consist primarily of compensation, benefits and other employee-related expenses for personnel in the Company’s administrative, finance, legal, information technology, business development, commercial, sales, marketing, communications and human resource functions. Other costs include the legal costs of pursuing patent protection of the Company’s intellectual property, general and administrative related facility costs, insurance costs and professional fees for accounting, tax, consulting, legal and other services.

Prior to the execution of the Amended AstraZeneca Agreement, the Company was reimbursed for certain selling, general and administrative expenses and the Company netted these reimbursements against the Company’s selling, general and administrative expenses as incurred. In connection with the Amended AstraZeneca Agreement, effective in September 2019, AstraZeneca will be fully responsible for all costs related to the development, manufacture, and commercialization of linaclotide in China (including Hong Kong and Macau). The Company includes AbbVie’s selling, general and administrative cost-sharing payments in the calculation of the net profits and net losses from the sale of LINZESS in the U.S. and presents the net payment to or from AbbVie as collaboration expense or collaborative arrangements revenue, respectively.

Share-Based Compensation Expense

The Company grants awards under its share-based compensation programs, including stock awards, restricted stock awards (“RSAs”), restricted stock units (“RSUs”) (including both time-based and performance-based RSUs), stock options, and shares issued under the Company’s employee stock purchase plan (“ESPP”). Share-based compensation is recognized as expense in the consolidated statements of operations based on the grant date fair value over the requisite service period, net of estimated forfeitures. The Company estimates forfeitures over the requisite service period using historical forfeiture activity and records share-based compensation expense only for those awards that are expected to vest.

The Company estimates the fair value of stock options using the Black-Scholes option-pricing model, which requires the use of subjective assumptions including volatility and expected term, among others. The fair value of stock

awards, RSAs, and RSUs is based on the market value of the Company’s Class A Common Stock on the date of grant, with the exception of performance-based RSUs with market conditions, which are measured using the Monte Carlo simulation method on the date of grant (Note 14). Discounted stock purchases under the Company’s ESPP are valued on the first date of the offering period using the Black-Scholes option-pricing model to compute the fair value of the lookback provision plus the purchase discount.

For awards that vest based on service conditions and market conditions, the Company uses a straight-line method to recognize compensation expense over the respective service period. For awards that contain performance conditions, the Company determines the appropriate amount to expense at each reporting date based on the anticipated achievement of performance targets, which requires judgement, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, the Company records a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, the Company re-assesses the estimated performance and updates the number of performance-based awards that it believes will ultimately vest. Discounted stock purchases under the Company’s ESPP are recognized over the offering period.

Compensation expense related to modified awards is measured based on the fair value for the awards as of the modification date. Any incremental compensation expense arising from the excess of the fair value of the awards on the modification date compared to the fair value of the awards immediately before the modification date is recognized at the modification date or ratably over the requisite remaining service period, as appropriate.

While the assumptions used to calculate and account for share-based compensation awards represent management’s best estimates, these estimates involve inherent uncertainties and the application of management’s judgment. As a result, if revisions are made to the Company’s underlying assumptions and estimates, the Company’s share-based compensation expense could vary significantly from period to period.

Patent Costs

The Company incurred and recorded as operating expense legal and other fees related to patents of approximately $2.3 million, approximately $7.8 million, and approximately $5.0 million for the years ended December 31, 2020, 2019 and 2018, respectively. These costs were charged to selling, general and administrative expenses as incurred.

Net Income (Loss) Per Share

Basic net income (loss) per common share is computed by dividing the net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed by dividing net income (loss) by the diluted number of shares outstanding during the period. Except where the result would be antidilutive to net income (loss), diluted net income (loss) per common share is computed assuming the conversion of the 2022 Convertible Notes, the 2024 Convertible Notes and the 2026 Convertible Notes, the exercise of outstanding common stock options and the vesting of RSUs and RSAs (using the treasury stock method), as well as their related income tax effects.

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions, and other events and circumstances from non-owner sources and consists of net income (loss) and changes in unrealized gains and losses on available-for-sale debt securities in the periods presented in the Company’s consolidated statements of comprehensive income (loss).

Subsequent Events

The Company considers events or transactions that have occurred after the balance sheet date of December 31, 2020, but prior to the filing of the financial statements with the Securities and Exchange Commission (“SEC”) to provide additional evidence relative to certain estimates or to identify matters that require additional recognition or disclosure. Subsequent events have been evaluated through the filing of the financial statements accompanying this Annual Report on Form 10-K.

New Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (the “FASB”) or other standard setting bodies that are adopted by the Company as of the specified effective date. Except as set forth below, the Company did not adopt any new accounting pronouncements during the year ended December 31, 2020 that had a material effect on its consolidated financial statements.

In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 changed how companies account for credit losses for most financial assets and certain other instruments. For trade receivables, loans and held-to-maturity debt securities, companies are required to recognize an allowance for credit losses rather than reducing the carrying value of the asset. Subsequent to the issuance of ASU 2016-13, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief (“ASU 2019-05”), ASU No. 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Date, ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, ASU No. 2020-02, Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) to provide additional guidance on the adoption of ASU 2016-13. Early adoption was permitted. The Company adopted these ASUs during the three months ended March 31, 2020. The adoption of these ASUs did not have a material impact on the Company’s financial position and results of operations.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350) (“ASU 2017-04”) to simplify the accounting for goodwill impairment by removing Step 2 of the goodwill impairment test and to eliminate the required quantitative analysis for reporting units with negative carrying value. ASU 2017-04 is effective for fiscal years beginning after December 15, 2019. Early adoption was permitted. The Company adopted ASU 2017-04 during the three months ended March 31, 2020. The adoption of ASU 2017-04 did not have a material impact on the Company’s financial position and results of operations.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework— Changes to the Disclosure Requirement for Fair Value Measurement (“ASU 2018-13”) which amends the disclosure requirements for fair value measurements. The amendments in ASU 2018-13 are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-13 during the three months ended March 31, 2020. The adoption of ASU 2018-13 did not have a material impact on the Company’s financial statement disclosures.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract (a consensus of the FASB Emerging Issues Task Force) (“ASU 2018-15”) which provides guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. ASU 2015-18 requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance to determine which implementation costs to capitalize as assets or expense as incurred. The internal-use software guidance requires that certain costs incurred during the application development stage be capitalized and other costs incurred during the preliminary project and post-implementation stages be expensed as they are incurred. A customer’s accounting for the hosting component of the arrangement is not affected by this guidance. The amendments in ASU 2018-15 are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-15 using the prospective transition method during the three months ended March 31, 2020. The adoption of ASU 2018-15 did not have a material impact on the Company’s financial position and results of operations.

In October 2018, the FASB issued ASU No. 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (“ASU 2018-17”). The update is intended to improve general purpose financial reporting by considering indirect interests held through related parties in common control arrangements on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. The amendments in ASU 2018-17 will be effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-17 during the three months ended

March 31, 2020. The adoption of ASU 2018-17 did not have a material impact on the Company’s financial position and results of operations.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”), which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company is currently evaluating the potential impact that the adoption of ASU 2019-12 may have on the Company’s financial position and results of operations.

In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). The amendments in ASU 2020-06 simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. Under ASU 2020-06, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. These changes will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that was bifurcated under previously existing guidance. The new guidance also requires the if-converted method to be applied for all convertible instruments. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. Early adoption is permitted. The Company is currently evaluating the impact that the adoption of ASU 2020-06 may have on the Company’s financial position and results of operation.

Other recent accounting pronouncements issued, but not yet effective, are not expected to be applicable to the Company or have a material effect on the consolidated financial statements upon future adoption.

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Cyclerion Separation

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Cyclerion Separation

3. Cyclerion Separation

On April 1, 2019, Ironwood completed the separation of its sGC business, and certain other assets and liabilities, into Cyclerion. The Separation was effected by means of a distribution of all of the outstanding shares of common stock, with no par value, of Cyclerion through a dividend of Cyclerion’s common stock, to Ironwood’s stockholders of record as of the close of business on March 19, 2019. Prior to the Separation on April 1, 2019, as described in Note 1, Nature of Business, Cyclerion was a wholly owned subsidiary of the Company. On March 30, 2019, the Company entered into certain agreements with Cyclerion relating to the Separation, including a separation agreement, a tax matters agreement, and an employee matters agreement.

Agreements with Cyclerion

The separation agreement with Cyclerion, dated as of March 30, 2019, sets forth, among other things, the Company’s agreements with Cyclerion regarding the principal actions to be taken in connection with the Separation, including the dividend, which was effective as of April 1, 2019. The separation agreement identifies assets transferred, liabilities assumed by and contracts assigned to each of Cyclerion and Ironwood as part of the Separation, and provides for when and how these transfers, assumptions and assignments occur. The purpose of the separation agreement was to provide Cyclerion and Ironwood with assets to operate their respective businesses and retain or assume liabilities related to those assets.

The transfer of assets and liabilities to Cyclerion was effected through a contribution in accordance with the separation agreement as summarized below (in thousands):

		As of April 1, 2019
Assets:
Prepaid expenses and other current assets	$	1,169
Property and equipment, net		10,241
Other assets		21
	$	11,431
Liabilities:
Accrued research and development costs	$	5,673
Accrued expenses and other current liabilities		3,149
	$	8,822
Net Assets Transferred to Cyclerion	$	2,609

In addition, the Company received approximately $1.3 million during the year ended December 31, 2019 associated with tenant improvement reimbursement provisions related to the Cyclerion lease in accordance with the separation agreement.

The tax matters agreement, dated as of March 30, 2019, governs each party’s rights, responsibilities and obligations with respect to taxes, including taxes, if any, incurred as a result of any failure of the Separation to qualify as tax-free. In general, if the parties incur tax liabilities in the event that the Separation is not tax-free, each party is expected to be responsible for any taxes imposed on Ironwood or Cyclerion that arise from the failure of the Separation to qualify as a transaction that is generally tax-free for U.S. federal income tax purposes, under Sections 355 and 368(a)(1)(D) and certain other relevant provisions of the Internal Revenue Code of 1986, as amended, to the extent that the failure to so qualify is attributable to an acquisition of stock or assets of, or certain actions, omissions or failures to act of, such party. If both Ironwood and Cyclerion are responsible for such failure, liability will be shared according to relative fault. U.S. tax otherwise resulting from the failure of the Separation to qualify as a transaction that is tax-free generally will be the responsibility of Ironwood. Each party otherwise agreed to indemnify the other party from and against any liability for taxes allocated to such party under the tax matters agreement and any taxes resulting from breach of any such party’s covenants under the tax matters agreement, the separation agreement, or any ancillary agreement entered into in connection with the Separation. Cyclerion agreed to certain covenants that contain restrictions intended to preserve the tax-free status of the distribution and certain related transactions.

The employee matters agreement, dated as of March 30, 2019, allocates assets, liabilities and responsibilities relating to the employment, compensation, and employee benefits of Ironwood and Cyclerion employees, and other related matters in connection with the Separation, including the treatment of outstanding Ironwood incentive equity awards. Pursuant to the employee matters agreement, the outstanding Ironwood equity awards held by Cyclerion and Ironwood employees were adjusted in connection with the Separation, with the intent to maintain, immediately following the Separation, the economic value of the awards. No incremental stock-based compensation expense related to the Separation-related adjustments was recognized during the year ended December 31, 2019 (Note 14).

Additionally, the Company entered into two transition services agreements and a development agreement with Cyclerion.

Pursuant to the transition service agreements, the Company was obligated to provide and was entitled to receive certain transition services related to corporate functions, such as finance, procurement, facilities and development. As of December 31, 2020, both transition service agreements had terminated. Amounts received for services provided to Cyclerion were recorded as other income and amounts paid for services provided by Cyclerion were recorded as selling, general and administrative expense and research and development expense, as applicable. During the years ended December 31, 2020 and 2019, the Company recorded an insignificant amount and approximately $0.3 million, respectively, as other income for services provided to Cyclerion. During each of the years ended December 31, 2020 and 2019, the Company recorded an insignificant amount in both selling, general and administrative expense and research and development expense for services provided by Cyclerion, respectively.

Pursuant to the development agreement, Cyclerion is obligated to provide the Company with certain research and development services with respect to certain of Ironwood’s products and product candidates for an initial period of two years, unless earlier terminated or extended. Such research and development activities are governed by a joint steering committee comprised of representatives from both Cyclerion and Ironwood. Services received are paid at a mutually agreed upon rate. The Company recorded approximately $2.3 million and $4.5 million in research and development expenses under the development agreement during the years ended December 31, 2020 and 2019, respectively. The Company had an insignificant amount and approximately $1.5 million of accounts payable due to Cyclerion as of December 31, 2020 and 2019, respectively.

Discontinued Operations

Upon the Separation, the Company determined its sGC business qualified for discontinued operations accounting treatment in accordance with ASC 205-20. There were no discontinued operations during year ended December 31, 2020. The following is a summary of expenses of Cyclerion classified as discontinued operations for years ended December 31, 2019 and 2018 (in thousands):

	Year Ended December 31,
	2019		2018
Costs and expenses:
Research and development	$	21,792	$	65,443
Selling, general and administrative		15,646		21,615
Restructuring expenses		—		1,164
Net loss from discontinued operations	$	37,438	$	88,222

There were no assets or liabilities related to discontinued operations as of either December 31, 2020 or December 31, 2019, as all balances were transferred to Cyclerion upon Separation.

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Net Income (Loss) Per Share

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Net Income (Loss) Per Share

4. Net Income (Loss) Per Share

The following table sets forth the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):

	Year Ended December 31,
	2020		2019		2018
Numerator:
Net income (loss)	$	106,176	$	21,505	$	(282,368)
Denominator:
Weighted average number of common shares outstanding used in net income (loss) per share — basic		159,427		156,023		152,634
Effect of dilutive securities:
Stock options		367		—		—
Time-based restricted stock units		766		—		—
Performance-based restricted stock units		1		—		—
Restricted stock		94		—		—
Dilutive potential common shares
Weighted average number of common shares outstanding used in net income (loss) per share — diluted		160,655		156,023		152,634
Net income (loss) per share — basic		0.67		0.14		(1.85)
Net income (loss) per share — diluted	$	0.66	$	0.14	$	(1.85)

The outstanding securities have been excluded from the computation of diluted weighted average shares outstanding, as applicable, as their effect would be anti-dilutive (in thousands):

	Year Ended December 31,
	2020	2019	2018
Stock options	11,746	17,194	20,457
Restricted stock awards	2	182	65
Time-based restricted stock units	209	3,207	3,058
Performance-based restricted stock units	93	—	—
Note Hedge Warrants	8,318	8,318	20,250
2022 Convertible Notes	8,318	8,318	20,250
2024 Convertible Notes	14,934	14,934	—
2026 Convertible Notes	14,934	14,934	—
	58,554	67,087	64,080

The potentially dilutive impact of the 2022 Convertible Notes, 2024 Convertible Notes and 2026 Convertible notes (together, the “Convertible Senior Notes”) (Note 11) is determined using the treasury stock method. Under this method, no numerator or denominator adjustments arise from the principal and interest components of the Convertible Senior Notes because the Company has the intent and ability to settle the Convertible Senior Notes’ principal and interest in cash. Instead, the Company is required to increase the diluted net income (loss) per share denominator by the variable number of shares that would be issued upon conversion if it settled the conversion spread obligation with shares. For diluted net income (loss) per share purposes, the conversion spread obligation is calculated based on whether the average market price of the Company’s Class A Common Stock during the reporting period is in excess of the conversion price of the Convertible Senior Notes. There was no calculated spread added to the denominator for the years ended December 31, 2020, 2019, or 2018.

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Goodwill and Intangible Assets

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Goodwill and Intangible Assets

5. Goodwill and Intangible Assets

The Company closed a transaction with AstraZeneca (the “Lesinurad Transaction”) on June 2, 2016 (the “Acquisition Date”) pursuant to which the Company received an exclusive license to develop, manufacture and commercialize the Lesinurad Products in the U.S. In August 2018, the Company delivered to AstraZeneca a notice of termination of the lesinurad license agreement, which termination was made with respect to all products under the lesinurad license agreement.

The value of the developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets as of the Acquisition Date was approximately $22.0 million and approximately $145.1 million, respectively. As of July 31, 2018, the accumulated amortization for developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets was approximately $3.6 million and approximately $11.7 million, respectively.

During the year ended December 31, 2018, the Company completed its initiative to evaluate the optimal mix of investments for the lesinurad franchise for uncontrolled gout using a comprehensive marketing mix in select test markets (with paired controls). Data from the test markets did not meet expectations. As a result, during the year ended December 31, 2018, the Company reduced its projected revenue and net cash flow assumptions associated with the value of its developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets. Accordingly, the Company evaluated its developed technology – ZURAMPIC and developed technology – DUZALLO intangible assets for impairment and recorded an approximately $151.8 million impairment charge during the year ended December 31, 2018. The impairment assessment performed utilized the revised projected revenue and net cash flows assumed through the termination of the lesinurad license agreement, resulting in an impairment of the full carrying value of the intangible assets. The impairment charge was recorded as impairment of intangible assets in the Company’s consolidated statement of operations.

The Company tests its goodwill for impairment annually as of October 1^st, or more frequently if events or changes in circumstances indicate an impairment may have occurred (Note 2). There were no impairments of goodwill during the years ended December 31, 2020, 2019, and 2018.

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Collaboration, License, Promotion and Other Commercial Agreements

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Collaboration, License, Promotion and Other Commercial Agreements

6. Collaboration, License, Co-Promotion and Other Commercial Agreements

For the year ended December 31, 2020, the Company had linaclotide collaboration agreements with AbbVie for North America and AstraZeneca for China (including Hong Kong and Macau), as well as linaclotide license agreements with Astellas for Japan and with AbbVie for the AbbVie License Territory. The Company also had an agreement with Alnylam to perform disease awareness activities for AHP and sales detailing activities for GIVLAARI. The following table provides amounts included in the Company’s consolidated statements of operations as collaborative arrangements revenue and sale of API primarily attributable to transactions from these arrangements (in thousands):

	Year Ended December 31,
Collaborative Arrangements Revenue	2020		2019		2018
Linaclotide Collaboration and License Agreements:
AbbVie (North America)	$	370,902	$	327,591	$	266,177
AbbVie (Europe and other)		2,196		1,718		1,146
AstraZeneca (China, including Hong Kong and Macau)		682		32,628		—
Astellas (Japan)		2,128		10,147		—
Co-Promotion and Other Agreements:
AbbVie (VIBERZI)(1)		—		3,723		4,290
Alnylam (GIVLAARI)		4,302		2,000		—
Other		1,335		1,845		1,226
Total collaborative arrangements revenue	$	381,545	$	379,652	$	272,839
Sale of API
Linaclotide Agreements:
Astellas (Japan)	$	2,017	$	45,788	$	69,599
AstraZeneca (China, including Hong Kong and Macau)		5,540		2,973		—
Other		421		—		756
Total sale of API	$	7,978	$	48,761	$	70,355

(1) The Company had an agreement with AbbVie to perform sales detailing activities for VIBERZI® (eluxadoline) which terminated as of December 31, 2019.

Accounts receivable, net, included approximately $145.8 million primarily related to collaborative arrangements revenue and sale of API, collectively, as of December 31, 2020, including approximately $110.9 million of accounts receivable, net, which includes approximately $4.3 million of accounts payable from the Company’s partner, AbbVie. Accounts receivable, net, included approximately $43.9 million related to collaborative arrangements revenue and sale of API, collectively, as of December 31, 2019.

The Company previously reflected amounts due from Allergan prior to its acquisition by AbbVie in May 2020 as related party accounts receivable. As of December 31, 2019, related party accounts receivable, net, included approximately $110.1 million related to collaborative arrangements revenue, net of approximately $4.1 million of related party accounts payable. Following acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company (Note 17).

At December 31, 2019, deferred revenue was approximately $0.9 million related to the disease education and promotional agreement with Alnylam. At December 31, 2020, no deferred revenue was recorded.

The Company routinely assesses the creditworthiness of its license and collaboration partners. The Company has not experienced any material losses related to receivables from its license or collaboration partners during the years ended December 31, 2020, 2019, or 2018.

Linaclotide Agreements

Collaboration Agreement for North America with AbbVie

In September 2007, the Company entered into a collaboration agreement with AbbVie to develop and commercialize linaclotide for the treatment of IBS-C, CIC, and other GI conditions in North America. Under the terms of this collaboration agreement, the Company received a non-refundable, upfront licensing fee and shares equally with AbbVie all development costs as well as net profits or losses from the development and sale of linaclotide in the U.S. The Company receives royalties in the mid-teens percent based on net sales in Canada and Mexico. AbbVie is solely responsible for the further development, regulatory approval and commercialization of linaclotide in those countries and funding any costs. The collaboration agreement for North America also includes contingent milestone payments, as well as a contingent equity investment, based on the achievement of specific development and commercial milestones. At December 31, 2019, $205.0 million in license fees and all six development milestone payments had been received by the Company, as well as a $25.0 million equity investment in the Company’s capital stock. The Company can also achieve up to $80.0 million in a sales-related milestone if certain conditions are met, which will be recognized as collaborative arrangements revenue when it is probable that a significant reversal of revenue would not occur, and the associated constraints have been lifted.

During the years ended December 31, 2020, 2019 and 2018, the Company incurred approximately $20.1 million, approximately $37.6 million, and approximately $39.2 million in total research and development expenses under the linaclotide collaboration for North America. As a result of the research and development cost-sharing provisions of the linaclotide collaboration for North America, the Company incurred approximately $5.6 million during the year ended December 31, 2020, and offset approximately $7.2 million and approximately $9.0 million in research and development costs during the years ended December 31, 2019 and 2018, respectively, to reflect the obligations of each party under the collaboration to bear 50% of the development costs incurred.

The Company and AbbVie began commercializing LINZESS in the U.S. in December 2012. The Company receives 50% of the net profits and bears 50% of the net losses from the commercial sale of LINZESS in the U.S. Net profits or net losses consist of net sales of LINZESS to third-party customers and sublicense income in the U.S. less the cost of goods sold as well as selling, general and administrative expenses. LINZESS net sales are calculated and recorded by AbbVie and may include gross sales net of discounts, rebates, allowances, sales taxes, freight and insurance charges, and other applicable deductions.

The Company evaluated its collaboration arrangement for North America with AbbVie and concluded that all development-period performance obligations had been satisfied as of September 2012. However, the Company has determined that there are three remaining commercial-period performance obligations, which include the sales detailing of LINZESS, participation in the joint commercialization committee, and approved additional trials. The consideration remaining includes cost reimbursements in the U.S., as well as commercial sales-based milestones and net profit and loss sharing payments based on net sales in the U.S. Additionally, the Company receives royalties in the mid-teens percent based on net sales in Canada and Mexico. Royalties, commercial sales-based milestones, and net profit and loss sharing payments will be recorded as collaborative arrangements revenue or expense in the period earned, as these payments relate predominately to the license granted to AbbVie. The Company records royalty revenue in the period earned based on royalty reports from its partner, if available, or based on the projected sales and historical trends. The cost reimbursements received from AbbVie during the commercialization period will be recognized as earned in accordance with the right-to-invoice practical expedient, as the Company’s right to consideration corresponds directly with the value of the services transferred during the commercialization period.

Under the Company’s collaboration agreement with AbbVie for North America, LINZESS net sales are calculated and recorded by AbbVie and include gross sales net of discounts, rebates, allowances, sales taxes, freight and insurance charges, and other applicable deductions, as noted above. These amounts include the use of estimates and judgments, which could be adjusted based on actual results in the future. The Company records its share of the net profits or net losses from the sales of LINZESS in the U.S. on a net basis less commercial expenses, and presents the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. This treatment is in accordance with the Company’s revenue recognition policy, given that the Company is not the primary obligor and does not have the inventory risks in the collaboration agreement with AbbVie for North America. The Company relies on AbbVie to provide accurate and complete information related to net sales of LINZESS

in accordance with U.S. generally accepted accounting principles in order to calculate its settlement payments to and from AbbVie and record collaboration expense or collaborative arrangements revenue, as applicable.

From time to time, in accordance with the terms of the collaboration with AbbVie for North America, the Company engages an independent certified public accounting firm to review the accuracy of the financial reporting from AbbVie to the Company. In connection with such a review during the three months ended September 30, 2018, AbbVie reported to the Company an approximately $59.3 million negative adjustment to LINZESS net sales. The adjustment related to the cumulative difference between certain previously estimated LINZESS gross-to-net sales reserves and allowances made by AbbVie during the years ended December 31, 2015, 2016 and 2017, and subsequent actual payments made. This adjustment was primarily associated with estimated governmental and contractual rebates, as reported by AbbVie. Upon receiving this information from AbbVie, the Company recorded a change in accounting estimate to reduce collaborative arrangements revenue by approximately $29.7 million during the three months ended September 30, 2018 related to the Company’s share of this adjustment. In addition, during the three months ended December 31, 2018, AbbVie reported to the Company a true-up of approximately $0.2 million related to the previously reported adjustment for the cumulative difference between certain previously estimated LINZESS gross-to-net sales reserves and allowances.

The Company recognized collaborative arrangements revenue from the AbbVie collaboration agreement for North America during the years ended December 31, 2020, 2019, and 2018 as follows (in thousands):

	Year Ended December 31,
	2020		2019		2018
Collaborative arrangements revenue related to sales of LINZESS in the U.S.	$	368,603	$	325,429	$	264,243
Royalty revenue		2,299		2,162		1,934
Total collaborative arrangements revenue	$	370,902	$	327,591	$	266,177

The collaborative arrangements revenue recognized in the years ended December 31, 2020, 2019, and 2018 primarily represents the Company’s share of the net profits and net losses on the sale of LINZESS in the U.S.

The following table presents the amounts recorded by the Company for commercial efforts related to LINZESS in the U.S. in the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Ironwood's collaborative arrangement revenue	$	368,603	$	325,429	$	264,243
Selling, general and administrative costs incurred by the Company(1)		(39,312)		(38,123)		(42,435)
Ironwood's share of net profits(2)	$	329,291	$	287,306	$	221,808

(1) Includes Ironwood’s selling, general and administrative expenses attributable to the cost-sharing arrangement with AbbVie. Excludes approximately $0.6 million, approximately $2.4 million, and approximately $2.2 million for the years ended December 31, 2020, 2019, and 2018 respectively, related to patent prosecution and patent litigation costs recognized in connection with the collaboration agreement with AbbVie.

(2) Ironwood has recalculated its share of net profit on sales of LINZESS in the U.S. to conform with AbbVie’s recast of historically reported LINZESS U.S. net sales (previously reported by Allergan).

In May 2014, CONSTELLA^® became commercially available in Canada and, in June 2014, LINZESS became commercially available in Mexico. The Company records royalties on sales of CONSTELLA in Canada and LINZESS in Mexico in the period earned. The Company recognized approximately $2.3 million, approximately $2.2 million, and approximately $1.9 million of combined royalty revenues from Canada and Mexico during the years ended December 31, 2020, 2019, and 2018, respectively.

License Agreement with AbbVie (All countries other than the countries and territories of North America, China (including Hong Kong and Macau), and Japan)

In April 2009, the Company entered into a license agreement with Almirall, S.A. (“Almirall”) to develop and commercialize linaclotide in Europe (including the Commonwealth of Independent States and Turkey) for the treatment

of IBS-C, CIC and other GI conditions (the “European License Agreement”). In accordance with the European License Agreement, the Company granted Almirall a right to access its U.S. Phase III clinical trial data for the purposes of supporting European regulatory approval. In October 2015, Almirall transferred its exclusive license to develop and commercialize linaclotide in Europe to AbbVie.

Additionally, in October 2015, the Company and AbbVie separately entered into an amendment to the European License Agreement relating to the development and commercialization of linaclotide in Europe. Pursuant to the terms of the amendment, (i) certain sales-based milestones payable to the Company under the European License Agreement were modified to increase the total milestone payments such that, when aggregated with certain commercial launch milestones, they could total up to $42.5 million, (ii) the royalties payable to the Company during the term of the European License Agreement were modified such that the royalties based on sales volume in Europe begin in the mid-single digit percent and escalate to the upper-teens percent by calendar year 2019, and (iii) AbbVie assumed responsibility for the manufacturing of linaclotide API for Europe from the Company, as well as the associated costs. The Company concluded that the 2015 amendment to the European License Agreement was not a modification to the linaclotide collaboration agreement with AbbVie for North America.

In January 2017, the Company and AbbVie entered into an amendment to the European License Agreement (the “2017 Amendment”). The 2017 Amendment extended the license to develop and commercialize linaclotide in all countries other than China (including Hong Kong and Macau), Japan, and the countries and territories of North America. On a country-by-country and product-by-product basis in such additional territory, AbbVie is obligated to pay the Company a royalty as a percentage of net sales of products containing linaclotide as an active ingredient in the upper-single digits for five years following the first commercial sale of a linaclotide product in a country, and in the low-double digits thereafter. The royalty rate for products in the expanded territory will decrease, on a country-by-country basis, to the lower-single digits, or cease entirely, following the occurrence of certain events. The 2017 Amendment did not modify any of the milestones or royalty terms related to Europe.

In evaluating the terms of the European License Agreement, as amended, the Company determined that there are no remaining performance obligations as of September 2012. However, the Company continues to be eligible to receive consideration in the form of commercial launch milestones, sales-based milestones, and royalties.

The commercial launch milestones, sales-based milestones and royalties under the European License Agreement and the 2017 Amendment relate predominantly to the license granted to AbbVie. The Company records royalties on sales of CONSTELLA in Europe in the period earned based on royalty reports from its partner, if available, or the projected sales and historical trends under the sales-based royalty exception. The commercial launch milestones are recognized as revenue when it is probable that a significant reversal of revenue would not occur and the associated constraint has been lifted.

The Company recognized approximately $2.2 million, approximately $1.7 million and approximately $1.1 million of royalty revenue from the Amended European License Agreement during the years ended December 31, 2020, 2019, and 2018, respectively.

License Agreement for Japan with Astellas

In November 2009, the Company entered into a license agreement with Astellas, as amended, to develop and commercialize linaclotide for the treatment of IBS-C, CIC and other GI conditions in Japan (the “2009 License Agreement with Astellas”). Astellas is responsible for all activities relating to development, regulatory approval and commercialization in Japan as well as funding the associated costs and the Company was required to participate on a joint development committee over linaclotide’s development period. During the year ended December 31, 2017, the Company and Astellas entered into a commercial API supply agreement (the “Astellas Commercial Supply Agreement”). Pursuant to the Astellas Commercial Supply Agreement, the Company sells linaclotide API supply to Astellas at a contractually defined rate and recognizes related revenue as sale of API. Under the 2009 License Agreement with Astellas, the Company received royalties which escalated based on sales volume, beginning in the low-twenties percent, less the transfer price paid for the API included in the product sold and other contractual deductions.

Under the 2009 License Agreement with Astellas, the Company received an up-front licensing fee of $30.0 million and three development milestone payments that totaled $45.0 million, which were recognized as revenue prior to the adoption of ASC 606 on January 1, 2018.

The Company evaluated the terms of the 2009 License Agreement with Astellas and determined that there were no remaining performance obligations as of the adoption of ASC 606. Additionally, under the terms of the Astellas Commercial Supply Agreement, the Company determined it had an ongoing performance obligation to supply API.

During the years ended December 31, 2019 and 2018, the Company recognized revenue of approximately $27.5 million and approximately $69.6 million, respectively, from the sale of API to Astellas under the 2009 License Agreement with Astellas and the Astellas Commercial Supply Agreement. The royalties on sales of LINZESS in Japan did not exceed the transfer price of API sold and other contractual deductions during each of the periods presented.

In August 2019, the Company and Astellas amended and restated the 2009 License Agreement with Astellas (the “Amended Astellas License Agreement”). This amendment to the 2009 License Agreement with Astellas was accounted for as a separate contract. Under the terms of the Amended Astellas License Agreement, the Company is no longer responsible for the supply of linaclotide API to Astellas, and Astellas assumed responsibility for its own supply of linaclotide API in Japan in 2020.

In connection with the execution of the Amended Astellas License Agreement, Astellas paid the Company a non-refundable, upfront payment of $10.0 million in August 2019. Further, Astellas, in lieu of the royalty payment terms set forth in the 2009 License Agreement with Astellas, pays royalties to the Company at rates beginning in the mid-single digit percent and escalating to low-double-digit percent, based on aggregate annual net sales in Japan of products containing linaclotide API. These royalty payments are subject to reduction following the expiration of certain licensed patents and the occurrence of generic competition in Japan. The Company continued to supply linaclotide API for Japan during 2019 and 2020 at a contractually defined rate. Additionally, Astellas reimbursed the Company for the Company’s performance of adverse event reporting services at a fixed monthly rate until such services were terminated in February 2020.

The Company identified the following performance obligations under the Amended Astellas License Agreement:

● delivery of the expanded license of intellectual property, including the applicable manufacturing know-how;

● obligation to supply linaclotide API for 2019; and

● adverse event reporting services.

The Company allocated the $10.0 million upfront payment to the delivery of the expanded license of intellectual property and recognized it as collaborative arrangements revenue at contract inception. The Company allocated the approximately $20.4 million in remaining purchase orders for API to the obligation to supply linaclotide API to Astellas for 2019. Consideration for the supply of linaclotide API is recognized over the performance period as linaclotide API is shipped to Astellas. Consideration allocated to the adverse event reporting services is recognized as such services are provided over the performance period based on the amount to which the Company has a right to invoice.

Royalties on sales of LINZESS in Japan relate predominantly to the license granted to Astellas. Accordingly, the Company applies the sales-based royalty exception and records royalties on sales of LINZESS in Japan in the period earned based on royalty reports from its partner, if available, or the projected sales and historical trends.

The Company recognized $10.0 million in collaborative arrangements revenue during the year ended December 31, 2019 related to the upfront fee associated with the execution of the Amended Astellas License Agreement. The Company recognized approximately $2.0 million and approximately $18.3 million from the sale of API to Astellas under the Amended License Agreement during the years ended December 31, 2020 and 2019, respectively. The Company recognized approximately $2.1 million of royalty revenue during the year ended December 31, 2020. The Company recognized an insignificant amount of collaborative arrangements revenue related to adverse event reporting services in each of the years ended December 31, 2020 and 2019.

Collaboration Agreement for China (including Hong Kong and Macau) with AstraZeneca

In October 2012, the Company entered into a collaboration agreement with AstraZeneca to co-develop and co-commercialize linaclotide in the AstraZeneca License Territory (the “AstraZeneca Collaboration Agreement”). The

collaboration provided AstraZeneca with an exclusive nontransferable license to exploit the underlying technology in the AstraZeneca License Territory. The parties shared responsibility for continued development and commercialization of linaclotide under a joint development plan and a joint commercialization plan, respectively, with AstraZeneca having primary responsibility for the local operational execution.

In September 2019, the Company and AstraZeneca entered into an amendment and restatement of the AstraZeneca Collaboration Agreement (the “Amended AstraZeneca Agreement”) under which AstraZeneca obtained the exclusive right to develop, manufacture and commercialize products containing linaclotide in the AstraZeneca License Territory (the “AstraZeneca License”).

Prior to the execution of the Amended AstraZeneca Agreement, the Company identified the following performance obligations under the AstraZeneca Collaboration Agreement:

● research, development and regulatory services pursuant to the development plan (“R&D Services”);

● Joint Development Committee (“JDC”) services;

● obligation to supply clinical trial material; and

● Joint Commercialization Committee services.

Under the original AstraZeneca Collaboration Agreement, the Company shared development costs with AstraZeneca, with AstraZeneca incurring 55% of the net losses from the development and commercialization of linaclotide in the AstraZeneca License Territory. Payments from AstraZeneca with respect to both research and development and selling, general and administrative costs incurred by the Company prior to the commercialization of linaclotide in the AstraZeneca License Territory were recorded as a reduction in expense. Development costs incurred by the Company that pertained to the joint development plan and subsequent amendments to the joint development plan, as approved by the JDC, were recorded as research and development expense as incurred. Payments to AstraZeneca were recorded as incremental research and development expense. During the years ended December 31, 2019 and 2018, the Company incurred approximately $1.2 million and approximately $0.9 million, respectively, related to pre-launch commercial services and supply chain services.

Under the Amended AstraZeneca Agreement, the Company is entitled to receive non-contingent payments totaling $35.0 million in three installments through 2024, of which $10.0 million was received in January 2021. In addition, AstraZeneca may be required to make milestone payments totaling up to $90.0 million contingent on the achievement of certain sales targets and will be required to pay tiered royalties to the Company at rates beginning in the mid-single-digit percent and increasing up to twenty percent based on the aggregate annual net sales of products containing linaclotide in the AstraZeneca License Territory. In connection with the Amended AstraZeneca Agreement, the Company and AstraZeneca entered into a transition services agreement (“AstraZeneca TSA”) and an amended commercial supply agreement (“AstraZeneca CSA”). Under the terms of the AstraZeneca TSA, the Company will provide certain regulatory and administrative services for a term of approximately two years from the date of execution, unless earlier terminated or extended. Services performed are paid at a mutually agreed upon rate. Amounts for AstraZeneca TSA services are recorded as collaborative arrangements revenue. Under the terms of the AstraZeneca CSA, the Company supplied linaclotide API, finished drug product and finished goods for the Licensed Territory through March 31, 2020 at predetermined rates.

The Company evaluated the Amended AstraZeneca Agreement and determined that it would be accounted for as a separate contract because it adds a distinct good or service at an amount that reflects standalone selling price. The following performance obligations under the Amended AstraZeneca Agreement were identified:

● delivery of the expanded AstraZeneca License;

● AstraZeneca TSA services; and

● supply of linaclotide API, finished drug product and finished goods under the AstraZeneca CSA.

The Company determined that the non-contingent payments should be allocated to the delivery of the expanded AstraZeneca License. The Company determined that the performance obligation related to the transfer of the AstraZeneca License was satisfied as of the execution date of the Amended AstraZeneca Agreement. As a portion of the payments relating to the transfer of the AstraZeneca License are due significantly after the performance obligation was satisfied, the Company adjusted its transaction price for the significant financing component of approximately $2.6 million. Accordingly, the Company recognized approximately $32.4 million relating to the delivery of the AstraZeneca License as collaborative arrangements revenue at contract inception and will recognize the approximately $2.6 million relating to the significant financing component as interest income through 2024 using the effective interest method. Consideration allocated to the AstraZeneca TSA services will be recognized as collaborative arrangements revenue as such services are provided over the performance period based on the amount to which the Company has a right to invoice. Consideration for the supply of linaclotide API, finished drug product and finished goods under the AstraZeneca CSA was recognized over the performance period as linaclotide API, finished drug product and finished goods were shipped to AstraZeneca.

During the year ended December 31, 2020, the Company recognized approximately $0.7 million in collaborative arrangements revenue related to the Amended AstraZeneca License, of which approximately $0.6 million related to the AstraZeneca TSA services and approximately $0.1 million related to royalties. During the year ended December 31, 2020, the Company recognized approximately $5.5 million of sale of API on its consolidated statement of operations relating to the supply of linaclotide finished drug product and finished goods under the AstraZeneca CSA. During the year ended December 31, 2019, the Company recognized approximately $32.6 million in collaborative arrangements revenue related to the Amended AstraZeneca License, of which approximately $32.4 million related to the delivery of the AstraZeneca License and approximately $0.2 million related to the AstraZeneca TSA services. During the year ended December 31, 2019, the Company recognized approximately $3.0 million of sale of API on its consolidated statement of operations relating to the supply of linaclotide finished drug product and finished goods under the AstraZeneca CSA.

Co-Promotion and Other Agreements

Disease Education and Promotional Agreement with Alnylam

In August 2019, the Company and Alnylam entered into a disease education and promotional agreement for Alnylam’s GIVLAARI, and this agreement was subsequently amended in December 2020 (the “Alnylam Agreement”). GIVLAARI was approved by the U.S. FDA in November 2019 for the treatment of adult patients with AHP. Under the terms of the Alnylam Agreement, the Company’s sales force is performing disease awareness activities and sales detailing activities for GIVLAARI to gastroenterologists and health care practitioners to whom they detail LINZESS in the first position over the term of the agreement, which is approximately three years.

Under the Alnylam Agreement, the Company received service fees, totaling approximately $5.5 million for services rendered through December 31, 2020. The Company also is eligible to receive royalties based on a percentage of net sales of GIVLAARI that are directly attributable to the Company’s promotional efforts over the term of the agreement. The Company identified the following performance obligation under the Alnylam Agreement:

● performance of disease education activities for AHP and performance of sales details for GIVLAARI (together “Givosiran Education and Promotion Activities”).

The Company allocated the service fees to the performance of Givosiran Education and Promotion Activities and recognized collaborative arrangements revenue through December 31, 2020 as the services were performed based on the amount to which the Company had a right to invoice. Royalties are recognized as collaborative arrangements revenue for Givosiran Education and Promotion Activities based on the amount to which the Company has a right to invoice when the associated constraints have been lifted.

During the years ended December 31, 2020 and 2019, the Company recognized approximately $3.5 million and approximately $2.0 million, respectively, in collaborative arrangements revenue related to the service fees. During the year ended December 31, 2020, the Company recognized approximately $0.8 million in royalty revenue related to the Alnylam Agreement. The Company did not recognize any royalty revenue related to the Alnylam Agreement during the year ended December 31, 2019. As of December 31, 2019, the Company had a deferred revenue balance of

approximately $0.9 million related to advance billings of service fees. As of December 31, 2020, the Company had no deferred revenue.

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Fair Value of Financial Instruments

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Fair Value of Financial Instruments

7. Fair Value of Financial Instruments

The tables below present information about the Company’s assets that are measured at fair value on a recurring basis as of December 31, 2020 and 2019 and indicate the fair value hierarchy of the valuation techniques the Company utilized to determine such fair value. In general, fair values determined by Level 1 inputs utilize observable inputs such as quoted prices in active markets for identical assets or liabilities. Fair values determined by Level 2 inputs utilize data points that are either directly or indirectly observable, such as quoted prices for similar instruments in active markets, interest rates and yield curves. Fair values determined by Level 3 inputs utilize unobservable data points in which there is little or no market data, which require the Company to develop its own assumptions for the asset or liability.

The Company’s investment portfolio may include fixed income securities that do not always trade on a daily basis. As a result, the pricing services used by the Company apply other available information as applicable through processes such as benchmark yields, benchmarking of like securities, sector groupings and matrix pricing to prepare valuations. In addition, model processes are used to assess interest rate impact and develop prepayment scenarios. These models take into consideration relevant credit information, perceived market movements, sector news and economic events. The inputs into these models may include benchmark yields, reported trades, broker-dealer quotes, issuer spreads and other relevant data. The Company validates the prices provided by its third party pricing services by obtaining market values from other pricing sources and analyzing pricing data in certain instances. The Company also invests in certain reverse repurchase agreements, which are collateralized by Government Securities and Obligations for an amount not less than 102% of their principal amount. The Company does not record an asset or liability for the collateral as the Company is not permitted to sell or re-pledge the collateral. The collateral has at least the prevailing credit rating of U.S. Government Treasuries and Agencies. The Company utilizes a third party custodian to manage the exchange of funds and ensure the collateral received is maintained at 102% of the reverse repurchase agreements principal amount on a daily basis.

The following tables present the assets and liabilities the Company has measured at fair value on a recurring basis (in thousands):

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents:
Money market funds	$	349,014	$	349,014	$	—	$	—
Restricted cash:
Money market funds		2,221		2,221		—		—
Convertible note hedges		13,065		—		—		13,065
Total assets measured at fair value	$	364,300	$	351,235	$	—	$	13,065
Liabilities:
Note hedge warrants	$	12,088	$	—	$	—	$	12,088
Total liabilities measured at fair value	$	12,088	$	—	$	—	$	12,088

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2019		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents:
Money market funds	$	139,190	$	139,190	$	—	$	—
Repurchase agreements		37,800		37,800		—		—
Restricted cash:
Money market funds		2,221		2,221		—		—
Convertible note hedges		31,366		—		—		31,366
Total assets measured at fair value	$	210,577	$	179,211	$	—	$	31,366
Liabilities:
Note hedge warrants	$	24,260	$	—	$	—	$	24,260
Total liabilities measured at fair value	$	24,260	$	—	$	—	$	24,260

There were no transfers between fair value measurement levels during each of the years ended December 31, 2020 or 2019.

Cash equivalents, accounts receivable, related party accounts receivable, prepaid expenses and other current assets, accounts payable, related party accounts payable, accrued research and development costs, accrued expenses and other current liabilities, current portion of operating lease obligations, and deferred revenue at December 31, 2020 and 2019 are carried at amounts that approximate fair value due to their short-term maturities.

Convertible Note Hedges and Note Hedge Warrants with Respect to 2022 Convertible Notes

The Company’s Convertible Note Hedges and the Note Hedge Warrants are recorded as derivative assets and liabilities, respectively, and are classified as Level 3 measurements under the fair value hierarchy. These derivatives are not actively traded and are valued using the Black-Scholes option-pricing model, which requires the use of subjective assumptions. Significant inputs used to determine the fair value as of December 31, 2020 included the price per share of the Company’s Class A Common Stock, expected terms of the derivative instruments, strike prices of the derivative instruments, risk-free interest rates, and expected volatility of the Company’s Class A Common Stock. Changes to these inputs could materially affect the valuation of the Convertible Note Hedges and Note Hedge Warrants.

The following inputs were used in the fair market valuation of the Convertible Note Hedges and Note Hedge Warrants as of December 31, 2020 and 2019:

	December 31,						December 31,
	2020						2019
	Convertible			Note Hedge			Convertible			Note Hedge
	Note Hedges			Warrants			Note Hedges			Warrants
Risk-free interest rate (1)		0.1	%		0.1	%		1.6	%		1.6	%
Expected term		1.5			2.0			2.5			3.0
Stock price (2)	$	11.39		$	11.39		$	13.31		$	13.31
Strike price (3)	$	14.51		$	18.82		$	14.51		$	18.82
Common stock volatility (4)		46.7	%		50.3	%		49.1	%		46.5	%
Dividend yield (5)		—	%		—	%		—	%		—	%

(1) Based on U.S. Treasury yield curve, with terms commensurate with the expected terms of the Convertible Note Hedges and the Note Hedge Warrants.

(2) The closing price of the Company’s Class A Common Stock on the last trading days of the years ended December 31, 2020 and 2019, respectively.

(3) As per the respective agreements for the Convertible Note Hedges and Note Hedge Warrants.

(4) Expected volatility based on historical volatility of the Company’s Class A Common Stock.

(5) The Company has not paid and does not anticipate paying cash dividends on its shares of common stock in the foreseeable future; therefore, the expected dividend yield is assumed to be zero.

The Convertible Note Hedges and the Note Hedge Warrants are recorded at fair value at each reporting date and changes in fair value are recorded in other (expense) income, net within the Company's consolidated statements of operations.

The following table reflects the change in the Company's Level 3 Convertible Note Hedges and Note Hedge Warrants from December 31, 2018 through December 31, 2020 (in thousands):

	Convertible		Note Hedge
	Note Hedges		Warrants
Balance at December 31, 2018	$	41,020	$	(33,763)
Cash settlement (received) paid upon early termination of derivatives (Note 11)		(28,909)		25,735
Change in fair value, recorded as a component of gain (loss) on derivatives		19,255		(16,232)
Balance at December 31, 2019	$	31,366	$	(24,260)
Change in fair value, recorded as a component of (loss) gain on derivatives		(18,301)		12,172
Balance at December 31, 2020	$	13,065	$	(12,088)

Convertible Senior Notes

In June 2015, the Company issued approximately $335.7 million aggregate principal amount of its 2022 Convertible Notes. In August 2019, the Company issued $200.0 million aggregate principal amount of its 2024 Convertible Notes and $200.0 million aggregate principal amount of its 2026 Convertible Notes, and used a portion of the proceeds from such issuances to repurchase $215.0 million aggregate principal amount of its 2022 Convertible Notes. The Company separately accounted for the liability and equity components of each of the 2022 Convertible Notes, 2024 Convertible Notes, and 2026 Convertible Notes, by allocating the proceeds between the liability component and equity component (Note 11). The fair value of the respective convertible senior notes, which differs from their carrying value, is influenced by interest rates, the price of the Company’s Class A Common Stock and the volatility thereof, and the prices for the respective convertible senior notes observed in market trading, which are Level 2 inputs.

The estimated fair value of the 2022 Convertible Notes as of December 31, 2020 and 2019 was approximately $130.2 million and $141.3 million, respectively. The estimated fair value of the 2024 Convertible Notes as of December 31, 2020 and 2019 was approximately $222.3 million and $235.7 million, respectively. The estimated fair value of the 2026 Convertible Notes as of December 31, 2020 and 2019 was approximately $224.1 million and $240.1 million, respectively.

Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes

In connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into the Capped Calls with certain financial institutions. The Capped Calls cover 29,867,480 shares of Class A Common Stock (subject to anti-dilution and certain other adjustments), which is the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes. The Capped Calls have an initial strike price of approximately $13.39 per share, which corresponds to the initial conversion price of the 2024 Convertible Notes and the 2026 Convertible Notes, and have a cap price of approximately $17.05 per share (Note 11). The strike price and cap price are subject to anti-dilution adjustments generally similar to those applicable to the 2024 Convertible Notes and the 2026 Convertible Notes. These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met (Note 11).

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Leases

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Leases

8. Leases

Effective January 1, 2019, the Company adopted ASC 842 using the optional transition method. The Company’s lease portfolio for the year ended December 31, 2020 includes: a lease for its current headquarters location, a data center colocation lease, vehicle leases for its salesforce representatives, and leases for computer and office equipment.

Lease cost is recognized on a straight-line basis over the lease term. The components of lease cost for the year ended December 31, 2020 and 2019 are as follows (in thousands):

	Year Ended December 31,
	2020		2019
Operating lease cost during period, net(1)	$	2,530	$	16,452
Variable lease payments		—		1,526
Short-term lease cost		1,420		1,512
Total lease cost	$	3,950	$	19,490

(1) Operating lease cost is presented net of approximately $0.3 million of sublease income for the year ended December 31, 2019 related to a sublease agreement between Ironwood and Cyclerion executed upon Separation. The sublease agreement terminated in May 2019.

Supplemental cash flow information related to leases for the periods reported is as follows:

	Year Ended December 31,
	2020			2019
Right-of-use assets obtained in exchange for new operating lease upon adoption of ASC 842 (in thousands)	$	—		$	88,299
Adjustment to right-of-use assets as a result of the lease modification upon Separation (in thousands)		—			(40,427)
Adjustment to right-of-use assets as a result of the termination of the Binney Street Lease (in thousands)		—			(34,440)
Right-of-use assets obtained in exchange for new operating lease liabilities upon execution of Summer Street Lease (in thousands)		—			18,452
Cash paid for amounts included in the measurement of lease liabilities (in thousands)		1,146			18,598
Weighted-average remaining lease term of operating leases (in years)		9.3			10.2
Weighted-average discount rate of operating leases		5.8	%		5.8	%

Future minimum lease payments under non-cancelable operating leases as of December 31, 2020 are as follows (in thousands):

	Operating
	Lease
	Payments
2021	$	3,128
2022		3,129
2023		3,065
2024		3,126
2025		3,189
2026 and thereafter		14,856
Total future minimum lease payments		30,493
Less: present value adjustment		(7,047)
Operating lease liabilities at December 31, 2020		23,446
Less: current portion of operating lease liabilities		(3,128)
Operating lease liabilities, net of current portion	$	20,318

Summer Street Lease (current headquarters)

In June 2019, the Company entered into a non-cancelable operating lease (the “Summer Street Lease”) for approximately 39,000 square feet of office space on the 23^rd floor of 100 Summer Street, Boston, Massachusetts, which began serving as the Company’s headquarters in October 2019, replacing its prior headquarters at 301 Binney Street in Cambridge, Massachusetts. The Summer Street Lease terminates on June 11, 2030 and includes a 2% annual rent escalation, free rent periods, a tenant improvement allowance, and an option to extend the term of the lease for an

additional five years at a market base rental rate. The rent expense, inclusive of the escalating rent payments and lease incentives, is recognized on a straight-line basis over the lease term. Additionally, the Summer Street Lease requires a letter of credit to secure the Company’s obligations under the lease agreement of approximately $1.0 million, which is collateralized by a money market account recorded as restricted cash on the Company’s consolidated balance sheet as of December 31, 2020.

At lease inception, the Company recorded a right-of-use asset and a lease liability associated with the Summer Street Lease using an incremental borrowing rate of approximately 5.8%. At December 31, 2020, the balances of the right-of-use asset and operating lease liability were approximately $16.6 million and approximately $23.2 million, respectively. At December 31, 2019, the balances of the right-of-use asset and operating lease liability were approximately $17.7 million and approximately $22.8 million, respectively.

Lease costs related to the Summer Street Lease recorded during the years ended December 31, 2020 and 2019 were approximately $2.5 million and approximately $1.5 million, respectively.

Binney Street Lease (prior headquarters)

The Company rented office space at 301 Binney Street, Cambridge, Massachusetts under a non-cancelable operating lease entered into in January 2007, as amended (“Binney Street Lease”) through October 2019.

On April 1, 2019, the Company modified the Binney Street Lease to reduce its leased premises to approximately 108,000 rentable square feet of office space on the first and third floors. The surrendered portion of approximately 114,000 rentable square feet on the first and second floor of the building was subsequently occupied by Cyclerion under a direct lease between Cyclerion and the Binney Street landlord. As a result of the modification, the Company adjusted the value of its right-of-use asset and operating lease liability using an incremental borrowing rate of approximately 5.1%, and recognized a gain of approximately $3.2 million, which was recorded as a reduction to operating expenses on its consolidated statement of operations. The Company elected to determine the proportionate reduction in the right-of-use asset based on the reduction to the lease liability.

As of January 1, 2019, in conjunction with the adoption of ASC 842, the Company recorded a right-of-use asset of approximately $87.7 million and a lease liability of approximately $94.3 million associated with the Binney Street Lease.

On June 11, 2019, the Company entered into a lease termination agreement (the “Lease Termination”) with the Binney Street landlord to terminate the Company’s lease for approximately 108,000 square feet of office space. The Lease Termination was effective during the fourth quarter of 2019 in exchange for an approximately $9.0 million payment. The Lease Termination was accounted for as a lease modification that reduces the term of the existing lease and the Company adjusted the value of its right-of-use asset and operating lease liability using an incremental borrowing rate of approximately 4.0%.

Lease cost related to the Binney Street Lease recorded during the year ended December 31, 2019 was approximately $16.3 million, net of sublease income of approximately $0.3 million. Under ASC 840, rent expense related to the Binney Street Lease recorded during the year ended December 31, 2018 was approximately $10.0 million.

Vehicle fleet leases

During April 2018, the Company entered into a master services agreement containing 12-month leases (the “2018 Vehicle Leases”) for vehicles within its fleet for its field-based sales force and medical science liaisons. These leases are classified as short-term in accordance with the practical expedient in ASC 842. The 2018 Vehicle Leases expire at varying times, with a monthly renewal provision. In accordance with the terms of the 2018 Vehicle Leases, the Company maintains a letter of credit securing its obligation under the lease agreements of $1.3 million, which is collateralized by a money market account recorded as restricted cash on the Company’s consolidated balance sheets as of December 31, 2020 and 2019.

Lease cost related to the 2018 Vehicle Leases was approximately $1.4 million and approximately $1.5 million, respectively, for the years ended December 31, 2020 and 2019. Under ASC 840, lease cost related to the 2018 Vehicle Leases was approximately $0.8 million for the year ended December 31, 2018.

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Property and Equipment

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Property and Equipment

9. Property and Equipment

Property and equipment, net consisted of the following (in thousands):

	December 31,
	2020		2019
Software	$	8,615	$	9,568
Leasehold improvements		7,407		7,318
Laboratory equipment		1,898		2,193
Furniture and fixtures		1,517		1,508
Computer and office equipment		1,297		1,293
Construction in process		—		631
		20,734		22,511
Less accumulated depreciation and amortization		(11,805)		(10,082)
	$	8,929	$	12,429

Depreciation expense of property and equipment was approximately $2.3 million and $5.6 million for the years ended December 31, 2020 and 2019, respectively. Depreciation and amortization expense of property and equipment, including amounts recorded under capital leases under ASC 840, was approximately $3.9 million for the year ended December 31, 2018.

During the year ended December 31, 2020, the Company recorded approximately $1.2 million in restructuring expenses in its consolidated statement of operations related to the impairment of certain fixed assets as a result of its decision to discontinue IW-3718 development.

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Accrued Expenses and Other Current Liabilities

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Accrued Expenses and Other Current Liabilities

10. Accrued Expenses and Other Current Liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31,
	2020		2019
Accrued incentive compensation	$	8,719	$	11,760
Accrued vacation		2,625		2,540
Professional fees		530		1,421
Salaries		627		2,973
Other employee benefits		1,442		1,260
Restructuring liabilities		10,510		179
Other		2,033		10,332
	$	26,486	$	30,465

As of December 31, 2020, other accrued expenses of approximately $2.0 million included approximately $1.6 million of uninvoiced vendor liabilities and approximately $0.3 million of accrued interest.

As of December 31, 2019, other accrued expenses of approximately $10.3 million included approximately $4.1 million related to API batches uninvoiced, approximately $0.9 million related to activities associated with the Company’s move to the 100 Summer Street headquarters, approximately $0.6 million related to unbilled inventory, approximately $0.3 million of accrued interest, and approximately $0.2 million related to equipment for clinical studies.

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Notes Payable

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Notes Payable

11. Notes Payable

8.375% Notes due 2026

On September 23, 2016, the Company closed a direct private placement, pursuant to which the Company issued $150.0 million in aggregate principal amount of 8.375% Notes due 2026 (the “2026 Notes”) and received net proceeds of approximately $11.2 million. The Company capitalized approximately $0.5 million of debt issuance costs, which were netted against the carrying value of the 2026 Notes. Proceeds from the issuance of the 2024 Convertible Notes and the

2026 Convertible Notes were used, in part, to redeem the outstanding principal balance of the 2026 Notes in September 2019. The Company retired the 2026 Notes, which had an outstanding aggregate principal balance of approximately $116.5 million, for a redemption price of approximately $123.0 million. The redemption of the 2026 Notes resulted in a loss on extinguishment of debt of approximately $7.6 million related to the prepayment premium and write-off of the unamortized debt issuance costs and unamortized debt discount.

The 2026 Notes had an annual interest rate of 8.375%, with interest payable March 15, June 15, September 15 and December 15 of each year (each an “8.375% Payment Date”). Principal of the 2026 Notes was payable on the 8.375% Payment Dates beginning March 15, 2019. From March 15, 2019, the Company made quarterly payments on the 2026 Notes equal to the greater of (i) 7.5% of net sales of linaclotide in the U.S. for the preceding quarter (the “8.375% Synthetic Royalty Amount”) and (ii) accrued and unpaid interest on the 2026 Notes (the “8.375% Required Interest Amount”). Principal on the 2026 Notes was due to be repaid in an amount equal to the 8.375% Synthetic Royalty Amount minus the 8.375% Required Interest Amount, when this was a positive number, until the principal had been paid in full.

Convertible Senior Notes

2.25% Convertible Senior Notes due 2022

In June 2015, the Company issued approximately $335.7 million aggregate principal amount of the 2022 Convertible Notes. The Company received net proceeds of approximately $324.0 million from the sale of the 2022 Convertible Notes, after deducting fees and expenses of approximately $11.7 million. The Company used approximately $21.1 million of the net proceeds from the sale of the 2022 Convertible Notes to pay the net cost of the Convertible Note Hedges (after such cost was partially offset by the proceeds to the Company from the sale of the Note Hedge Warrants), as described below.

The 2022 Convertible Notes are governed by an indenture (the “2022 Indenture”) between the Company and U.S. Bank National Association, as trustee (the “Trustee”). The 2022 Convertible Notes are senior unsecured obligations and bear cash interest at the annual rate of 2.25%, payable on June 15 and December 15 of each year. The 2022 Convertible Notes will mature on June 15, 2022, unless earlier converted or repurchased. The Company may settle conversions of the 2022 Convertible Notes through payment or delivery, as the case may be, of cash, shares of the Company’s Class A Common Stock or a combination of cash and shares of Class A Common Stock, at the Company’s option (subject to, and in accordance with, the settlement provisions of the 2022 Indenture). The initial conversion rate for the 2022 Convertible Notes was 60.3209 shares of Class A Common Stock (subject to adjustment as provided for in the 2022 Indenture) per $1,000 principal amount of the 2022 Convertible Notes, which was equal to an initial conversion price of approximately $16.58 per share and 20,249,665 shares.

In connection with the Separation, in April 2019, the conversion rate under the 2022 Indenture was adjusted to equal 68.9172 shares of Class A Common Stock per $1,000 principal amount of the 2022 Convertible Notes, which is equal to an adjusted conversion price of approximately $14.51 per share and 23,135,435 shares.

Holders of the 2022 Convertible Notes may convert their 2022 Convertible Notes at their option at any time prior to the close of business on the business day immediately preceding December 15, 2021 in multiples of $1,000 principal amount, only under the following circumstances:

● during any calendar quarter commencing after the calendar quarter ending on September 30, 2015 (and only during such calendar quarter), if the last reported sale price of the Company’s Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the 2022 Convertible Notes on each applicable trading day;

● during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in the 2022 Indenture) per $1,000 principal amount of the 2022 Convertible Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of the Company’s Class A Common Stock and the conversion rate for the 2022 Convertible Notes on each such trading day; or

● upon the occurrence of specified corporate events described in the 2022 Indenture.

On or after December 15, 2021, until the close of business on the second scheduled trading day immediately preceding June 15, 2022, holders may convert their 2022 Convertible Notes, in multiples of $1,000 principal amount, at the option of the holder regardless of the foregoing circumstances.

The Company may not redeem the 2022 Convertible Notes prior to the maturity date and no “sinking fund” is provided for by the 2022 Convertible Notes, which means that the Company is not required to periodically redeem or retire the 2022 Convertible Notes. Upon the occurrence of certain fundamental changes involving the Company, holders of the 2022 Convertible Notes may require the Company to repurchase for cash all or part of their 2022 Convertible Notes at a repurchase price equal to 100% of the principal amount of the 2022 Convertible Notes to be repurchased, plus accrued and unpaid interest. If a make-whole fundamental change, as described in the 2022 Indenture, occurs and a holder elects to convert its 2022 Convertible Notes in connection with such make-whole fundamental change, such holder may be entitled to an increase in the conversion rate as described in the 2022 Indenture.

The 2022 Indenture does not contain any financial covenants or restrict the Company’s ability to repurchase the Company’s securities, pay dividends or make restricted payments in the event of a transaction that substantially increases the Company’s level of indebtedness. The 2022 Indenture provides for customary events of default. In the case of an event of default with respect to the 2022 Convertible Notes arising from specified events of bankruptcy or insolvency, all outstanding 2022 Convertible Notes will become due and payable immediately without further action or notice. If any other event of default with respect to the 2022 Convertible Notes under the 2022 Indenture occurs or is continuing, the Trustee or holders of at least 25% in aggregate principal amount of the then outstanding 2022 Convertible Notes may declare the principal amount of the 2022 Convertible Notes to be immediately due and payable. Notwithstanding the foregoing, the 2022 Indenture provides that, upon the Company’s election, and for up to 180 days, the sole remedy for an event of default relating to certain failures by the Company to comply with certain reporting covenants in the 2022 Indenture consists exclusively of the right to receive additional interest on the 2022 Convertible Notes.

In accordance with accounting guidance for debt with conversion and other options, the Company separately accounted for the liability and equity components of the 2022 Convertible Notes by allocating the proceeds between the liability component and the embedded conversion option, or equity component, due to the Company's ability to settle the 2022 Convertible Notes in cash, its Class A Common Stock, or a combination of cash and Class A Common Stock at the option of the Company. The carrying amount of the liability component was calculated by measuring the fair value of a similar liability that does not have an associated conversion feature. The equity component of the 2022 Convertible Notes was recognized as a debt discount and represents the difference between the gross proceeds from the issuance of the 2022 Convertible Notes and the fair value of the liability component of the 2022 Convertible Notes on their respective dates of issuance. The debt discount is amortized to interest expense using the effective interest method over seven years, or the expected life of the 2022 Convertible Notes. The equity component is not remeasured as long as it continues to meet the conditions for equity classification.

In connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes in August 2019, the Company repurchased $215.0 million aggregate principal amount of the 2022 Convertible Notes. The 2022 Convertible Notes were repurchased at a premium totaling approximately $227.3 million. The Company recognized a loss on extinguishment of debt of approximately $23.4 million during the year ended December 31, 2019 related to the prepayment premium and proportional write-off of the 2022 Convertible Notes unamortized debt issuance costs and unamortized debt discount. Additionally, the repurchase resulted in a reduction to additional paid-in capital of approximately $27.0 million during the year ended December 31, 2019 related to the equity component of the 2022 Convertible Notes.

0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026

In August 2019, the Company issued $200.0 million aggregate principal amount of the 2024 Convertible Notes and $200.0 million aggregate principal amount of the 2026 Convertible Notes. The Company received net proceeds of approximately $391.0 million from the sale of the 2024 Convertible Notes and 2026 Convertible Notes, after deducting fees and expenses of approximately $9.0 million. The Company used approximately $25.2 million of the net proceeds from the sale of the 2024 Convertible Notes and 2026 Convertible Notes to pay the cost of the Capped Calls, as

described below. For purposes of this section, “Notes” refer to the 2024 Convertible Notes and the 2026 Convertible Notes, collectively.

The 2024 Convertible Notes and 2026 Convertible Notes were issued by the Company on August 12, 2019, pursuant to separate Indentures, each dated as of such date (each an “Indenture” and together the “Indentures”), between the Company and the Trustee. The 2024 Convertible Notes bear cash interest at the annual rate of 0.75% and the 2026 Convertible Notes bear cash interest at the annual rate of 1.50%, each payable on June 15 and December 15 of each year. The 2024 Convertible Notes will mature on June 15, 2024 and the 2026 Convertible Notes will mature on June 15, 2026, unless earlier converted or repurchased. The Company will settle conversions of the 2024 Convertible Notes and 2026 Convertible Notes through payment or delivery, as the case may be, of cash, shares of the Company’s Class A Common Stock or a combination of cash and shares of Class A Common Stock, at the Company’s option (subject to, and in accordance with, the settlement provisions of the applicable Indenture). The initial conversion rate for each of the 2024 Convertible Notes and the 2026 Convertible Notes is 74.6687 shares of Class A Common Stock (subject to adjustment as provided for in the applicable Indenture) per $1,000 principal amount of the 2024 Convertible Notes and 2026 Convertible Notes, which is equal to an initial conversion price of approximately $13.39 per share.

Holders of the 2024 Convertible Notes and 2026 Convertible Notes may convert their Notes at their option at any time prior to the close of business on the business day immediately preceding December 15, 2023, with respect to the 2024 Convertible Notes, and December 15, 2025, with respect to the 2026 Convertible Notes, in multiples of $1,000 principal amount, only under the following circumstances:

● during any calendar quarter commencing after the calendar quarter ending on December 31, 2019 (and only during such calendar quarter), if the last reported sale price of Class A Common Stock for at least 20 trading days (whether or not consecutive) during a period of 30 consecutive trading days ending on the last trading day of the immediately preceding calendar quarter is greater than or equal to 130% of the conversion price for the Notes on each applicable trading day;

● during the five business day period after any five consecutive trading day period (the “measurement period”) in which the “trading price” (as defined in each Indenture) per $1,000 principal amount of Notes for each trading day of the measurement period was less than 98% of the product of the last reported sale price of Class A Common Stock and the conversion rate for the Notes on each such trading day; or

● upon the occurrence of specified corporate events described in each Indenture.

On or after December 15, 2023, with respect to the 2024 Convertible Notes, and December 15, 2025, with respect to the 2026 Convertible Notes, until the close of business on the second scheduled trading day immediately preceding the applicable maturity date, the holders of the Notes may convert their Notes, in multiples of $1,000 principal amount, regardless of the foregoing conditions.

If the Company experiences a fundamental change, as described in the Indentures, prior to the maturity date of the respective Notes, holders of such Notes will, subject to specified conditions, have the right, at their option, to require the Company to repurchase for cash all or a portion of their Notes at a repurchase price equal to 100% of the principal amount of the Notes to be repurchased, plus accrued and unpaid interest, if any, to, but not including, the fundamental change repurchase date. If a make-whole fundamental change, as described in the Indentures, occurs and a holder elects to convert its Notes in connection with such make-whole fundamental change, such holder may be entitled to an increase in the conversion rate as described in the Indentures.

The Indentures do not contain any financial covenants or restrict the Company’s ability to repurchase the Company’s securities, pay dividends or make restricted payments in the event of a transaction that substantially increases the Company’s level of indebtedness. The Indentures provide for customary events of default. In the case of an event of default with respect to a series of Notes arising from specified events of bankruptcy or insolvency, all outstanding Notes of such series will become due and payable immediately without further action or notice. If any other event of default with respect to a series of Notes under the relevant Indenture occurs or is continuing, the Trustee or holders of at least 25% in aggregate principal amount of the then outstanding Notes of such series may declare the principal amount of such Notes to be immediately due and payable.

In accordance with accounting guidance for debt with conversion and other options, the Company separately accounted for the liability and equity components of the 2024 Convertible Notes and the 2026 Convertible Notes by allocating the proceeds between the liability components and the embedded conversion options, or equity components, due to the Company’s ability to settle the 2024 Convertible Notes and the 2026 Convertible Notes in cash, its Class A Common Stock, or a combination of cash and Class A Common Stock at the option of the Company. The carrying amount of the respective liability components were calculated by measuring the fair value of a similar liability that does not have an associated conversion feature. The respective equity components of the 2024 Convertible Notes and the 2026 Convertible Notes were recognized as a debt discount and represent the difference between the gross proceeds from the issuance of the 2024 Convertible Notes and 2026 Convertible Notes and the fair value of the liability of the 2024 Convertible Notes and 2026 Convertible Notes on their respective dates of issuance. The debt discount is amortized to interest expense using the effective interest method over approximately five and seven years, or the expected life of the 2024 Convertible Notes and the 2026 Convertible Notes, respectively. The respective equity components are not remeasured as long as they continue to meet the conditions for equity classification.

The Company’s outstanding balances for the convertible senior notes as of December 31, 2020 and 2019 consisted of the following (in thousands):

	December 31,
	2020		2019
Liability component:
Principal:
2022 Convertible Notes	$	120,699	$	120,699
2024 Convertible Notes		200,000		200,000
2026 Convertible Notes		200,000		200,000
Less: unamortized debt discount		(83,900)		(104,700)
Less: unamortized debt issuance costs		(6,543)		(8,005)
Net carrying amount	$	430,256	$	407,994
Equity component:
2022 Convertible Notes		19,807		19,807
2024 Convertible Notes		41,152		41,152
2026 Convertible Notes		51,350		51,350
Total equity component	$	112,309	$	112,309

In connection with the issuance of the 2022 Convertible Notes, the Company incurred approximately $11.7 million of debt issuance costs, which primarily consisted of initial purchasers’ discounts and legal and other professional fees. The Company allocated these costs to the liability and equity components based on the allocation of the proceeds. The portion of these costs allocated to the equity components totaling approximately $4.0 million were recorded as a reduction to additional paid-in capital upon issuance. The portion of these costs allocated to the liability components totaling approximately $7.7 million were recorded as a reduction in the carrying value of the debt on the consolidated balance sheet and are amortized to interest expense using the effective interest method over the expected life of the 2022 Convertible Notes. In connection with the partial repurchase of the 2022 Convertible Notes, the Company recorded a loss on extinguishment of debt of approximately $23.4 million, of which approximately $2.8 million related to the initial debt issuance costs, during the year ended December 31, 2019.

The Company determined the expected life of the 2022 Convertible Notes was equal to their seven-year term. The effective interest rate on the liability components of the 2022 Convertible Notes for the period from the date of issuance through June 30, 2019 was 9.34%. From the date of the partial repurchase of the 2022 Convertible Notes in August 2019 through December 31, 2020, the effective interest rate on the liability component of the 2022 Convertible Notes was 9.7%.

In connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company incurred approximately $9.0 million of debt issuance costs, which primarily consisted of initial purchaser’s discounts and legal and other professional fees. The Company allocated these costs to the liability and equity components based on the allocation of the proceeds. The portion of these costs allocated to the equity components totaling approximately $2.1 million were recorded as a reduction to additional paid-in capital. The portion of these costs allocated to the liability components totaling approximately $6.9 million were recorded as a reduction in the carrying value of the debt on the

consolidated balance sheet and are amortized to interest expense using the effective interest method over the expected lives of the 2024 Convertible Notes and the 2026 Convertible Notes.

The Company determined the expected life of the 2024 Convertible Notes and the 2026 Convertible Notes was equal to their approximately five and seven-year terms, respectively. The effective interest rates on the liability components of the 2024 Convertible Notes and the 2026 Convertible Notes for the period from the date of issuance through December 31, 2020 was 6.3% and 6.6%, respectively.

The following table sets forth total interest expense recognized related to convertible senior notes during the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Contractual interest expense	$	7,216	$	7,361	$	7,553
Amortization of debt issuance costs		1,462		1,190		971
Amortization of debt discount		20,800		17,683		15,437
Total interest expense	$	29,478	$	26,234	$	23,961

Future minimum payments under the convertible senior notes as of December 31, 2020, are as follows (in thousands):

2021	$	7,216
2022		126,557
2023		4,500
2024		203,750
2025		3,000
2026		201,500
Total future minimum payments under the convertible senior notes		546,523
Less: amounts representing interest		(25,824)
Less: unamortized debt discount		(83,900)
Less: unamortized debt issuance costs		(6,543)
Convertible senior notes balance	$	430,256

Convertible Note Hedge and Note Hedge Warrant Transactions with Respect to 2022 Convertible Notes

To minimize the impact of potential dilution to the Company's Class A common stockholders upon conversion of the 2022 Convertible Notes, the Company entered into the Convertible Note Hedges covering 20,249,665 shares of the Company’s Class A Common Stock in connection with the issuance of the 2022 Convertible Notes. The Convertible Note Hedges had an initial exercise price of $16.58 per share, subject to adjustment upon the occurrence of certain corporate events or transactions, and are exercisable if the 2022 Convertible Notes are converted. In connection with the adjustment to the conversion rate of the 2022 Convertible Notes related to the Separation in April 2019, the exercise price of the Convertible Note Hedges was adjusted to $14.51 per share and the number of shares underlying the Convertible Note Hedges was increased to 23,135,435 shares. If upon conversion of the 2022 Convertible Notes, the price of the Company’s Class A Common Stock is above the exercise price of the Convertible Note Hedges, the counterparties are obligated to deliver shares of the Company’s Class A Common Stock and/or cash with an aggregate value approximately equal to the difference between the price of the Company’s Class A Common Stock at the conversion date and the exercise price, multiplied by the number of shares of the Company’s Class A Common Stock related to the Convertible Note Hedge being exercised.

Concurrently with entering into the Convertible Note Hedges, the Company sold Note Hedge Warrants to the Convertible Note Hedge counterparties to acquire 20,249,665 shares of the Company’s Class A Common Stock, subject to customary anti-dilution adjustments. The strike price of the Note Hedge Warrants was initially $21.50 per share, subject to adjustment, and such warrants are exercisable over the 150 trading day period beginning on September 15, 2022. In connection with the Separation in April 2019, the exercise price was adjusted to $18.82 per share and the number of shares underlying the Note Hedge Warrants was increased to 23,135,435 shares. The Note Hedge Warrants

could have a dilutive effect on the Class A Common Stock to the extent that the market price per share of the Company’s Class A Common Stock exceeds the applicable strike price of such warrants.

The Convertible Note Hedges and the Note Hedge Warrants are separate transactions entered into by the Company and are not part of the terms of the 2022 Convertible Notes. Holders of the Convertible Note Hedges and the Note Hedge Warrants do not have any rights with respect to the 2022 Convertible Notes. The Company paid approximately $91.9 million for the Convertible Note Hedges and received approximately $70.8 million for the Note Hedge Warrants, resulting in a net cost to the Company of approximately $21.1 million.

In August 2019, concurrently with the repurchase of $215.0 million aggregate principal amount of the 2022 Convertible Notes, the Company terminated the respective portion of the Convertible Note Hedges and Note Hedge Warrants. The Company received approximately $3.2 million of termination payments from the counterparties of the Convertible Note Hedges and Note Hedge Warrants.

The Convertible Note Hedges and Note Hedge Warrants are accounted for as derivative assets and liabilities, respectively, in accordance with ASC 815, and are remeasured to fair value at each reporting date (Note 7).

Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes

To minimize the impact of potential dilution to the Company’s Class A common stockholders upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into separate Capped Calls in connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes. The Company paid the counterparties approximately $25.2 million to enter into the Capped Calls.

The Capped Calls have an initial strike price of approximately $13.39 per share, which corresponds to the initial conversion price of the 2024 Convertible Notes and the 2026 Convertible Notes and is subject to anti-dilution adjustments generally similar to those applicable to the 2024 Convertible Notes and the 2026 Convertible Notes. The Capped Calls have a cap price of approximately $17.05 per share, subject to certain adjustments. The Capped Calls cover 29,867,480 shares of Class A Common Stock (subject to anti-dilution and certain other adjustments), which is the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes.

The Capped Calls are expected generally to reduce the potential dilution to the Class A Common Stock upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes in the event that the market price per share of Class A Common Stock is greater than the strike price of the Capped Calls as adjusted pursuant to the anti-dilution adjustments. If, however, the market price per share of Class A Common Stock exceeds the cap price of the Capped Calls, there would nevertheless be dilution upon conversion of the 2024 Convertible Notes and the 2026 Convertible Notes to the extent that such market price exceeds the cap price of the Capped Calls.

The Capped Calls are separate transactions entered into by and between the Company and the Capped Calls counterparties and are not part of the terms of the 2024 Convertible Notes or the 2026 Convertible Notes. Holders of the 2024 Convertible Notes and the 2026 Convertible Notes do not have any rights with respect to the Capped Calls. The Company recorded a reduction to additional paid-in capital of approximately $25.0 million during the year ended December 31, 2019 related to the premium payments for the Capped Calls. Additionally, the Company recorded an approximately $0.2 million reduction to equity related to transaction costs incurred in connection with the Capped Calls during the year ended December 31, 2019. These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met.

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Commitments and Contingencies

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Commitments and Contingencies

12. Commitments and Contingencies

Commitments with AbbVie

The Company and AbbVie are jointly obligated to make minimum purchases of linaclotide API for the territories covered by the Company’s collaboration with AbbVie for North America. Currently, AbbVie fulfills all such minimum purchase commitments.

Under the collaboration agreement with AbbVie for North America, the Company shares all development and commercialization costs related to linaclotide in the U.S. with AbbVie. The actual amounts that the Company pays to AbbVie or that AbbVie pays to the Company will depend on numerous factors outside of the Company’s control, including the success of certain clinical development efforts with respect to linaclotide, the content and timing of decisions made by the regulators, the reimbursement and competitive landscape around linaclotide and the Company’s other product candidates, and other factors.

Other Funding Commitments

As of December 31, 2020, the Company has on-going studies in various pre-clinical and clinical trial stages. The Company’s most significant clinical trial expenditures are to contract research organizations. These contracts are generally cancellable, with notice, at the Company’s option and do not have any significant cancellation penalties.

Guarantees

As permitted under Delaware law, the Company indemnifies its directors and certain of its officers for certain events or occurrences while such director or officer is, or was, serving at the Company’s request in such capacity. The maximum potential amount of future payments the Company could be required to make is unlimited; however, the Company has directors’ and officers’ insurance coverage that is intended to limit its exposure and enable it to recover a portion of any future amounts paid.

The Company enters into certain agreements with other parties in the ordinary course of business that contain indemnification provisions. These typically include agreements with business partners, contractors, landlords, clinical sites and customers. Under these provisions, the Company generally indemnifies and holds harmless the indemnified party for losses suffered or incurred by the indemnified party as a result of the Company’s activities. These indemnification provisions generally survive termination of the underlying agreements. The maximum potential amount of future payments the Company could be required to make under these indemnification provisions is unlimited. However, to date the Company has not incurred material costs to defend lawsuits or settle claims related to these indemnification provisions. As a result, the estimated fair value of these obligations is minimal. Accordingly, the Company did not have any liabilities recorded for these obligations as of December 31, 2020 and 2019.

Litigation

From time to time, the Company is involved in various legal proceedings and claims, either asserted or unasserted, which arise in the ordinary course of business. While the outcome of these other claims cannot be predicted with certainty, management does not believe that the outcome of any of these ongoing legal matters, individually and in aggregate, will have a material adverse effect on the Company’s consolidated financial statements.

In January 2020, the Company and AbbVie entered into settlement agreements with Sandoz Inc. and Teva Pharmaceuticals, USA resolving patent litigation brought in response to the last outstanding abbreviated new drug applications seeking approval to market generic versions of LINZESS prior to the expiration of the Company’s and AbbVie’s applicable patents.

In connection with litigation settlements the Company entered into in 2018, the Company agreed to pay an aggregate of $4.0 million in avoidance of litigation fees and expenses during the year ended December 31, 2018.

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Stockholders' Equity

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Stockholders' Equity

13. Stockholders’ Equity

Preferred Stock

The Company’s preferred stock may be issued from time to time in one or more series, with each such series to consist of such number of shares and to have such terms as adopted by the board of directors. Authority is given to the board of directors to determine and fix such voting powers, full or limited, or no voting powers, and such designations, preferences and relative participating, optional or other special rights, and qualifications, limitation or restrictions thereof, including without limitation, dividend rights, conversion rights, redemption privileges and liquidation preferences.

Common Stock

The Company has one class of common stock (“Class A Common Stock”). Class A Common Stock is entitled to one vote per share. The Company has reserved, out of its authorized but unissued shares of Class A Common Stock, sufficient shares to effect the conversion of the convertible senior notes and the Note Hedge Warrants pursuant to the terms thereof (Note 11).

The Company’s shareholders are entitled to dividends if and when declared by the board of directors.

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Employee Stock Benefit Plans

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Employee Stock Benefit Plans

14. Employee Stock Benefit Plans

The Company has several share-based compensation plans under which stock options, RSAs, RSUs, and other share-based awards are available for grant to employees, officers, directors and consultants of the Company.

The following table summarizes share-based compensation expense by award type (in thousands):

	Year Ended December 31,
	2020		2019		2018
Stock options	$	7,680	$	12,526	$	20,478
Time-based restricted stock units		18,624		15,488		17,160
Performance-based restricted stock units		2,190		—		—
Restricted stock awards		1,886		2,095		2,330
Employee stock purchase plan		722		1,115		1,097
Stock awards		73		54		17
	$	31,175	$	31,278	$	41,082

The following table summarizes the share-based compensation expense reflected in the consolidated statements of operations (in thousands):

	Years Ended December 31,
	2020		2019		2018
Research and development	$	5,569	$	6,343	$	11,500
Selling, general and administrative		23,825		24,281		27,440
Restructuring expenses		1,781		654		2,142
	$	31,175	$	31,278	$	41,082

Restructuring expenses include modifications to share-based awards held by employees impacted by the various workforce reductions (Note 18).

In April 2019, in connection with the Separation, all outstanding share-based payment awards were modified in accordance with the equity conversion-related provisions of the employee matters agreement with Cyclerion. No share-based compensation expense was recognized in connection with these modifications. Additionally, modifications with respect to the Company’s ESPP were made due to the change in share price as a result of the Separation. As a result of the modification to the ESPP, the Company recorded approximately $0.3 million of share-based compensation expense for the year ended December 31, 2019.

In connection with certain other modifications of share-based payment awards for the years ended December 31, 2020 and 2019, the Company recognized an insignificant amount and approximately $3.0 million in share-based compensation expense, respectively.

Stock Benefit Plans

As of December 31, 2020, the Company has the following active stock benefit plans pursuant to which awards are currently outstanding: the 2019 Equity Incentive Plan (the “2019 Equity Plan”), the Amended and Restated 2010 Employee Stock Purchase Plan (the “2010 Purchase Plan”) and the Amended and Restated 2010 Employee, Director, and Consultant Equity Incentive Plan (the “2010 Equity Plan”). At December 31, 2020, there were 14,357,176 shares available for future grant under the 2019 Equity Plan and the 2010 Purchase Plan.

2019 Equity Plan

During 2019, the Company’s stockholders approved the 2019 Equity Plan under which stock options, RSAs, RSUs, and other stock-based awards may be granted to employees, officers, directors, or consultants of the Company. Under the 2019 Equity Plan, 10,000,000 shares of Class A Common Stock were initially reserved for issuance. Awards that are returned to the 2010 Equity Plan as a result of their expiration, cancellation, termination or repurchase are automatically made available for issuance under the 2019 Equity Plan. Awards that expire, cancel, terminate, or are repurchased under the 2019 Equity Plan will no longer be available for future grant. As of December 31, 2020, 9,651,783 shares were available for future grant under the 2019 Equity Plan.

2010 Purchase Plan

During 2010, the Company’s stockholders approved the 2010 Purchase Plan, which gives eligible employees the right to purchase shares of common stock at the lower of 85% of the fair market value on the first or last day of an offering period. Each offering period is six months. There were 400,000 shares of common stock initially reserved for issuance pursuant to the 2010 Purchase Plan. The number of shares available for future grant under the 2010 Purchase Plan may be increased on the first day of each fiscal year by an amount equal to the lesser of: (i) 1,000,000 shares, (ii) 1% of the Class A shares of common stock outstanding on the last day of the immediately preceding fiscal year, or (iii) such lesser number of shares as is determined by the board of directors. As of December 31, 2020, there were 4,705,393 shares available for future grant under the 2010 Purchase Plan.

2010 Equity Plan

The 2010 Equity Plan provided for the granting of stock options, RSAs, RSUs, and other share-based awards to employees, officers, directors, consultants, or advisors of the Company. At December 31, 2020, there were no shares available for future grant under the 2010 Equity Plan.

Restricted Stock Awards

RSAs are granted to non-employee members of the board of directors under restricted stock agreements in accordance with the terms of the 2019 Equity Plan and the Company’s non-employee director compensation policy, effective May 2019. Annual restricted stock grants to each non-employee member of the board of directors vest ratably over the period of service from the grant date through the Company’s 2021 annual meeting of stockholders, provided the individual continues to serve on the Company’s board of directors through each vest date. Initial restricted stock grants to new non-employee members of the board of directors vest annually over a three-year period from the date of grant provided the individual continues to serve on the Company’s board of directors through each vest date.

A summary of restricted stock activity for the year ended December 31, 2020 is presented below:

		Weighted-
		Average
	Number of	Grant Date
	Shares	Fair Value
Unvested as of December 31, 2019	181,648	$	10.76
Granted	246,500		10.16
Vested	(181,648)		10.46
Forfeited	—		—
Unvested as of December 31, 2020	246,500	$	10.38

The weighted-average grant date fair value per share of restricted stock awards granted during the years ended December 31, 2020, 2019, and 2018 was $10.16, $10.96, and $18.58, respectively. Amounts relating to restricted stock awards granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the Company’s stock price.

Restricted Stock Units

RSUs granted under the Company’s equity plans represent the right to receive one share of the Company’s Class A Common Stock pursuant to the terms of the applicable award agreement. Shares of the Company’s Class A Common Stock are delivered to the employee upon vesting, subject to payment of applicable withholding taxes.

Time-based RSUs

Time-based RSUs generally vest over a two-to-four-year period on the approximate anniversary of the date of grant until fully vested, provided the individual remains in continuous service with the Company through each vesting date. The fair value of all time-based RSUs is based on the market value of the Company's Class A Common Stock on the date of grant. Compensation expense, including the effect of estimated forfeitures, is recognized over the applicable service period.

A summary of time-based RSU activity for the year ended December 31, 2020 is as follows:

		Weighted-
		Average
	Number	Grant Date
	of RSUs	Fair Value
Outstanding as of December 31, 2019	3,207,089	$	12.33
Granted	2,708,200		11.59
Vested and released	(965,625)		12.37
Forfeited	(779,038)		11.96
Outstanding as of December 31, 2020	4,170,626	$	11.90

The weighted-average grant date fair value per share of time-based RSUs granted during the years ended December 31, 2020, 2019, and 2018 was $11.59, $12.11, and $15.63, respectively. Amounts relating to time-based RSUs granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the Company’s stock price.

Performance-based RSUs

Performance-based RSUs (“PSUs”) were granted to certain executives in 2020. PSUs vest upon the achievement of specified performance criteria over a two to three-year performance period, generally subject to the executive remaining in continuous service with the Company through the applicable vesting dates. The performance criteria applicable to the PSUs were (i) gaining the U.S. FDA’s acceptance of one or more additional New Drug Applications through internal development or acquisition of development-stage or commercial-stage programs (“Pipeline PSUs”), (ii) achieving certain profitability metrics (“Profitability PSUs”) and (iii) realizing relative total shareholder return goals (the “Relative TSR PSUs”).

The fair value of Pipeline PSUs and Profitability PSUs is based on the market value of the Company's Class A Common Stock on the date of grant. The Relative TSR PSUs are valued using the Monte Carlo simulation method on the date of grant. The weighted average assumptions used to estimate the fair value of Relative TSR PSUs were as follows for the year ended December 31, 2020:

	Year Ended December 31,
	2020
Fair value of common stock	$ 11.78
Expected volatility	53.3	%
Expected term (in years)	2.8
Risk-free interest rate	1.0	%
Expected dividend yield	—	%

A summary of PSU activity for the year ended December 31, 2020 is as follows:

		Weighted-
		Average
	Number	Grant Date
	of RSUs	Fair Value(1)
Outstanding as of December 31, 2019	—	$	—
Granted	586,157		12.48
Vested and released	—		—
Forfeited	—		—
Outstanding as of December 31, 2020	586,157	$	12.48

No PSUs were granted prior to the year ended December 31, 2020.

Stock Options

Stock options granted under the Company’s equity plans represent the right to purchase one share of the Company’s Class A Common Stock pursuant to the terms of the applicable award agreement. Shares of the Company's Class A Common Stock are delivered to the employee upon exercise, subject to payment of applicable withholding taxes.

As of April 2020, the Company no longer grants stock options. Stock options previously granted under the Company’s equity plans generally have a ten-year term and vest over a period of four years, provided the individual continues to serve at the Company through the vesting dates. Options granted under all equity plans are exercisable at a price per share not less than the fair market value of the underlying common stock on the date of grant. The estimated fair value of options, including the effect of estimated forfeitures, is recognized over the requisite service period, which is typically the vesting period of each option.

The weighted average assumptions used to estimate the fair value of the stock options using the Black-Scholes option-pricing model were as follows for the years ended December 31, 2020, 2019, and 2018:

	Years Ended December 31,
	2020		2019		2018
Expected volatility	46.6	%	46.3	%	43.7	%
Expected term (in years)	6.1		6.1		6.0
Risk-free interest rate	1.5	%	2.5	%	2.7	%
Expected dividend yield	—	%	—	%	—	%

Expected volatility is based on the historical volatility of the Company’s Class A Common Stock. The Company estimates the expected term using historical data. The risk-free interest rate used for each grant is based on a zero-coupon U.S. Treasury instrument with a remaining term similar to the expected term of the share-based award. The

Company has not paid and does not anticipate paying cash dividends on its shares of common stock in the foreseeable future; therefore, the expected dividend yield is assumed to be zero.

The weighted-average grant date fair value per share of options granted during the years ended December 31, 2020, 2019, and 2018 was $5.89, $6.10, and $6.81, respectively. Amounts relating to stock options granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the Company’s stock price.

The Company historically granted to certain employees performance-based options to purchase shares of common stock. These options are subject to performance-based milestone vesting. During the years ended December 31, 2020 and 2019, there were no shares that vested as a result of performance milestone achievements. The Company recorded no share-based compensation expense related to these performance-based options during each of the years ended December 31, 2020, 2019, and 2018.

The following table summarizes stock option activity under the Company’s share-based compensation plans, including performance-based options:

		Weighted-		Weighted-
	Number of	Average		Average	Aggregate
	Stock	Exercise		Contractual	Intrinsic
	Options	Price(1)		Life	Value
				(in years)	(in thousands)
Outstanding at December 31, 2019	17,194,239	$	12.13	5.11	$	25,226
Granted	55,000		12.84	—		—
Exercised	(1,735,081)		10.21	—		—
Cancelled	(2,054,487)		13.00	—		—
Outstanding at December 31, 2020	13,459,671		12.25	4.27		5,613
Vested or expected to vest at December 31, 2020	13,280,456		12.26	4.23		5,575
Exercisable at December 31, 2020	11,963,812		12.26	3.90		5,371

(1) Exercise prices relating to stock options granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the stock options.

The total intrinsic value of options exercised during the years ended December 31, 2020, 2019, and 2018 was approximately $3.5 million, approximately $5.1 million, and approximately $20.1 million, respectively. The intrinsic value was calculated as the difference between the fair value of the Company’s Class A Common Stock and the exercise price of the option issued.

The following table sets forth the Company's unrecognized share-based compensation expense, net of estimated forfeitures, as of December 31, 2020, by type of award and the weighted-average period over which that expense is expected to be recognized:

	Unrecognized		Weighted-Average
	Expense, Net		Remaining
	of Estimated		Recognition
	Forfeitures		Period
	(in thousands)		(in years)
Type of award:
Stock options with time-based vesting	$	6,557	1.84
Restricted stock awards		1,473	0.92
Time-based restricted stock units		26,934	2.22
Performance-based restricted stock units		3,291	1.70
Stock options with time-based and performance-based vesting (1)		88	—

(1) The weighted-average remaining recognition period cannot be determined for performance-based or time-accelerated options due to the nature of such awards, as detailed above.

The total unrecognized share-based compensation cost will be adjusted for future changes in estimated forfeitures.

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Income Taxes

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Income Taxes

15. Income Taxes

During the year ended December 31, 2020, the Company recorded approximately $2.7 million in income tax expense related to state income tax, which primarily resulted from a change in California tax which temporarily disallows the use of net operating losses to offset taxable income. The Company did not record a provision for federal income taxes for the period ended December 31, 2020, as it offset taxable income with federal net operating losses and continues to record a full valuation allowance against net deferred tax assets. The Company did not record a provision for federal, state, or foreign income taxes for the period ended December 31, 2019 and 2018, respectively, because the Company incurred a tax loss during these years and offset the benefit of these tax losses with valuation allowance. The Company has not recorded a foreign tax provision as it has had cumulative net operating losses outside of the United States since inception.

On March 27, 2020. the Coronavirus Aid, Relief, and Economic Security (“CARES”) Act was enacted and signed into law. The Company benefitted from certain provisions of the CARES Act, specifically, the increase in allowable business interest deduction from 30% of adjusted taxable income to 50% of adjusted taxable income, which allowed the Company to take additional interest deductions for the period ended December 31, 2020. Additionally, the Company was able to claim 100% bonus depreciation on leasehold improvements incurred in the period ended December 31, 2019 and 2020.

A reconciliation of income taxes computed using the U.S. federal statutory rate of 21% to that reflected in the consolidated statements of operations are as follows (in thousands):

	Year Ended December 31,
	2020		2019		2018
Income tax benefit using U.S. federal statutory rate	$	22,861	$	4,517	$	(59,297)
Permanent differences		74		65		218
State income taxes, net of federal benefit		7,565		(1,902)		(17,121)
Disallowed Separation related costs		—		4,658		—
Executive compensation - Section 162(m)		1,718		662		8
Meals and entertainment		395		495		995
Non-deductible share-based compensation		(144)		(1,202)		(494)
Excess tax benefits		5,132		3,324		(1,223)
Fair market valuation of Note Hedge Warrants and Convertible Note Hedges		1,680		(290)		2,367
Tax credits		(3,149)		(4,374)		(7,863)
Expiring net operating losses and tax credits		1,991		3,764		250
Effect of change in state tax rate on deferred tax assets and deferred tax liabilities		(208)		(2,563)		1,476
Change in the valuation allowance		(35,230)		(7,154)		80,684
Income tax expense	$	2,685	$	—	$	—

Deferred tax assets and liabilities were determined based on the difference between financial statement and tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The components of the Company’s deferred tax assets and liabilities are as follows (in thousands):

	December 31,
	2020		2019
Deferred tax assets:
Net operating loss carryforwards	$	234,772	$	265,494
Tax credit carryforwards		60,607		59,892
Capitalized research and development		7,498		9,952
Share-based compensation		21,848		24,401
Basis difference on collaboration agreement for North America with AbbVie		62,629		48,594
Accruals and reserves		6,114		6,415
Basis difference on 2022 Convertible Notes		6,183		4,322
Interest expense		3,386		22,020
Operating lease liability		6,504		6,421
Other		5,049		5,295
Total deferred tax assets		414,590		452,806
Deferred tax liabilities:
Basis difference on 2024 Convertible Notes		(5,951)		(7,381)
Basis difference on 2026 Convertible Notes		(9,022)		(10,276)
Operating lease right-of-use assets		(4,603)		(4,905)
Total deferred tax liabilities		(19,576)		(22,562)
Net deferred tax asset		395,014		430,244
Valuation allowance		(395,014)		(430,244)
Net deferred tax asset	$	—	$	—

On a periodic basis, the Company reassesses the valuation allowance on its deferred income tax assets weighing positive and negative evidence to assess the recoverability of the deferred tax assets. Management evaluated the positive evidence, including income during the year ended December 31, 2020, and negative evidence, including its cumulative losses in recent years and its plan to build its innovative GI pipeline through potential acquisition or in-licensing externally development products, and concluded that it is more likely than not that the Company will not realize the benefit of its deferred tax assets for the year ended December 31, 2020. Accordingly, the net deferred tax assets have been fully offset by a valuation allowance as of December 31, 2020 and 2019. Management re-evaluates the positive and negative evidence on a quarterly basis. Based on the Company’s financial performance and its future projections, it may record a reversal of all, or a portion of the valuation allowance associated with its deferred tax assets in future periods. However, any such change is subject to actual performance and other considerations that may present positive or negative evidence at the time of the assessment. The Company’s total deferred tax asset balance subject to a valuation allowance was $395.0 million and approximately $430.2 million as of December 31, 2020 and 2019, respectively.

The valuation allowance decreased approximately $35.2 million during the year ended December 31, 2020 primarily due to the Company’s offsetting taxable income with previously disallowed interest expense and net operating losses, partially offset by an increase in deferred tax asset for the basis difference of the collaboration agreement for North America with AbbVie.

The valuation allowance decreased approximately $29.1 million during the year ended December 31, 2019 primarily due to establishment of a deferred tax liability for a basis difference in the 2024 Convertible Notes and 2026 Convertible Notes, partially offset by an increase in the deferred tax asset for temporarily disallowed interest expense.

Subject to the limitations described below, at December 31, 2020, the Company had federal net operating loss carryforwards of approximately $1.1 billion of which approximately $1.0 billion is subject to an expiration between 2021 and 2037 and $0.1 billion may be carried forward indefinitely. As of December 31, 2020, the Company had state net operating loss carryforwards of approximately $0.9 billion to offset future state taxable income, which is subject to expiration between 2021 and 2039. The Company also had tax credit carryforwards of approximately $65.3 million as of December 31, 2020 to offset future federal and state income taxes, which is subject to expiration at various times through 2040.

Utilization of net operating loss carryforwards and research and development credit carryforwards may be subject to a substantial annual limitation due to ownership change limitations that could occur in the future in accordance with Section 382 of the Internal Revenue Code of 1986 (“IRC Section 382”) and with Section 383 of the Internal Revenue Code of 1986, as well as similar state provisions. These ownership changes may limit the amount of net operating loss carryforwards and research and development credit carryforwards that can be utilized annually to offset future taxable income and taxes, respectively. In general, an ownership change, as defined by IRC Section 382, results from transactions increasing the ownership of certain stockholders or public groups in the stock of a corporation by more than 50 percentage points over a three-year period.

The following table summarizes the changes in the Company’s unrecognized income tax benefits for the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Balance at the beginning of the period	$	53,099	$	38,551	$	24,078
Increases based on tax positions related to the current period		66,687		51,699		38,551
Increases for tax positions related to prior periods		—		1,400		—
Decreases for tax positions in prior periods		(51,699)		(38,551)		(24,078)
Balance at the end of the period	$	68,087	$	53,099	$	38,551

The Company had gross unrecognized tax benefits of approximately $68.1 million, approximately $53.1 million, and approximately $38.6 million as of December 31, 2020, 2019 and 2018, respectively. Of the approximately $68.1 million of total unrecognized tax benefits at December 31, 2020, approximately $0.8 million would, if recognized, affect the Company’s effective tax rate, and the remaining amount would not affect the Company’s effective tax rate due to a valuation allowance against the Company’s net deferred tax assets. A reserve for uncertain tax positions of approximately $0.8 million is recorded in other liabilities on the Company’s consolidated balance sheet as of December 31, 2020.

The Company will recognize interest and penalties, if any, related to uncertain tax positions in income tax expense. As of December 31, 2020, no interest or penalties have been accrued.

The statute of limitations for assessment by the Internal Revenue Service (“IRS”) and state tax authorities is open for tax years ended December 31, 2017 through the present, although net operating losses generated from years prior to 2017 could be subject to examination and adjustments to the extent utilized in future years. There are currently no federal or state income tax audits in progress.

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Defined Contribution Plan

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Defined Contribution Plan

16. Defined Contribution Plan

The Ironwood Pharmaceuticals, Inc. 401(k) Savings Plan is a defined contribution plan in the form of a qualified 401(k) plan in which substantially all employees are eligible to participate upon employment. Subject to certain IRS limits, eligible employees may elect to contribute from 1% to 100% of their compensation. Company contributions to the plan are at the sole discretion of the Company’s board of directors. Currently, the Company provides a matching contribution of 75% of the employee’s contributions, up to $6,000 annually. During the years ended December 31, 2020, 2019, and 2018, the Company recorded approximately $1.8 million, approximately $2.2 million, and approximately $3.2 million of expense related to its 401(k) company match, respectively.

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Related Party Transactions

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Related Party Transactions

17. Related Party Transactions

The Company previously reflected amounts due to and due from Allergan prior to its acquisition by AbbVie as related party accounts payable and related party accounts receivable, respectively. Following the acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company. As such, only historical amounts paid to and received from Allergan (prior to its acquisition by AbbVie) are considered related party accounts payable and related party accounts receivable, respectively. Balances of related party accounts payable and related party accounts receivable, respectively, were reported net of any balances due to or from the related party.

In connection with the Separation, the Company executed certain contracts with Cyclerion, whose President and Chief Scientific Officer at the time of the Separation became a member of the Company’s Board of Directors in April 2019 (Note 3). As of December 31, 2020, Cyclerion was no longer considered a related party.

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Workforce Reduction and Restructuring

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Workforce Reduction and Restructuring

18. Workforce Reductions and Restructuring

During the years ended December 31, 2020, 2019, and 2018 the Company recorded approximately $15.4 million, approximately $3.6 million, and approximately $14.7 million in restructuring expenses, respectively, in its consolidated statement of operations.

In January 2018, the Company commenced an initiative to evaluate the optimal mix of investments for the lesinurad franchise. As part of this effort, the Company reduced its field-based workforce by approximately 60 employees, primarily consisting of field-based sales representatives that promoted DUZALLO or ZURAMPIC in the first position. During the three months ended March 31, 2018, the Company substantially completed this reduction in field-based workforce and recorded approximately $2.4 million of severance, benefits and related costs as restructuring expenses during the year ended December 31, 2018 related to this reduction in workforce.

In June 2018, the Company determined the initial organizational designs of the two new businesses, including employees’ roles and responsibilities, in connection with the Separation. As part of this process, the Company initiated a reduction in its headquarters-based workforce by approximately 40 employees and substantially completed the reduction in its workforce during the year ended December 31, 2018. During the year ended December 31, 2018, the Company recorded approximately $4.0 million of severance, benefits and related costs as restructuring expenses related to this reduction in workforce.

In August 2018, the Company initiated a reduction in its workforce by approximately 100 employees, primarily consisting of field-based sales representatives in connection with the termination of the Lesinurad License and substantially completed the reduction in its workforce and recorded associated costs during the year ended December 31, 2018. During the years ended December 31, 2020 and 2019, the Company recorded an insignificant amount of adjustments to restructuring costs related to this workforce reduction. During the year ended December 31, 2018, the Company recorded approximately $8.3 million of restructuring expenses, including approximately $5.4 million of severance, benefits and related costs and approximately $2.9 million of contract-related costs, including the write-down of certain prepaid assets and deposits, in connection with this reduction in workforce.

In February 2019, following further analysis of the Company’s strategy and core business needs, and in an effort to further strengthen the operational efficiency of the organization, the Company commenced a reduction in workforce by approximately 35 employees, primarily based in the home office and substantially completed the reduction in its workforce and recorded associated costs during the year ended December 31, 2019. During the year ended December 31, 2019, the Company recorded approximately $3.7 million of severance, benefits and related costs as restructuring expenses related to this reduction in workforce.

In September 2020, the Company announced that one of its two identical Phase III trials evaluating IW-3718 in refractory GERD did not meet certain criteria, including the study’s primary endpoint of achieving a statistically significant improvement in heartburn severity. Based on these findings, the Company is discontinuing development of IW-3718. In connection with this decision, the Company reduced its workforce by approximately 100 full-time employees. This workforce reduction affected both field-based and home-office employees, including the relevant general and administrative support functions. The Company substantially completed the reduction in its workforce in the fourth quarter of 2020. The Company incurred approximately $15.5 million during the year ended December 31, 2020 in restructuring expenses, primarily for severance, benefits and related costs related to this reduction in force. Restructuring expenses during the year ended December 31, 2020 also included approximately $1.2 million related to the impairment of certain fixed assets as a result of the Company’s decision to discontinue IW-3718 development.

The following table summarizes the accrued liabilities activity recorded in connection with the reductions in workforce and related restructuring activities during the year ended December 31, 2020 (in thousands):

	Amounts								Amounts
	Accrued at								Accrued at
	December 31, 2019		Charges		Amount Paid		Adjustments		December 31, 2020
Employee severance, benefits and related costs
February 2019 Reduction		75		—		(75)		—		—
September 2020 Reduction		—		11,563		(661)		—		10,902
Total	$	75	$	11,563	$	(736)	$	—	$	10,902
Contract related costs
August 2018 Reduction	$	104	$	—	$	—	$	(104)	$	—
September 2020 Reduction		—		108		(103)		—		5
Total	$	104	$	108	$	(103)	$	(104)	$	5

The following table summarizes the accrued liabilities activity recorded in connection with the reductions in workforce and related restructuring activities during the year ended December 31, 2019 (in thousands):

	Amounts								Amounts
	Accrued at								Accrued at
	December 31, 2018		Charges		Amount Paid		Adjustments		December 31, 2019
Employee severance, benefits and related costs
June 2018 Reduction	$	696	$	16	$	(689)	$	(23)	$	—
August 2018 Reduction		1,756		—		(1,708)		(48)		—
February 2019 Reduction		—		3,182		(2,968)		(139)		75
Total	$	2,452	$	3,198	$	(5,365)	$	(210)	$	75
Contract related costs
August 2018 Reduction	$	433	$	—	$	(287)	$	(42)	$	104
Total	$	433	$	—	$	(287)	$	(42)	$	104

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Selected Quarterly Financial Data (Unaudited)

12 Months Ended

Dec. 31, 2018

Disclosure Text Block

Selected Quarterly Financial Data (Unaudited)

19. Selected Quarterly Financial Data (Unaudited)

The following table contains quarterly financial information for the years ended December 31, 2020 and 2019. The Company believes that the following information reflects all normal recurring adjustments necessary for a fair presentation of the information for the periods presented. The operating results for any quarter are not necessarily indicative of results for any future period.

	First		Second		Third		Fourth		Total
	Quarter		Quarter		Quarter		Quarter		Year
	(in thousands, except per share data)
2020
Total revenues (1)	$	79,943	$	89,432	$	103,468	$	116,680	$	389,523
Total cost and expenses (2)		66,716		56,719		57,852		65,296		246,583
Other expense, net (3)		(9,882)		(7,509)		(9,804)		(6,884)		(34,079)
Net income and comprehensive income		3,345		25,204		34,423		43,204		106,176
Net income per share—basic		0.02		0.16		0.22		0.27		0.67
Net income per share—diluted		0.02		0.16		0.21		0.27		0.66

	First		Second		Third		Fourth		Total
	Quarter		Quarter		Quarter		Quarter		Year
	(in thousands, except per share data)
2019
Total revenues (4)	$	68,730	$	102,215	$	131,167	$	126,301	$	428,413
Total cost and expenses (5)		85,663		80,638		65,280		76,709		308,290
Other expense, net (6)		(4,912)		(9,294)		(45,239)		(1,735)		(61,180)
Net (loss) income from continuing operations		(21,846)		12,283		20,648		47,858		58,943
Net loss from discontinued operations(7)		(37,438)		—		—		—		(37,438)
Net income (loss) and comprehensive income (loss)		(59,284)		12,283		20,648		47,858		21,505
Income per share from continuing operations, net of income taxes—basic	$	(0.14)	$	0.08	$	0.13	$	0.31	$	0.38
Income per share from continuing operations, net of income taxes—diluted		(0.14)		0.08		0.13		0.30		0.38
Net loss per share from discontinued operations—basic and diluted		(0.24)		—		—		—		(0.24)
Net income (loss) per share—basic		(0.38)		0.08		0.13		0.31		0.14
Net income (loss) per share—diluted		(0.38)		0.08		0.13		0.30		0.14

(1) Total revenues includes approximately $8.0 million of revenue from sales of linaclotide API to the Company’s linaclotide partners for the year ended December 31, 2020.

(2) Total costs and expenses includes approximately $15.4 million in restructuring expenses for the year ended December 31, 2020.

(3) Other expense, net includes approximately $6.1 million loss on fair value remeasurement of derivatives for the year ended December 31, 2020.

(4) Total revenues includes approximately $48.8 million of revenue from sales of linaclotide API to the Company’s linaclotide partners, primarily driven by the commercialization of linaclotide in Japan for the year ended December 31, 2019, as well as approximately $32.4 million related to the non-contingent payments from the Amended AstraZeneca Agreement and a $10.0 million upfront fee from the Amended Astellas License Agreement, both executed during the third quarter of 2019.

(5) Total costs and expenses includes approximately $3.6 million in restructuring expenses for the year ended December 31, 2019, as well as approximately $3.2 million related to the gain on lease modification in April 2019.

(6) Other expense, net includes approximately $31.0 million in loss on extinguishment of debt related to the partial repurchase of the 2022 Convertible Notes and the redemption of the 2026 Notes, and approximately $3.0 million gain on fair value remeasurement of derivatives for the year ended December 31, 2019.

(7) During the year ended December 31, 2019, the Company completed the Separation. Certain amounts related to Cyclerion have been reclassified as discontinued operations for the year ended December 31, 2019.

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Subsequent Events

12 Months Ended

Dec. 31, 2020

Disclosure Text Block

Subsequent Events

20. Subsequent Events

On February 4, 2021, Mark Mallon notified the Company that he is resigning from his position as Chief Executive Officer of the Company and a member of the Company’s board of directors, in each case effective March 12, 2021 (the “Transition Date”). Upon the Transition Date, Thomas McCourt, who is the President of the Company, also will become the Company’s interim Chief Executive Officer. Mr. Mallon’s resignation is not due to any disagreement with the Company on any matter relating to the Company’s operations, policies, or practices.

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Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2020

Policy Text Blocks

Principles of Consolidation

Principles of Consolidation

The accompanying consolidated financial statements include the accounts of Ironwood and its wholly-owned subsidiaries, as of December 31, 2020, Ironwood Pharmaceuticals Securities Corporation and Ironwood Pharmaceuticals GmbH. Cyclerion was a wholly-owned subsidiary until it became an independent publicly-traded company on April 1, 2019. All intercompany transactions and balances are eliminated in consolidation.

Segment Information

Segment Information

Operating segments are components of an enterprise for which separate financial information is available and is evaluated regularly by the Company’s chief operating decision-maker in deciding how to allocate resources and in assessing performance. The Company currently operates in one reportable business segment—human therapeutics.

Reclassifications

Reclassifications

Certain prior period financial statement items have been reclassified to conform to current period presentation.

Discontinued Operations

Discontinued Operations

The Company determined that its sGC business, which was disposed on April 1, 2019, met the criteria for classification as a discontinued operation in accordance with Accounting Standards Codification (“ASC”) Subtopic 205-20, Discontinued Operations (“ASC 205-20”). Accordingly, the accompanying consolidated financial statements as of and for the year ended December 31, 2019 and all prior periods present the balance sheet, operations, and cash flows associated with the sGC business as discontinued operations. For additional information related to discontinued operations, refer to Note 3, Cyclerion Separation, to these consolidated financial statements.

Use of Estimates

Use of Estimates

The preparation of consolidated financial statements in accordance with U.S. generally accepted accounting principles requires the Company’s management to make estimates and judgments that may affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the amounts of revenues and expenses during the reported periods. On an ongoing basis, the Company’s management evaluates its estimates, judgments and methodologies. Significant estimates and assumptions in the consolidated financial statements include those related to revenue recognition; accounts receivable; inventory valuation and related reserves; useful lives of long-lived assets, impairment of long-lived assets, including its acquired intangible assets and goodwill; valuation procedures for right-of-use assets and operating lease liabilities; valuation procedures for the issuance and repurchase of convertible notes; balance sheet classification of convertible notes; valuation of assets and liabilities held for disposition and losses related to discontinued operations; fair value of derivatives; income taxes, including the valuation allowance for deferred tax assets; research and development expenses; contingencies and share-based compensation. The Company bases its estimates on historical experience and on various other assumptions that are believed to be reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. Actual results may differ materially from these estimates under different assumptions or conditions. Changes in estimates are reflected in reported results in the period in which they become known.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company considers all highly liquid investment instruments with a remaining maturity when purchased of three months or less to be cash equivalents. Investments qualifying as cash equivalents primarily consist of money market funds, U.S. government-sponsored securities, and repurchase agreements. The carrying amount of cash equivalents approximates fair value. The amount of cash equivalents included in cash and cash equivalents was approximately $349.0 million and approximately $177.0 million at December 31, 2020 and 2019, respectively.

Restricted Cash

Restricted Cash

The Company is contingently liable under unused letters of credit with a bank, related to the Company’s facility lease and vehicle lease agreements, in the amount of approximately $2.2 million as of December 31, 2020 and 2019. The Company records as restricted cash the collateral used to secure these letters of credit. The amount of restricted cash included in current assets and non-current assets was approximately $1.7 million and $0.5 million at December 31, 2020, respectively. The amount of restricted cash in current assets and non-current assets was approximately $1.2 million and $1.0 million at December 31, 2019, respectively.

Concentrations of Suppliers

Concentrations of Suppliers

The Company relies on its collaboration partners and their suppliers to manufacture linaclotide API, linaclotide finished drug product, and finished goods.

If any of the Company’s collaboration partners and their suppliers were to limit or terminate production or otherwise fail to meet the quality or delivery requirements needed to satisfy the supply commitments, the process of locating and qualifying alternate sources could require up to several months, during which time production could be

delayed. Such delays could have a material adverse effect on the Company’s business, financial position and results of operations.

Accounts Receivable and Related Valuation Account

Accounts Receivable and Related Valuation Account

The Company makes judgments as to its ability to collect outstanding receivables and provides an allowance for credit losses when collection becomes doubtful. Provisions are made based upon a specific review of all significant outstanding invoices and the overall quality and age of those invoices not specifically reviewed. The Company’s receivables relate primarily to amounts reimbursed under its collaboration, license and co-promotion agreements. The Company believes that credit risks associated with these partners are not significant. The Company reviews the need for an allowance for credit losses for its receivables based on various factors including payment history and historical bad debt experience. The Company had no allowance for credit losses as of December 31, 2020 or 2019.

Concentrations of Credit Risk

Concentrations of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents, restricted cash, and accounts receivable. The Company maintains its cash and cash equivalent balances with high-quality financial institutions and the Company believes that such funds are subject to minimal credit risk. The Company has adopted an investment policy which limits the amounts the Company may invest in certain types of investments, and requires all investments held by the Company to be at least AA- rated, thereby reducing credit risk exposure.

Accounts receivable primarily consist of amounts due under the linaclotide collaboration agreement with AbbVie for North America (Note 6). The Company does not obtain collateral for its accounts receivable. The Company previously reflected amounts due from Allergan, net of amounts payable to Allergan, prior to its acquisition by AbbVie as related party accounts receivable, net. Following the acquisition of Allergan by AbbVie, the Company determined that AbbVie is not a related party to the Company (Note 17).

The percentages of revenue recognized from significant collaborative partners of the Company in the years ended December 31, 2020, 2019 and 2018 as well as the account receivable balances, net of any payables due, at December 31, 2020 and 2019 are included in the following table:

	Accounts Receivable				Revenue
	December 31,				Year Ended December 31,
	2020		2019		2020		2019		2018
Collaborative Partner:
AbbVie (North America and Europe)	76	%	90	%	96	%	78	%	77	%
Astellas (Japan)	1	%	8	%	1	%	13	%	20	%

For the years ended December 31, 2020, 2019 and 2018, no additional customers accounted for more than 10% of the Company’s revenue.

Property and Equipment

Property and Equipment

Property and equipment, including leasehold improvements, are recorded at cost, and are depreciated when placed into service using the straight-line method based on their estimated useful lives as follows:

	Estimated Useful Life
Asset Description	(In Years)
Laboratory equipment	5
Computer and office equipment	3
Furniture and fixtures	7
Software	3

Included in property and equipment are certain costs of software obtained for internal use. Costs incurred during the preliminary project stage are expensed as incurred, while costs incurred during the application development stage are capitalized and amortized over the estimated useful life of the software. The Company also capitalizes costs

related to specific upgrades and enhancements when it is probable the expenditures will result in additional functionality. Maintenance and training costs related to software obtained for internal use are expensed as incurred.

Leasehold improvements are amortized over the shorter of the estimated useful life of the asset or the lease term.

Costs for capital assets not yet placed into service have been capitalized as construction in process, and will be depreciated in accordance with the above guidelines once placed into service. Maintenance and repair costs are expensed as incurred.

Finite Lived Intangible Assets

Finite Lived Intangible Assets

The Company records the fair value of purchased intangible assets with finite useful lives as of the transaction date of a business combination. Purchased intangible assets with finite useful lives are amortized to their estimated residual values over their estimated useful lives. The value of the Company’s finite-lived intangible assets was based on the future expected net cash flows related to ZURAMPIC and DUZALLO (the “Lesinurad Products”), which included significant assumptions around future net sales and the respective investment to support these products. During the year ended December 31, 2018, the Company recorded an impairment charge of approximately $151.8 million to fully write-off its ZURAMPIC and DUZALLO intangible assets.

Impairment of Long-Lived Assets

Impairment of Long-Lived Assets

The Company regularly reviews the carrying amount of its long-lived assets to determine whether indicators of impairment may exist, which warrant adjustments to carrying values or estimated useful lives. If indications of impairment exist, projected future undiscounted cash flows associated with the asset are compared to the carrying amount to determine whether the asset’s value is recoverable. If the carrying value of the asset exceeds such projected undiscounted cash flows, the asset will be written down to its estimated fair value.

Income Taxes

Income Taxes

The Company provides for income taxes under the asset and liability method. Deferred tax assets and liabilities are determined based on differences between financial reporting and tax bases of assets and liabilities and are measured using the enacted tax rates in effect when the differences are expected to reverse. Deferred tax assets are reduced by a valuation allowance to reflect the uncertainty associated with their ultimate realization.

The Company accounts for uncertain tax positions recognized in the consolidated financial statements in accordance with the provisions of ASC Topic 740, Income Taxes, by prescribing a more-likely-than-not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. When uncertain tax positions exist, the Company recognizes the tax benefit of tax positions to the extent that the benefit will more likely than not be realized. The determination as to whether the tax benefit will more likely than not be realized is based upon the technical merits of the tax position as well as consideration of the available facts and circumstances. The Company evaluates uncertain tax positions on a quarterly basis and adjusts the level of the liability to reflect any subsequent changes in the relevant facts surrounding the uncertain positions. Any changes to these estimates, based on the actual results obtained and/or a change in assumptions, could impact the Company’s income tax provision in future periods. Interest and penalty charges, if any, related to unrecognized tax benefits would be classified as a provision for income tax in the Company’s consolidated statement of operations.

Financing Costs

Financing Costs

Financing costs include costs directly attributable to the Company’s offerings of its equity securities and its debt financings. Costs attributable to equity offerings are charged as a reduction to stockholders’ equity against the proceeds of the offering once the offering is completed. Costs attributable to debt financings are deferred and amortized to interest expense over the term of the debt using the effective interest method. Costs incurred in connection with convertible debt securities are allocated between the liability and equity components. In accordance with ASC 835, Interest, the Company presents debt issuance costs on the balance sheet as a direct deduction from the associated debt liability.

Leases

Leases

Effective January 1, 2019, the Company adopted ASC Topic 842, Leases (“ASC 842”), using the optional transition method. The adoption of ASC 842 represented a change in accounting principle that aimed to increase transparency and comparability among organizations by requiring the recognition of right-of-use assets and lease liabilities on the balance sheet for both operating and finance leases. In addition, the standard required enhanced disclosures that meet the objective of enabling financial statement users to assess the amount, timing, and uncertainty of cash flows arising from leases.

As part of the ASC 842 adoption, the Company elected certain practical expedients, which include:

● Accounting policy election to use the short-term lease exception by asset class; and

● Election of the practical expedient package during transition, which includes:

o An entity need not reassess whether any expired or existing contracts are or contain leases.

o An entity need not reassess the classification for any expired or existing leases. As a result, all leases that were classified as operating leases in accordance with ASC 840 are classified as operating leases under ASC 842, and all leases that were classified as capital leases in accordance with ASC 840 are classified as finance leases under ASC 842.

o An entity need not reassess initial direct costs for any existing leases.

Subsequent to the Company’s adoption of ASC 842, the Company elected the post-transition practical expedient, by class of underlying asset, to account for lease components and non-lease components together as a single component for the asset class of operating lease right-of-use real estate assets.

The Company’s lease portfolio for the year ended December 31, 2020 included: a lease for its headquarters location, a data center colocation lease, vehicle leases for its salesforce representatives, and leases for computer and office equipment. The Company determines if an arrangement is a lease at the inception of the contract. The asset component of the Company’s operating leases is recorded as operating lease right-of-use assets, and the liability component is recorded as current portion of operating lease liabilities and operating lease liabilities, net of current portion in the Company’s consolidated balance sheets. As of December 31, 2020, the Company did not record any finance leases.

Right-of-use assets and operating lease liabilities are recognized based on the present value of lease payments over the lease term at the lease inception date. Existing leases in the Company’s lease portfolio as of the adoption date were valued as of January 1, 2019. The Company uses an incremental borrowing rate based on the information available at lease inception in determining the present value of lease payments, if an implicit rate of return is not provided with the lease contract. Operating lease right-of-use assets are adjusted for incentives expected to be received.

Right-of-use assets and operating lease liabilities are remeasured upon certain modifications to leases using the present value of remaining lease payments and estimated incremental borrowing rate upon lease modification.

Lease cost is recognized on a straight-line basis over the lease term, and includes amounts related to short-term leases. The Company recognizes variable lease payments as operating expenses in the period in which the obligation for those payments is incurred. Variable lease payments primarily include common area maintenance, utilities, real estate taxes, insurance, and other operating costs that are passed on from the lessor in proportion to the space leased by the Company.

Derivative Assets and Liabilities

Derivative Assets and Liabilities

In June 2015, the Company issued 2.25% Convertible Senior Notes due June 15, 2022 (the “2022 Convertible Notes”) and in August 2019, the Company issued 0.75% Convertible Senior Notes due 2024 (the “2024 Convertible Notes”) and 1.50% Convertible Senior Notes due 2026 (the “2026 Convertible Notes”) (together with the “2022 Convertible Notes” and the “2024 Convertible Notes”, the “Convertible Senior Notes”). In June 2015, in connection with the issuance of the 2022 Convertible Notes, the Company entered into convertible note hedge transactions (the “Convertible Note Hedges”). Concurrently with entering into the Convertible Note Hedges, the Company also entered into certain warrant transactions in which it sold note hedge warrants (the “Note Hedge Warrants”) to the Convertible

Note Hedge counterparties to acquire shares of the Company’s Class A Common Stock, subject to customary anti-dilution adjustments (Note 11). In connection with the partial repurchase of the 2022 Convertible Notes in August 2019, the Company terminated its Convertible Note Hedges and Note Hedge Warrants proportionately. These instruments are derivative financial instruments under ASC Topic 815, Derivatives and Hedging (“ASC 815”).

These derivatives are recorded as assets or liabilities at fair value each reporting date and the fair value is determined using the Black-Scholes option-pricing model. The changes in fair value are recorded as a component of other (expense) income in the consolidated statements of operations. Significant inputs used to determine the fair value include the price per share of the Company’s Class A Common Stock on the date of valuation, expected term of the derivative instruments, strike prices of the derivative instruments, risk-free interest rate, and expected volatility of the Company’s Class A Common Stock. Changes to these inputs could materially affect the valuation of the Convertible Note Hedges and Note Hedge Warrants in future periods.

In August 2019, in connection with the issuance of the 2024 Convertible Notes and the 2026 Convertible Notes, the Company entered into the Capped Calls. The Capped Calls cover the same number of shares of Class A Common Stock that initially underlie the 2024 Convertible Notes and the 2026 Convertible Notes (subject to anti-dilution and certain other adjustments). These instruments meet the conditions outlined in ASC 815 to be classified in stockholders’ equity (deficit) and are not subsequently remeasured as long as the conditions for equity classification continue to be met.

Revenue Recognition

Revenue Recognition

The Company’s revenues are generated primarily through collaborative arrangements and license agreements related to the research and development and commercialization of linaclotide, as well as co-promotion arrangements in the U.S. The terms of the collaborative research and development, license, co-promotion and other agreements contain multiple performance obligations which may include (i) licenses, (ii) research and development activities, including participation on joint steering committees, (iii) the manufacture of finished drug product, API, or development materials for a partner, which are reimbursed at a contractually determined rate, and (iv) education or co-promotion activities by the Company’s clinical sales specialists. Non-refundable payments to the Company under these agreements may include (i) up-front license fees, (ii) payments for research and development activities, (iii) payments for the manufacture of finished drug product, API, or development materials, (iv) payments based upon the achievement of certain milestones, (v) payments for sales detailing, promotional support services and medical education initiatives, and (vi) royalties on product sales. The Company receives its share of the net profits or bears its share of the net losses from the sale of linaclotide in the U.S. through its collaboration agreement with AbbVie for North America. The Company has adopted a policy to recognize revenue net of tax withholdings, as applicable.

Collaboration, License, Co-Promotion and Other Commercial Agreements

Upon licensing intellectual property to a customer, the Company determines if the license is distinct from the other performance obligations identified in the arrangement. The Company recognizes revenues from the transaction price, including non-refundable, up-front fees allocated to the license when the license is transferred to the customer if the license has distinct benefit to the customer. For licenses that are combined with other promises, the Company assesses the nature of the combined performance obligation to determine whether the combined performance obligation is satisfied over time or at a point in time. For performance obligations that are satisfied over time, the Company evaluates the measure of progress each reporting period and, if necessary, adjusts the measure of performance and related revenue recognition.

The Company’s license and collaboration agreements include milestone payments, such as development and other milestones. The Company evaluates whether the milestones are considered probable of being reached and estimates the amount to be included in the transaction price using the most likely amount method at the inception of the agreement. If it is probable that a significant revenue reversal would not occur, the associated milestone value is included in the transaction price. Milestone payments that are not within the control of the Company, such as regulatory approvals, are not considered probable of being achieved until those approvals are received. The transaction price is then allocated to each performance obligation on a relative standalone selling price basis, for which the Company recognizes revenue as or when the performance obligations under the contract are satisfied. The Company re-evaluates the probability of achievement of such milestones and any related constraint at each reporting period, and any adjustments are recorded on a cumulative catch-up basis.

Agreements that include the supply of API or drug product for either clinical development or commercial supply at the customer’s discretion are generally considered as options. The Company assesses if these options provide a material right to its partner, and if so, they are accounted for as separate performance obligations. If the Company is entitled to additional payments when the customer exercises these options, any additional payments are recorded as revenue when the customer obtains control of the goods, which is typically upon shipment for sales of API and finished drug product.

For agreements that include sales-based royalties, including milestone payments based on the level of sales, and the license is deemed to be the predominant item to which the royalties relate, the Company recognizes revenue when the related sales occur.

Net Profit or Net Loss Sharing

In accordance with ASC 808 Topic, Collaborative Arrangements (“ASC 808”), the Company considers the nature and contractual terms of the arrangement and the nature of the Company’s business operations to determine the classification of payments under the Company’s collaboration agreements. While ASC 808 provides guidance on classification, the standard is silent on matters of separation, initial measurement, and recognition. Therefore, the Company applies the separation, initial measurement, and recognition principles of ASC Topic 606, Revenue from Contracts with Customers (“ASC 606”), as applicable.

The Company’s collaborative arrangements revenues generated from sales of LINZESS in the U.S. are considered akin to sales-based royalties. In accordance with the sales-based royalty exception, the Company recognizes its share of the pre-tax commercial net profit or net loss generated from the sales of LINZESS in the U.S. in the period the product sales are earned, as reported by AbbVie, and related cost of goods sold and selling, general and administrative expenses as incurred by the Company and AbbVie. These amounts are partially determined based on amounts provided by AbbVie and involve the use of estimates and judgments, such as product sales allowances and accruals related to prompt payment discounts, chargebacks, governmental and contractual rebates, wholesaler fees, product returns, and co-payment assistance costs, which could be adjusted based on actual results in the future. The Company is highly dependent on AbbVie for timely and accurate information regarding net revenues from sales of LINZESS in the U.S. in accordance with both ASC 808 and ASC 606, and the related costs, in order to accurately report its results of operations. If the Company does not receive timely and accurate information or incorrectly estimates activity levels associated with the collaboration at a given point in time, the Company could be required to record adjustments in future periods.

In accordance with ASC 606-10-55, Principal Agent Considerations, the Company records revenue transactions as net product revenue in its consolidated statements of operations if it is deemed the principal in the transaction, which includes being the primary obligor, retaining inventory risk, and control over pricing. Given that the Company is not the primary obligor and does not have the inventory risks in the collaboration agreement with AbbVie for North America, it records its share of the net profits or net losses from the sales of LINZESS in the U.S. on a net basis and presents the settlement payments to and from AbbVie as collaboration expense or collaborative arrangements revenue, as applicable. The Company and AbbVie settle the cost sharing quarterly such that the Company’s statements of operations reflect 50% of the pre-tax net profit or loss generated from sales of LINZESS in the U.S.

Product Revenue, Net

Product revenue consisted of sales of the Lesinurad Products, in the U.S. until the termination of the exclusive license to develop, manufacture, and commercialize in the U.S. products containing lesinurad as an active ingredient (the “Lesinurad License”) in January 2019. The Company sold the Lesinurad Products principally to a limited number of national wholesalers and selected regional wholesalers (the “Distributors”). The Distributors resold the Lesinurad Products to retail pharmacies and healthcare providers, who then sold to patients.

Net product revenue was recognized when the Distributor obtained control of the Company’s product, which occurred at a point in time, typically upon shipment of Lesinurad Products to the Distributor. When the Company performed shipping and handling activities after the transfer of control to the Distributor (e.g., when control transfers prior to delivery), they were considered fulfillment activities, and accordingly, the costs were accrued for when the related revenue was recognized. The Company expensed incremental costs of obtaining a contract as and when incurred if the expected amortization period of the asset that the Company would have recognized was one year or less.

The Company evaluated the creditworthiness of each of its Distributors to determine whether it was probable that a significant reversal in the amount of the cumulative revenue recognized would not occur. The Company calculated its net product revenue based on the wholesale acquisition cost that the Company charged its Distributors for the Lesinurad Products less variable consideration. The product revenue variable consideration consisted of estimates relating to (i) trade discounts and allowances, such as invoice discounts for prompt payment and distributor fees, (ii) estimated government and private payor rebates, chargebacks and discounts, such as Medicaid reimbursements, (iii) reserves for expected product returns and (iv) estimated costs of incentives offered to certain indirect customers including patients. These estimates would be adjusted based on actual results in the period such variances became known.

Product revenue was recorded net of the trade discounts, allowances, rebates, chargebacks, discounts, product returns, and other incentives. Certain of these adjustments were recorded as an accounts receivable reserve, while certain of these adjustments were recorded as accrued expenses.

Sale of Active Pharmaceutical Ingredient

During the years ended December 31, 2020, 2019, and 2018, the Company produced linaclotide API, finished drug product, finished goods, and/or development materials for certain of its partners. As of December 31, 2020, the Company is no longer responsible for the supply of linaclotide API, finished drug product, finished goods or development materials to its partners.

As it relates to development materials and API produced for Astellas, the Company was reimbursed at a contracted rate. Such reimbursements were considered as part of revenue generated pursuant to the Astellas license agreement and are presented as collaborative arrangements revenue. Any linaclotide API, finished drug product, finished goods, and development materials AbbVie is responsible for producing for the U.S. are recognized in accordance with the cost-sharing provisions of the collaboration agreement with AbbVie for North America. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, any linaclotide API, finished drug product, and development materials produced for AstraZeneca for China (including Hong Kong and Macau) were recognized in accordance with the cost-sharing provisions of the AstraZeneca collaboration agreement.

The Company recognized revenue on linaclotide API, finished drug product, finished goods, and development materials when control has transferred to the partner, which generally occurs upon shipment after the material passed all quality testing required for acceptance by the partner.

Other

The Company’s deferred revenue balance consists of advance billings and payments received from customers in excess of revenue recognized.

Cost of Revenues

Cost of Revenues

Cost of revenues includes cost related to the sales of linaclotide API and finished drug product, as well as the cost of product revenue related to sales of the Lesinurad Products in the U.S. Cost related to the sales of linaclotide API, finished drug product, and finished goods are generally recognized upon shipment to certain of the Company’s partners outside of the U.S. The Company’s cost of revenues for linaclotide consists of the internal and external costs of producing such API and finished drug product. Cost of product revenue related to the sales of the Lesinurad Products in the U.S. includes the cost of producing finished goods that correspond with product revenue for the reporting period, such as third-party supply and overhead costs, as well as certain period costs related to freight, packaging, stability and quality testing, and customer acquisition.

Research and Development Costs

Research and Development Costs

The Company generally expenses research and development costs to operations as incurred. The Company capitalizes nonrefundable advance payments made by the Company for research and development activities and defers expense recognition until the related goods are received or the related services are performed.

Research and development expenses are comprised of costs incurred in performing research and development activities, including salary, benefits, share-based compensation, and other employee-related expenses; laboratory supplies and other direct expenses; facilities expenses; overhead expenses; third-party contractual costs relating to nonclinical studies and clinical trial activities and related contract manufacturing expenses, development of manufacturing processes and regulatory registration of third-party manufacturing facilities; licensing fees for the Company’s product candidates; and other outside expenses.

The Company has certain collaboration agreements pursuant to which it shares or has shared research and development expenses related to linaclotide. The Company records expenses incurred under such linaclotide collaboration arrangements as research and development expense. Prior to the execution of the Amended AstraZeneca Agreement in September 2019, under the Company’s collaboration agreement with AstraZeneca for China (including Hong Kong and Macau), the Company was reimbursed for certain research and development expenses and it netted these reimbursements against its research and development expenses as incurred. In connection with the execution of the Amended AstraZeneca Agreement, AstraZeneca is fully responsible for all research and development costs incurred related to the development, manufacture, and commercialization of linaclotide in China (including Hong Kong and Macau). Under the Company’s collaboration agreement with AbbVie for North America, the Company is reimbursed for certain research and development expenses and nets these reimbursements against its research and development expenses as incurred. Amounts owed to AbbVie or AstraZeneca under the Company’s respective collaboration agreements were recorded as incremental research and development expense.

Restructuring Expenses

Restructuring Expenses

Restructuring expenses are comprised primarily of costs associated with exit and disposal activities in accordance with ASC 420, Exit or Disposal Cost Obligations, and include one-time termination benefits and contract-related costs. Such costs are based on estimates of fair value in the period liabilities are incurred. The Company evaluates and adjusts these costs for changes in circumstances as additional information becomes available.

Selling, General and Administrative Expenses

Selling, General and Administrative Expenses

The Company expenses selling, general and administrative costs to operations as incurred. Selling, general and administrative expenses consist primarily of compensation, benefits and other employee-related expenses for personnel in the Company’s administrative, finance, legal, information technology, business development, commercial, sales, marketing, communications and human resource functions. Other costs include the legal costs of pursuing patent protection of the Company’s intellectual property, general and administrative related facility costs, insurance costs and professional fees for accounting, tax, consulting, legal and other services.

Prior to the execution of the Amended AstraZeneca Agreement, the Company was reimbursed for certain selling, general and administrative expenses and the Company netted these reimbursements against the Company’s selling, general and administrative expenses as incurred. In connection with the Amended AstraZeneca Agreement, effective in September 2019, AstraZeneca will be fully responsible for all costs related to the development, manufacture, and commercialization of linaclotide in China (including Hong Kong and Macau). The Company includes AbbVie’s selling, general and administrative cost-sharing payments in the calculation of the net profits and net losses from the sale of LINZESS in the U.S. and presents the net payment to or from AbbVie as collaboration expense or collaborative arrangements revenue, respectively.

Share-Based Compensation Expense

Share-Based Compensation Expense

The Company grants awards under its share-based compensation programs, including stock awards, restricted stock awards (“RSAs”), restricted stock units (“RSUs”) (including both time-based and performance-based RSUs), stock options, and shares issued under the Company’s employee stock purchase plan (“ESPP”). Share-based compensation is recognized as expense in the consolidated statements of operations based on the grant date fair value over the requisite service period, net of estimated forfeitures. The Company estimates forfeitures over the requisite service period using historical forfeiture activity and records share-based compensation expense only for those awards that are expected to vest.

The Company estimates the fair value of stock options using the Black-Scholes option-pricing model, which requires the use of subjective assumptions including volatility and expected term, among others. The fair value of stock

awards, RSAs, and RSUs is based on the market value of the Company’s Class A Common Stock on the date of grant, with the exception of performance-based RSUs with market conditions, which are measured using the Monte Carlo simulation method on the date of grant (Note 14). Discounted stock purchases under the Company’s ESPP are valued on the first date of the offering period using the Black-Scholes option-pricing model to compute the fair value of the lookback provision plus the purchase discount.

For awards that vest based on service conditions and market conditions, the Company uses a straight-line method to recognize compensation expense over the respective service period. For awards that contain performance conditions, the Company determines the appropriate amount to expense at each reporting date based on the anticipated achievement of performance targets, which requires judgement, including forecasting the achievement of future specified targets. At the date performance conditions are determined to be probable of achievement, the Company records a cumulative expense catch-up, with remaining expense amortized over the remaining service period. Throughout the performance period, the Company re-assesses the estimated performance and updates the number of performance-based awards that it believes will ultimately vest. Discounted stock purchases under the Company’s ESPP are recognized over the offering period.

Compensation expense related to modified awards is measured based on the fair value for the awards as of the modification date. Any incremental compensation expense arising from the excess of the fair value of the awards on the modification date compared to the fair value of the awards immediately before the modification date is recognized at the modification date or ratably over the requisite remaining service period, as appropriate.

While the assumptions used to calculate and account for share-based compensation awards represent management’s best estimates, these estimates involve inherent uncertainties and the application of management’s judgment. As a result, if revisions are made to the Company’s underlying assumptions and estimates, the Company’s share-based compensation expense could vary significantly from period to period.

Patent Costs

Patent Costs

The Company incurred and recorded as operating expense legal and other fees related to patents of approximately $2.3 million, approximately $7.8 million, and approximately $5.0 million for the years ended December 31, 2020, 2019 and 2018, respectively. These costs were charged to selling, general and administrative expenses as incurred.

Net Income (Loss) Per Share

Net Income (Loss) Per Share

Basic net income (loss) per common share is computed by dividing the net income (loss) by the weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed by dividing net income (loss) by the diluted number of shares outstanding during the period. Except where the result would be antidilutive to net income (loss), diluted net income (loss) per common share is computed assuming the conversion of the 2022 Convertible Notes, the 2024 Convertible Notes and the 2026 Convertible Notes, the exercise of outstanding common stock options and the vesting of RSUs and RSAs (using the treasury stock method), as well as their related income tax effects.

Comprehensive Income (Loss)

Comprehensive Income (Loss)

Comprehensive income (loss) is defined as the change in equity of a business enterprise during a period from transactions, and other events and circumstances from non-owner sources and consists of net income (loss) and changes in unrealized gains and losses on available-for-sale debt securities in the periods presented in the Company’s consolidated statements of comprehensive income (loss).

Subsequent Events

Subsequent Events

The Company considers events or transactions that have occurred after the balance sheet date of December 31, 2020, but prior to the filing of the financial statements with the Securities and Exchange Commission (“SEC”) to provide additional evidence relative to certain estimates or to identify matters that require additional recognition or disclosure. Subsequent events have been evaluated through the filing of the financial statements accompanying this Annual Report on Form 10-K.

New Accounting Pronouncements

New Accounting Pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (the “FASB”) or other standard setting bodies that are adopted by the Company as of the specified effective date. Except as set forth below, the Company did not adopt any new accounting pronouncements during the year ended December 31, 2020 that had a material effect on its consolidated financial statements.

In June 2016, the FASB issued Accounting Standards Update (“ASU”) No. 2016-13, Measurement of Credit Losses on Financial Instruments (“ASU 2016-13”). ASU 2016-13 changed how companies account for credit losses for most financial assets and certain other instruments. For trade receivables, loans and held-to-maturity debt securities, companies are required to recognize an allowance for credit losses rather than reducing the carrying value of the asset. Subsequent to the issuance of ASU 2016-13, the FASB issued ASU No. 2019-04, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, Topic 815, Derivatives and Hedging, and Topic 825, Financial Instruments, ASU No. 2019-05, Financial Instruments—Credit Losses (Topic 326): Targeted Transition Relief (“ASU 2019-05”), ASU No. 2019-10, Financial Instruments—Credit Losses (Topic 326), Derivatives and Hedging (Topic 815), and Leases (Topic 842): Effective Date, ASU No. 2019-11, Codification Improvements to Topic 326, Financial Instruments—Credit Losses, ASU No. 2020-02, Financial Instruments—Credit Losses (Topic 326) and Leases (Topic 842): Amendments to SEC Paragraphs Pursuant to SEC Staff Accounting Bulletin No. 119 and Update to SEC Section on Effective Date Related to Accounting Standards Update No. 2016-02, Leases (Topic 842) to provide additional guidance on the adoption of ASU 2016-13. Early adoption was permitted. The Company adopted these ASUs during the three months ended March 31, 2020. The adoption of these ASUs did not have a material impact on the Company’s financial position and results of operations.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles—Goodwill and Other (Topic 350) (“ASU 2017-04”) to simplify the accounting for goodwill impairment by removing Step 2 of the goodwill impairment test and to eliminate the required quantitative analysis for reporting units with negative carrying value. ASU 2017-04 is effective for fiscal years beginning after December 15, 2019. Early adoption was permitted. The Company adopted ASU 2017-04 during the three months ended March 31, 2020. The adoption of ASU 2017-04 did not have a material impact on the Company’s financial position and results of operations.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework— Changes to the Disclosure Requirement for Fair Value Measurement (“ASU 2018-13”) which amends the disclosure requirements for fair value measurements. The amendments in ASU 2018-13 are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-13 during the three months ended March 31, 2020. The adoption of ASU 2018-13 did not have a material impact on the Company’s financial statement disclosures.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles—Goodwill and Other—Internal Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement that is a Service Contract (a consensus of the FASB Emerging Issues Task Force) (“ASU 2018-15”) which provides guidance on the accounting for costs of implementation activities performed in a cloud computing arrangement that is a service contract. ASU 2015-18 requires a customer in a cloud computing arrangement that is a service contract to follow the internal-use software guidance to determine which implementation costs to capitalize as assets or expense as incurred. The internal-use software guidance requires that certain costs incurred during the application development stage be capitalized and other costs incurred during the preliminary project and post-implementation stages be expensed as they are incurred. A customer’s accounting for the hosting component of the arrangement is not affected by this guidance. The amendments in ASU 2018-15 are effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-15 using the prospective transition method during the three months ended March 31, 2020. The adoption of ASU 2018-15 did not have a material impact on the Company’s financial position and results of operations.

In October 2018, the FASB issued ASU No. 2018-17, Consolidation (Topic 810): Targeted Improvements to Related Party Guidance for Variable Interest Entities (“ASU 2018-17”). The update is intended to improve general purpose financial reporting by considering indirect interests held through related parties in common control arrangements on a proportional basis for determining whether fees paid to decision makers and service providers are variable interests. The amendments in ASU 2018-17 will be effective for fiscal years beginning after December 15, 2019, with early adoption permitted. The Company adopted ASU 2018-17 during the three months ended

March 31, 2020. The adoption of ASU 2018-17 did not have a material impact on the Company’s financial position and results of operations.

In December 2019, the FASB issued ASU No. 2019-12, Income Taxes (Topic 740): Simplifying the Accounting for Income Taxes (“ASU 2019-12”), which is intended to simplify various aspects related to accounting for income taxes. ASU 2019-12 removes certain exceptions to the general principles in Topic 740 and also clarifies and amends existing guidance to improve consistent application. This guidance is effective for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2020, with early adoption permitted. The Company is currently evaluating the potential impact that the adoption of ASU 2019-12 may have on the Company’s financial position and results of operations.

In August 2020, the FASB issued ASU No. 2020-06, Debt—Debt with Conversion and Other Options (Subtopic 470-20) and Derivatives and Hedging— Contracts in Entity’s Own Equity (Subtopic 815-40): Accounting for Convertible Instruments and Contracts in an Entity’s Own Equity (“ASU 2020-06”). The amendments in ASU 2020-06 simplify the accounting for certain financial instruments with characteristics of liabilities and equity, including convertible instruments and contracts on an entity’s own equity. Under ASU 2020-06, a convertible debt instrument will be accounted for as a single liability measured at its amortized cost, as long as no other features require bifurcation and recognition as derivatives. These changes will reduce reported interest expense and increase reported net income for entities that have issued a convertible instrument that was bifurcated under previously existing guidance. The new guidance also requires the if-converted method to be applied for all convertible instruments. The standard is effective for public companies for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2021. Early adoption is permitted. The Company is currently evaluating the impact that the adoption of ASU 2020-06 may have on the Company’s financial position and results of operation.

Other recent accounting pronouncements issued, but not yet effective, are not expected to be applicable to the Company or have a material effect on the consolidated financial statements upon future adoption.

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Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of percentages of revenue and accounts receivable recognized from significant customers

	Accounts Receivable				Revenue
	December 31,				Year Ended December 31,
	2020		2019		2020		2019		2018
Collaborative Partner:
AbbVie (North America and Europe)	76	%	90	%	96	%	78	%	77	%
Astellas (Japan)	1	%	8	%	1	%	13	%	20	%

Schedule of estimated useful life

	Estimated Useful Life
Asset Description	(In Years)
Laboratory equipment	5
Computer and office equipment	3
Furniture and fixtures	7
Software	3

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Cyclerion Separation (Tables)

12 Months Ended

Dec. 31, 2020

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Summary of assets and liabilities transferred in separation

		As of April 1, 2019
Assets:
Prepaid expenses and other current assets	$	1,169
Property and equipment, net		10,241
Other assets		21
	$	11,431
Liabilities:
Accrued research and development costs	$	5,673
Accrued expenses and other current liabilities		3,149
	$	8,822
Net Assets Transferred to Cyclerion	$	2,609

Summary of the discontinued operations

	Year Ended December 31,
	2019		2018
Costs and expenses:
Research and development	$	21,792	$	65,443
Selling, general and administrative		15,646		21,615
Restructuring expenses		—		1,164
Net loss from discontinued operations	$	37,438	$	88,222

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Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of computation of basic and diluted net loss per common share

The following table sets forth the computation of basic and diluted net income (loss) per common share (in thousands, except per share amounts):

	Year Ended December 31,
	2020		2019		2018
Numerator:
Net income (loss)	$	106,176	$	21,505	$	(282,368)
Denominator:
Weighted average number of common shares outstanding used in net income (loss) per share — basic		159,427		156,023		152,634
Effect of dilutive securities:
Stock options		367		—		—
Time-based restricted stock units		766		—		—
Performance-based restricted stock units		1		—		—
Restricted stock		94		—		—
Dilutive potential common shares
Weighted average number of common shares outstanding used in net income (loss) per share — diluted		160,655		156,023		152,634
Net income (loss) per share — basic		0.67		0.14		(1.85)
Net income (loss) per share — diluted	$	0.66	$	0.14	$	(1.85)

Schedule of potentially dilutive securities that have been excluded from computation of diluted weighted average shares outstanding

The outstanding securities have been excluded from the computation of diluted weighted average shares outstanding, as applicable, as their effect would be anti-dilutive (in thousands):

	Year Ended December 31,
	2020	2019	2018
Stock options	11,746	17,194	20,457
Restricted stock awards	2	182	65
Time-based restricted stock units	209	3,207	3,058
Performance-based restricted stock units	93	—	—
Note Hedge Warrants	8,318	8,318	20,250
2022 Convertible Notes	8,318	8,318	20,250
2024 Convertible Notes	14,934	14,934	—
2026 Convertible Notes	14,934	14,934	—
	58,554	67,087	64,080

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Collaboration, License, Promotion and Other Commercial Agreements (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of revenue attributable to transactions from collaboration and license arrangements

	Year Ended December 31,
Collaborative Arrangements Revenue	2020		2019		2018
Linaclotide Collaboration and License Agreements:
AbbVie (North America)	$	370,902	$	327,591	$	266,177
AbbVie (Europe and other)		2,196		1,718		1,146
AstraZeneca (China, including Hong Kong and Macau)		682		32,628		—
Astellas (Japan)		2,128		10,147		—
Co-Promotion and Other Agreements:
AbbVie (VIBERZI)(1)		—		3,723		4,290
Alnylam (GIVLAARI)		4,302		2,000		—
Other		1,335		1,845		1,226
Total collaborative arrangements revenue	$	381,545	$	379,652	$	272,839
Sale of API
Linaclotide Agreements:
Astellas (Japan)	$	2,017	$	45,788	$	69,599
AstraZeneca (China, including Hong Kong and Macau)		5,540		2,973		—
Other		421		—		756
Total sale of API	$	7,978	$	48,761	$	70,355

(1) The Company had an agreement with AbbVie to perform sales detailing activities for VIBERZI® (eluxadoline) which terminated as of December 31, 2019.

AbbVie

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Schedule of revenue attributable to transactions from collaboration and license arrangements

The Company recognized collaborative arrangements revenue from the AbbVie collaboration agreement for North America during the years ended December 31, 2020, 2019, and 2018 as follows (in thousands):

	Year Ended December 31,
	2020		2019		2018
Collaborative arrangements revenue related to sales of LINZESS in the U.S.	$	368,603	$	325,429	$	264,243
Royalty revenue		2,299		2,162		1,934
Total collaborative arrangements revenue	$	370,902	$	327,591	$	266,177

Schedule of amount recorded by the Company for share of net loss related to collaborative arrangement

The following table presents the amounts recorded by the Company for commercial efforts related to LINZESS in the U.S. in the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Ironwood's collaborative arrangement revenue	$	368,603	$	325,429	$	264,243
Selling, general and administrative costs incurred by the Company(1)		(39,312)		(38,123)		(42,435)
Ironwood's share of net profits(2)	$	329,291	$	287,306	$	221,808

(1) Includes Ironwood’s selling, general and administrative expenses attributable to the cost-sharing arrangement with AbbVie. Excludes approximately $0.6 million, approximately $2.4 million, and approximately $2.2 million for the years ended December 31, 2020, 2019, and 2018 respectively, related to patent prosecution and patent litigation costs recognized in connection with the collaboration agreement with AbbVie.

(2) Ironwood has recalculated its share of net profit on sales of LINZESS in the U.S. to conform with AbbVie’s recast of historically reported LINZESS U.S. net sales (previously reported by Allergan).

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Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of assets and liabilities measured at fair value on a recurring basis

The following tables present the assets and liabilities the Company has measured at fair value on a recurring basis (in thousands):

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2020		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents:
Money market funds	$	349,014	$	349,014	$	—	$	—
Restricted cash:
Money market funds		2,221		2,221		—		—
Convertible note hedges		13,065		—		—		13,065
Total assets measured at fair value	$	364,300	$	351,235	$	—	$	13,065
Liabilities:
Note hedge warrants	$	12,088	$	—	$	—	$	12,088
Total liabilities measured at fair value	$	12,088	$	—	$	—	$	12,088

			Fair Value Measurements at Reporting Date Using
			Quoted Prices in		Significant Other		Significant
			Active Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2019		(Level 1)		(Level 2)		(Level 3)
Assets:
Cash and cash equivalents:
Money market funds	$	139,190	$	139,190	$	—	$	—
Repurchase agreements		37,800		37,800		—		—
Restricted cash:
Money market funds		2,221		2,221		—		—
Convertible note hedges		31,366		—		—		31,366
Total assets measured at fair value	$	210,577	$	179,211	$	—	$	31,366
Liabilities:
Note hedge warrants	$	24,260	$	—	$	—	$	24,260
Total liabilities measured at fair value	$	24,260	$	—	$	—	$	24,260

Schedule of assumptions used in fair market valuations

The following inputs were used in the fair market valuation of the Convertible Note Hedges and Note Hedge Warrants as of December 31, 2020 and 2019:

	December 31,						December 31,
	2020						2019
	Convertible			Note Hedge			Convertible			Note Hedge
	Note Hedges			Warrants			Note Hedges			Warrants
Risk-free interest rate (1)		0.1	%		0.1	%		1.6	%		1.6	%
Expected term		1.5			2.0			2.5			3.0
Stock price (2)	$	11.39		$	11.39		$	13.31		$	13.31
Strike price (3)	$	14.51		$	18.82		$	14.51		$	18.82
Common stock volatility (4)		46.7	%		50.3	%		49.1	%		46.5	%
Dividend yield (5)		—	%		—	%		—	%		—	%

(1) Based on U.S. Treasury yield curve, with terms commensurate with the expected terms of the Convertible Note Hedges and the Note Hedge Warrants.

(2) The closing price of the Company’s Class A Common Stock on the last trading days of the years ended December 31, 2020 and 2019, respectively.

(3) As per the respective agreements for the Convertible Note Hedges and Note Hedge Warrants.

(4) Expected volatility based on historical volatility of the Company’s Class A Common Stock.

(5) The Company has not paid and does not anticipate paying cash dividends on its shares of common stock in the foreseeable future; therefore, the expected dividend yield is assumed to be zero.

Schedule of the change in Level 3 convertible note derivatives

The following table reflects the change in the Company's Level 3 Convertible Note Hedges and Note Hedge Warrants from December 31, 2018 through December 31, 2020 (in thousands):

	Convertible		Note Hedge
	Note Hedges		Warrants
Balance at December 31, 2018	$	41,020	$	(33,763)
Cash settlement (received) paid upon early termination of derivatives (Note 11)		(28,909)		25,735
Change in fair value, recorded as a component of gain (loss) on derivatives		19,255		(16,232)
Balance at December 31, 2019	$	31,366	$	(24,260)
Change in fair value, recorded as a component of (loss) gain on derivatives		(18,301)		12,172
Balance at December 31, 2020	$	13,065	$	(12,088)

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Leases (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of components of lease cost and supplemental cash flow information

Lease cost is recognized on a straight-line basis over the lease term. The components of lease cost for the year ended December 31, 2020 and 2019 are as follows (in thousands):

	Year Ended December 31,
	2020		2019
Operating lease cost during period, net(1)	$	2,530	$	16,452
Variable lease payments		—		1,526
Short-term lease cost		1,420		1,512
Total lease cost	$	3,950	$	19,490

(1) Operating lease cost is presented net of approximately $0.3 million of sublease income for the year ended December 31, 2019 related to a sublease agreement between Ironwood and Cyclerion executed upon Separation. The sublease agreement terminated in May 2019.

Supplemental cash flow information related to leases for the periods reported is as follows:

	Year Ended December 31,
	2020			2019
Right-of-use assets obtained in exchange for new operating lease upon adoption of ASC 842 (in thousands)	$	—		$	88,299
Adjustment to right-of-use assets as a result of the lease modification upon Separation (in thousands)		—			(40,427)
Adjustment to right-of-use assets as a result of the termination of the Binney Street Lease (in thousands)		—			(34,440)
Right-of-use assets obtained in exchange for new operating lease liabilities upon execution of Summer Street Lease (in thousands)		—			18,452
Cash paid for amounts included in the measurement of lease liabilities (in thousands)		1,146			18,598
Weighted-average remaining lease term of operating leases (in years)		9.3			10.2
Weighted-average discount rate of operating leases		5.8	%		5.8	%

Schedule of future minimum lease payments under non-cancelable operating leases

Future minimum lease payments under non-cancelable operating leases as of December 31, 2020 are as follows (in thousands):

	Operating
	Lease
	Payments
2021	$	3,128
2022		3,129
2023		3,065
2024		3,126
2025		3,189
2026 and thereafter		14,856
Total future minimum lease payments		30,493
Less: present value adjustment		(7,047)
Operating lease liabilities at December 31, 2020		23,446
Less: current portion of operating lease liabilities		(3,128)
Operating lease liabilities, net of current portion	$	20,318

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of property and equipment

Property and equipment, net consisted of the following (in thousands):

	December 31,
	2020		2019
Software	$	8,615	$	9,568
Leasehold improvements		7,407		7,318
Laboratory equipment		1,898		2,193
Furniture and fixtures		1,517		1,508
Computer and office equipment		1,297		1,293
Construction in process		—		631
		20,734		22,511
Less accumulated depreciation and amortization		(11,805)		(10,082)
	$	8,929	$	12,429

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Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of accrued expenses and other current liabilities

Accrued expenses and other current liabilities consisted of the following (in thousands):

	December 31,
	2020		2019
Accrued incentive compensation	$	8,719	$	11,760
Accrued vacation		2,625		2,540
Professional fees		530		1,421
Salaries		627		2,973
Other employee benefits		1,442		1,260
Restructuring liabilities		10,510		179
Other		2,033		10,332
	$	26,486	$	30,465

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Notes Payable (Tables)

12 Months Ended

Dec. 31, 2020

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Schedule of outstanding Convertible Note

The Company’s outstanding balances for the convertible senior notes as of December 31, 2020 and 2019 consisted of the following (in thousands):

	December 31,
	2020		2019
Liability component:
Principal:
2022 Convertible Notes	$	120,699	$	120,699
2024 Convertible Notes		200,000		200,000
2026 Convertible Notes		200,000		200,000
Less: unamortized debt discount		(83,900)		(104,700)
Less: unamortized debt issuance costs		(6,543)		(8,005)
Net carrying amount	$	430,256	$	407,994
Equity component:
2022 Convertible Notes		19,807		19,807
2024 Convertible Notes		41,152		41,152
2026 Convertible Notes		51,350		51,350
Total equity component	$	112,309	$	112,309

Schedule of interest expense related to Convertible Notes

	Year Ended December 31,
	2020		2019		2018
Contractual interest expense	$	7,216	$	7,361	$	7,553
Amortization of debt issuance costs		1,462		1,190		971
Amortization of debt discount		20,800		17,683		15,437
Total interest expense	$	29,478	$	26,234	$	23,961

Schedule of future minimum payments details of debt

2021	$	7,216
2022		126,557
2023		4,500
2024		203,750
2025		3,000
2026		201,500
Total future minimum payments under the convertible senior notes		546,523
Less: amounts representing interest		(25,824)
Less: unamortized debt discount		(83,900)
Less: unamortized debt issuance costs		(6,543)
Convertible senior notes balance	$	430,256

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Employee Stock Benefit Plans (Tables)

12 Months Ended

Dec. 31, 2020

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Summary of expense recognized for share-based compensation arrangements

The following table summarizes share-based compensation expense by award type (in thousands):

	Year Ended December 31,
	2020		2019		2018
Stock options	$	7,680	$	12,526	$	20,478
Time-based restricted stock units		18,624		15,488		17,160
Performance-based restricted stock units		2,190		—		—
Restricted stock awards		1,886		2,095		2,330
Employee stock purchase plan		722		1,115		1,097
Stock awards		73		54		17
	$	31,175	$	31,278	$	41,082

Share-based compensation expense reflected in the condensed consolidated statements of operations

The following table summarizes the share-based compensation expense reflected in the consolidated statements of operations (in thousands):

	Years Ended December 31,
	2020		2019		2018
Research and development	$	5,569	$	6,343	$	11,500
Selling, general and administrative		23,825		24,281		27,440
Restructuring expenses		1,781		654		2,142
	$	31,175	$	31,278	$	41,082

Schedule of weighted-average assumptions used to estimate the fair value of Relative TSR PSUs

	Year Ended December 31,
	2020
Fair value of common stock	$ 11.78
Expected volatility	53.3	%
Expected term (in years)	2.8
Risk-free interest rate	1.0	%
Expected dividend yield	—	%

Summary of restricted stock activity

		Weighted-
		Average
	Number of	Grant Date
	Shares	Fair Value
Unvested as of December 31, 2019	181,648	$	10.76
Granted	246,500		10.16
Vested	(181,648)		10.46
Forfeited	—		—
Unvested as of December 31, 2020	246,500	$	10.38

Schedule of weighted-average assumptions used to estimate the fair value of the stock options using the Black-Scholes option-pricing model

	Years Ended December 31,
	2020		2019		2018
Expected volatility	46.6	%	46.3	%	43.7	%
Expected term (in years)	6.1		6.1		6.0
Risk-free interest rate	1.5	%	2.5	%	2.7	%
Expected dividend yield	—	%	—	%	—	%

Summary of stock option activity

		Weighted-		Weighted-
	Number of	Average		Average	Aggregate
	Stock	Exercise		Contractual	Intrinsic
	Options	Price(1)		Life	Value
				(in years)	(in thousands)
Outstanding at December 31, 2019	17,194,239	$	12.13	5.11	$	25,226
Granted	55,000		12.84	—		—
Exercised	(1,735,081)		10.21	—		—
Cancelled	(2,054,487)		13.00	—		—
Outstanding at December 31, 2020	13,459,671		12.25	4.27		5,613
Vested or expected to vest at December 31, 2020	13,280,456		12.26	4.23		5,575
Exercisable at December 31, 2020	11,963,812		12.26	3.90		5,371

(1) Exercise prices relating to stock options granted prior to the Separation have not been adjusted to reflect the effect of the Separation on the stock options.

Schedule of unrecognized share-based compensation expense, net of estimated forfeitures by type of awards and weighted-average period

	Unrecognized		Weighted-Average
	Expense, Net		Remaining
	of Estimated		Recognition
	Forfeitures		Period
	(in thousands)		(in years)
Type of award:
Stock options with time-based vesting	$	6,557	1.84
Restricted stock awards		1,473	0.92
Time-based restricted stock units		26,934	2.22
Performance-based restricted stock units		3,291	1.70
Stock options with time-based and performance-based vesting (1)		88	—

(1) The weighted-average remaining recognition period cannot be determined for performance-based or time-accelerated options due to the nature of such awards, as detailed above.

Time-based Restricted Stock Units

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Summary of RSU activity

		Weighted-
		Average
	Number	Grant Date
	of RSUs	Fair Value
Outstanding as of December 31, 2019	3,207,089	$	12.33
Granted	2,708,200		11.59
Vested and released	(965,625)		12.37
Forfeited	(779,038)		11.96
Outstanding as of December 31, 2020	4,170,626	$	11.90

Performance-based Restricted Stock Units

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Summary of RSU activity

		Weighted-
		Average
	Number	Grant Date
	of RSUs	Fair Value(1)
Outstanding as of December 31, 2019	—	$	—
Granted	586,157		12.48
Vested and released	—		—
Forfeited	—		—
Outstanding as of December 31, 2020	586,157	$	12.48

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2020

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Reconciliation of income taxes from continuing operations computed using U.S. federal statutory rate to that reflected in operations

A reconciliation of income taxes computed using the U.S. federal statutory rate of 21% to that reflected in the consolidated statements of operations are as follows (in thousands):

	Year Ended December 31,
	2020		2019		2018
Income tax benefit using U.S. federal statutory rate	$	22,861	$	4,517	$	(59,297)
Permanent differences		74		65		218
State income taxes, net of federal benefit		7,565		(1,902)		(17,121)
Disallowed Separation related costs		—		4,658		—
Executive compensation - Section 162(m)		1,718		662		8
Meals and entertainment		395		495		995
Non-deductible share-based compensation		(144)		(1,202)		(494)
Excess tax benefits		5,132		3,324		(1,223)
Fair market valuation of Note Hedge Warrants and Convertible Note Hedges		1,680		(290)		2,367
Tax credits		(3,149)		(4,374)		(7,863)
Expiring net operating losses and tax credits		1,991		3,764		250
Effect of change in state tax rate on deferred tax assets and deferred tax liabilities		(208)		(2,563)		1,476
Change in the valuation allowance		(35,230)		(7,154)		80,684
Income tax expense	$	2,685	$	—	$	—

Schedule of components of deferred tax assets and liabilities

Deferred tax assets and liabilities were determined based on the difference between financial statement and tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The components of the Company’s deferred tax assets and liabilities are as follows (in thousands):

	December 31,
	2020		2019
Deferred tax assets:
Net operating loss carryforwards	$	234,772	$	265,494
Tax credit carryforwards		60,607		59,892
Capitalized research and development		7,498		9,952
Share-based compensation		21,848		24,401
Basis difference on collaboration agreement for North America with AbbVie		62,629		48,594
Accruals and reserves		6,114		6,415
Basis difference on 2022 Convertible Notes		6,183		4,322
Interest expense		3,386		22,020
Operating lease liability		6,504		6,421
Other		5,049		5,295
Total deferred tax assets		414,590		452,806
Deferred tax liabilities:
Basis difference on 2024 Convertible Notes		(5,951)		(7,381)
Basis difference on 2026 Convertible Notes		(9,022)		(10,276)
Operating lease right-of-use assets		(4,603)		(4,905)
Total deferred tax liabilities		(19,576)		(22,562)
Net deferred tax asset		395,014		430,244
Valuation allowance		(395,014)		(430,244)
Net deferred tax asset	$	—	$	—

Summary of changes in the unrecognized tax benefits

The following table summarizes the changes in the Company’s unrecognized income tax benefits for the years ended December 31, 2020, 2019, and 2018 (in thousands):

	Year Ended December 31,
	2020		2019		2018
Balance at the beginning of the period	$	53,099	$	38,551	$	24,078
Increases based on tax positions related to the current period		66,687		51,699		38,551
Increases for tax positions related to prior periods		—		1,400		—
Decreases for tax positions in prior periods		(51,699)		(38,551)		(24,078)
Balance at the end of the period	$	68,087	$	53,099	$	38,551

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Selected Quarterly Financial Data (Unaudited) (Tables)

12 Months Ended

Dec. 31, 2020

Table Text Blocks

Selected Quarterly Financial Data (Unaudited)

	First		Second		Third		Fourth		Total
	Quarter		Quarter		Quarter		Quarter		Year
	(in thousands, except per share data)
2020
Total revenues (1)	$	79,943	$	89,432	$	103,468	$	116,680	$	389,523
Total cost and expenses (2)		66,716		56,719		57,852		65,296		246,583
Other expense, net (3)		(9,882)		(7,509)		(9,804)		(6,884)		(34,079)
Net income and comprehensive income		3,345		25,204		34,423		43,204		106,176
Net income per share—basic		0.02		0.16		0.22		0.27		0.67
Net income per share—diluted		0.02		0.16		0.21		0.27		0.66

	First		Second		Third		Fourth		Total
	Quarter		Quarter		Quarter		Quarter		Year
	(in thousands, except per share data)
2019
Total revenues (4)	$	68,730	$	102,215	$	131,167	$	126,301	$	428,413
Total cost and expenses (5)		85,663		80,638		65,280		76,709		308,290
Other expense, net (6)		(4,912)		(9,294)		(45,239)		(1,735)		(61,180)
Net (loss) income from continuing operations		(21,846)		12,283		20,648		47,858		58,943
Net loss from discontinued operations(7)		(37,438)		—		—		—		(37,438)
Net income (loss) and comprehensive income (loss)		(59,284)		12,283		20,648		47,858		21,505
Income per share from continuing operations, net of income taxes—basic	$	(0.14)	$	0.08	$	0.13	$	0.31	$	0.38
Income per share from continuing operations, net of income taxes—diluted		(0.14)		0.08		0.13		0.30		0.38
Net loss per share from discontinued operations—basic and diluted		(0.24)		—		—		—		(0.24)
Net income (loss) per share—basic		(0.38)		0.08		0.13		0.31		0.14
Net income (loss) per share—diluted		(0.38)		0.08		0.13		0.30		0.14

(1) Total revenues includes approximately $8.0 million of revenue from sales of linaclotide API to the Company’s linaclotide partners for the year ended December 31, 2020.

(2) Total costs and expenses includes approximately $15.4 million in restructuring expenses for the year ended December 31, 2020.

(3) Other expense, net includes approximately $6.1 million loss on fair value remeasurement of derivatives for the year ended December 31, 2020.

(4) Total revenues includes approximately $48.8 million of revenue from sales of linaclotide API to the Company’s linaclotide partners, primarily driven by the commercialization of linaclotide in Japan for the year ended December 31, 2019, as well as approximately $32.4 million related to the non-contingent payments from the Amended AstraZeneca Agreement and a $10.0 million upfront fee from the Amended Astellas License Agreement, both executed during the third quarter of 2019.

(5) Total costs and expenses includes approximately $3.6 million in restructuring expenses for the year ended December 31, 2019, as well as approximately $3.2 million related to the gain on lease modification in April 2019.

(6) Other expense, net includes approximately $31.0 million in loss on extinguishment of debt related to the partial repurchase of the 2022 Convertible Notes and the redemption of the 2026 Notes, and approximately $3.0 million gain on fair value remeasurement of derivatives for the year ended December 31, 2019.

(7) During the year ended December 31, 2019, the Company completed the Separation. Certain amounts related to Cyclerion have been reclassified as discontinued operations for the year ended December 31, 2019.

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Nature of Business - Workforce Reduction and Restructuring (Details)	1 Months Ended
	Sep. 30, 2020 employee
Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020
Workforce Reduction
Number of employees expected to be eliminated	100

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Nature of Business - Accumulated Deficit (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated deficit
Net income	$ 43,204	$ 34,423	$ 25,204	$ 3,345	$ 47,858	$ 20,648	$ 12,283	$ (59,284)	$ 106,176	$ 21,505	$ (282,368)
Accumulated deficit since inception	$ 1,466,056				$ 1,572,232				$ 1,466,056	$ 1,572,232

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Summary of Significant Accounting Policies - Segment Information (Details) - segment	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Segment information
Number of reportable segments	1	1	1

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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents
Cash Equivalent included in cash and cash equivalent	$ 349.0	$ 177.0

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Summary of Significant Accounting Policies - Restricted Cash (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Cash [Abstract]
Restricted cash	$ 2,220	$ 2,221	$ 7,676
Restricted cash, current	1,735	1,250
Restricted cash, noncurrent	$ 485	$ 971

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Summary of Significant Accounting Policies - Concentrations of Credit Risk (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accounts Receivable | Credit Concentration Risk | AbbVie
Concentrations
Concentration risk percentage (as a percent)	76.00%	90.00%
Accounts Receivable | Credit Concentration Risk | Astellas Pharma Inc.
Concentrations
Concentration risk percentage (as a percent)	1.00%	8.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | AbbVie
Concentrations
Concentration risk percentage (as a percent)	96.00%	78.00%	77.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Astellas Pharma Inc.
Concentrations
Concentration risk percentage (as a percent)	1.00%	13.00%	20.00%

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Summary of Significant Accounting Policies - Property and Equipment (Details)	12 Months Ended
	Dec. 31, 2020
Laboratory equipment
Property and Equipment
Estimated useful life	5 years
Computer and office equipment
Property and Equipment
Estimated useful life	3 years
Furniture and fixtures
Property and Equipment
Estimated useful life	7 years
Software
Property and Equipment
Estimated useful life	3 years

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Summary of Significant Accounting Policies - Finite Lived Intangible Assets (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Finite Lived Intangible Assets
Impairment of intangible assets	$ 151,794

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Summary of Significant Accounting Policies - Leases (Details)	12 Months Ended
	Dec. 31, 2020
Leases
Lease, Practical Expedients, Package	true
Lease, Practical Expedient, Lessor Single Lease Component	true

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Summary of Significant Accounting Policies - Derivative Assets and Liabilities (Details) - Convertible Senior Notes	Sep. 16, 2019	Aug. 12, 2019	Jun. 30, 2015
2.25% Convertible Senior Notes due 2022
Notes Payable
Stated interest rate (as a percent)	2.25%		2.25%
0.75% Convertible Senior Notes due 2024
Notes Payable
Stated interest rate (as a percent)		0.75%
1.50% Convertible Senior Notes due 2026
Notes Payable
Stated interest rate (as a percent)		1.50%

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Summary of Significant Accounting Policies - Revenue Recognition - General Information (Details)	12 Months Ended
	Dec. 31, 2020
U.S. | AbbVie
Collaboration agreements
Percentage of the pre-tax net profit or loss (as a percent)	50.00%

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Summary of Significant Accounting Policies - Revenue Recognition - Practical Expedients (Details)	12 Months Ended
	Dec. 31, 2020
Practical expedients
Practical Expedient, Incremental Cost	true

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Summary of Significant Accounting Policies - Patent Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Patent Costs
Selling, general and administrative	$ 140,003	$ 172,450	$ 219,676
Patents
Patent Costs
Selling, general and administrative	$ 2,300	$ 7,800	$ 5,000

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Summary of Significant Accounting Policies - New Accounting Pronouncements (Details)	12 Months Ended
	Dec. 31, 2020
Accounting Standards Update 2016-02
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2019
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected	us-gaap:AccountingStandardsUpdate201602CumulativeEffectPeriodOfAdoptionMember
Accounting Standards Update 2016-13
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Accounting Standards Update 2017-04
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Accounting Standards Update 2018-13
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Accounting Standards Update 2018-15
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected	us-gaap:AccountingStandardsUpdate201815ProspectiveMember
Accounting Standards Update 2018-17
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2020
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Accounting Standards Update 2019-12
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	false
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false
Accounting Standards Update 2020-06
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	false
Change in Accounting Principle, Accounting Standards Update, Early Adoption	false

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Cyclerion Separation - Separation Agreement (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Apr. 01, 2019
Assets:
Prepaid expenses and other current assets	$ 9,189	$ 10,685
Property and equipment, net	8,929	12,429
Other assets	943	790
Total assets	559,238	402,748
Liabilities:
Accrued research and development costs	1,898	2,956
Accrued expenses and other current liabilities	$ 26,486	$ 30,465
Cyclerion Therapeutics, Inc.
Assets:
Prepaid expenses and other current assets			$ 1,169
Property and equipment, net			10,241
Other assets			21
Total assets			11,431
Liabilities:
Accrued research and development costs			5,673
Accrued expenses and other current liabilities			3,149
Total liabilities			8,822
Net Assets Transferred to Cyclerion			$ 2,609

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Cyclerion Separation - Related Party Information (Details) - Affiliated Entity - Cyclerion Therapeutics, Inc. $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($) agreement	Dec. 31, 2019 USD ($)
Cyclerion Separation
Tenant improvement reimbursement provisions received		$ 1.3
Incremental stock-based compensation expense		0.0
Transition services agreements | agreement	2
Other income for services provided to related party		0.3
Accounts payable due related party		1.5
Research and development
Cyclerion Separation
Expense for service provided by related party	$ 2.3	$ 4.5

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Cyclerion Separation - Summary of Expenses (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Net Loss from Discontinued Operations
Net loss from discontinued operations	$ 37,438	$ 37,438	$ 88,222
sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Net Loss from Discontinued Operations
Net loss from discontinued operations		37,438	88,222
Research and development | sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Net Loss from Discontinued Operations
Net loss from discontinued operations		21,792	65,443
Selling, general and administrative | sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Net Loss from Discontinued Operations
Net loss from discontinued operations		$ 15,646	21,615
Restructuring expenses | sGC Business | Discontinued Operations, Disposed of by Means Other than Sale, Spinoff
Net Loss from Discontinued Operations
Net loss from discontinued operations			$ 1,164

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Cyclerion Separation - Summary of Assets and Liabilities Held for Disposition (Details) - Discontinued Operations, Disposed of by Means Other than Sale, Spinoff - sGC Business - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Assets	$ 0	$ 0
Liabilities:
Liabilities	$ 0	$ 0

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Net Income (Loss) Per Share - Computation (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator:
Net income (loss)	$ 43,204	$ 34,423	$ 25,204	$ 3,345	$ 47,858	$ 20,648	$ 12,283	$ (59,284)	$ 106,176	$ 21,505	$ (282,368)
Net income (loss) available to common stockholders, basic									106,176	21,505	(282,368)
Net income (loss) available to common stockholders, diluted									$ 106,176	$ 21,505	$ (282,368)
Denominator:
Weighted average number of common shares outstanding used in net income (loss) per share - basic (in shares)									159,427	156,023	152,634
Effect of dilutive securities:
Weighted average number of common shares outstanding used in net income (loss) per share - diluted (in shares)									160,655	156,023	152,634
Net income (loss) per share - basic (in dollars per share)	$ 0.27	$ 0.22	$ 0.16	$ 0.02	$ 0.31	$ 0.13	$ 0.08	$ (0.38)	$ 0.67	$ 0.14	$ (1.85)
Net income (loss) per share - diluted (in dollars per share)	$ 0.27	$ 0.21	$ 0.16	$ 0.02	$ 0.30	$ 0.13	$ 0.08	$ (0.38)	$ 0.66	$ 0.14	$ (1.85)
Stock options
Effect of dilutive securities:
Effect of dilutive securities									367
Time-based Restricted Stock Units
Effect of dilutive securities:
Effect of dilutive securities									766
Performance-based Restricted Stock Units
Effect of dilutive securities:
Effect of dilutive securities									1
Restricted Stock
Effect of dilutive securities:
Effect of dilutive securities									94

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Net Income (Loss) Per Share - Potentially Dilutive Securities (Details) - shares shares in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	58,554	67,087	64,080
Stock options
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	11,746	17,194	20,457
Restricted Stock
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	2	182	65
Time-based Restricted Stock Units
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	209	3,207	3,058
Performance-based Restricted Stock Units
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	93
Note Hedge Warrants
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	8,318	8,318	20,250
2.25% Convertible Senior Notes due 2022
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	8,318	8,318	20,250
0.75% Convertible Senior Notes due 2024
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	14,934	14,934
1.50% Convertible Senior Notes due 2026
Potentially dilutive securities
Total potentially dilutive securities excluded from the computation of diluted weighted average shares outstanding (in shares)	14,934	14,934

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Goodwill and Intangible Assets - Intangible Assets - General Information (Details) - Developed Technology - USD ($) $ in Millions	Jul. 31, 2018	Jun. 02, 2016
DUZALLO
Goodwill and Intangible Assets
Intangible assets, net		$ 145.1
Accumulated amortization	$ 11.7
ZURAMPIC
Goodwill and Intangible Assets
Intangible assets, net		$ 22.0
Accumulated amortization	$ 3.6

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Goodwill and Intangible Assets - Intangible Assets - Impairment (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($)
Goodwill and Intangible Assets
Impairment of intangible assets	$ 151,794
Developed Technology
Goodwill and Intangible Assets
Impairment of intangible assets	$ 151,800

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Goodwill and Intangible Assets - Goodwill Impairment (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Goodwill
Impairment of goodwill	$ 0.0	$ 0.0	$ 0.0

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Collaboration, License, Promotion and Other Commercial Agreements - Summary (Details) - USD ($) $ in Thousands		3 Months Ended								12 Months Ended
	Aug. 01, 2019	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Revenue		$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Collaborative arrangements revenue
Revenues:
Revenue										381,545	379,652	272,839
Collaborative arrangement, other agreements
Revenues:
Revenue										1,335	1,845	1,226
Sale of active pharmaceutical ingredient
Revenues:
Revenue										7,978	48,761	70,355
AbbVie | Collaborative arrangement, promotion agreements
Revenues:
Revenue											3,723	4,290
AbbVie | Sale of active pharmaceutical ingredient
Revenues:
Revenue										421		756
AbbVie | North America | Collaborative arrangements revenue
Revenues:
Revenue										370,902	327,591	266,177
AbbVie | North America | Collaborative arrangement, collaboration and license agreements
Revenues:
Revenue										370,902	327,591	266,177
AbbVie | Europe and Other | Collaborative arrangement, collaboration and license agreements
Revenues:
Revenue										2,196	1,718	1,146
AstraZeneca | Collaborative arrangement, collaboration and license agreements
Revenues:
Revenue										682	32,628
AstraZeneca | Sale of active pharmaceutical ingredient
Revenues:
Revenue										5,540	2,973
Astellas Pharma Inc. | Collaborative arrangement, collaboration and license agreements
Revenues:
Revenue	$ 20,400									2,128	10,147
Astellas Pharma Inc. | Sale of active pharmaceutical ingredient
Revenues:
Revenue										2,017	45,788	$ 69,599
Alnylam | Collaborative arrangement, promotion agreements
Revenues:
Revenue										$ 4,302	$ 2,000

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Collaboration, License, Promotion and Other Commercial Agreements - Accounts Receivable (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Accounts receivable, net
Accounts receivable, net	$ 145.8	$ 43.9
Accounts receivable, net of accounts payable	110.9
AbbVie
Accounts receivable, net
Accounts payable	$ 4.3

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Collaboration, License, Promotion and Other Commercial Agreements - Related Party Transactions (Details) $ in Thousands	Dec. 31, 2019 USD ($)
Related party transactions
Related party accounts receivable, net of related party accounts payable	$ 105,967
Related party accounts payable, net	1,509
Investor | Allergan
Related party transactions
Related party accounts receivable, net	110,100
Related party accounts payable, net	$ 4,100

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Collaboration, License, Promotion and Other Commercial Agreements - Deferred Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred revenue
Deferred revenue	$ 0	$ 900

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Collaboration, License, Promotion and Other Commercial Agreements - North America - General Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($) item payment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Collaboration, License, Promotion and Other Commercial Agreements
Research and development expense	$ 88,062	$ 115,044	$ 101,060
Sales milestones
Collaboration, License, Promotion and Other Commercial Agreements
Sales-related milestone if certain conditions are met	80,000
AbbVie
Collaboration, License, Promotion and Other Commercial Agreements
Equity investment in the entity's capital stock	$ 25,000
Remaining commercial-period performance obligations | item	3
Cost sharing amount, reduction to research and development	$ 5,600	7,200	9,000
Collaborative arrangement, percentage of obligation of development costs incurred	50.00%
Percentage of net profit from commercialization (as a percent)	50.00%
Percentage of net loss from commercialization (as a percent)	50.00%
AbbVie | Development and sales milestones
Collaboration, License, Promotion and Other Commercial Agreements
Cumulative license fees and development milestone payments received	$ 205,000
AbbVie | Development milestones
Collaboration, License, Promotion and Other Commercial Agreements
Number of milestone payments received | payment	6
North America
Collaboration, License, Promotion and Other Commercial Agreements
Research and development expense	$ 20,100	$ 37,600	$ 39,200

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Collaboration, License, Promotion and Other Commercial Agreements - North America - Change in Accounting Estimate (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Change in accounting estimate
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730			$ 389,523	$ 428,413	$ 346,639
Collaborative arrangements revenue
Change in accounting estimate
Revenue											381,545	379,652	272,839
Collaborative arrangements revenue | AbbVie | North America
Change in accounting estimate
Revenue											370,902	327,591	266,177
Collaborative arrangements, LINZESS | AbbVie | North America
Change in accounting estimate
Revenue											$ 368,603	$ 325,429	$ 264,243
Sales Returns and Allowances | Collaborative arrangements, LINZESS | AbbVie | North America | Collaborative arrangement, collaboration and license agreements
Change in accounting estimate
Revenue										$ (29,700)
Sales Returns and Allowances | AbbVie
Change in accounting estimate
Revenue									$ 200	$ 59,300

XML

Collaboration, License, Promotion and Other Commercial Agreements - North America - Collaborative Arrangements Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Collaborative arrangements revenue
Revenues:
Revenue									381,545	379,652	272,839
AbbVie | North America | Collaborative arrangements revenue
Revenues:
Revenue									370,902	327,591	266,177
AbbVie | North America | Collaborative arrangements, LINZESS
Revenues:
Revenue									368,603	325,429	264,243
AbbVie | North America | Royalty
Revenues:
Revenue									$ 2,299	$ 2,162	$ 1,934

XML

Collaboration, License, Promotion and Other Commercial Agreements - North America - Commercial Efforts (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Collaboration, License, Promotion and Other Commercial Agreements
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Selling, general and administrative costs incurred by the Company									(140,003)	(172,450)	(219,676)
AbbVie | U.S.
Collaboration, License, Promotion and Other Commercial Agreements
Patent prosecution costs										2,400
Patent litigation costs									600	2,200
Collaborative arrangements revenue
Collaboration, License, Promotion and Other Commercial Agreements
Revenue									381,545	379,652	272,839
Collaborative arrangements, LINZESS | AbbVie | U.S.
Collaboration, License, Promotion and Other Commercial Agreements
Revenue									368,603	325,429	264,243
Selling, general and administrative costs incurred by the Company									(39,312)	(38,123)	(42,435)
The Company's share of net profit									$ 329,291	$ 287,306	$ 221,808

XML

Collaboration, License, Promotion and Other Commercial Agreements - North America - Royalty Revenue (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues:
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Collaborative arrangements revenue
Revenues:
Revenue									381,545	379,652	272,839
Collaborative arrangements revenue | North America | AbbVie
Revenues:
Revenue									370,902	327,591	266,177
Royalty | North America | AbbVie
Revenues:
Revenue									2,299	2,162	1,934
Royalty | Canada and Mexico | AbbVie
Revenues:
Revenue									$ 2,300	$ 2,200	$ 1,900

XML

Collaboration, License, Promotion and Other Commercial Agreements - European and Other Territories (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Oct. 31, 2015	Sep. 30, 2012
Collaboration, License, Promotion and Other Commercial Agreements
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Collaborative arrangements revenue
Collaboration, License, Promotion and Other Commercial Agreements
Revenue									$ 381,545	379,652	272,839
License | AbbVie
Collaboration, License, Promotion and Other Commercial Agreements
Royalty percentage, five years following the first commercial sale									upper-single digits
Annual royalty									5 years
Royalty percentage, thereafter									low-double digits
Royalty percentage, expanded territory									lower-single digits
License | AbbVie | Europe
Collaboration, License, Promotion and Other Commercial Agreements
Remaining milestone payment due upon the amendment to the license agreement												$ 42,500
Revenue remaining performance obligation													$ 0
Royalty | AbbVie | Europe
Collaboration, License, Promotion and Other Commercial Agreements
Revenue									$ 2,200	$ 1,700	$ 1,100

XML

Collaboration, License, Promotion and Other Commercial Agreements - Japan (Details) $ in Thousands		1 Months Ended	3 Months Ended								12 Months Ended
	Aug. 01, 2019 USD ($)	Nov. 30, 2009 USD ($) payment	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)
Collaboration, License, Promotion and Other Commercial Agreements
Revenue			$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Astellas Pharma Inc., 2009 License Agreement | Japan
Collaboration, License, Promotion and Other Commercial Agreements
Up-front fee received		$ 30,000
Number of milestone payments | payment		3
Milestone payments received		$ 45,000
Collaborative arrangements revenue
Collaboration, License, Promotion and Other Commercial Agreements
Revenue											381,545	379,652	272,839
Collaborative arrangement, collaboration and license agreements | Astellas Pharma Inc.
Collaboration, License, Promotion and Other Commercial Agreements
Revenue	$ 20,400										2,128	10,147
Collaborative arrangement, collaboration and license agreements | Astellas Pharma Inc. | Japan
Collaboration, License, Promotion and Other Commercial Agreements
Non-refundable upfront payment	$ 10,000
Collaborative arrangement, collaboration and license agreements, upfront fee | Astellas Pharma Inc.
Collaboration, License, Promotion and Other Commercial Agreements
Revenue											10,000
Sale of active pharmaceutical ingredient
Collaboration, License, Promotion and Other Commercial Agreements
Revenue											7,978	48,761	70,355
Sale of active pharmaceutical ingredient | Astellas Pharma Inc.
Collaboration, License, Promotion and Other Commercial Agreements
Revenue											2,017	45,788	$ 69,599
Sale of active pharmaceutical ingredient | Astellas Pharma Inc. | Japan
Collaboration, License, Promotion and Other Commercial Agreements
Revenue remaining performance obligation														$ 0
Sale of active pharmaceutical ingredient | Astellas Pharma Inc., 2009 License Agreement
Collaboration, License, Promotion and Other Commercial Agreements
Revenue												27,500
Sale of active pharmaceutical ingredient | Astellas Pharma Inc., 2009 License Agreement, Amended 2019
Collaboration, License, Promotion and Other Commercial Agreements
Revenue											2,000	$ 18,300
Royalty | Astellas Pharma Inc., 2009 License Agreement, Amended 2019
Collaboration, License, Promotion and Other Commercial Agreements
Revenue											$ 2,100

XML

Collaboration, License, Promotion and Other Commercial Agreements - China, Hong Kong and Macau (Details) $ in Thousands	1 Months Ended	3 Months Ended								12 Months Ended
	Jan. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) installment	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Collaboration, License, Promotion and Other Commercial Agreements
Revenue		$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Collaborative arrangements revenue
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										381,545	379,652	272,839
Sale of active pharmaceutical ingredient
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										7,978	48,761	70,355
AstraZeneca | Collaborative arrangement, collaboration and license agreements
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										682	32,628
AstraZeneca | Sale of active pharmaceutical ingredient
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										$ 5,540	2,973
AstraZeneca | China, Hong Kong, and Macau
Collaboration, License, Promotion and Other Commercial Agreements
Percentage of net loss from commercialization (as a percent)										55.00%
Pre-launch commercial services and supply chain services											1,200	$ 900
AstraZeneca | China, Hong Kong, and Macau | Collaborative arrangements revenue
Collaboration, License, Promotion and Other Commercial Agreements
Collaborative arrangement, significant financing component, transaction price		2,600								$ 2,600
Collaborative arrangement, expected interest income		$ 2,600								2,600
AstraZeneca | China, Hong Kong, and Macau | Collaborative arrangement, collaboration agreements
Collaboration, License, Promotion and Other Commercial Agreements
Milestone payment to be received by company upon milestone achievement										90,000
Amount of non-contingent arrangement consideration										$ 35,000
Non-contingent consideration installments | installment										3
Percentage of tiered royalties										20.00%
AstraZeneca | China, Hong Kong, and Macau | Collaborative arrangement, transition services agreement
Collaboration, License, Promotion and Other Commercial Agreements
Regulatory and administrative services initial term										2 years
AstraZeneca | China, Hong Kong, and Macau | Subsequent Event | Collaborative arrangement, collaboration agreements
Collaboration, License, Promotion and Other Commercial Agreements
Non-contingent arrangement consideration installment received	$ 10,000
AstraZeneca License Agreement | Collaborative arrangement, collaboration and license agreements
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										$ 700	32,600
AstraZeneca License Agreement | Collaborative arrangement, collaboration agreements
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										32,400	32,400
AstraZeneca License Agreement | Collaborative arrangement, transition services agreement
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										600	$ 200
AstraZeneca License Agreement | Royalty
Collaboration, License, Promotion and Other Commercial Agreements
Revenue										$ 100

XML

Collaboration, License, Promotion and Other Commercial Agreements - Promotion Agreements (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Collaboration, License, Promotion and Other Commercial Agreements
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Deferred revenue	0				900				0	900
Collaborative arrangements revenue
Collaboration, License, Promotion and Other Commercial Agreements
Revenue									381,545	379,652	$ 272,839
Alnylam | Collaborative arrangement, promotion agreements
Collaboration, License, Promotion and Other Commercial Agreements
Total annual service fees due	5,500								5,500
Revenue									3,500	2,000
Deferred revenue	$ 0				$ 900				0	900
Alnylam | Royalty
Collaboration, License, Promotion and Other Commercial Agreements
Revenue									$ 800	$ 0

XML

Fair Value of Financial Instruments - General Information (Details)	Dec. 31, 2020
Fair Value of Financial Instruments
Threshold percentage of collateralized value (as a percent)	102.00%

XML

Fair Value of Financial Instruments - Measured on Recurring Basis (Details) - Recurring basis - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets:
Convertible note hedges	$ 13,065	$ 31,366
Total assets measured at fair value	364,300	210,577
Liabilities:
Note hedge warrants	12,088	24,260
Total liabilities measured at fair value	12,088	24,260
Money market funds
Assets:
Cash and cash equivalents	349,014	139,190
Restricted cash	2,221	2,221
Repurchase agreements
Assets:
Cash and cash equivalents		37,800
Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total assets measured at fair value	351,235	179,211
Quoted Prices in Active Markets for Identical Assets (Level 1) | Money market funds
Assets:
Cash and cash equivalents	349,014	139,190
Restricted cash	2,221	2,221
Quoted Prices in Active Markets for Identical Assets (Level 1) | Repurchase agreements
Assets:
Cash and cash equivalents		37,800
Significant Unobservable Inputs (Level 3)
Assets:
Convertible note hedges	13,065	31,366
Total assets measured at fair value	13,065	31,366
Liabilities:
Note hedge warrants	12,088	24,260
Total liabilities measured at fair value	$ 12,088	$ 24,260

XML

Fair Value of Financial Instruments - Transfers Between Fair Value Measurement Levels (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Fair value transfers
Fair value transfer between measurement levels	$ 0	$ 0

XML

Fair Value of Financial Instruments - Assumptions - Convertible Note Hedges (Details)	Dec. 31, 2020 $ / shares Y	Dec. 31, 2019 $ / shares Y
Fair Value of Financial Instruments
Derivative asset, valuation technique	us-gaap:ValuationTechniqueOptionPricingModelMember	us-gaap:ValuationTechniqueOptionPricingModelMember
Measurement Input, Risk Free Interest Rate
Fair Value of Financial Instruments
Derivative asset, measurement input	0.001	0.016
Measurement Input, Expected Term
Fair Value of Financial Instruments
Derivative asset, measurement input | Y	1.5	2.5
Measurement Input, Share Price
Fair Value of Financial Instruments
Derivative asset, measurement input	11.39	13.31
Measurement Input, Exercise Price
Fair Value of Financial Instruments
Derivative asset, measurement input	14.51	14.51
Measurement Input, Price Volatility
Fair Value of Financial Instruments
Derivative asset, measurement input	0.467	0.491
Measurement Input, Expected Dividend Rate
Fair Value of Financial Instruments
Derivative asset, measurement input	0	0

XML

Fair Value of Financial Instruments - Assumptions - Note Hedge Warrants (Details)	Dec. 31, 2020 $ / shares Y	Dec. 31, 2019 Y $ / shares
Fair Value of Financial Instruments
Derivative liability, valuation technique	us-gaap:ValuationTechniqueOptionPricingModelMember	us-gaap:ValuationTechniqueOptionPricingModelMember
Measurement Input, Risk Free Interest Rate
Fair Value of Financial Instruments
Derivative liability, measurement input	0.001	0.016
Measurement Input, Expected Term
Fair Value of Financial Instruments
Derivative liability, measurement input | Y	2.0	3.0
Measurement Input, Share Price
Fair Value of Financial Instruments
Derivative liability, measurement input	11.39	13.31
Measurement Input, Exercise Price
Fair Value of Financial Instruments
Derivative liability, measurement input	18.82	18.82
Measurement Input, Price Volatility
Fair Value of Financial Instruments
Derivative liability, measurement input	0.503	0.465
Measurement Input, Expected Dividend Rate
Fair Value of Financial Instruments
Derivative liability, measurement input	0	0

XML

Fair Value of Financial Instruments - Change in Level 3 - Convertible Note Hedges (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Level 3 Assets
Balance at beginning of period	$ 31,366	$ 41,020
Cash settlement (received) upon early termination of derivatives		(28,909)
Change in fair value, recorded as a component of (loss) gain on derivatives	(18,301)	19,255
Balance at end of period	$ 13,065	$ 31,366

XML

Fair Value of Financial Instruments - Change in Level 3 - Note Hedge Warrants (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Change in Level 3 Liabilities
Balance at beginning of period	$ (24,260)	$ (33,763)
Cash settlement paid upon early termination of derivatives		25,735
Change in fair value, recorded as a component of gain (loss) on derivatives	12,172	(16,232)
Balance at end of period	$ (12,088)	$ (24,260)

XML

Fair Value of Financial Instruments - Notes Payable (Details) - Convertible Senior Notes - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2019	Jun. 30, 2015
2.25% Convertible Senior Notes due 2022
Fair value disclosures
Debt redeemed/repurchased			$ 215,000
Aggregate principal amount of notes issued	$ 120,699	$ 120,699		$ 335,700
2.25% Convertible Senior Notes due 2022 | Significant Other Observable Inputs (Level 2)
Fair value disclosures
Estimated fair value	130,200	141,300
0.75% Convertible Senior Notes due 2024
Fair value disclosures
Aggregate principal amount of notes issued	200,000	200,000	200,000
0.75% Convertible Senior Notes due 2024 | Significant Other Observable Inputs (Level 2)
Fair value disclosures
Estimated fair value	222,300	235,700
1.50% Convertible Senior Notes due 2026
Fair value disclosures
Aggregate principal amount of notes issued	200,000	200,000	$ 200,000
1.50% Convertible Senior Notes due 2026 | Significant Other Observable Inputs (Level 2)
Fair value disclosures
Estimated fair value	$ 224,100	$ 240,100

XML

Fair Value of Financial Instruments - Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes (Details) - Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes	1 Months Ended
	Aug. 31, 2019 $ / shares $ / item shares
Capped Calls
Number of shares covered by capped calls (in shares) | shares	29,867,480
Strike price (in dollars per share) | $ / shares	$ 13.39
Cap price | $ / item	17.05

XML

Leases - General Information (Details) - Accounting Standards Update 2016-02	12 Months Ended
	Dec. 31, 2020
New Accounting Pronouncements
Change in Accounting Principle, Accounting Standards Update, Adopted	true
Change in Accounting Principle, Accounting Standards Update, Adoption Date	Jan. 01, 2019
Change in Accounting Principle, Accounting Standards Update, Transition Option Elected	us-gaap:AccountingStandardsUpdate201602CumulativeEffectPeriodOfAdoptionMember

XML

Leases - Lease Cost - Tabular Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease cost
Operating lease cost during period	$ 2,530	$ 16,452
Variable lease payments		1,526
Short-term lease cost	1,420	1,512
Total lease cost	$ 3,950	$ 19,490

XML

Leases - Lease Cost - Sublease Income (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease cost
Sublease income	$ 0.3

XML

Leases - Operating Leases - Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Operating leases
Right-of-use assets obtained in exchange for new operating lease upon adoption of ASC 842		$ 88,299
Adjustment to right-of-use assets as a result of the lease modification upon Separation		(40,427)
Adjustment to right-of-use assets as a result of the termination of the Binney Street Lease		(34,440)
Right-of-use assets obtained in exchange for new operating lease liabilities upon execution of Summer Street Lease		18,452
Cash paid for amounts included in the measurement of lease liabilities	$ 1,146	$ 18,598
Weighted-average remaining lease term of operating leases (in years)	9 years 3 months 18 days	10 years 2 months 12 days
Weighted-average discount rate of operating leases (as a percent)	5.80%	5.80%

XML

Leases - Operating Leases - Future Minimum Lease Payments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Future minimum lease payments
2021	$ 3,128
2022	3,129
2023	3,065
2024	3,126
2025	3,189
2026 and thereafter	14,856
Total future minimum lease payments	$ 30,493

XML

Leases - Operating Leases - Operating Lease Obligations (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Operating lease obligations
Total future minimum lease payments	$ 30,493
Less: present value adjustment	(7,047)
Operating lease liabilities	23,446
Less: current portion of operating lease liabilities	(3,128)	$ (1,146)
Operating lease liabilities, net of current portion	$ 20,318	$ 22,082

XML

Leases - Operating Leases - Summer Street Lease (Details) ft² in Thousands, $ in Thousands		12 Months Ended
	Jun. 11, 2019 ft²	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Operating leases
Restricted cash, noncurrent		$ 485	$ 971
Weighted-average discount rate of operating leases (as a percent)		5.80%	5.80%
Operating lease right-of-use assets		$ 16,576	$ 17,743
Operating lease liability		23,446
Asset retirement obligation			486
Operating lease cost		2,530	16,452
Summer Street Lease
Operating leases
Option to extend the term of the lease	true
Rentable area leased (in square feet) | ft²	39
Operating lease, renewal term	5 years
Annual rent escalation (as a percent)	2.00%
Restricted cash, noncurrent		$ 1,000
Weighted-average discount rate of operating leases (as a percent)		5.80%
Operating lease right-of-use assets		$ 16,600	17,700
Operating lease cost		2,500	1,500
Lease liability, net of tenant improvement allowance reimbursement		$ 23,200	$ 22,800

XML

Leases - Operating Leases - Binney Street Lease (Details) $ in Thousands			12 Months Ended
	Jun. 11, 2019 USD ($) ft²	Apr. 01, 2019 ft²	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)
Operating leases
Weighted-average discount rate of operating leases (as a percent)			5.80%	5.80%
Operating lease cost			$ 2,530	$ 16,452
Sublease income				300
Restricted cash, noncurrent			485	971
Operating lease right-of-use assets			16,576	17,743
Operating lease liability			$ 23,446
Binney Street Lease
Operating leases
Rentable area leased (in square feet) | ft²	108,000	108,000
Surrendered space (in square feet) | ft²		114,000
Weighted-average discount rate of operating leases (as a percent)	4.00%	5.10%
Gain on modification of lease				3,200
Lease termination cost	$ 9,000
Operating lease cost				16,300
Sublease income				$ 300
Operating lease right-of-use assets						$ 87,700
Rent expense					$ 10,000
Operating lease liability						$ 94,300

XML

Leases - Operating Leases - Vehicle Fleet Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Apr. 30, 2018
Operating leases
Restricted cash, current	$ 1,735	$ 1,250
Operating lease cost	2,530	16,452
Vehicles, 2018 Vehicle Leases
Operating leases
Operating lease, term				12 months
Operating lease, renewal term				1 month
Restricted cash, current	1,300	1,300
Operating lease cost	$ 1,400	$ 1,500
Rent expenses			$ 800

XML

Property and Equipment - Tabular Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Property and Equipment
Property and equipment, gross	$ 20,734	$ 22,511
Less accumulated depreciation and amortization	(11,805)	(10,082)
Property and equipment, net	8,929	12,429
Software
Property and Equipment
Property and equipment, gross	8,615	9,568
Leasehold improvements
Property and Equipment
Property and equipment, gross	7,407	7,318
Laboratory equipment
Property and Equipment
Property and equipment, gross	1,898	2,193
Furniture and fixtures
Property and Equipment
Property and equipment, gross	1,517	1,508
Computer and office equipment
Property and Equipment
Property and equipment, gross	$ 1,297	1,293
Construction in process
Property and Equipment
Property and equipment, gross		$ 631

XML

Property and Equipment - Expenses (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property and Equipment
Depreciation and amortization	$ 2.3	$ 5.6	$ 3.9

XML

Property and Equipment - Restructuring (Details) $ in Millions	12 Months Ended
	Dec. 31, 2020 USD ($)
Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020
Impairment of Long-Lived Assets
Impairment of long-lived assets	$ 1.2

XML

Accrued Expenses and Other Current Liabilities - Tabular Disclosure (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Expenses
Accrued incentive compensation	$ 8,719	$ 11,760
Accrued vacation	2,625	2,540
Professional fees	530	1,421
Salaries	627	2,973
Other employee benefits	1,442	1,260
Restructuring liabilities	10,510	179
Other	2,033	10,332
Total accrued expenses and other current liabilities	$ 26,486	$ 30,465

XML

Accrued Expenses and Other Current Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Accrued Expenses
Other accrued expenses	$ 2,033	$ 10,332
Other accrued liabilities, uninvoiced vendor liabilities	300
Other accrued expenses, goods received but not yet invoiced		4,100
Other accrued expenses, move activities		900
Other accrued expenses, unbilled inventories		600
Accrued interest	$ 1,600	300
Other accrued expenses, equipment for clinical studies		$ 200

XML

Notes Payable - 8.375% Notes Due 2026 (Details) - USD ($) $ in Thousands		12 Months Ended
	Sep. 23, 2016	Dec. 31, 2019	Dec. 31, 2020	Sep. 16, 2019	Aug. 31, 2019
Notes Payable
Debt issuance costs capitalized			$ 6,543
Loss on extinguishment of debt		$ 30,977
8.375% Notes due 2026 | Notes Payable
Notes Payable
Stated interest rate (as a percent)	8.375%		8.375%
Aggregate principal amount of notes issued	$ 150,000
Net proceed received	11,200
Debt issuance costs capitalized	$ 500
Debt redeemed/repurchased					$ 116,500
Debt redemption/repurchase price				$ 123,000
Loss on extinguishment of debt		$ 7,600
Percentage of net sales to determine quarterly payments (as a percent)	7.50%

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Notes Payable - Convertible Senior Notes - General Information (Details)			1 Months Ended		12 Months Ended
	Aug. 31, 2019 USD ($)	Apr. 15, 2019 USD ($) $ / shares shares	Aug. 31, 2019 USD ($)	Jun. 30, 2015 USD ($) D $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($)	Sep. 16, 2019
Notes Payable
Payments for convertible note hedges			$ 25,200,000	$ 21,100,000
Net proceeds received						$ 400,000,000
Proceeds from partial termination of convertible note hedges and note hedge warrants			3,200,000			3,174,000
Loss on extinguishment of debt						30,977,000
Equity component of convertible senior notes						92,502,000
Convertible Note Hedge
Notes Payable
Conversion price (in dollars per share) | $ / shares		$ 14.51			$ 16.58
Shares issuable upon conversion of debt (in shares) | shares					20,249,665
2.25% Convertible Senior Notes due 2022 | Note Hedge Warrants
Notes Payable
Shares issuable upon conversion of debt (in shares) | shares		23,135,435
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes
Notes Payable
Aggregate principal amount of notes issued				335,700,000	$ 120,699,000	$ 120,699,000
Net proceed received				324,000,000.0
Fees and expenses				$ 11,700,000
Stated interest rate (as a percent)				2.25%			2.25%
Conversion rate, number of shares to be issued per		68.9172		60.3209
Principal amount used for debt instrument conversion ratio		$ 1,000		$ 1,000
Conversion price (in dollars per share) | $ / shares		$ 14.51		$ 16.58
Shares issuable upon conversion of debt (in shares) | shares		23,135,435		20,249,665
Number of trading days | D				20
Consecutive trading days | D				30
Minimum percentage of stock price				130.00%
Number of business days immediately after any five consecutive trading day period during the measurement period | D				5
Number of consecutive trading days before five business days during the measurement period | D				5
Repurchase price, as percentage of principal amount, if company undergoes change of control				100.00%
Maximum period of the sole remedy for event failures in the Indenture					180 days
Amortization period				7 years
Debt redeemed/repurchased	$ 215,000,000.0		215,000,000.0
Debt redemption/repurchase price	227,300,000		227,300,000
Loss on extinguishment of debt	$ 23,400,000		23,400,000
Equity component of convertible senior notes			27,000,000.0
Initial debt issuance costs			$ 2,800,000
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes | Minimum
Notes Payable
Percentage of aggregate principal amount payable, in case of event of default				25.00%
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes | Maximum
Notes Payable
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate				98.00%

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Notes Payable - Convertible Senior Notes - Balances (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Aug. 31, 2019	Jun. 30, 2015
Liability component:
Long-term Debt, Gross	$ 546,523
Less: unamortized debt discount	(83,900)
Less: unamortized debt issuance costs	(6,543)
Net carrying amount	430,256
Convertible Senior Notes
Liability component:
Less: unamortized debt discount	(83,900)	$ (104,700)
Less: unamortized debt issuance costs	(6,543)	(8,005)
Net carrying amount	430,256	407,994
Total equity component	112,309	112,309
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes
Liability component:
Aggregate principal amount of notes issued	120,699	120,699		$ 335,700
Total equity component	19,807	19,807
0.75% Convertible Senior Notes due 2024 | Convertible Senior Notes
Liability component:
Aggregate principal amount of notes issued	200,000	200,000	$ 200,000
Total equity component	41,152	41,152
1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes
Liability component:
Aggregate principal amount of notes issued	200,000	200,000	$ 200,000
Total equity component	$ 51,350	$ 51,350

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Notes Payable - Convertible Senior Notes - Additional Information (Details) - 2.25% Convertible Senior Notes due 2022 - Convertible Senior Notes - USD ($) $ in Millions	1 Months Ended
	Jun. 30, 2015	Dec. 31, 2020	Jun. 30, 2019
Notes Payable
Debt issuance costs incurred	$ 11.7
Debt issuance costs allocated to equity components	4.0
Debt issuance costs allocated to liability components	$ 7.7
Debt instrument term	7 years
Effective interest rate on liability components		9.70%	9.34%

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Notes Payable - Convertible Senior Notes - Total Interest Expense (Details) - 2.25% Convertible Senior Notes due 2022 - Convertible Senior Notes - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest Expense
Contractual interest expense	$ 7,216	$ 7,361	$ 7,553
Amortization of debt issuance costs	1,462	1,190	971
Amortization of debt discount	20,800	17,683	15,437
Total interest expense	$ 29,478	$ 26,234	$ 23,961

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Notes Payable - Convertible Senior Notes - Future Minimum Payments (Details) $ in Thousands	Dec. 31, 2020 USD ($)
Future minimum payments of Convertible senior notes
2021	$ 7,216
2022	126,557
2023	4,500
2024	203,750
2025	3,000
2026	201,500
Total future minimum payments under the convertible senior notes	546,523
Less: amounts representing interest	(25,824)
Less: unamortized debt discount	(83,900)
Less: unamortized debt issuance costs	(6,543)
Net carrying amount	$ 430,256

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Notes Payable - 0.75% Convertible Senior Notes Due 2024 and 1.50% Convertible Senior Notes Due 2026 (Details)				1 Months Ended
	Aug. 12, 2019	Aug. 07, 2019 USD ($) $ / shares	Apr. 15, 2019 USD ($) $ / shares shares	Aug. 31, 2019 USD ($) D	Jun. 30, 2015 USD ($) D $ / shares shares	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 16, 2019
Notes Payable
Payments for convertible note hedges				$ 25,200,000	$ 21,100,000
Repurchase price				100.00%
Percentage of aggregate principal amount of notes outstanding and payable in case of event of default under the agreement				25.00%
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes
Notes Payable
Aggregate principal amount of notes issued					335,700,000	$ 120,699,000	$ 120,699,000
Net proceed received					324,000,000.0
Fees and expenses					$ 11,700,000
Stated interest rate (as a percent)					2.25%			2.25%
Conversion rate, number of shares to be issued per			68.9172		60.3209
Principal amount used for debt instrument conversion ratio			$ 1,000		$ 1,000
Initial conversion price (in dollars per share) | $ / shares			$ 14.51		$ 16.58
Shares issuable upon conversion of debt (in shares) | shares			23,135,435		20,249,665
Number of trading days | D					20
Consecutive trading days | D					30
Minimum percentage of stock price					130.00%
Number of business days immediately after any five consecutive trading day period during the measurement period | D					5
Number of consecutive trading days before five business days during the measurement period | D					5
Repurchase price, as percentage of principal amount, if company undergoes change of control					100.00%
Amortization period					7 years
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes | Minimum
Notes Payable
Percentage of aggregate principal amount payable, in case of event of default					25.00%
2.25% Convertible Senior Notes due 2022 | Convertible Senior Notes | Maximum
Notes Payable
Percentage of the trading price to the product of the sale price of the entity's common stock and the conversion rate					98.00%
0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes
Notes Payable
Net proceed received				$ 391,000,000.0
Fees and expenses				9,000,000.0
Conversion rate, number of shares to be issued per	74.6687
Principal amount used for debt instrument conversion ratio		$ 1,000		$ 1,000
Initial conversion price (in dollars per share) | $ / shares		$ 13.39
Number of consecutive trading days before five business days during the measurement period | D				5
0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes | Calendar quarter commencing after December 31, 2019
Notes Payable
Number of trading days | D				20
Consecutive trading days | D				30
0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes | Measurement period
Notes Payable
Number of business days immediately after any five consecutive trading day period during the measurement period | D				5
0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes | Minimum | Calendar quarter commencing after December 31, 2019
Notes Payable
Minimum percentage of stock price				130.00%
0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes | Maximum | Measurement period
Notes Payable
Conversion premium percentage on sale price of common stock				98.00%
0.75% Convertible Senior Notes due 2024 | Convertible Senior Notes
Notes Payable
Aggregate principal amount of notes issued				$ 200,000,000.0		200,000,000	200,000,000
Stated interest rate (as a percent)	0.75%
Amortization period				5 years
1.50% Convertible Senior Notes due 2026 | Convertible Senior Notes
Notes Payable
Aggregate principal amount of notes issued				$ 200,000,000.0		$ 200,000,000	$ 200,000,000
Stated interest rate (as a percent)	1.50%
Amortization period				7 years

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Notes Payable - 2.25% Convertible Senior Notes Due 2022, 0.75% Convertible Senior Notes Due 2024 and 1.50% Convertible Senior Notes Due 2026 (Details) - Convertible Senior Notes - USD ($) $ in Millions	1 Months Ended
	Aug. 31, 2019	Jun. 30, 2015	Dec. 31, 2020	Jun. 30, 2019
2.25% Convertible Senior Notes due 2022
Notes Payable
Debt issuance costs incurred		$ 11.7
Debt issuance costs allocated to equity components		4.0
Debt issuance costs allocated to liability components		$ 7.7
Debt instrument term		7 years
Effective interest rate on liability components			9.70%	9.34%
0.75% Convertible Senior Notes due 2024 and 1.50% Convertible Senior Notes due 2026
Notes Payable
Debt issuance costs incurred	$ 9.0
Debt issuance costs allocated to equity components	2.1
Debt issuance costs allocated to liability components	$ 6.9
0.75% Convertible Senior Notes due 2024
Notes Payable
Debt instrument term	5 years
Effective interest rate on liability components			6.30%
1.50% Convertible Senior Notes due 2026
Notes Payable
Debt instrument term	7 years
Effective interest rate on liability components			6.60%

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Notes Payable - Convertible Note Hedge and Warrant Transactions (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2015	Dec. 31, 2020	Dec. 31, 2019	Apr. 15, 2019
Notes Payable
Long-term asset		$ 13,065	$ 31,366
Long-term liability		$ 12,088	$ 24,260
Net derivative issuance cost	$ 21,100
Convertible Note Hedge
Notes Payable
Shares issuable upon conversion of debt (in shares)		20,249,665
Conversion price (in dollars per share)		$ 16.58		$ 14.51
Long-term asset	91,900
Note Hedge Warrant Derivatives
Notes Payable
Shares into which warrants may be converted (in shares)		20,249,665
Trading day period		150 days
Long-term liability	$ 70,800
Note Hedge Warrants
Notes Payable
Warrants strike price (in dollars per share)		$ 21.50		$ 18.82

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Notes Payable - Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes (Details) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2019 USD ($) $ / shares $ / item shares	Dec. 31, 2019 USD ($)
Capped Calls
Purchase of capped calls		$ 25,159
Equity component of issuance costs for convertible senior notes		$ 2,092
Capped Calls with Respect to 2024 Convertible Notes and 2026 Convertible Notes
Capped Calls
Payment made to enter into Capped Calls	$ 25,200
Strike price (in dollars per share) | $ / shares	$ 13.39
Cap price | $ / item	17.05
Number of shares covered by capped calls (in shares) | shares	29,867,480
Purchase of capped calls	$ 25,000
Equity component of issuance costs for convertible senior notes	$ 200

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Commitments and Contingencies - Guarantees (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Indemnification Agreement
Guarantees
Liabilities recorded	$ 0	$ 0

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Commitments and Contingencies - Litigation (Details) $ in Millions	12 Months Ended
	Dec. 31, 2018 USD ($)
Mylan
Litigation Settlement [Abstract]
Litigation settlement amount	$ 4.0

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Stockholders' Equity (Details)	12 Months Ended
	Dec. 31, 2020 Vote
Common stock
Number of voting rights per share	1
Description of the number of voting rights per share	one

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Employee Stock Benefit Plans - Summary of Expense Recognized by Share-based Compensation Arrangement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	$ 31,175	$ 31,278	$ 41,082
Stock options
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	7,680	12,526	20,478
Time-based Restricted Stock Units
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	18,624	15,488	17,160
Performance-based Restricted Stock Units
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	2,190
Restricted Stock
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	1,886	2,095	2,330
Employee Stock Purchase Plan
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	722	1,115	1,097
Stock awards
Employee Stock Benefit Plans
Expense recognized for share-based compensation arrangements	$ 73	$ 54	$ 17

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Employee Stock Benefit Plans - Share-based Compensation Reflected in the Consolidated Statement of Operations (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Benefit Plans
Share-based compensation expense	$ 31,175	$ 31,278	$ 41,082
Research and development
Employee Stock Benefit Plans
Share-based compensation expense	5,569	6,343	11,500
Selling, general and administrative
Employee Stock Benefit Plans
Share-based compensation expense	23,825	24,281	27,440
Restructuring expenses
Employee Stock Benefit Plans
Share-based compensation expense	$ 1,781	$ 654	$ 2,142

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Employee Stock Benefit Plans - Separation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Employee Stock Benefit Plans
Share-based compensation expense	$ 31,175	$ 31,278	$ 41,082
Employee Stock Purchase Plan
Employee Stock Benefit Plans
Share-based compensation expense	$ 722	1,115	$ 1,097
Spin-off | Share-based Payment Awards, Excluding Employee Stock Purchase Plan
Employee Stock Benefit Plans
Share-based compensation expense		0
Spin-off | Employee Stock Purchase Plan
Employee Stock Benefit Plans
Share-based compensation expense		$ 300

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Employee Stock Benefit Plans - Share-based Compensation Expense (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($)
Employee Stock Benefit Plans
Share-based compensation expense, other modifications	$ 3.0

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Employee Stock Benefit Plans - Stock Benefit Plans (Details) - shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2010
2010 Plan | Employee Stock Purchase Plan
Stock Benefit Plans
Purchase price as a percentage of fair market value of a share of common stock on the first or last day of an offering period (as a percent)		85.00%
Offering period		6 months
Shares reserved for issuance (in shares)		400,000
Threshold number of additional shares available for future grant (in shares)	1,000,000
Shares available for future grant (in shares)	4,705,393
2010 Plan | Employee Stock Purchase Plan | Class A common stock
Stock Benefit Plans
Percentage for the threshold number of additional shares available for future grant, expressed as percentage of common stock outstanding on the last day of the immediately preceding fiscal year (as a percent)	1.00%
2019 Equity plan
Stock Benefit Plans
Shares available for future grant (in shares)	9,651,783
2019 Equity plan | Class A common stock
Stock Benefit Plans
Shares reserved for issuance (in shares)	10,000,000
2005 Equity Plan
Stock Benefit Plans
Shares available for future grant (in shares)	0
2019 Equity Plan and 2010 Purchase Plan
Stock Benefit Plans
Shares available for future grant (in shares)	14,357,176

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Employee Stock Benefit Plans - Restricted Stock Awards - Activity (Details) - Restricted Stock - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding at the beginning of the period (in shares)	181,648
Granted (in shares)	246,500
Vested and released (in shares)	(181,648)
Outstanding at the end of the period (in shares)	246,500	181,648
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 10.76
Granted (in dollars per share)	10.16	$ 10.96	$ 18.58
Vested and released (in dollars per share)	10.46
Outstanding at the end of the period (in dollars per share)	$ 10.38	$ 10.76

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Employee Stock Benefit Plans - Restricted Stock Awards - Weighted-average Grant Date Fair Value (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restricted Stock
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value (in dollars per share)	$ 10.16	$ 10.96	$ 18.58

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Employee Stock Benefit Plans - Restricted Stock Units (Details)	12 Months Ended
	Dec. 31, 2018 shares
Restricted Stock Units
Stock Benefit Plans
Right to number of shares of common stock per RSU (in shares)	1

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Employee Stock Benefit Plans - Time-based RSUs - Vesting (Details) - Time-based Restricted Stock Units	12 Months Ended
	Dec. 31, 2020
Minimum
Stock Benefit Plans
Vesting period	2 years
Maximum
Stock Benefit Plans
Vesting period	4 years

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Employee Stock Benefit Plans - Time-based RSUs - Activity (Details) - Time-based Restricted Stock Units - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Number of Shares
Outstanding at the beginning of the period (in shares)	3,207,089
Granted (in shares)	2,708,200
Vested and released (in shares)	(965,625)
Forfeited (in shares)	(779,038)
Outstanding at the end of the period (in shares)	4,170,626	3,207,089
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share)	$ 12.33
Granted (in dollars per share)	11.59	$ 12.11	$ 15.63
Vested and released (in dollars per share)	12.37
Forfeited (in dollars per share)	11.96
Outstanding at the end of the period (in dollars per share)	$ 11.90	$ 12.33

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Employee Stock Benefit Plans - Time-based RSUs - Weighted-average Grant Date Fair Value (Details) - $ / shares	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Time-based Restricted Stock Units
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value (in dollars per share)	$ 11.59	$ 12.11	$ 15.63

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Employee Stock Benefit Plans - Performance-based RSUs - Vesting (Details) - Performance-based Restricted Stock Units	12 Months Ended
	Dec. 31, 2020
Share-based Payment Arrangement, Tranche One
Stock Benefit Plans
Vesting period	2 years
Share-based Payment Arrangement, Tranche Two
Stock Benefit Plans
Vesting period	3 years

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Employee Stock Benefit Plans - Performance-based RSUs - Assumptions (Details) - Performance-based Restricted Stock Units	12 Months Ended
	Dec. 31, 2020 $ / shares
Weighted-average assumptions used to estimate fair value
Fair value of common stock (in dollars per share)	$ 11.78
Expected volatility (as a percent)	53.30%
Expected term	2 years 9 months 18 days
Risk-free interest rate (as a percent)	1.00%
Expected dividend yield (as a percent)	0.00%

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Employee Stock Benefit Plans - Performance-based RSUs - Activity (Details) - Performance-based Restricted Stock Units	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Number of Shares
Outstanding at the beginning of the period (in shares) | shares	0
Granted (in shares) | shares	586,157
Outstanding at the end of the period (in shares) | shares	586,157
Weighted-Average Grant Date Fair Value
Outstanding at the beginning of the period (in dollars per share) | $ / shares	$ 0
Granted (in dollars per share) | $ / shares	12.48
Outstanding at the end of the period (in dollars per share) | $ / shares	$ 12.48

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Employee Stock Benefit Plans - Performance-based RSUs - Weighted-average Grant Date Fair Value (Details)	12 Months Ended
	Dec. 31, 2020 $ / shares
Performance-based Restricted Stock Units
Weighted-Average Grant Date Fair Value
Weighted-average grant date fair value (in dollars per share)	$ 12.48

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Employee Stock Benefit Plans - Stock Options - General Information (Details)	12 Months Ended
	Dec. 31, 2020
Stock Benefit Plans
Expiration period	10 years
Stock options
Stock Benefit Plans
Vesting period	4 years

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Employee Stock Benefit Plans - Stock Options - Assumptions (Details) - Stock options	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Weighted-average assumptions used to estimate fair value
Expected volatility (as a percent)	46.60%	46.30%	43.70%
Expected term	6 years 1 month 6 days	6 years 1 month 6 days	6 years
Risk-free interest rate (as a percent)	1.50%	2.50%	2.70%
Expected dividend yield (as a percent)	0.00%	0.00%	0.00%

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Employee Stock Benefit Plans - Stock Options - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock Benefit Plans
Weighted average grant date fair value (in dollars per share)	$ 5.89	$ 6.10	$ 6.81
Share-based compensation expense	$ 31,175	$ 31,278	$ 41,082
Stock options
Stock Benefit Plans
Share-based compensation expense	$ 7,680	$ 12,526	20,478
Stock options with time-based and performance-based vesting
Stock Benefit Plans
Vested (in shares)	0	0
Share-based compensation expense	$ 0	$ 0	$ 0

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Employee Stock Benefit Plans - Stock Options - Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Number of Shares
Outstanding at the beginning of the period (in shares)	17,194,239
Granted (in shares)	55,000
Exercised (in shares)	(1,735,081)
Cancelled (in shares)	(2,054,487)
Outstanding at the end of the period (in shares)	13,459,671	17,194,239
Weighted-Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)	$ 12.13
Granted (in dollars per share)	12.84
Exercised (in dollars per share)	10.21
Cancelled (in dollars per share)	13.00
Outstanding at the end of the period (in dollars per share)	$ 12.25	$ 12.13
Vested or expected to vest
Number of Shares (in shares)	13,280,456
Weighted-Average Exercise Price (in dollars per share)	$ 12.26
Weighted Average Contractual Life	4 years 2 months 23 days
Aggregate Intrinsic Value	$ 5,575
Stock options
Weighted Average Contractual Life - Outstanding	4 years 3 months 7 days	5 years 1 month 9 days
Aggregate Intrinsic Value - Outstanding	$ 5,613	$ 25,226
Number of Shares - Exercisable (in shares)	11,963,812
Weighted-Average Exercise Price - Exercisable (in dollars per share)	$ 12.26
Weighted Average Contractual Life - Exercisable	3 years 10 months 24 days
Aggregate Intrinsic Value - Exercisable	$ 5,371

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Employee Stock Benefit Plans - Stock Options - Total Intrinsic Value (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock options
Total intrinsic value of options exercised	$ 3.5	$ 5.1	$ 20.1

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Employee Stock Benefit Plans - Unrecognized Share-based Compensation (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Stock options with time-based vesting
Unrecognized share-based compensation
Unrecognized expense, net of estimated forfeitures, options	$ 6,557
Weighted-average remaining recognition period	1 year 10 months 2 days
Stock options with time-based and performance-based vesting
Unrecognized share-based compensation
Unrecognized expense, net of estimated forfeitures, options	$ 88
Restricted Stock
Unrecognized share-based compensation
Unrecognized expense, net of estimated forfeitures, other than options	$ 1,473
Weighted-average remaining recognition period	11 months 1 day
Time-based Restricted Stock Units
Unrecognized share-based compensation
Unrecognized expense, net of estimated forfeitures, other than options	$ 26,934
Weighted-average remaining recognition period	2 years 2 months 19 days
Performance-based Restricted Stock Units
Unrecognized share-based compensation
Unrecognized expense, net of estimated forfeitures, other than options	$ 3,291
Weighted-average remaining recognition period	1 year 8 months 12 days

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Income Taxes - Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Federal Income Tax Expense (Benefit)
Federal Income Tax Expense (Benefit), Continuing Operations	$ 0	$ 0	$ 0
State Income Tax Expense (Benefit)
Income tax expense related to state income tax	2,700	0	0
Foreign Income Tax Expense (Benefit)
Foreign Income Tax Expense (Benefit), Continuing Operations	0	0	0
Income tax expense	$ 2,685	$ 0	$ 0

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Income Taxes - Federal Statutory Rate (Details)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Effective Income Tax Rate Reconciliation, Percent
Federal statutory rate (as a percent)	21.00%	21.00%	21.00%

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Income Taxes - Reconciliation of Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of income taxes
Income tax benefit using U.S. federal statutory rate	$ 22,861	$ 4,517	$ (59,297)
Permanent differences	74	65	218
State income taxes, net of federal benefit	7,565	(1,902)	(17,121)
Disallowed separation related costs		4,658
Executive compensation - Section 162(m)	1,718	662	8
Meals and entertainment	395	495	995
Non-deductible share-based compensation	(144)	(1,202)	(494)
Excess tax benefits	5,132	3,324	(1,223)
Fair market valuation of Note Hedge Warrants and Convertible Note Hedges	1,680	(290)	2,367
Tax credits	(3,149)	(4,374)	(7,863)
Expiring net operating losses and tax credits	1,991	3,764	250
Effect of change in state tax rate on deferred tax assets and deferred tax liabilities	(208)	(2,563)	1,476
Change in the valuation allowance	(35,230)	(7,154)	80,684
Income tax expense	$ 2,685	$ 0	$ 0

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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Deferred tax assets:
Net operating loss carryforwards	$ 234,772	$ 265,494
Tax credit carryforwards	60,607	59,892
Capitalized research and development	7,498	9,952
Share-based compensation	21,848	24,401
Basis difference on collaboration agreement for North America with AbbVie	62,629	48,594
Accruals and reserves	6,114	6,415
Basis difference on 2022 Notes	6,183	4,322
Interest Expense	3,386	22,020
Operating lease liability	6,504	6,421
Other	5,049	5,295
Total deferred tax assets	414,590	452,806
Deferred tax liabilities:
Basis Difference on 2024 Convertible Notes	(5,951)	(7,381)
Basis Difference on 2026 Convertible Notes	(9,022)	(10,276)
Operating lease right-of-use assets	(4,603)	(4,905)
Total deferred tax liabilities	(19,576)	(22,562)
Net deferred tax assets	395,014	430,244
Valuation allowance	(395,014)	(430,244)
Net deferred tax asset	$ 0	$ 0

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Income Taxes - Valuation Allowance (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Valuation allowance	$ 395,014	$ 430,244
(Decrease) increase in valuation allowance	$ (35,200)	$ (29,100)

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Income Taxes - Net Operating Loss Carryforwards (Details) $ in Billions	Dec. 31, 2020 USD ($)
Domestic Tax Authority
Net operating loss carryforwards
Net operating loss carryforwards	$ 1.1
Net operating loss carryforwards, subject to expiration	1.0
Net operating loss carryforwards, indefinite	0.1
State
Net operating loss carryforwards
Net operating loss carryforwards	$ 0.9

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Income Taxes - Tax Credit Carryforwards (Details) $ in Millions	Dec. 31, 2020 USD ($)
Tax credit carryforward
Tax credit carryforward	$ 65.3

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Income Taxes - Unrecognized Income Tax Benefits - Tabular Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Unrecognized income tax benefits
Unrecognized Tax Benefits, Beginning Balance	$ 53,099	$ 38,551	$ 24,078
Increases based on tax positions related to the current period	66,687	51,699	38,551
Increases for tax positions of prior periods		1,400
Decreases for tax positions in prior periods	(51,699)	(38,551)	(24,078)
Unrecognized Tax Benefits, End Balance	$ 68,087	$ 53,099	$ 38,551

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Income Taxes - Unrecognized Income Tax Benefits - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Unrecognized tax benefits
Unrecognized tax benefits	$ 68,087	$ 53,099	$ 38,551	$ 24,078
Amount of unrecognized tax benefits that, if recognized, would affect effective tax rate	800
Accrued interest and penalties from uncertain tax positions	$ 0

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Defined Contribution Plan (Details) - USD ($)	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Contribution Plan
Employer match of first $6,000 of employee contributions (as a percent)	75.00%
Amount of employee contributions matched 75% by employer	$ 6,000
Compensation cost	$ 1,800,000	$ 2,200,000	$ 3,200,000
Minimum
Defined Contribution Plan
Employee contribution per calendar year (as a percent of compensation)	1.00%
Maximum
Defined Contribution Plan
Employee contribution per calendar year (as a percent of compensation)	100.00%

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Workforce Reduction and Restructuring - Restructuring Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Expenses
Restructuring expenses	$ 15,382	$ 3,620	$ 14,715

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Workforce Reduction and Restructuring - General Information (Details) $ in Thousands	1 Months Ended					12 Months Ended
	Sep. 30, 2020 employee	Feb. 28, 2019 employee	Aug. 31, 2018 employee	Jun. 30, 2018 item employee	Jan. 31, 2018 employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)
Restructuring Expenses
Restructuring expenses						$ 15,382	$ 3,620	$ 14,715
Restructuring Accruals
Restructuring accruals						10,510	179
Employee severance, benefits and related costs
Restructuring Expenses
Restructuring expenses						11,563	3,198
Restructuring Accruals
Amounts accrued						10,902	75	2,452
Contract related costs
Restructuring Expenses
Restructuring expenses						108
Restructuring Accruals
Amounts accrued						5	104	433
Reduction in Field-based Workforce, January 30, 2018
Workforce Reduction
Number of employees eliminated | employee					60
Restructuring Expenses
Employee severance, benefits and related costs								2,400
Reduction in Headquarter-based Workforce, June 27, 2018
Workforce Reduction
Number of new businesses | item				2
Number of employees expected to be eliminated | employee				40
Restructuring Expenses
Employee severance, benefits and related costs								4,000
Reduction in Headquarter-based Workforce, June 27, 2018 | Employee severance, benefits and related costs
Restructuring Expenses
Restructuring expenses							16
Restructuring Accruals
Amounts accrued							0	696
Reduction in Workforce, Termination of Lesinurad License Agreement, August 16, 2018
Workforce Reduction
Number of employees expected to be eliminated | employee			100
Restructuring Expenses
Restructuring expenses								8,300
Reduction in Workforce, Termination of Lesinurad License Agreement, August 16, 2018 | Employee severance, benefits and related costs
Restructuring Expenses
Restructuring expenses								5,400
Restructuring Accruals
Amounts accrued							0	1,756
Reduction in Workforce, Termination of Lesinurad License Agreement, August 16, 2018 | Contract related costs
Restructuring Expenses
Restructuring expenses						0		2,900
Restructuring Accruals
Amounts accrued						0	104	433
Reduction in Workforce, February 7, 2019
Workforce Reduction
Number of employees expected to be eliminated | employee		35
Restructuring Expenses
Employee severance, benefits and related costs							3,700
Reduction in Workforce, February 7, 2019 | Employee severance, benefits and related costs
Restructuring Expenses
Restructuring expenses						0	3,182
Restructuring Accruals
Amounts accrued						0	75	$ 0
Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020
Workforce Reduction
Number of employees expected to be eliminated | employee	100
Restructuring Expenses
Restructuring expenses						15,500
Impairment of Long-Lived Assets
Impairment of long-lived assets						1,200
Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020 | Employee severance, benefits and related costs
Restructuring Expenses
Restructuring expenses						11,563
Restructuring Accruals
Amounts accrued						10,902	0
Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020 | Contract related costs
Restructuring Expenses
Restructuring expenses						108
Restructuring Accruals
Amounts accrued						$ 5	$ 0

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Workforce Reduction and Restructuring - Tabular Disclosure (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Workforce Reduction
Charges	$ 15,382	$ 3,620	$ 14,715
Reduction in Workforce, Termination of Lesinurad License Agreement, August 16, 2018
Workforce Reduction
Charges			8,300
Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020
Workforce Reduction
Charges	15,500
Employee severance, benefits and related costs
Workforce Reduction
Balance at beginning of period	75	2,452
Charges	11,563	3,198
Amounts paid	(736)	(5,365)
Adjustments		(210)
Balance at end of period	10,902	75	2,452
Employee severance, benefits and related costs | Reduction in Headquarter-based Workforce, June 27, 2018
Workforce Reduction
Balance at beginning of period	0	696
Charges		16
Amounts paid		(689)
Adjustments		(23)
Balance at end of period		0	696
Employee severance, benefits and related costs | Reduction in Workforce, Termination of Lesinurad License Agreement, August 16, 2018
Workforce Reduction
Balance at beginning of period	0	1,756
Charges			5,400
Amounts paid		(1,708)
Adjustments		(48)
Balance at end of period		0	1,756
Employee severance, benefits and related costs | Reduction in Workforce, February 7, 2019
Workforce Reduction
Balance at beginning of period	75	0
Charges	0	3,182
Amounts paid	(75)	(2,968)
Adjustments		(139)
Balance at end of period	0	75	0
Employee severance, benefits and related costs | Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020
Workforce Reduction
Balance at beginning of period	0
Charges	11,563
Amounts paid	(661)
Balance at end of period	10,902	0
Contract related costs
Workforce Reduction
Balance at beginning of period	104	433
Charges	108
Amounts paid	(103)	(287)
Adjustments	(104)	(42)
Balance at end of period	5	104	433
Contract related costs | Reduction in Workforce, Termination of Lesinurad License Agreement, August 16, 2018
Workforce Reduction
Balance at beginning of period	104	433
Charges	0		2,900
Amounts paid		(287)
Adjustments	(104)	(42)
Balance at end of period	0	104	$ 433
Contract related costs | Reduction in Workforce, Discontinued Development of IW-3718, September 29, 2020
Workforce Reduction
Balance at beginning of period	0
Charges	108
Amounts paid	(103)
Balance at end of period	$ 5	$ 0

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Selected Quarterly Financial Data (Unaudited) - Tabular Disclosure (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Selected Quarterly Financial Data
Total revenues	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
Total cost and expenses	65,296	57,852	56,719	66,716	76,709	65,280	80,638	85,663	246,583	308,290	497,309
Other expense, net	(6,884)	(9,804)	(7,509)	(9,882)	(1,735)	(45,239)	(9,294)	(4,912)	(34,079)	(61,180)	(43,476)
Net (loss) income from continuing operations					47,858	20,648	12,283	(21,846)	106,176	58,943	(194,146)
Net loss from discontinued operations								(37,438)		(37,438)	(88,222)
Net income (loss)	43,204	34,423	25,204	3,345	47,858	20,648	12,283	(59,284)	106,176	21,505	(282,368)
Comprehensive income (loss)	$ 43,204	$ 34,423	$ 25,204	$ 3,345	$ 47,858	$ 20,648	$ 12,283	$ (59,284)	$ 106,176	$ 21,505	$ (282,289)
Income (loss) per share from continuing operations, net of income taxes - basic (in dollars per share)					$ 0.31	$ 0.13	$ 0.08	$ (0.14)	$ 0.67	$ 0.38	$ (1.27)
Income (loss) per share from continuing operations, net of income taxes - diluted (in dollars per share)					0.30	0.13	0.08	(0.14)	0.66	0.38	(1.27)
Net (loss) income per share from discontinued operations - basic and diluted (in dollars per share)								(0.24)		(0.24)	(0.58)
Net income (loss) per share - basic (in dollars per share)	$ 0.27	$ 0.22	$ 0.16	$ 0.02	0.31	0.13	0.08	(0.38)	0.67	0.14	(1.85)
Net income (loss) per share - diluted (in dollars per share)	$ 0.27	$ 0.21	$ 0.16	$ 0.02	$ 0.30	$ 0.13	$ 0.08	$ (0.38)	$ 0.66	$ 0.14	$ (1.85)

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Selected Quarterly Financial Data (Unaudited) - Sale of Active Pharmaceutical Ingredient (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenues
Revenue	$ 116,680	$ 103,468	$ 89,432	$ 79,943	$ 126,301	$ 131,167	$ 102,215	$ 68,730	$ 389,523	$ 428,413	$ 346,639
AstraZeneca
Revenues
Revenue from non-contingent payments						32,400
Astellas Pharma Inc.
Revenues
Upfront fee received						$ 10,000
Sale of active pharmaceutical ingredient
Revenues
Revenue									7,978	48,761	70,355
Sale of active pharmaceutical ingredient | AstraZeneca
Revenues
Revenue									5,540	2,973
Sale of active pharmaceutical ingredient | Astellas Pharma Inc.
Revenues
Revenue									$ 2,017	$ 45,788	$ 69,599

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Selected Quarterly Financial Data (Unaudited) - Restructuring Expenses (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2019	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Expenses
Restructuring expenses		$ 15,382	$ 3,620	$ 14,715
Gain on lease modification	$ 3,200		$ 3,169

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Selected Quarterly Financial Data (Unaudited) - Gain on Lease Modification (Details) - USD ($) $ in Thousands	1 Months Ended	12 Months Ended
	Apr. 30, 2019	Dec. 31, 2019
Selected Quarterly Financial Data
Gain on lease modification	$ 3,200	$ 3,169

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Selected Quarterly Financial Data (Unaudited) - Gain (Loss) on Derivatives (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Gain (Loss) on Derivatives
Gain (loss) on derivatives	$ (6,129)	$ 3,023	$ (8,743)

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Selected Quarterly Financial Data (Unaudited) - Loss on Extinguishment of Debt (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Notes Payable
Loss on extinguishment of debt	$ 30,977