10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

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

For the quarterly period ended September 30, 2018

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 000-14656

REPLIGEN CORPORATION

(Exact name of registrant as specified in its charter)

Delaware	04-2729386
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
41 Seyon Street, Bldg. 1, Suite 100 Waltham, MA	02453
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code: (781) 250-0111

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 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. (Check one):

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 is a shell company (as defined in Rule 12b-2 of the Exchange Act.):    Yes  ☐    No  ☒

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of October 29, 2018.

Class	Number of Shares
Common Stock, par value $.01 per share		43,859,319

Table of Contents

		PAGE
PART I	FINANCIAL INFORMATION
Item 1.	Financial Statements
	Condensed Consolidated Balance Sheets as of September  30, 2018 and December 31, 2017		3
	Condensed Consolidated Statements of Comprehensive Income for the Three- and Nine-Month Periods Ended September 30, 2018 and 2017		4
	Condensed Consolidated Statements of Cash Flows for the Nine-Month Periods Ended September 30, 2018 and 2017		5
	Notes to Unaudited Condensed Consolidated Financial Statements		6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		24
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		31
Item 4.	Controls and Procedures		32
PART II	OTHER INFORMATION		33
Item 1.	Legal Proceedings		33
Item 1A.	Risk Factors		33
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		33
Item 3.	Defaults Upon Senior Securities		33
Item 4.	Mine Safety Disclosures		33
Item 5.	Other Information		33
Item 6.	Exhibits		33
Signatures			34

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PART I – FINANCIAL INFORMATION

ITEM 1. Financial Statements

REPLIGEN CORPORATION

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited, amounts in thousands, except share data)

	September 30, 2018			December 31, 2017
Assets
Current assets:
Cash and cash equivalents	$	190,304		$	173,759
Accounts receivable, less reserve for doubtful accounts of $164 at September 30, 2018 and $58 at December 31, 2017, respectively		30,784			27,585
Royalties and other receivables		46			153
Inventories, net		42,284			39,004
Prepaid expenses and other current assets		3,830			2,281
Total current assets		267,248			242,782
Property, plant and equipment, net		29,359			22,417
Intangible assets, net		136,534			144,753
Goodwill		326,977			327,333
Other assets		2,007			6,234
Total assets		762,125		$	743,519
Liabilities and stockholders’ equity
Current liabilities:
Accounts payable	$	9,482		$	7,282
Accrued liabilities		17,964			17,929
Convertible senior notes, current portion		102,400			—
Total current liabilities		129,846			25,211
Convertible senior notes, net		—			99,250
Deferred tax liabilities		21,120			25,167
Other long-term liabilities		4,672			2,343
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding		—			—
Common stock, $.01 par value, 80,000,000 shares authorized, 43,853,389 shares at September 30, 2018 and 43,587,079 shares at December 31, 2017 issued and outstanding		439			436
Additional paid-in capital		639,027			628,983
Accumulated other comprehensive loss		(11,773	)		(6,363	)
Accumulated deficit		(21,206	)		(31,508	)
Total stockholders’ equity		606,487			591,548
Total liabilities and stockholders’ equity	$	762,125		$	743,519

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

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REPLIGEN CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME

(Unaudited, amounts in thousands except share and per share data)

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
Revenue:
Product revenue	$	49,500		$	36,514		$	142,042		$	99,516
Royalty and other revenue		29			66			48			108
Total revenue		49,529			36,580			142,090			99,624
Operating expenses:
Cost of product revenue		22,183			19,987			62,939			47,913
Research and development		3,601			2,001			12,669			5,603
Selling, general and administrative		15,859			14,998			48,347			35,365
Total operating expenses		41,643			36,986			123,955			88,881
Income (loss) from operations		7,886			(406	)		18,135			10,743
Other income (expenses):
Investment income		558			102			1,251			308
Interest expense		(1,687	)		(1,618	)		(5,008	)		(4,804	)
Other (expenses) income		(134	)		(100	)		187			(548	)
Total other expenses, net		(1,263	)		(1,616	)		(3,570	)		(5,044	)
Income (loss) before income taxes		6,623			(2,022	)		14,565			5,699
Income tax provision (benefit)		1,829			(6,691	)		3,586			(10,476	)
Net income	$	4,794		$	4,669		$	10,979		$	16,175
Earnings per share:
Basic	$	0.11		$	0.11		$	0.25		$	0.44
Diluted	$	0.10		$	0.11		$	0.24		$	0.43
Weighted average shares outstanding:
Basic		43,822,472			41,236,554			43,728,503			36,435,591
Diluted		45,828,175			42,563,002			45,132,115			37,386,333
Other comprehensive income:
Unrealized gain on investments		—			—			—			5
Foreign currency translation (loss) gain		(630	)		2,025			(5,410	)		7,097
Comprehensive income	$	4,164		$	6,694		$	5,569		$	23,277

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

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REPLIGEN CORPORATION

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited, amounts in thousands)

	Nine Months Ended September 30,
	2018			2017
Cash flows from operating activities:
Net income	$	10,979		$	16,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization		11,775			6,374
Provision for doubtful accounts		107			—
Non-cash interest expense		3,160			2,958
Stock-based compensation expense		7,672			4,845
Deferred tax expense		472			(13,062	)
Loss on conversion of convertible senior notes		1			—
Loss on disposal of assets		—			64
Changes in assets and liabilities:
Accounts receivable		(1,583	)		(8,472	)
Other receivables		(149	)		196
Inventories		(4,805	)		699
Prepaid expenses and other current assets		(1,437	)		(739	)
Other assets		(1,348	)		(704	)
Accounts payable		3,354			159
Accrued liabilities		(1,070	)		(6,089	)
Long-term liabilities		87			(171	)
Net cash provided by operating activities		27,215			2,233
Cash flows from investing activities:
Acquisition of Spectrum Inc., net of cash received		—			(112,941	)
Purchases of marketable securities		—			(48	)
Redemptions of marketable securities		—			19,600
Purchases of property, plant and equipment		(8,580	)		(3,686	)
Net cash used in investing activities		(8,580	)		(97,075	)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		—			129,309
Exercise of stock options		2,374			2,035
Repayment of senior convertible notes		(11	)		—
Payment of contingent consideration		—			(1,702	)
Net cash provided by financing activities		2,363			129,642
Effect of exchange rate changes on cash and cash equivalents		(4,453	)		2,633
Net increase in cash, cash equivalents and restricted cash		16,545			37,433
Cash, cash equivalents and restricted cash, beginning of period		173,759			122,233
Cash, cash equivalents and restricted cash, end of period	$	190,304		$	159,666
Supplemental disclosure of cash flow activities:
Cash paid during the period for:
Income taxes	$	3,120		$	3,555
Interest	$	1,222		$	1,222
Non-cash investing and financing activities:
Non-cash effect of adoption of ASU 2016-16	$	5,609		$	—
Payment of contingent consideration in common stock	$	—		$	1,062
Stock tendered for acquisition of Spectrum	$	—		$	247,575
Property, plant and equipment related to lease incentives	$	2,270		$	—

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

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REPLIGEN CORPORATION

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

1. Basis of Presentation

The condensed consolidated financial statements included herein have been prepared by Repligen Corporation (the “Company”, “Repligen” or “we”) in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for Quarterly Reports on Form 10-Q and Article 10 of Regulation S-X and do not include all of the information and footnote disclosures required by U.S. GAAP. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, Repligen Sweden AB (“Repligen Sweden”), Repligen GmbH, Repligen Singapore Pte. Ltd., our former subsidiary, TangenX Technology Corporation (“TangenX,” which was acquired on December 14, 2016 and merged into the Company as of June 30, 2017) and Spectrum LifeSciences, LLC (“Spectrum,” which was acquired on August 1, 2017). All significant intercompany accounts and transactions have been eliminated in consolidation.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of only normal, recurring adjustments necessary for a fair presentation of the financial position, results of operations and cash flows. The results of operations for the interim periods presented are not necessarily indicative of results to be expected for the entire year.

Recent Accounting Standards Updates

We consider the applicability and impact of all Accounting Standards Updates on our condensed consolidated financial statements. Updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position or results of operations. Recently issued Accounting Standards Updates which we feel may be applicable to us are as follows:

Recently Issued Accounting Standard Updates – Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. (“ASU”) 2016-02, “Leases (Topic 842).” Subsequently, the FASB issued additional updates which clarify this guidance, including ASU 2018-01, “Leases (Topic 842): Land Easement Practical Expedient for Transitioning to Topic 842,” in January 2018, which allows an entity to elect an optional transition practical expedient to not evaluate land easements that exist or expired before the entity’s adoption of Topic 842, and ASU 2018-11, “Leases – Targeted Improvements (Topic 842),” in July 2018, that gives entities the option to not provide comparative period financial statements and instead apply the transition requirements as of the effective date of the new standard. The Company plans to adopt the new standard using this optional method. Pursuant to the guidance under ASU 2016-02, the Company also plans to elect the optional package of practical expedients, which will allow the Company to not reassess: (i) whether expired or existing contracts contain leases; (ii) lease classification for any expired or existing leases; and (iii) initial direct costs for any existing leases. The new standard also allows entities to make certain policy elections, some of which the Company also plans to elect, including: a policy to not record short-term leases on the balance sheet. The Company is currently working through lease contract scoping, design and implementation of transition related controls, and finalization of accounting elections. The Company is still assessing the impact this standard will have on its consolidated financial statements and disclosures; however, it anticipates that the new standard will result in the Company recording additional right of use assets and corresponding liabilities on its consolidated balance sheet.

In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income,” which gives entities the option to reclassify to retained earnings tax effects related to items that have been stranded in accumulated other comprehensive

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income as a result of the Tax Cuts and Jobs Act (the “Act”). For all entities, the guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Entities can choose whether to apply the amendments retrospectively to each period in which the effect of the Act is recognized or to apply the amendments in the period of adoption. The Company has not assessed the impact of the new standard on its consolidated financial statements but does not expect its adoption to have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” ASU 2018-13 includes amendments that aim to improve the effectiveness of fair value measurement disclosures. The amendments in this guidance modify the disclosure requirements on fair value measurements based on the concepts in FASB Concepts Statement, “Conceptual Framework for Financial Reporting – Chapter 8: Notes to Financial Statements,” including the consideration of costs and benefits. The amendments become effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements.

In August 2018, the FASB issued ASU 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.” ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The guidance also requires the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. The guidance becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements.

Recently Issued Accounting Standard Updates – Adopted During the Period

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” (“ASC 606”) which supersedes the revenue recognition requirements in Accounting Standards Codification (“ASC”) Topic 605, “Revenue Recognition,” and creates a new Topic 606, “Revenue from Contracts with Customers.” Two adoption methods are permitted: retrospectively to all prior reporting periods presented, with certain practical expedients permitted; or retrospectively with the cumulative effect of initially adopting the ASU recognized at the date of initial application. The adoption of this ASU included updates as provided under ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date”; ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net)”; ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing”; and ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients.” The Company adopted the provisions of ASC 606 using the modified retrospective method effective January 1, 2018. See Note 3 for further discussion of the effects of this standard on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 203): Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 addresses eight specific cash flow issues and clarifies their presentation and classification in the Statement of Cash Flows. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017 and is to be applied retrospectively with early adoption permitted. The Company has historically classified payments up to the amount of its contingent consideration liability recognized at the date of its acquisition as financing activities, with additional payments classified as operating activities. Because the Company has classified its contingent consideration payments as required by this standard, the adoption of this standard did not have any impact on its consolidated financial statements when applied on a retrospective basis.

In October 2016, the FASB issued ASU 2016-16, “Intra-Entity Transfers of Assets Other Than Inventory.” ASU 2016-16 requires that the income tax consequences of an intra-entity asset transfer other than inventory are recognized at the time of the transfer. An entity will continue to recognize the income tax consequences of an intercompany transfer of inventory when the inventory is sold to a third party. The Company adopted this standard on a modified-retrospective basis on January 1, 2018. See Note 12 for a discussion of the impact of this ASU on the Company’s consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash,” which requires that the statement of cash flows explain the change during the period in the total cash, which is inclusive of cash and cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. Restricted cash and restricted cash equivalents will be included with cash and cash equivalents when reconciling the beginning of period and end of period balances on the statement of cash flows upon adoption of this standard. The Company adopted this standard on a retrospective basis on January 1, 2018. The adoption resulted in an increase to cash, cash equivalents and restricted cash of $450,000 in the statement of cash flows at December 31, 2016 and September 30, 2017. The Company did not hold any restricted cash at December 31, 2017 or September 30, 2018.

In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business”, which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this standard as of January 1, 2018, and the adoption of ASU 2017-01 did not have a material impact on the Company’s consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, “Intangibles–Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” eliminating the requirement to calculate the implied fair value, essentially eliminating step two from the goodwill impairment test. ASU 2017-04 requires goodwill impairment to be based upon the results of step one of the impairment test, which is defined as the excess of the carrying value of a reporting unit over its fair value. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. The standard is effective for the Company on a prospective basis beginning on January 1, 2020, with early adoption permitted. The Company adopted this standard as of January 1, 2018, and the adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

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2. Acquisition of Spectrum LifeSciences, LLC

On August 1, 2017, the Company completed the acquisition of Spectrum pursuant to the terms of an Agreement and Plan of Merger and Reorganization, dated as of June 22, 2017 (such acquisition, the “Spectrum Acquisition”).

Spectrum is a diversified filtration company with a differentiated portfolio of hollow fiber cartridges, benchtop to commercial scale filtration and perfusion systems and a broad portfolio of disposable and single-use solutions. Spectrum’s products are primarily used for the filtration, isolation, purification and concentration of monoclonal antibodies, vaccines, recombinant proteins, diagnostic products and cell therapies where the company offers both standard and customized solutions to its bioprocessing customers.

Spectrum’s filtration products include its KrosFlo^® line of hollow fiber cartridges, tangential flow filtration (“TFF”) systems and single-use flow path consumables, as well as its Spectra/Por^® portfolio of laboratory dialysis products and its Pro-Connex^® single-use hollow fiber Module-Bag-Tubing sets. Outside of filtration, Spectrum products include Spectra/Chrom^® liquid chromatography products for research applications. These bioprocessing products account for the majority of Spectrum revenues. Spectrum also offers a line of operating room products.

Consideration Transferred

The Company accounted for the Spectrum Acquisition as a purchase of a business under ASC 805, “Business Combinations.” The Spectrum Acquisition was funded through payment of approximately $122.9 million in cash, issuance of 6,153,995 unregistered shares of the Company’s common stock totaling $247.6 million and a working capital adjustment of $425,000 for a total purchase price of $370.9 million. Under the acquisition method of accounting, the assets of Spectrum were recorded as of the acquisition date, at their respective fair values, and consolidated with those of the Company. The fair value of the net assets acquired was $370.9 million.

The consideration and purchase price information has been prepared using a valuation that required the use of significant assumptions and estimates in its preparation. Critical estimates included, but were not limited to, future expected cash flows, including projected revenues and expenses, and the applicable discount rates. These estimates were based on assumptions that the Company believes to be reasonable; however, actual results may differ from these estimates.

The total consideration transferred follows (amounts in thousands):

Cash consideration	$	122,932
Equity consideration		247,575
Working capital adjustment		425
Net assets acquired	$	370,932

Acquisition and integration-related costs are not included as a component of consideration transferred, but are expensed in the periods in which the costs are incurred. The Company has incurred $2,313,000 in integration costs related to the Spectrum Acquisition for the nine-month period ended September 30, 2018 and $7,060,000 in acquisition and integration costs for the year ended December 31, 2017. These costs are primarily included in selling, general and administrative expenses in the consolidated statements of operations.

Fair Value of Net Assets Acquired

The amounts recorded for the assets acquired and liabilities assumed are final, based on the facts and circumstances that existed as of the acquisition date. The components and allocation of the purchase price consists of the following amounts (amounts in thousands):

Cash and cash equivalents	$	10,137
Accounts receivable		5,075
Inventory		13,502
Prepaid expenses and other assets		616
Fixed assets		6,004
Deferred tax assets		1,102
Customer relationships		78,400

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Developed technology		38,560
Trademark and tradename		2,160
Non-competition agreements		960
Goodwill		265,722
Accounts payable		(1,335	)
Unrecognized tax benefit		(576	)
Accrued liabilities		(5,787	)
Deferred tax liabilities		(43,608	)
Fair value of net assets acquired	$	370,932

Of the consideration paid, $78.4 million represents the fair value of customer relationships that is amortized over the weighted average determined useful life of 15 years, and $38.6 million represents the fair value of developed technology that is amortized over a weighted average determined useful life of 20 years. $960,000 represents the fair value of non-competition agreements that are amortized over a determined life of 3 years. $2.2 million represents the fair value of trademarks and trade names that are determined to have an indefinite useful life. The aforementioned intangible assets are amortized on a straight-line basis.

The goodwill of $265.7 million represents future economic benefits expected to arise from synergies from combining operations and commercial organizations to increase market presence and the extension of existing customer relationships. None of the goodwill recorded is expected to be deductible for income tax purposes.

Revenue, Net Income and Pro Forma Presentation

The Company recorded revenue from Spectrum of $13,188,000 and $37,220,000 for the three- and nine-month periods ended September 30, 2018, respectively, and $19,394,000 from August 1, 2017, the date of acquisition, through December 31, 2017. The Company has included the operating results of Spectrum in its consolidated statements of operations since the August 1, 2017 acquisition date. The following table presents unaudited supplemental pro forma information as if the Spectrum Acquisition had occurred as of January 1, 2016 (amounts in thousands, except per share data):

	Pro-forma Nine Months Ended September 30, 2017
Total revenue		121,301
Net income		14,994
Earnings per share:
Basic	$	0.36
Diluted	$	0.36

The unaudited pro forma information for the nine-month period ended September 30, 2017 was calculated after applying the Company’s accounting policies and the impact of acquisition date fair value adjustments. The unaudited pro forma net income for the nine-month period ended September 30, 2017 was adjusted to exclude acquisition-related transaction costs, as these expenses would have been incurred in the prior year assuming the Spectrum Acquisition closed on January 1, 2016.

These unaudited pro forma condensed consolidated financial results include certain adjustments to reflect the unaudited pro forma results of operations as if the acquisition had occurred as of January 1, 2016. The unaudited pro forma information does not reflect the effect of costs or synergies that would have been expected to result from the integration of the acquisition. The unaudited pro forma information does not purport to be indicative of the results of operations that actually would have resulted had the combinations occurred at the beginning of the period presented, or of future results of the consolidated entities.

3. Revenue Recognition

Adoption of ASC Topic 606, Revenue from Contracts with Customers

The Company adopted ASC 606 on January 1, 2018, using the modified retrospective method for all contracts not completed as of the date of adoption. For contracts that were modified before the effective date, the Company reflected the aggregate effect of all modifications when identifying performance obligations and allocating transaction price in accordance with the practical expedient in paragraph ASC 606-10-65-1-(f)-4, which did not have a material effect on the

9

cumulative impact of adopting ASC 606. Results for reporting periods beginning January 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for the prior period. The impact to the Company’s consolidated financial statements as a result of applying ASC 606 was immaterial. Deferred revenue resulting from contracts with customers is included in accrued expenses on the Company’s consolidated balance sheet.

Revenue Recognition

Revenue is recognized when, or as, obligations under the terms of a contract are satisfied, which occurs when control of the promised products or services is transferred to customers. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products or services to a customer (“transaction price”). To the extent the transaction price includes variable consideration, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing the expected value method or the most likely amount method, depending on the facts and circumstances relative to the contract. Variable consideration is included in the transaction price if, in the Company’s judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of the Company’s anticipated performance and all information (historical, current and forecasted) that is reasonably available. Sales, value add, and other taxes collected on behalf of third parties are excluded from revenue.

When determining the transaction price of a contract, an adjustment is made if payment from a customer occurs either significantly before or significantly after performance, resulting in a significant financing component. Applying the practical expedient in paragraph 606-10-32-18, the Company does not assess whether a significant financing component exists if the period between when the Company performs its obligations under the contract and when the customer pays is one year or less. None of the Company’s contracts contained a significant financing component as of September 30, 2018.

Contracts with customers may contain multiple performance obligations. For such arrangements, the transaction price is allocated to each performance obligation based on the estimated relative standalone selling prices of the promised products or services underlying each performance obligation. The Company determines standalone selling prices based on the price at which the performance obligation is sold separately. If the standalone selling price is not observable through past transactions, the Company estimates the standalone selling price taking into account available information such as market conditions and internally approved pricing guidelines related to the performance obligations.

The Company recognizes product revenue under the terms of each customer agreement upon transfer of control to the customer, which occurs at a point in time.

Disaggregation of Revenue

Revenues for the three- and nine-month periods ended September 30, 2018 and 2017 were as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,												Nine Months Ended September 30,
	2018		2017		$ Change			% Change			2018		2017		$ Change			% Change
Product revenue	$	49,500	$	36,514	$	12,986			35.6	%	$	142,042	$	99,516	$	42,526			42.7	%
Royalty and other revenue		29		66		(37	)		(56.1	%)		48		108		(60	)		(55.6	%)
Total revenues	$	49,529	$	36,580	$	12,949			35.4	%	$	142,090	$	99,624	$	42,466			42.6	%

When disaggregating revenue, the Company considered all of the economic factors that may affect its revenues. Because all of its revenues are from bioprocessing customers, there are no differences in the nature, timing and uncertainty of the Company’s revenues and cash flows from any of its product lines. However, given that the Company’s revenues are generated in different geographic regions, factors such as regulatory and geopolitical factors within those regions could impact the nature, timing and uncertainty of the Company’s revenues and cash flows. In addition, a significant portion of the Company’s revenues are generated from two customers; therefore, economic factors specific to these two customers could impact the nature, timing and uncertainty of the Company’s revenues and cash flows.

The following tables disaggregate the Company’s revenue from contracts with customers by geographic region (amounts in thousands).

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	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
North America	$	24,064	$	16,428	$	66,575	$	40,203
Europe		19,328		16,374		58,497		49,322
Asia and Australia		6,075		3,630		16,731		9,949
Other		62		148		287		150
Total	$	49,529	$	36,580	$	142,090	$	99,624

Revenue from significant customers is as follows (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
MilliporeSigma	$	8,791	$	5,191	$	24,181	$	17,727
GE Healthcare	$	7,743	$	6,254	$	22,253	$	24,285

Protein Products

The Company’s protein product line generates revenue through the sale of Protein A ligands and growth factors. Protein A ligands are an essential component of Protein A chromatography resins (media) used in the purification of virtually all mAb-based drugs on the market or in development. The Company manufactures multiple forms of Protein A ligands under long-term supply agreements with major life sciences companies, who in turn sell their Protein A chromatography media to end users (biopharmaceutical manufacturers). The Company also manufactures growth factors for sale under long-term supply agreements with certain life sciences companies as well as direct sales to its customers. Each protein product is considered distinct and therefore represents a separate performance obligation. Protein product revenue is generally recognized at a point in time upon transfer of control to the customer.

Filtration Products

The Company’s filtration product line generates revenue through the sale of KrosFlo^® hollow fiber (“HF”) TFF membranes and modules, ProConnex^® single-use flow path connectors, flat sheet TFF cassettes and hardware, and XCell™ alternating tangential flow (“ATF”) devices and related consumables.

The Company markets the KrosFlo line of HF cartridges and TFF systems and the ProConnex line of single-use flow path connectors which were acquired as part of the acquisition of Spectrum in August 2017. These products are used in the filtration, isolation, purification and concentration of biologics and diagnostic products. Sales of large-scale systems generally include components and consumables as well as training and installation services at the request of the customer. Because the initial sale of components and consumables are necessary for the operation of the system, such items are combined with the systems as a single performance obligation. Training and installation services do not significantly modify or customize these systems and therefore represent a distinct performance obligation.

The Company’s other filtration product offerings are not highly interdependent of one another and are therefore considered distinct products that represent separate performance obligations. Revenue on these products is generally recognized at a point in time upon transfer of control to the customer. The Company invoices the customer for the installation and training services in an amount that directly corresponds with the value to the customer of the Company’s performance to date; therefore, revenue recognized is based on the amount billable to the customer in accordance with the practical expedient under ASC 606-10-55-18.

The Company also markets flat sheet TFF cassettes and hardware. TFF is a rapid and efficient method for separation and purification of biomolecules that is widely used in laboratory, process development and process scale applications in biopharmaceutical manufacturing. The Company’s single-use Sius™ TFF cassettes and hardware are not highly interdependent of one another and are therefore considered distinct products that represent separate performance obligations. Sius TFF product revenue is generally recognized at a point in time upon transfer of control to the customer.

The Company also markets the XCell™ ATF System, a technologically advanced filtration device used in upstream processes to continuously remove cellular metabolic waste products during the course of a fermentation run, freeing healthy cells to continue producing the biologic drug of interest. ATF Systems typically include a filtration system and consumables (i.e., tube devices, metal stands) as well as training and installation services at the request of the customer. The filtration system and consumables are considered distinct products and therefore represent separate performance obligations. First time purchasers of the systems typically purchase a controller that is shipped with the tube device(s)

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and metal stand(s). The controller is not considered distinct as it is a proprietary product that is highly interdependent with the filtration system; therefore, the controller is combined with the filtration system and accounted for as a single performance obligation. The training and installation services do not significantly modify or customize the ATF system and therefore represent a distinct performance obligation. ATF system product revenue related to the filtration system (including the controller if applicable) and consumables is generally recognized at a point in time upon transfer of control to the customer. ATF system service revenue related to training and installation services is generally recognized over time, as the customer simultaneously receives and consumes the benefits as the Company performs. The Company invoices the customer for the installation and training services in an amount that directly corresponds with the value to the customer of the Company’s performance to date; therefore, revenue recognized is based on the amount billable to the customer in accordance with the practical expedient under ASC 606-10-55-18.

Chromatography Products

The Company’s chromatography product line includes a number of products used in the downstream purification and quality control of biological drugs. The majority of chromatography revenue relates to the OPUS pre-packed chromatography column line and Protein A chromatography resins. OPUS columns typically consist of the outer hardware of the column with a resin as ordered by the customer packed inside of the column. OPUS columns may also be ordered without the packed resin. In either scenario, the OPUS column and resin are not interdependent of one another and are therefore considered distinct products that represent separate performance obligations. Chromatography product revenue is generally recognized at a point in time upon transfer of control to the customer.

Other Products

The Company’s other products include ELISA test kits used by quality control departments to detect and measure the presence of leached Protein A and/or growth factor in the final product. Each ELISA kit is considered distinct and therefore represents a separate performance obligation. Other product revenue is generally recognized at a point in time upon transfer of control to the customer.

Transaction Price Allocated to Future Performance Obligations

Remaining performance obligations represents the transaction price of contracts for which work has not been performed or has been partially performed. The Company’s future performance obligations relate primarily to the installation and training of certain of its systems sold to customers. These performance obligations are completed within one year of receipt of a purchase order from its customers. Accordingly, the Company has elected to not disclose the value of these unsatisfied performance obligations as provided under ASC 606-10-50-14.

Contract Balances from Contracts with Customers

The following table provides information about receivables and deferred revenue from contracts with customers as of September 30, 2018 (amounts in thousands):

	2018
Balances from contracts with customers only:
Accounts receivable	$	30,784
Deferred revenue		1,234
Revenue recognized in the three-month period relating to:
The beginning deferred revenue balance	$	441
Changes in pricing related to products or services satisfied in previous periods		—

The timing of revenue recognition, billings and cash collections results in the accounts receivables and deferred revenue balances on the Company’s consolidated balance sheets. There were no impairment losses on receivables during the three- and nine-month periods ending September 30, 2018.

A contract asset is created when the Company satisfies a performance obligation by transferring a promised good to the customer. Contract assets may represent conditional or unconditional rights to consideration. The right is conditional, and recorded as a contract asset, if the Company must first satisfy another performance obligation in the contract before it is entitled to payment from the customer. Contract assets are transferred to billed receivables once the right becomes unconditional. If the Company has the unconditional right to receive consideration from the customer, the contract asset is accounted for as a billed receivable and presented separately from other contract assets. A right is unconditional if nothing other than the passage of time is required before payment of that consideration is due.

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When consideration is received, or such consideration is unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract, a contract liability is recorded. Contract liabilities are recognized as revenue after control of the products or services is transferred to the customer and all revenue recognition criteria have been met.

Costs to Obtain or Fulfill a Customer Contract

The Company’s sales commission structure is based on achieving revenue targets. The commissions are driven by revenue derived from customer purchase orders which are short term in nature.

Applying the practical expedient in paragraph 340-40-25-4, the Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. These costs are included in selling, general, and administrative expenses. When shipping and handling costs are incurred after a customer obtains control of the products, the Company accounts for these as costs to fulfill the promise and not as a separate performance obligation.

4. Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income by component (amounts in thousands):

	Foreign Currency Translation Gain/ (Loss)
Balance at December 31, 2017	$	(6,363	)
Foreign currency translation loss	$	(5,410	)
Balance at September 30, 2018	$	(11,773	)

5. Earnings Per Share

The Company reports earnings per share in accordance with ASC Topic 260, “Earnings Per Share,” which establishes standards for computing and presenting earnings per share. Basic earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares and dilutive common share equivalents then outstanding. Potential common share equivalents consist of restricted stock awards and the incremental common shares issuable upon the exercise of stock options. Under the treasury stock method, unexercised “in-the-money” stock options and warrants are assumed to be exercised at the beginning of the period or at issuance, if later. The assumed proceeds are then used to purchase common shares at the average market price during the period. Share-based payment awards that entitle their holders to receive non-forfeitable dividends before vesting are considered participating securities and are considered in the calculation of basic and diluted earnings per share. There were no such participating securities outstanding during the three- and nine-month periods ended September 30, 2018 and 2017.

Basic and diluted weighted average shares outstanding were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Weighted average common shares		43,822,472		41,236,554		43,728,503		36,435,591
Dilutive common stock options and restricted stock units		651,265		484,242		511,433		454,340
Dilutive effect of convertible senior notes		1,354,438		842,206		892,179		496,402
Weighted average common shares, assuming dilution		45,828,175		42,563,002		45,132,115		37,386,333

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At September 30, 2018, there were outstanding options to purchase 1,033,312 shares of the Company’s common stock at a weighted average exercise price of $26.99 per share and 707,716 restricted stock units. For the three- and nine-month periods ended September 30, 2018, 329,409 and 485,520 options to purchase shares of the Company’s common stock, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of the stock options were greater than or equal to the average price of the common shares and were therefore anti-dilutive.

At September 30, 2017, there were outstanding options to purchase 749,669 shares of the Company’s common stock at a weighted average exercise price of $20.84 per share and 515,468 restricted stock units. For the three- and nine-month periods ended September 30, 2017, 162,544 and 326,572 options to purchase shares of the Company’s common stock, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of the stock options were greater than or equal to the average price of the common shares and were therefore anti-dilutive.

As provided by the terms of the indenture underlying the Company’s 2.125% Convertible Senior Notes due 2021 (the “Notes”), the Company has a choice to settle the conversion obligation for the Notes in cash, shares or any combination of the two. The Company currently intends to settle the par value of the Notes in cash and any excess conversion premium in shares. The Company applies the provisions of ASC 260, “Earnings Per Share,” subsection 10-45-44, to determine the diluted weighted average shares outstanding as it relates to the conversion spread on the Notes. Accordingly, the par value of the Notes will not be included in the calculation of diluted income per share, but the dilutive effect of the conversion premium will be considered in the calculation of diluted net income per share using the treasury stock method. The dilutive impact of the Notes is based on the difference between the Company’s current period average stock price and the conversion price of the Notes, provided there is a premium. Pursuant to this accounting standard, there is no dilution from the accreted principal of the Notes as of September 30, 2018 and September 30, 2017.

6. Inventories

Inventories relate to the Company’s bioprocessing business. The Company values inventory at cost or, if lower, market value, using the first-in, first-out method. The Company reviews its inventories at least quarterly and records a provision for excess and obsolete inventory based on its estimates of expected sales volume, production capacity and expiration dates of raw materials, work-in-process and finished products. Expected sales volumes are determined based on supply forecasts provided by key customers for the next 3 to 12 months. The Company writes down inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value, and inventory in excess of expected requirements to cost of product revenue. Manufacturing of bioprocessing finished goods is done to order and tested for quality specifications prior to shipment.

A change in the estimated timing or amount of demand for the Company’s products could result in additional provisions for excess inventory quantities on hand. Any significant unanticipated changes in demand or unexpected quality failures could have a significant impact on the value of inventory and reported operating results. During all periods presented in the accompanying financial statements, there have been no material adjustments related to a revised estimate of inventory valuations.

Work-in-process and finished products inventories consist of material, labor, outside processing costs and manufacturing overhead. Inventories consist of the following (amounts in thousands):

	September 30, 2018		December 31, 2017
Raw Materials	$	24,349	$	21,678
Work-in-process		6,278		4,756
Finished products		11,657		12,570
Total	$	42,284	$	39,004

7. Property, Plant and Equipment

Property, plant and equipment consist of the following (amounts in thousands):

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	September 30, 2018			December 31, 2017
Land	$	1,023		$	1,023
Buildings		764			764
Leasehold improvements		15,940			15,673
Equipment		23,405			21,904
Furniture and fixtures		5,156			4,272
Construction in progress		10,086			2,581
Total property, plant and equipment		56,374			46,217
Less: accumulated depreciation		(27,015	)		(23,800	)
Property, plant and equipment, net	$	29,359		$	22,417

Depreciation expense totaled approximately $3,871,000 and $2,988,000 for the nine-month periods ended September 30, 2018 and 2017, respectively.

8. Intangible Assets

Intangible assets are amortized over their useful lives using the straight-line method, as applicable, and the amortization expense is recorded within selling, general and administrative expense in the Company’s condensed consolidated statements of comprehensive income.

The Company reviews its indefinite-lived intangible assets not subject to amortization to determine if adverse conditions exist or a change in circumstances exists that would indicate an impairment. Intangible assets and their related useful lives are reviewed at least annually to determine if any adverse conditions exist that would indicate the carrying value of these assets may not be recoverable. More frequent impairment assessments are conducted if certain conditions exist, including a change in the competitive landscape, any internal decisions to pursue new or different technology strategies, a loss of a significant customer, or a significant change in the marketplace, including changes in the prices paid for our products or changes in the size of the market for our products. An impairment results if the carrying value of the asset exceeds the estimated fair value of the asset. If the estimate of an intangible asset’s remaining useful life is changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company continues to believe that its intangible assets are recoverable at September 30, 2018.

Intangible assets consisted of the following at September 30, 2018 (amounts in thousands):

	Gross Carrying Amount		Accumulated Amortization			Weighted Average Useful Life (in years)
Technology – developed	$	51,689	$	(5,221	)		19
Patents		240		(240	)		8
Customer relationships		101,563		(14,821	)		14
Trademark – definite lived		2,160		(131	)		20
Trademark – indefinite lived		700		—			—
Other intangibles		1,061		(466	)		3
Total intangible assets	$	157,413	$	(20,879	)		16

Intangible assets consisted of the following at December 31, 2017 (amounts in thousands):

	Gross Carrying Amount		Accumulated Amortization			Weighted Average Useful Life (in years)
Technology – developed	$	51,801	$	(3,201	)		19
Patents		240		(238	)		8
Customer relationships		102,120		(9,636	)		14
Trademarks – definite lived		2,160		(47	)		20
Trademarks – indefinite lived		700		—			—
Other intangibles		1,063		(209	)		3
Total intangible assets	$	158,084	$	(13,331	)		16

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Amortization expense for amortized intangible assets was approximately $7,906,000 and $3,476,000 for the nine-month periods ended September 30, 2018 and 2017, respectively. As of September 30, 2018, the Company expects to record amortization expense as follows (amounts in thousands):

Years Ending	Amortization Expense
December 31, 2018 (three months remaining)	$	2,636
December 31, 2019		10,433
December 31, 2020		9,854
December 31, 2021		9,363
December 31, 2022		9,361

9. Accrued Liabilities

Accrued liabilities consist of the following (amounts in thousands):

	September 30, 2018		December 31, 2017
Employee compensation	$	7,986	$	9,560
Taxes		2,719		1,668
Related party payable		1,728		—
Royalty and license fees		1,065		1,383
Accrued purchases		261		1,191
Warranties		605		598
Professional fees		563		947
Deferred revenue		1,234		960
Other accrued expenses		1,803		1,622
Total	$	17,964	$	17,929

10. Convertible Senior Notes

The carrying value of the Notes is as follows (amounts in thousands):

	September 30, 2018			December 31, 2017
2.125% Convertible Senior Notes due 2021:
Principal amount	$	114,989		$	115,000
Unamortized debt discount		(10,706	)		(13,395	)
Unamortized debt issuance costs		(1,883	)		(2,355	)
Total Convertible Senior Notes	$	102,400		$	99,250
Less: Current portion		(102,400	)		—
Total Convertible Senior Notes, long-term	$	—		$	99,250

On May 24, 2016, the Company issued $115.0 million aggregate principal amount of its Notes. The net proceeds from the sale of the Notes, after deducting the underwriting discounts and commissions and other related offering expenses, were approximately $111.1 million. The Notes bear interest at the rate of 2.125% per annum, payable semiannually in arrears on June 1 and December 1 of each year, beginning December 1, 2016.

The Notes will mature on June 1, 2021, unless earlier repurchased, redeemed or converted in accordance with their terms. Prior to March 1, 2021, the Notes will be convertible at the option of holders of the Notes only upon satisfaction of certain conditions and during certain periods, and thereafter, the Notes will be convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. Upon conversion, holders of the Notes will receive shares of the Company’s common stock, cash or a combination thereof, at the Company’s election. It is the Company’s current intent and policy to settle all conversions through combination settlement, which involves satisfying the principal amount outstanding with cash and any note conversion value over the principal amount in shares of the Company’s common stock.

Notes with a par value of $11,000 were submitted for conversion in the fourth quarter of 2017, and this conversion was settled in the first quarter of 2018. The conversion resulted in the issuance of a nominal amount of shares of the Company’s common stock, and the Company recorded a loss of $1,000 on the conversion of these Notes.

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During the third quarter of 2018, the closing price of the Company’s common stock exceeded 130% of the conversion price of the Notes for more than 20 trading days of the last 30 consecutive trading days of the quarter. As a result, the Notes are convertible at the option of the holders of the Notes during the fourth quarter of 2018, the quarter immediately following the quarter when the conditions were met, as stated in the terms of the Notes. These terms were also met in the second quarter of 2018 and as a result, the Company reclassified the carrying value of the Notes from long-term liabilities to current liabilities on the Company’s consolidated balance sheet as of June 30, 2018. As of September 30, 2018, the if-converted value of the Notes exceeded the aggregate principal amount by approximately $87.4 million. As of the date of this filing, no Notes were converted by the holders of such Notes in the third quarter of 2018. In the event the closing price conditions are met in the fourth quarter of 2018 or a future fiscal quarter, the Notes will be convertible at a holder’s option during the immediately following fiscal quarter.

The conversion rate for the Notes will initially be 31.1813 shares of the Company’s common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $32.07 per common share, and is subject to adjustment under the terms of the Notes. Holders of the Notes may require the Company to repurchase their Notes upon the occurrence of a fundamental change prior to maturity for cash 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 excluding, the repurchase date.

The Company will not have the right to redeem the Notes prior to June 5, 2019, but may redeem the Notes, at its option, in whole or in part, on any business day on or after June 5, 2019 and prior to the maturity date if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides written notice of redemption. The redemption price will be equal to 100% of the principal amount of the principal amount of Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.

The Notes contain customary terms and events of default. If an event of default (other than certain events of bankruptcy, insolvency or reorganization involving the Company) occurs and is continuing, the holders of at least 25% in aggregate principal amount of the outstanding Notes may declare 100% of the principal of, and any accrued and unpaid interest on, all of the Notes to be due and payable. Upon the occurrence of certain events of bankruptcy, insolvency or reorganization involving the Company, 100% of the principal of and accrued and unpaid interest, if any, on all of the Notes will become due and payable automatically. Notwithstanding the foregoing, the Notes provide that, to the extent the Company elects and for up to 270 days, the sole remedy for an event of default relating to certain failures by the Company to comply with certain reporting covenants consist exclusively of the right to receive additional interest on the Notes. The Company is not aware of any events of default, current events or market conditions that would allow holders to call or convert the Notes as of September 30, 2018.

The cash conversion feature of the Notes required bifurcation from the Notes and was initially accounted for as an equity instrument classified to stockholders’ equity, as the conversion feature was determined to be clearly and closely related to the Company’s stock. Based on market data available for publicly traded, senior, unsecured corporate bonds issued by companies in the same industry and asset base and with similar maturity, the Company estimated the implied interest rate, assuming no conversion option. Assumptions used in the estimate represent what market participants would use in pricing the liability component, including market interest rates, credit standing, and yield curves, all of which are defined as Level 2 observable inputs. The estimated implied interest rate was applied to the Notes, which resulted in a fair value of the liability component of $96,289,000 upon issuance, calculated as the present value of implied future payments based on the $115 million aggregate principal amount. The equity component of the Notes was recognized as a debt discount, recorded in additional paid-in capital, and represents the difference between the aggregate principal of the Notes and the fair value of the Notes without conversion option on their issuance date. The debt discount is amortized to interest expense using the effective interest method over five years, or the life of the Notes. The Company assesses the equity classification of the cash conversion feature quarterly, and it is not re-measured as long as it continues to meet the conditions for equity classification.

Interest expense recognized on the Notes during the three-month period ended September 30, 2018 includes $611,000, $911,000 and $160,000 for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. Interest expense recognized on the Notes during the nine-month period ended September 30, 2018 includes $1,833,000, $2,687,000 and $473,000 for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. The effective interest rate on the Notes is 6.6%, which includes the interest on the Notes, amortization of the debt discount and debt issuance costs. As of September 30, 2018, the carrying value of the Notes was approximately $102.4 million and the fair value of the principal was approximately $202.4 million. The fair value of the Notes was determined based on the most recent trade activity of the Notes as of September 30, 2018.

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11. Stock-Based Compensation

For the three-month periods ended September 30, 2018 and 2017, the Company recorded stock-based compensation expense of approximately $2,779,000 and $1,817,000, respectively, for share-based awards granted under the Second Amended and Restated 2001 Repligen Corporation Stock Plan (the “2001 Plan”), the Repligen Corporation Amended and Restated 2012 Stock Option and Incentive Plan (the “2012 Plan,”), and the Repligen Corporation 2018 Stock Option and Incentive Plan (the “2018 Plan,” and together with the 2001 Plan and the 2012 Plan, the “Plans”). The Company recorded stock-based compensation expense of approximately $7,672,000 and $4,845,000 for the nine-month periods ended September 30, 2018 and 2017, respectively, for share-based awards granted under the Plans.

The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of product revenue	$	277	$	197	$	777	$	491
Research and development		253		127		650		338
Selling, general and administrative		2,249		1,493		6,245		4,016
Total	$	2,779	$	1,817	$	7,672	$	4,845

The 2018 Plan allows for the granting of incentive and nonqualified options to purchase shares of common stock, restricted stock units (“RSUs”) and other equity awards. Employee grants under the Plans generally vest over a three- to five-year period, with 20%-33% vesting on the first anniversary of the date of grant and the remainder vesting in equal yearly installments thereafter. Nonqualified options and RSUs issued to non-employee directors under the Plans generally vest over one year. In the first quarter of 2018, to create a longer-term retention incentive, the Company’s Compensation Committee granted long-term incentive compensation awards to its Chief Executive Officer consisting of both stock options and RSUs that are subject to time-based vesting over nine years. Options granted under the Plans have a maximum term of ten years from the date of grant and generally, the exercise price of the stock options equals the fair market value of the Company’s common stock on the date of grant. At September 30, 2018, options to purchase 1,033,312 shares and 707,716 RSUs were outstanding under the Plans. At September 30, 2018, 2,906,351 shares were available for future grant under the 2018 Plan.

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards on the grant date, and the Company uses the value of the common stock as of the grant date to value RSUs. The Company measures stock-based compensation cost at the grant date based on the estimated fair value of the award. The Company recognizes expense on awards with service based vesting over the employee’s requisite service period on a straight-line basis. In the third quarter of 2017, the Company issued performance stock units to certain employees related to the Spectrum Acquisition which are tied to the achievement of certain revenue and gross margin metrics and the passage of time. Additionally, in the first quarter of 2018, the Company issued performance stock units to certain individuals which are tied to the achievement of certain 2018 revenue metrics and the passage of time. The Company recognizes expense on performance based awards over the vesting period based on the probability that the performance metrics will be achieved. The Company recognizes stock-based compensation expense for options that are ultimately expected to vest, and accordingly, such compensation expense has been adjusted for estimated forfeitures.

Information regarding option activity for the nine-month period ended September 30, 2018 under the Plans is summarized below:

	Options Outstanding			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Options outstanding at December 31, 2017		734,940		$	20.80
Granted		439,678			34.79
Exercised		(131,718	)		18.02
Forfeited/cancelled		(9,588	)		29.71
Options outstanding at September 30, 2018		1,033,312		$	26.99		7.38	$	29,421
Options exercisable at September 30, 2018		444,446		$	18.73		5.29	$	16,325

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	Options Outstanding		Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Vested and expected to vest at September 30, 2018 (1)		986,509	$	26.64		7.29	$	28,429

(1) Represents the number of vested options as of September 30, 2018 plus the number of unvested options expected to vest as of September 30, 2018 based on the unvested outstanding options at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the closing price of the common stock on September 28, 2018, the last trading day of the nine-month period ended September 30, 2018, of $55.46 per share and the exercise price of each in-the-money option) that would have been received by the option holders had all option holders exercised their options on September 30, 2018.

The weighted average grant date fair value of options granted during the nine-month periods ended September 30, 2018 and 2017 was $18.56 and $16.94, respectively. The total fair value of stock options that vested during the nine-month periods ended September 30, 2018 and 2017 was approximately $2,113,000 and $2,074,000, respectively.

Information regarding RSU and performance stock unit activity for the nine-month period ended September 30, 2018 under the Plans is summarized below:

	Units Outstanding			Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Restricted and performance stock units outstanding at December 31, 2017		505,235
Granted		385,461
Vested		(134,590	)
Forfeited/cancelled		(48,390	)
Restricted stock units outstanding at September 30, 2018		707,716			3.94	$	39,250
Vested and expected to vest at September 30, 2018 (1)		649,985			3.43	$	36,048

(1) Represents the number of unvested RSUs expected to vest as of September 30, 2018 based on the unvested outstanding RSUs at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (equal to the closing price of the common stock on September 28, 2018, the last trading day of the nine-month period ended September 30, 2018, of $55.46 per share) that would have been received by the RSU holders had all RSUs vested on September 28, 2018. The aggregate intrinsic value of RSUs vested during the nine-month periods ended September 30, 2018 and 2017 was approximately $5,165,000 and $3,480,000, respectively.

The weighted average grant date fair value of RSUs granted during the nine-month periods ended September 30, 2018 and 2017 was $35.13 and $36.85, respectively. The total grant date fair value of RSUs that vested during the nine-month periods ended September 30, 2018 and 2017 was approximately $4,065,000 and $2,565,000, respectively.

As of September 30, 2018, there was $28,360,000 of total unrecognized compensation cost related to unvested share-based awards. This cost is expected to be recognized over a weighted average remaining requisite service period of 4.51 years.

12. Income Taxes

The Company’s effective tax rate for the three- and nine-month periods ended September 30, 2018 was 27.6% and 24.6%, respectively, compared to 330.9% and (183.8%), respectively, for the corresponding periods in the prior year. The effective tax rate for the three- and nine-month periods ended September 30, 2018 was higher than the U.S. statutory rate of 21% due to state tax effects and the impact of the Global Intangible Low-Taxed Income (“GILTI”) tax enacted as part of the Act enacted in December 2017. For the three- and nine-month periods ended September 30, 2017, the

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effective tax rate was lower than the U.S. statutory tax rate of 34% primarily due to the sale of intellectual property from Repligen Corporation to Repligen Sweden AB. The Company utilized certain of its U.S. deferred tax assets as a result of this sale and reduced its valuation allowance on these deferred tax assets by approximately $9,200,000 in the second quarter of 2017. The Company recorded a tax benefit of $5,625,000 on the Company’s consolidated statements of comprehensive income as a result of the sale of the intellectual property.

ASU 2016-16,“Intra-Entity Transfers of Assets Other Than Inventory,” requires the income tax consequences of intra-entity transfers of assets other than inventory to be recognized when the intra-entity transfer occurs rather than deferring recognition of income tax consequences until the transfer was made with an outside party. The Company adopted the provisions of this ASU in the first quarter of 2018. The adoption resulted in a decrease of $5,609,000 to other assets, a decrease of $4,932,000 to deferred tax liabilities and a decrease of $677,000 to accumulated deficit at January 1, 2018.

At December 31, 2017, the Company had net operating loss carryforwards of approximately $19,652,000 in the U.S., net operating loss carryforwards of approximately €603,000 (approximately $743,000) in Germany, federal business tax credit carryforwards of $297,000 and state business tax credit carryforwards of approximately $99,000 available to reduce future domestic income taxes, if any. The net operating loss and business tax credits carryforwards will continue to expire at various dates through December 2037. The net operating loss and business tax credit carryforwards are subject to review and possible adjustment by the Internal Revenue Service. While an IRC Section 382 study was completed in the second quarter of 2017, and no current limitations were identified, use of these net operating loss and business tax credit carryforwards may be limited in the future based on certain changes in the ownership interest of significant stockholders.

On December 22, 2017, the Act was signed into law. The Act made significant changes to federal tax law, including, but not limited to, a reduction in the federal income tax rate from 35% to 21%, taxation of certain global intangible low-taxed income, allowing for immediate expensing of qualified assets, stricter limits on deductions for interest and certain executive compensation, and a one-time transition tax on previously deferred earnings of certain foreign subsidiaries. Due to the complexities involved in accounting for the enactment of the Act, the SEC issued Staff Accounting Bulletin No. (“SAB”) 118, which allows a registrant to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Under the SAB 118 guidance, the Company has determined that although its accounting for the effect of certain provisions of the Act is incomplete, it is able to make reasonable estimates for certain effects of tax reform and therefore have recorded provisional amounts.

The Act lowered the Company’s U.S. statutory federal tax rate from 35% to 21% effective January 1, 2018. The Company recorded a tax benefit of $12,812,000 in the year ended December 31, 2017 for the reduction in its US deferred tax assets and liabilities resulting from the rate change.

The Company is subject to a territorial tax system under the Act, in which the Company is required to provide for tax on GILTI earned by certain foreign subsidiaries. Additionally, the Company is required to make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense. As of September 30, 2018, the Company is still evaluating the effects of the GILTI provisions as guidance and interpretations continue to emerge. Therefore, the Company has not determined its accounting policy on the GILTI provisions. However, the standard requires that the Company reflects the impact of the GILTI provisions as a period expense until the accounting policy is finalized. Therefore, the Company has included the provisional estimate of GILTI related to current-year operations in its estimated annual effective tax rate only and will be updating the impact and accounting policy as the analysis related to the GILTI provisions is completed.

The Act also includes a one-time deemed repatriation transition tax whereby entities that are shareholders of a specified foreign corporation must include in gross income the undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation. The provisional amount recorded at December 31, 2017 increased the Company’s tax provision by $3,266,000. This amount may change as the Company refines its calculations of post-1986 earnings and profits for our foreign subsidiaries, as well as the amounts held in cash.

The Company anticipates that future guidance and interpretations with respect to the Act will cause the Company to further adjust its provisional amounts recorded as of December 31, 2017. No further adjustments have been made to these provisional amounts in 2018. Any measurement period adjustments will be reported as a component of provision for income taxes in the reporting period the amounts are determined. The final accounting will be completed no later than one year from the enactment of the Act.

The Company’s tax returns are subject to examination by federal, state and international tax authorities for the following periods:

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Jurisdiction	Fiscal Years Subject to Examination
United States – federal and state	2015-2017
Sweden	2011-2017
Germany	2017
Netherlands	2012-2017

13. Fair Value Measurement

In determining the fair value of its assets and liabilities, the Company uses various valuation approaches. The Company employs a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The fair value hierarchy is broken down into three levels based on the source of inputs as follows:

Level 1  –	Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access
Level 2  –	Valuations based on quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and models for which all significant inputs are observable, either directly or indirectly
Level 3  –	Valuations based on inputs that are unobservable and significant to the overall fair value measurement

The availability of observable inputs can vary among the various types of financial assets and liabilities. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for financial statement disclosure purposes, the level in the fair value hierarchy within which the fair value measurement is categorized is based on the lowest level input that is significant to the overall fair value measurement.

The Company’s fixed income investments have historically comprised of obligations of U.S. government agencies and corporate marketable securities. These investments have been initially valued at the transaction price and subsequently valued, at the end of each reporting period, utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation models, including both income and market based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. At least annually, the Company validates applicable prices provided by third party pricing services by reviewing their pricing methods and matrices, obtaining market values from other pricing sources, analyzing pricing data in certain instances and confirming that the relevant markets are active.

As of September 30, 2018 and December 31, 2017, the Company had no assets or liabilities for which fair value measurement is either required or has been elected to be applied.

In May 2016, the Company issued $115.0 million aggregate principal amount of the Notes due June 1, 2021. Interest is payable semi-annually in arrears on June 1 and December 1 of each year, beginning December 1, 2016. As of September 30, 2018, the carrying value of the Notes was approximately $102.4 million, net of unamortized discount, and the fair value of the Notes was approximately $202.4 million. The fair value of the Notes was determined based on the most recent trade activity of the Notes as of September 30, 2018. These valuations are Level 1 valuations, as the valuations are based on unadjusted quoted prices in active markets that the Company has the ability to access. The Notes are discussed in more detail in Note 10, “Convertible Senior Notes.”

There were no re-measurements to fair value during the nine-month period ended September 30, 2018 of financial assets and liabilities that are not measured at fair value on a recurring basis.

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14. Commitments and Contingencies

The Company leases its headquarters in Waltham, Massachusetts as well as certain of its office and manufacturing space around the world.

In February 2018, the Company entered into an agreement to lease 63,761 square feet of office and manufacturing space in Marlborough, Massachusetts from U.S. REIF 111 Locke Drive Massachusetts, LLC (the “Premises”).

The term of the lease commenced on June 1, 2018 (the “Commencement Date”) and shall continue for a period of 126 consecutive months, unless earlier terminated in accordance with the terms of the lease (the “Lease Term”). Under the lease, the Company has the option to extend the Lease Term for two additional five-year periods.

Fixed rent with respect to 40,000 square feet of the Premises commenced on the Commencement Date, and rent for the full 63,761 square feet of the Premises shall begin 19 months following the Commencement Date. Under the terms of the lease, the Company has provided a letter of credit of approximately $163,000 as a security deposit and is required to pay its pro rata share of any building operating expenses and real estate taxes.

Future minimum rental commitments under the Company’s leases as of September 30, 2018 are as follows (amounts in thousands):

	Minimum Rental Commitments
2018 (three months remaining)	$	893
2019		3,425
2020		3,266
2021		2,957
2022		2,049
Thereafter		4,872

15. Related Party Transactions

Certain facilities leased by Spectrum are owned by the former owner of Spectrum, who currently holds greater than 10% of the Company’s outstanding common stock. The lease amounts paid to this shareholder were negotiated in connection with the Spectrum Acquisition. The Company has incurred rent expense totaling $555,000 for the nine-month period ended September 30, 2018 related to these leases.

As part of the Spectrum Acquisition, the Company is responsible for filing all tax returns for Spectrum for the period from January 1, 2017 through July 31, 2017, the day before the Spectrum Acquisition. The Company is responsible for collecting any tax refunds from federal and state authorities and remitting these refunds to the former shareholders of Spectrum, including the former owner of Spectrum who currently holds greater than 10% of the Company’s outstanding common stock. As of September 30, 2018, the Company has accrued $1,728,000 of these refunds payable to the Spectrum shareholders, net of $207,000 of expenses paid by the Company on behalf of Spectrum for tax preparation and other fees. These amounts are included in accrued liabilities on the Company’s consolidated balance sheet.

16. Segment Reporting

The Company views its operations, makes decisions regarding how to allocate resources and manages its business as one operating segment. As a result, the financial information disclosed herein represents all of the material financial information related to the Company’s sole operating segment.

The following table represents the Company’s total revenue by geographic area (based on the location of the customer):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
North America		49	%		45	%		47	%		40	%
Europe		39	%		45	%		41	%		50	%
Asia and Australia		12	%		10	%		12	%		10	%
Other		0	%		0	%		0	%		0	%
Total		100	%		100	%		100	%		100	%

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Revenue from significant customers as a percentage of the Company’s total revenue is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
MilliporeSigma		18	%		14	%		17	%		18	%
GE Healthcare		16	%		17	%		16	%		24	%

Significant accounts receivable balances as a percentage of the Company’s total trade accounts receivable are as follows:

	September 30, 2018			December 31, 2017
GE Healthcare		21	%		11	%
MilliporeSigma		14	%		19	%

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

Overview

Repligen and its subsidiaries, collectively doing business as Repligen Corporation (“Repligen”, “we”, “our”, or “the Company”) is a leading provider of advanced bioprocessing technology and solutions used in the process of manufacturing biologic drugs. Our products are made to substantially increase biopharmaceutical manufacturing efficiencies and flexibility. As the global biologics market continues to experience strong growth and expansion, our customers – primarily large biopharmaceutical companies and contract manufacturing organizations – face critical production cost, capacity, quality and time pressures that our products are made to address. Our commitment to bioprocessing is helping to set new standards for the way our customers manufacture biologic drugs – monoclonal antibodies, recombinant proteins, vaccines and gene therapies. We are dedicated to inspiring advances in bioprocessing as a trusted partner in the production of biologic drugs that improve human health worldwide.

Prior to 2012, the Company was focused on drug development, with clinical trial costs supported by bioprocessing product sales. At that time our bioprocessing business was largely represented by sales of Protein A ligands, which we sell through long-term original equipment manufacturer (“OEM”) supply agreements. Our 2011 acquisition of Novozymes Biopharma Sweden AB further expanded our proteins product portfolio and provided the impetus to set a new direction for the company. By mid-2012, we permanently discontinued and have since divested all drug development programs. We retained our proteins OEM business and, through internal innovation and strategic acquisitions, we have built chromatography and filtration product offerings that we sell directly to biologics manufacturers. We continue to seek out strategic opportunities to strengthen and expand our bioprocessing business.

We currently operate as one bioprocessing business, with a comprehensive suite of products to serve both upstream and downstream processes in biologic drug manufacturing. Building on over 35 years of industry expertise, we have developed a broad and diversified product portfolio that reflects our commitment to build a best-in-class bioprocessing technology company with a world-class direct sales and commercial organization.

Our Protein products are represented by our Protein A affinity ligands and cell culture growth factor products. In addition to long-standing OEM supply agreements with GE Healthcare, MilliporeSigma and Purolite Life Sciences for these products, in June 2018 we secured an agreement with Navigo Proteins GmbH for the exclusive co-development of multiple affinity ligands for which Repligen holds commercialization rights. We are manufacturing and have agreed to supply the first of these ligands, NGL-Impact™ A, exclusively to Purolite Life Sciences, who will pair our high-performance ligand with their agarose jetting base bead technology used in Purolite’s Jetted A50 Protein A resin.

Our direct-to customer Chromatography product line includes a number of products used in the downstream purification and quality control of biological drugs, including a broad range of OPUS^® pre-packed chromatography columns, chromatography resins and ELISA test kits.

Our direct-to-customer Filtration product line includes our XCell™ ATF system for use in upstream process intensification, our Sius™ TFF cassettes for use in downstream purification and formulation processes, our KrosFlo^® line of hollow fiber cartridges and TFF systems, and our ProConnex^® single-use tubing sets. With the addition of Spectrum LifeSciences LLC (“Spectrum”) in August 2017 (the “Spectrum Acquisition”), we now in-house manufacture hollow fiber filters that can be used in our XCell^™ ATF systems and have increased our direct sales presence in Europe and Asia. In September 2018, we entered into a collaboration agreement with Sartorius Stedim Biotech (“SSB”) to integrate our XCell^™ ATF cell retention control technology into SSB’s BIOSTAT^® STR large-scale, single-use bioreactors, to create novel perfusion-enabled bioreactors. We continue to expand the applications for our bioprocessing products and to diversify our end markets beyond monoclonal antibodies to include vaccines, recombinant protein and gene therapies.

Critical Accounting Policies and Estimates

A “critical accounting policy” is one which is both important to the portrayal of our financial condition and results and requires management’s most difficult, subjective or complex judgments, often as a result of the need to make estimates about the effect of matters that are inherently uncertain. For a description of our critical accounting policies that affect our more significant judgments and estimates used in the preparation of our consolidated financial statements, refer to Management’s Discussion and Analysis of Financial Condition and Results of Operations and our significant accounting policies in Note 2 to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC.

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Results of Operations

Revenues

Product revenues for the three- and nine-month periods ended September 30, 2018 and 2017 were as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,										2018		Nine Months Ended September 30,
	2018		2017		$ Change			% Change					2017		$ Change			% Change
Product revenue	$	49,500	$	36,514	$	12,986			35.6	%	$	142,042	$	99,516	$	42,526			42.7	%
Royalty and other revenue		29		66		(37	)		(56.1	%)		48		108		(60	)		(55.6	%)
Total revenues	$	49,529	$	36,580	$	12,949			35.4	%	$	142,090	$	99,624	$	42,466			42.6	%

Sales of bioprocessing products increased 35.6% and 42.7% in the three- and nine-month periods ended September 30, 2018, respectively, compared to the corresponding periods in the prior year. This increase was primarily due to continued adoption of our products by our key bioprocessing customers and for the three- and nine-month periods of 2018, the addition of revenues following the Spectrum Acquisition. Sales of our bioprocessing products are impacted by the timing of orders, development efforts at our customers or end-users and regulatory approvals for biologics that incorporate our products, which may result in significant quarterly fluctuations. Such quarterly fluctuations are expected, but they may not be predictive of future revenue or otherwise indicate a trend.

Costs and operating expenses

Total costs and operating expenses for the three- and nine-month periods ended September 30, 2018 and 2017 were comprised of the following (amounts in thousands, except percentages):

	Three Months Ended September 30,									2018		Nine Months Ended September 30,
	2018		2017		$ Change		% Change					2017		$ Change		% Change
Cost of product revenue	$	22,183	$	19,987	$	2,196		11.0	%	$	62,939	$	47,913	$	15,026		31.4	%
Research and development		3,601		2,001		1,600		80.0	%		12,669		5,603		7,066		126.1	%
Selling, general and administrative		15,859		14,998		861		5.7	%		48,347		35,365		12,982		36.7	%
Total costs and operating expenses	$	41,643	$	36,986	$	4,657		12.6	%	$	123,955	$	88,881	$	35,074		39.5	%

Cost of product revenue increased 11.0% and 31.4% in the three- and nine-month periods ended September 30, 2018, respectively, compared to the corresponding periods in the prior year. This increase is primarily due to the increased product revenues noted above. Gross margins may fluctuate in the fourth quarter of 2018 and future quarters based on expected production volume and product mix.

Research and development expenses increased by 80.0% and 126.1% in the three- and nine-month periods ended September 30, 2018, respectively, compared to the corresponding periods in the prior year. This increase is driven by investments made in the second quarter of 2018 to expand our proteins product offerings through our development agreement with Navigo Proteins GmbH. Additionally, the increase is related to product development activities acquired as part of the Spectrum Acquisition and increased activity on our various bioprocessing product development projects.

Selling, general and administrative expenses increased 5.7% and 36.7% in the three- and nine-month periods ended September 30, 2018, respectively, compared to the corresponding periods in the prior year. This increase is due to selling and administrative activities incurred following the Spectrum Acquisition, as well as the continued buildout of our administrative infrastructure to support future growth and continued expansion of our customer-facing activities to drive sales of our bioprocessing products.

Investment income

Investment income for the three- and nine-month periods ended September 30, 2018 and 2017 was as follows (amounts in thousands, except percentages):

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	Three Months Ended September 30,									Nine Months Ended September 30,
	2018		2017		$ Change		% Change			2018		2017		$ Change		% Change
Investment income	$	558	$	102	$	456		447.1	%	$	1,251	$	308	$	943		306.2	%

Investment income includes income earned on invested cash balances. The increase in investment income in the three- and nine-month periods ended September 30, 2018 compared to the corresponding prior year periods is attributable to higher average invested cash balances and higher interest rates on such cash balances.

Interest expense

Interest expense for the three- and nine-month periods ended September 30, 2018 and 2017 was as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,												Nine Months Ended September 30,
	2018			2017			$ Change			% Change			2018			2017			$ Change			% Change
Interest expense	$	(1,687	)	$	(1,618	)	$	(69	)		(4.3	%)	$	(5,008	)	$	(4,804	)	$	(204	)		(4.2	%)

Increases in interest expense in the three- and nine-month periods ended September 30, 2018, respectively, compared to the corresponding periods in the prior year are attributable to interest expense related to the issuance of 2.125% Convertible Senior Notes due 2021 (the “Notes”) in May 2016.

Other (expenses) income

Other (expenses) income for the three- and nine-month periods ended September 30, 2018 and 2017 was as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,												Nine Months Ended September 30,
	2018			2017			$ Change			% Change			2018		2017			$ Change		% Change
Other (expenses) income	$	(134	)	$	(100	)	$	(34	)		(34.0	%)	$	187	$	(548	)	$	735		134.1	%

Changes in other (expenses) income in the three- and nine-month periods ended September 30, 2018, respectively, compared to the corresponding periods in the prior year are primarily attributable to foreign currency gains and losses related to amounts due from non-Swedish kronor-based customers and cash balances denominated in U.S. dollars and British pounds held by Repligen Sweden AB.

Income tax provision (benefit)

Income tax provision (benefit) for the three- and nine-month periods ended September 30, 2018 and 2017 was as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,										Nine Months Ended September 30,
	2018		2017			$ Change		% Change			2018		2017			$ Change		% Change
Income tax provision (benefit)	$	1,829	$	(6,691	)	$	8,520		127.3	%	$	3,586	$	(10,476	)	$	14,062		134.2	%

For the three- and nine-month periods ended September 30, 2018, we had income before taxes of $6,623,000 and $14,565,000, respectively, and recorded a tax provision of $1,829,000 and $3,586,000, respectively. The effective tax rate was 27.6% and 24.6% for the three- and nine-month periods ended September 30, 2018, respectively, and is based upon the estimated income for the year and the composition of the income in different jurisdictions. The effective tax rate for the three- and nine-month periods ended September 30, 2018 was higher than the U.S. statutory rate of 21% due to state tax effects and the impact of the Global Intangible Low-Taxed Income tax enacted as part of the Tax Cuts and Jobs Act (the “Act”) enacted in December 2017.

For the three- and nine-month periods ended September 30, 2017, we had losses before taxes of $(2,022,000) and income before taxes of $5,699,000, respectively, and recorded a tax benefit of ($6,691,000) and ($10,476,000), respectively. The effective tax rate was 330.9% and (183.8%) for the three- and nine-month periods ended September 30, 2017, respectively, and is based upon the estimated income for the year and the composition of the income in different jurisdictions. The effective tax rate was lower than the U.S. statutory tax rate of 34% primarily due to a benefit of approximately $6,611,000 related to the release of the valuation allowance on deferred tax assets held in the United States, resulting from the Spectrum

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Acquisition in the third quarter of 2017 and a benefit of approximately $5,625,000 related to the reduction of the Company’s valuation allowance on its deferred tax assets resulting from the sale of certain intellectual property from Repligen Corporation to Repligen Sweden AB in the second quarter of 2017.

Non-GAAP Financial Measures

We provide non-GAAP adjusted income from operations; adjusted net income; and adjusted EBITDA as supplemental measures to GAAP measures regarding our operating performance. These financial measures exclude the items detailed below and, therefore, have not been calculated in accordance with GAAP. A detailed explanation and a reconciliation of each non-GAAP financial measure to its most comparable GAAP financial measure is provided below.

We include this financial information because we believe these measures provide a more accurate comparison of our financial results between periods and more accurately reflect how management reviews its financial results. We excluded the impact of certain acquisition-related items because we believe that the resulting charges do not accurately reflect the performance of our ongoing operations for the period in which such charges are incurred.

Adjusted Income from Operations

Adjusted income from operations is measured by taking income from operations as reported in accordance with GAAP and excluding acquisition and integration costs, amortization of intangible assets and inventory step-up charges booked through our consolidated statements of comprehensive income. The following is a reconciliation of income from operations in accordance with GAAP to adjusted income from operations for the three- and nine-month periods ended September 30, 2018 and 2017 (amounts in thousands):

	Three Months Ended September 30,					Nine Months Ended September 30,
	2018		2017			2018		2017
GAAP income (loss) from operations	$	7,886	$	(406	)	$	18,135	$	10,743
Adjustments to income from operations:
Acquisition and integration costs		805		3,378			2,313		6,165
Intangible amortization		2,608		1,993			7,906		3,476
Inventory step-up charges		—		2,720			—		2,944
Adjusted income from operations	$	11,299	$	7,685		$	28,354	$	23,328

Adjusted Net Income

Adjusted net income is measured by taking net income as reported in accordance with GAAP and excluding acquisition and integration costs and related tax effects, amortization of intangible assets and related tax effects, inventory step-up charges and non-cash interest expense booked through our consolidated statements of comprehensive income. The following is a reconciliation of net income in accordance with GAAP to adjusted net income for the three-month periods ended September 30, 2018 and 2017 (amounts in thousands, except per share data):

	Three Months Ended September 30,
	2018						2017
	Amount			Fully Diluted Earnings per Share			Amount			Fully Diluted Earnings per Share
GAAP net income	$	4,794		$	0.10		$	4,669		$	0.11
Adjustments to net income:
Acquisition and integration costs		805			0.02			3,378			0.08
Intangible amortization		2,608			0.06			1,993			0.05
Inventory step-up charges		—			—			2,720			0.06
Non-cash interest expense		1,071			0.02			1,002			0.02
Tax effect of intangible amortization and acquisition and integration costs		(248	)		(0.01	)		(577	)		(0.01	)

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	Three Months Ended September 30,
	2018				2017
	Amount		Fully Diluted Earnings per Share		Amount			Fully Diluted Earnings per Share
Release of valuation allowance on deferred tax assets		—		—		(6,611	)		(0.16	)
Adjusted net income	$	9,030	$	0.19	$	6,574		$	0.15

Per share totals may not add due to rounding.

The following is a reconciliation of net income in accordance with GAAP to non-GAAP adjusted net income for the nine-month periods ended September 30, 2018 and 2017 (amounts in thousands, except per share data):

	Nine Months Ended September 30,
	2018						2017
	Amount			Fully Diluted Earnings per Share			Amount			Fully Diluted Earnings per Share
GAAP net income	$	10,979		$	0.24		$	16,175		$	0.43
Adjustments to net income:
Acquisition and integration costs		2,313			0.05			6,165			0.16
Intangible amortization		7,906			0.18			3,476			0.09
Inventory step-up charges		—			—			2,944			0.08
Non-cash interest expense		3,160			0.07			2,958			0.08
Tax effect of intangible amortization and acquisition and integration costs		(779	)		(0.02	)		(781	)		(0.02	)
Release of valuation allowance on deferred tax assets		—			—			(12,236	)		(0.33	)
Adjusted net income	$	23,579		$	0.52		$	18,701		$	0.50

Adjusted EBITDA

Adjusted EBITDA is measured by taking net income as reported in accordance with GAAP, excluding investment income, interest expense, taxes, depreciation and amortization, and excluding acquisition and integration costs and inventory step-up charges booked through our consolidated statements of comprehensive income. The following is a reconciliation of net income in accordance with GAAP to adjusted EBITDA for the three- and nine-month periods ended September 30, 2018 and 2017 (amounts in thousands):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
GAAP net income	$	4,794		$	4,669		$	10,979		$	16,175
Adjustments to net income:
Investment income		(558	)		(102	)		(1,251	)		(308	)
Interest expense		1,687			1,618			5,008			4,804
Tax provision		1,829			(6,691	)		3,586			(10,476	)
Depreciation		1,273			1,130			3,871			2,988
Amortization		2,608			1,993			7,906			3,476
EBITDA		11,633			2,617			30,099			16,659
Other adjustments:
Acquisition and integration costs		805			3,378			2,313			6,165
Inventory step-up charges		—			2,720			—			2,944
Adjusted EBITDA	$	12,438		$	8,715		$	32,412		$	25,768

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Liquidity and Capital Resources

We have financed our operations primarily through revenues derived from product sales, research grants, proceeds and royalties from license arrangements, sales of equity securities and issuance of convertible debt. Our revenue for the foreseeable future will primarily be limited to our bioprocessing product revenue.

At September 30, 2018, we had cash and cash equivalents of $190,304,000 compared to cash and cash equivalents of $173,759,000 at December 31, 2017.

On August 1, 2017, we completed our acquisition of Spectrum for approximately $122.9 million in cash and 6,153,995 unregistered shares of the Company’s common stock and a working capital adjustment of $425,000 for a total purchase price of $370.9 million.

During the third quarter of 2018, the closing price of the Company’s common stock exceeded 130% of the conversion price of the Notes for more than 20 trading days of the last 30 consecutive trading days of the quarter. As a result, the Notes are convertible at the option of the holders of the Notes during the fourth quarter of 2018. The Notes have a face value of $115.0 million and a carrying value of $102.4 million and are classified as current liabilities on the Company’s consolidated balance sheet as of September 30, 2018. It is the Company’s policy and intent to settle the face value of the Notes in cash and any excess conversion premium in shares of our common stock. Between the end of the third quarter and the date of this filing, none of the Notes have been converted by the holders of such Notes.

Operating activities

For the nine-month period ended September 30, 2018, our operating activities provided cash of $27,215,000 reflecting net income of $10,979,000 and non-cash charges totaling $23,187,000 primarily related to depreciation, amortization, non-cash interest expense, deferred tax expense and stock-based compensation charges. An increase in accounts receivable consumed $1,583,000 of cash and was primarily driven by the 43% year-to-date increase in revenues. An increase in inventory levels to accommodate future revenue growth consumed $4,805,000 of cash and payment of accrued liabilities consumed $1,070,000 of cash. This utilization of cash is partially offset by $3,354,000 of cash provided by an increase in accounts payable due to the timing of payments to vendors. The remaining cash flow used in operations resulted from net unfavorable changes in various other working capital accounts.

For the nine-month period ended September 30, 2017, our operating activities provided cash of $2,233,000 reflecting net income of $16,175,000 and non-cash charges totaling $1,179,000 primarily related to depreciation, amortization, non-cash interest expense, deferred tax expense and stock-based compensation charges. An increase in accounts receivable consumed $8,472,000 of cash and was primarily due to the increase in revenues and timing of cash receipts from customers. Payments of accrued liabilities consumed $6,089,000 of cash and were mainly due to the payment of contingent consideration to Refine and Atoll related to 2016 sales milestones and the payment of certain Spectrum liabilities in the third quarter of 2017. The remaining cash flow provided by operations resulted from net unfavorable changes in various other working capital accounts.

Investing activities

Our investing activities consumed $8,580,000 of cash related to capital expenditures for the nine-month period ended September 30, 2018. Our investing activities consumed $97,075,000 of cash for the nine-month period ended September 30, 2017, primarily due to the payment of cash consideration of $112,941,000 (net of cash received) for the Spectrum Acquisition and $3,686,000 used for fixed asset additions, partially offset by net redemptions of marketable securities of $19,552,000.

Financing activities

For the nine-month period ended September 30, 2018, our financing activities provided $2,363,000 of cash. We received proceeds of $2,374,000 from stock option exercises, partially offset by cash outlays of $11,000 related to the partial conversion of the Notes in the first quarter of 2018. For the nine-month period ended September 30, 2017, our financing activities provided $129,642,000 of cash. In July 2017, we completed a public offering in which 2,807,017 shares of our common stock were sold to the public at a price of $42.75 per share. The underwriters were granted an option, which they exercised in full, to purchase an additional 421,052 shares of our common stock. Total proceeds from this offering, net of underwriting discounts, commissions and other offering expenses, totaled approximately $129.3 million. Proceeds from stock option exercises in the nine-month period ended September 30, 2017 were $2,035,000, partially offset by contingent

29

consideration payments of $1,702,000 related to the initial valuation of the likelihood that the 2016 XCell™ ATF sales milestones and Atoll revenue growth milestones would be achieved.

We do not currently use derivative financial instruments.

Working capital decreased by approximately $80,169,000 to $137,402,000 at September 30, 2018 from $217,571,000 at December 31, 2017 due to the various changes noted above.

Our future capital requirements will depend on many factors, including the following:

• the expansion of our bioprocessing business;

• our identification and execution of strategic acquisitions or business combinations;

• the ability to sustain sales and profits of our bioprocessing products;

• market acceptance of our new products;

• our ability to acquire additional bioprocessing products;

• the resources required to successfully integrate our recently acquired businesses and recognize expected synergies;

• the scope of and progress made in our research and development activities;

• the extent of any share repurchase activity;

• the election of any Note holders to convert their Notes during an eligible period; and

• the success of any proposed financing efforts.

Absent acquisitions of additional businesses, products, product candidates or intellectual property, we believe our current cash balances are adequate to meet our cash needs for at least twelve months from the date of this filing. We expect operating expenses to increase as we integrate Spectrum into our business, continue to develop and expand our bioprocessing product lines and expand our commercial capabilities for the foreseeable future. Our future capital requirements may include, but are not limited to, purchases of property, plant and equipment, the acquisition of additional bioprocessing products and technologies to complement our existing manufacturing capabilities, continued investment in our intellectual property portfolio and future repayment of convertible debt.

We plan to continue to invest in our bioprocessing business and in key research and development activities associated with the development of new bioprocessing products. We actively evaluate various strategic transactions on an ongoing basis, including monetizing existing assets and licensing or acquiring complementary products, technologies or businesses that would complement our existing portfolio of development programs. We continue to seek to acquire such potential assets that may offer us the best opportunity to create value for our shareholders. In order to acquire such assets, we may need to seek additional financing to fund these investments. This may require the issuance or sale of additional equity or debt securities. The sale of additional equity may result in additional dilution to our stockholders. Should we need to secure additional financing to acquire a product, fund future investment in research and development, or meet our future liquidity requirements, we may not be able to secure such financing, or obtain such financing on favorable terms because of the volatile nature of the biotechnology marketplace.

Contractual Obligations and Commitments

In February 2018, we entered into an agreement to lease 63,761 square feet of office and manufacturing space in Marlborough, Massachusetts from U.S. REIF 111 Locke Drive Massachusetts, LLC (the “Premises”).

The lease commences during the second quarter of 2018 (the “Commencement Date”) and shall continue for a period of 126 consecutive months, unless earlier terminated in accordance with the terms of the lease (the “Lease Term”). Under the lease, the Company has the option to extend the Lease Term for two additional five-year periods.

Fixed rent with respect to 40,000 square feet of the Premises only, shall commence on the Commencement Date, and rent for the full 63,761 square feet of the Premises shall begin 19 months following the Commencement Date. Under the terms of the lease, the Company has provided a letter of credit of approximately $163,000 as a security deposit and is required to pay its pro rata share of any building operating expenses and real estate taxes.

Other than the lease detailed above, there were no material changes to our contractual obligations during the three- and nine-month periods ended September 30, 2018. For a complete discussion of our contractual obligations, please refer to Part II,

30

Item 7., “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” in our Annual Report on Form 10-K for the year ended December 31, 2017 filed with the SEC.

Off-Balance Sheet Arrangements

We do not have any special purpose entities or off-balance sheet financing arrangements as of September 30, 2018.

Cautionary Statement Regarding Forward-Looking Statements

This Quarterly Report on Form 10-Q contains forward-looking statements which are made pursuant to the safe harbor provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended (the “Exchange Act”). The forward-looking statements in this Quarterly Report on Form 10-Q do not constitute guarantees of future performance. Investors are cautioned that statements in this Quarterly Report on Form 10-Q which are not strictly historical statements, including, without limitation, express or implied statements or guidance regarding current or future financial performance and position, potential impairment of future earnings, management’s strategy, plans and objectives for future operations or acquisitions, product development and sales, agreements with our current or potential customers, product candidate research, development and regulatory approval, selling, general and administrative expenditures, intellectual property, development and manufacturing plans, availability of materials and product and adequacy of capital resources, repayment of our convertible senior notes and financing plans constitute forward-looking statements. These forward-looking statements are based on current expectations, estimates, forecasts and projections about the industry and markets in which the Company operates, and management’s beliefs and assumptions. The Company undertakes no obligation to publicly update or revise the statements in light of future developments. In addition, other written or oral statements that constitute forward-looking statements may be made by the Company or on the Company’s behalf. Words such as “expect,” “seek,” “anticipate,” “intend,” “plan,” “believe,” “could,” “estimate,” “may,” “target,” “project,” or variations of such words and similar expressions are intended to identify forward-looking statements. Such forward-looking statements are subject to a number of risks and uncertainties that could cause actual results to differ materially from those anticipated, including, without limitation, risks associated with: the success of current and future collaborative or supply relationships, including our agreements with GE Healthcare and MilliporeSigma, our ability to successfully grow our bioprocessing business, including as a result of acquisitions, commercialization or partnership opportunities, and our ability to develop and commercialize products, our ability to obtain required regulatory approvals, our compliance with all Food and Drug Administration regulations, our ability to obtain, maintain and protect intellectual property rights for our products, the risk of litigation regarding our patent and other intellectual property rights, the risk of litigation with collaborative partners, our limited manufacturing capabilities and our dependence on third-party manufacturers and value-added resellers, our ability to hire and retain skilled personnel, the market acceptance of our products, reduced demand for our products that adversely impacts our future revenues, cash flows, results of operations and financial condition, our ability to compete with larger, better financed life sciences companies, our history of losses and expectation of incurring losses, our ability to generate future revenues, our ability to successfully integrate our recently acquired businesses, our ability to raise additional capital to fund potential acquisitions, our volatile stock price, and the effects of our anti-takeover provisions. Further information on potential risk factors that could affect our financial results are included in the filings made by us from time to time with the Securities and Exchange Commission, including Part I, Item 1A. “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2017.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Interest Rate Risk

We have historically invested funds in U.S. Government and agency securities. As a result, we have been exposed to potential loss from market risks that may occur as a result of changes in interest rates, changes in credit quality of the issuer or otherwise. As of September 30, 2018, we do not have any such investments; however, we may seek to invest funds in similar investment vehicles in the future, as specified in our investment policy guidelines. Our investment policy limits the amount of our credit exposure to any one issuer, (with the exception of U.S. government and agency securities) and type of instrument.

Foreign Exchange Risk

The reporting currency of the Company is U.S. dollars, and the functional currency of each of our foreign subsidiaries is its respective local currency. Our foreign currency exposures include the Swedish kronor, Euro, British pound, Chinese yuan, Japanese yen, Singapore dollar, South Korean won and Indian rupee; of these, the primary foreign currency exposures are the Swedish kronor, Euro and British pound. Exchange gains or losses resulting from the translation between the transactional currency and the functional currency are included in net income. Fluctuations in exchange rates may adversely affect our

31

results of operations, financial position and cash flows. We currently do not seek to hedge this exposure to fluctuations in exchange rates.

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

The Company’s management, with the participation of the principal executive officer and the principal financial officer, has evaluated the effectiveness of the Company’s disclosure controls and procedures (as defined in Rules 13a-15(e) or 15d-15(e) under the Securities Exchange Act of 1934, as amended (the “Exchange Act”) as of the end of the period covered by this report. Based on such evaluation, the principal executive officer and principal financial officer have concluded that, as of the end of such period, the Company’s disclosure controls and procedures were effective in ensuring that information required to be disclosed by the Company in the reports that it files or submits under the Exchange Act is recorded, processed, summarized and reported, on a timely basis, and is accumulated and communicated to the Company’s management, including the Company’s principal executive officer and the Company’s principal financial officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

During the three-month period ended September 30, 2018, we formally included Spectrum LifeSciences, LLC in our internal controls structure. Other than the foregoing, there have been no changes in our internal control over financial reporting identified in connection with the evaluation required by paragraph (d) of Securities Exchange Act Rule 13a-15 or Rule 15d-15 that occurred in the three months ended September 30, 2018 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS

From time to time, we may be subject to legal proceedings and claims in the ordinary course of business. We are not currently aware of any such proceedings or claims that we believe will have, individually or in the aggregate, a material adverse effect on our business, financial condition or results of operations.

ITEM 1A. RISK FACTORS

The matters discussed in this Quarterly Report on Form 10-Q include forward-looking statements that involve risks or uncertainties. These statements are neither promises nor guarantees, but are based on various assumptions by management regarding future circumstances, over many of which Repligen has little or no control. A number of important risks and uncertainties, including those identified under the caption “Risk Factors” in Part I, Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2017 and subsequent filings, could cause our actual results to differ materially from those in the forward-looking statements. There are no material changes to the risk factors described in our Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

ITEM 6. EXHIBITS

(a) Exhibits

Exhibit Number	Document Description
3.1	Restated Certificate of Incorporation, dated September 30, 1992 and amended September  17, 1999 (filed as Exhibit 3.1 to Repligen Corporation’s Quarterly Report on Form 10-Q for the quarter ended September 30, 1999 and incorporated herein by reference).
3.2	Certificate of Amendment to the Certificate of Incorporation of Repligen Corporation, effective as of May  16, 2014 (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 19, 2014 and incorporated herein by reference).
3.3	Second Amended and Restated Bylaws (filed as Exhibit 3.1 to Repligen Corporation’s Current Report on Form 8-K filed on May 23, 2017 and incorporated herein by reference).
4.1 +	Second Supplemental Indenture, dated as of October 31, 2018, to Indenture for Senior Debt Securities, dated May 24, 2016, by and between Repligen Corporation and Wilmington Trust Association.
31.1 +	Rule 13a-14(a)/15d-14(a) Certification.
31.2 +	Rule 13a-14(a)/15d-14(a) Certification.
32.1*	Certification pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101+	The following materials from Repligen Corporation on Form 10-Q for the quarterly period ended September 30, 2018, formatted in Extensible Business Reporting Language (xBRL): (i) Condensed Consolidated Statements of Comprehensive Income (Loss), (ii) Condensed Consolidated Balance Sheets, (iii) Condensed Consolidated Statements of Cash Flows, and (iv) Notes to Condensed Consolidated Financial Statements, tagged as blocks of text.

+ Filed herewith.

* Furnished herewith.

33

SIGNATURES

Pursuant to the requirements 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.

	REPLIGEN CORPORATION
Date: November 1, 2018	By:	/S/ TONY J. HUNT
		Tony J. Hunt
		President and Chief Executive Officer
		(Principal executive officer)
		Repligen Corporation

Date: November 1, 2018	By:	/S/ JON SNODGRES
		Jon Snodgres
		Chief Financial Officer
		(Principal financial officer)
		Repligen Corporation

34

EX-4.1

Exhibit 4.1

REPLIGEN CORPORATION

AND

WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Trustee

SECOND SUPPLEMENTAL INDENTURE

Dated as of October 31, 2018

to Indenture for Senior Debt Securities

Dated as of May 24, 2016

2.125% Convertible Senior Notes due 2021

SECOND SUPPLEMENTAL INDENTURE dated as of October 31, 2018 (this “Second Supplemental Indenture”), between REPLIGEN CORPORATION, a Delaware corporation, as issuer (the “Company,” as more fully set forth in Section 1.01 of the First Supplemental Indenture (the “First Supplemental Indenture”), dated as of May 24, 2016, by and between the Company and WILMINGTON TRUST, NATIONAL ASSOCIATION, a national banking association, as trustee (the “Trustee,” as more fully set forth in Section 1.01 of the First Supplemental Indenture)), and the Trustee, supplementing the Indenture for Senior Debt Securities dated as of May 24, 2016, between the Company and the Trustee (the “Base Indenture” and the Base Indenture, as amended and supplemented by the First Supplemental Indenture and this Second Supplemental Indenture, and as it may be further amended or supplemented from time to time with respect to the Notes, the “Indenture”).

W I T N E S S E T H:

WHEREAS, the Company and the Trustee entered into the Base Indenture to provide, among other things, for the issuance, from time to time, of the Company’s Securities, in an unlimited aggregate principal amount, in one or more series to be established by the Company under, and authenticated and delivered as provided in, the Base Indenture;

WHEREAS, the Company and the Trustee entered into the First Supplemental Indenture to provide for a single series of Securities designated as its 2.125% Convertible Senior Notes due 2021 (the “Notes” and each $1,000 principal amount thereof, unless the context otherwise requires, a “Note”), initially in an aggregate principal amount not to exceed $115,000,000, and in order to provide the terms and conditions upon which the Notes are to be authenticated, issued and delivered;

WHEREAS, on May 24, 2016, the Company issued and delivered and the Trustee authenticated $115,000,000 aggregate principal amount of Notes under the Base Indenture, as amended and supplemented by the First Supplemental Indenture;

WHEREAS, Section 10.02(l) of the First Supplemental Indenture provides that the Company and the Trustee, may from time to time and at any time and without the consent of any Holder enter into an indenture or indentures supplemental thereto to conform the provisions of the Indenture or the Notes to the “Description of notes” section of the Prospectus Supplement as evidenced in an Officer’s Certificate;

WHEREAS, the Company has provided to the Trustee an Officer’s Certificate in accordance with Sections 10.02(l) and 10.06 of the First Supplemental Indenture and 13.07 of the Base Indenture and Opinion of Counsel in accordance with Section 10.06 of the First Supplemental Indenture and Section 13.07 of the Base Indenture, which Officer’s Certificate and Opinion of Counsel state, among other things, that the amendment to certain terms of the First Supplemental Indenture, pursuant to and as set forth in this Second Supplemental Indenture, conform such terms to the text of the description of such terms in the “Description of notes” section of the Prospectus Supplement; and

1

WHEREAS the Company has requested and hereby directs that the Trustee execute and deliver this Second Supplemental Indenture;

WHEREAS, all acts and things necessary to make this Second Supplemental Indenture a valid agreement according to its terms, have been done and performed, and the execution of this Second Supplemental Indenture has in all respects been duly authorized.

NOW, THEREFORE, THIS SECOND SUPPLEMENTAL INDENTURE WITNESSETH:

That the Company and the Trustee mutually covenant and agree for the equal and proportionate benefit of the respective Holders from time to time of the Notes as follows:

ARTICLE 1

DEFINITIONS

For all purposes of the Indenture, except as otherwise expressly provided or unless the context otherwise requires:

(a)    all words, terms and phrases defined in the Base Indenture as supplemented by the First Supplemental Indenture (but not otherwise defined herein) shall have the same meanings as in the Base Indenture as supplemented by the First Supplemental Indenture;

(b)    all words and terms and phrases defined in the First Supplemental Indenture (but not otherwise defined herein) shall have the same meanings as in the First Supplemental Indenture; and

(c)    the words “herein,” “hereof” and “hereunder” and other words of similar import (i) when used with regard to any specified Article, Section or sub-division, refer to such Article, Section or sub-division of this Second Supplemental Indenture and (ii) otherwise, refer to the Indenture as a whole and not to any particular Article, Section or other subdivision.

ARTICLE 2

MODIFICATION OF INDENTURE

Subject to the terms and conditions set forth herein, pursuant to Section 10.02(l) of the First Supplemental Indenture, the definition of “Observation Period” included in Section 1.01 of the First Supplemental Indenture is hereby amended by replacing the words “May 15, 2018” in clause (iii) of the definition thereof with the words “March 1, 2021”.

ARTICLE 3

MISCELLANEOUS

(a)    Incorporation of Indenture Provisions. The parties hereto agree that the terms of Sections 17.02 (Provisions Binding on Company’s Successors), 17.04 (Governing Law; Jurisdiction), 17.09 (Execution in Counterparts) and 17.10 (Separability) of the First Supplemental Indenture are incorporated herein by reference, mutatis mutandis.

2

(b)    Miscellaneous Amendments Under Base Indenture; Ratification of Base Indenture and First Supplemental Indenture. Except as amended hereby with respect to the Notes, the Base Indenture, as amended and supplemented by the First Supplemental Indenture and this Second Supplemental Indenture, is in all respects ratified and confirmed, and this Second Supplemental Indenture shall be deemed part of the Base Indenture as supplemented by the First Supplemental Indenture in the manner and to the extent herein and therein provided.

(c)    Headings, etc. The titles and headings of the articles and sections of this Second Supplemental Indenture have been inserted for convenience of reference only, are not to be considered a part hereof, and shall in no way modify or restrict any of the terms or provisions hereof.

(d)    The Trustee. The Trustee shall not be responsible for and makes no representation as to the validity, execution or adequacy of this Second Supplemental Indenture, and is not responsible for any recital or statement herein. In entering into this Second Supplemental Indenture, the Trustee shall be entitled to the benefit of every provision of the Base Indenture, as amended and supplemented by the First Supplemental Indenture relating to the conduct of or affecting the liability of or affording protection to the Trustee.

[Remainder of page intentionally left blank]

3

IN WITNESS WHEREOF, the parties hereto have caused this Second Supplemental Indenture to be duly executed as of the date first written above.

REPLIGEN CORPORATION
By:	/s/ Jon Snodgres
	Name:  Jon Snodgres
	Title:    Chief Financial Officer

WILMINGTON TRUST, NATIONAL       ASSOCIATION, as Trustee
By:	/s/ Lynn M. Steiner
	Name:  Lynn M. Steiner
	Title:    Vice President

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Tony J. Hunt, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Repligen Corporation;

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(s) 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(s) 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: November 1, 2018

/S/ TONY J. HUNT

Tony J. Hunt

President and Chief Executive Officer

(Principal executive officer)

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Jon Snodgres, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of Repligen Corporation;

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(s) 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(s) 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: November 1, 2018

/S/ JON SNODGRES

Jon Snodgres

Chief Financial Officer

(Principal 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 Quarterly Report of Repligen Corporation (the “Company”) on Form 10-Q for the period ending September 30, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), the undersigned officers of the Company hereby 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; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: November 1, 2018	By:	/S/ TONY J. HUNT
		Tony J. Hunt
		Chief Executive Officer and President
		(Principal executive officer)

Date: November 1, 2018	By:	/S/ JON SNODGRES
		Jon Snodgres
		Chief Financial Officer
		(Principal financial officer)

* This certification shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, or otherwise subject to the liability of that section, nor shall it be deemed to be incorporated by reference into any filing under the Securities Act of 1933 or the Securities Exchange Act of 1934.

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Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Oct. 29, 2018
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2018
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Trading Symbol	RGEN
Entity Registrant Name	REPLIGEN CORP
Entity Central Index Key	0000730272
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Emerging growth company	false
Smaller reporting company	false
Entity Common Stock, Shares Outstanding		43,859,319

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CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 190,304	$ 173,759
Accounts receivable, less reserve for doubtful accounts of $164 at September 30, 2018 and $58 at December 31, 2017, respectively	30,784	27,585
Royalties and other receivables	46	153
Inventories, net	42,284	39,004
Prepaid expenses and other current assets	3,830	2,281
Total current assets	267,248	242,782
Property, plant and equipment, net	29,359	22,417
Intangible assets, net	136,534	144,753
Goodwill	326,977	327,333
Other assets	2,007	6,234
Total assets	762,125	743,519
Current liabilities:
Accounts payable	9,482	7,282
Accrued liabilities	17,964	17,929
Convertible senior notes, current portion	102,400
Total current liabilities	129,846	25,211
Convertible senior notes, net		99,250
Deferred tax liabilities	21,120	25,167
Other long-term liabilities	4,672	2,343
Commitments and contingencies (Note 14)
Stockholders' equity:
Preferred stock, $.01 par value, 5,000,000 shares authorized, no shares issued or outstanding
Common stock, $.01 par value, 80,000,000 shares authorized, 43,853,389 shares at September 30, 2018 and 43,587,079 shares at December 31, 2017 issued and outstanding	439	436
Additional paid-in capital	639,027	628,983
Accumulated other comprehensive loss	(11,773)	(6,363)
Accumulated deficit	(21,206)	(31,508)
Total stockholders' equity	606,487	591,548
Total liabilities and stockholders' equity	$ 762,125	$ 743,519

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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Accounts receivable, reserve for doubtful accounts	$ 164	$ 58
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	5,000,000	5,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	80,000,000	80,000,000
Common stock, shares issued	43,853,389	43,587,079
Common stock, shares outstanding	43,853,389	43,587,079

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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue:
Revenue	$ 49,529	$ 36,580	$ 142,090	$ 99,624
Operating expenses:
Cost of product revenue	22,183	19,987	62,939	47,913
Research and development	3,601	2,001	12,669	5,603
Selling, general and administrative	15,859	14,998	48,347	35,365
Total operating expenses	41,643	36,986	123,955	88,881
Income (loss) from operations	7,886	(406)	18,135	10,743
Other income (expenses):
Investment income	558	102	1,251	308
Interest expense	(1,687)	(1,618)	(5,008)	(4,804)
Other (expenses) income	(134)	(100)	187	(548)
Total other expenses, net	(1,263)	(1,616)	(3,570)	(5,044)
Income (loss) before income taxes	6,623	(2,022)	14,565	5,699
Income tax provision (benefit)	1,829	(6,691)	3,586	(10,476)
Net income	$ 4,794	$ 4,669	$ 10,979	$ 16,175
Earnings per share:
Basic	$ 0.11	$ 0.11	$ 0.25	$ 0.44
Diluted	$ 0.10	$ 0.11	$ 0.24	$ 0.43
Weighted average shares outstanding:
Basic	43,822,472	41,236,554	43,728,503	36,435,591
Diluted	45,828,175	42,563,002	45,132,115	37,386,333
Other comprehensive income:
Unrealized gain on investments				$ 5
Foreign currency translation (loss) gain	$ (630)	$ 2,025	$ (5,410)	7,097
Comprehensive income	4,164	6,694	5,569	23,277
Product Revenue
Revenue:
Revenue	49,500	36,514	142,042	99,516
Royalty and Other Revenue
Revenue:
Revenue	$ 29	$ 66	$ 48	$ 108

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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Cash flows from operating activities:
Net income	$ 10,979	$ 16,175
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	11,775	6,374
Provision for doubtful accounts	107
Non-cash interest expense	3,160	2,958
Stock-based compensation expense	7,672	4,845
Deferred tax expense	472	(13,062)
Loss on conversion of convertible senior notes	1
Loss on disposal of assets		64
Changes in assets and liabilities:
Accounts receivable	(1,583)	(8,472)
Other receivables	(149)	196
Inventories	(4,805)	699
Prepaid expenses and other current assets	(1,437)	(739)
Other assets	(1,348)	(704)
Accounts payable	3,354	159
Accrued liabilities	(1,070)	(6,089)
Long-term liabilities	87	(171)
Net cash provided by operating activities	27,215	2,233
Cash flows from investing activities:
Acquisition of Spectrum Inc., net of cash received		(112,941)
Purchases of marketable securities		(48)
Redemptions of marketable securities		19,600
Purchases of property, plant and equipment	(8,580)	(3,686)
Net cash used in investing activities	(8,580)	(97,075)
Cash flows from financing activities:
Proceeds from issuance of common stock, net of issuance costs		129,309
Exercise of stock options	2,374	2,035
Repayment of senior convertible notes	(11)
Payment of contingent consideration		(1,702)
Net cash provided by financing activities	2,363	129,642
Effect of exchange rate changes on cash and cash equivalents	(4,453)	2,633
Net increase in cash, cash equivalents and restricted cash	16,545	37,433
Cash, cash equivalents and restricted cash, beginning of period	173,759	122,233
Cash, cash equivalents and restricted cash, end of period	190,304	159,666
Cash paid during the period for:
Income taxes	3,120	3,555
Interest	1,222	1,222
Non-cash investing and financing activities:
Non-cash effect of adoption of ASU 2016-16	5,609
Payment of contingent consideration in common stock		1,062
Stock tendered for acquisition of Spectrum		$ 247,575
Property, plant and equipment related to lease incentives	$ 2,270

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Basis of Presentation

9 Months Ended

Sep. 30, 2018

Basis of Presentation

1. Basis of Presentation

The condensed consolidated financial statements included herein have been prepared by Repligen Corporation (the “Company”, “Repligen” or “we”) in accordance with generally accepted accounting principles in the United States (“U.S. GAAP”) and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”), for Quarterly Reports on Form 10-Q and Article 10 of Regulation S-X and do not include all of the information and footnote disclosures required by U.S. GAAP. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and accompanying notes thereto included in the Company’s Annual Report on Form 10-K for the fiscal year ended December 31, 2017.

The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

The condensed consolidated financial statements include the accounts of the Company and its wholly-owned subsidiaries, Repligen Sweden AB (“Repligen Sweden”), Repligen GmbH, Repligen Singapore Pte. Ltd., our former subsidiary, TangenX Technology Corporation (“TangenX,” which was acquired on December 14, 2016 and merged into the Company as of June 30, 2017) and Spectrum LifeSciences, LLC (“Spectrum,” which was acquired on August 1, 2017). All significant intercompany accounts and transactions have been eliminated in consolidation.

In the opinion of management, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of only normal, recurring adjustments necessary for a fair presentation of the financial position, results of operations and cash flows. The results of operations for the interim periods presented are not necessarily indicative of results to be expected for the entire year.

Recent Accounting Standards Updates

We consider the applicability and impact of all Accounting Standards Updates on our condensed consolidated financial statements. Updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on our consolidated financial position or results of operations. Recently issued Accounting Standards Updates which we feel may be applicable to us are as follows:

Recently Issued Accounting Standard Updates – Not Yet Adopted

In February 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update No. (“ASU”) 2016-02, “Leases (Topic 842).” Subsequently, the FASB issued additional updates which clarify this guidance, including ASU 2018-01, “Leases (Topic 842): Land Easement Practical Expedient for Transitioning to Topic 842,” in January 2018, which allows an entity to elect an optional transition practical expedient to not evaluate land easements that exist or expired before the entity’s adoption of Topic 842, and ASU 2018-11, “Leases – Targeted Improvements (Topic 842),” in July 2018, that gives entities the option to not provide comparative period financial statements and instead apply the transition requirements as of the effective date of the new standard. The Company plans to adopt the new standard using this optional method. Pursuant to the guidance under ASU 2016-02, the Company also plans to elect the optional package of practical expedients, which will allow the Company to not reassess: (i) whether expired or existing contracts contain leases; (ii) lease classification for any expired or existing leases; and (iii) initial direct costs for any existing leases. The new standard also allows entities to make certain policy elections, some of which the Company also plans to elect, including: a policy to not record short-term leases on the balance sheet. The Company is currently working through lease contract scoping, design and implementation of transition related controls, and finalization of accounting elections. The Company is still assessing the impact this standard will have on its consolidated financial statements and disclosures; however, it anticipates that the new standard will result in the Company recording additional right of use assets and corresponding liabilities on its consolidated balance sheet.

In February 2018, the FASB issued ASU 2018-02, “Income Statement – Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income,” which gives entities the option to reclassify to retained earnings tax effects related to items that have been stranded in accumulated other comprehensive income as a result of the Tax Cuts and Jobs Act (the “Act”). For all entities, the guidance is effective for fiscal years beginning after December 15, 2018, and interim periods within those fiscal years. Entities can choose whether to apply the amendments retrospectively to each period in which the effect of the Act is recognized or to apply the amendments in the period of adoption. The Company has not assessed the impact of the new standard on its consolidated financial statements but does not expect its adoption to have a material impact on the Company’s consolidated financial statements.

In August 2018, the FASB issued ASU 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement.” ASU 2018-13 includes amendments that aim to improve the effectiveness of fair value measurement disclosures. The amendments in this guidance modify the disclosure requirements on fair value measurements based on the concepts in FASB Concepts Statement, “Conceptual Framework for Financial Reporting – Chapter 8: Notes to Financial Statements,” including the consideration of costs and benefits. The amendments become effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements.

In August 2018, the FASB issued ASU 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.” ASU 2018-15 aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The guidance also requires the entity to expense the capitalized implementation costs of a hosting arrangement that is a service contract over the term of the hosting arrangement, which includes reasonably certain renewals. The guidance becomes effective for the Company in the year ending December 31, 2020 and early adoption is permitted. The Company is currently assessing the impact that this guidance will have on its consolidated financial statements.

Recently Issued Accounting Standard Updates – Adopted During the Period

In May 2014, the FASB issued ASU 2014-09, “Revenue from Contracts with Customers (Topic 606),” (“ASC 606”) which supersedes the revenue recognition requirements in Accounting Standards Codification (“ASC”) Topic 605, “Revenue Recognition,” and creates a new Topic 606, “Revenue from Contracts with Customers.” Two adoption methods are permitted: retrospectively to all prior reporting periods presented, with certain practical expedients permitted; or retrospectively with the cumulative effect of initially adopting the ASU recognized at the date of initial application. The adoption of this ASU included updates as provided under ASU 2015-14, “Revenue from Contracts with Customers (Topic 606): Deferral of the Effective Date”; ASU 2016-08, “Revenue from Contracts with Customers (Topic 606): Principal versus Agent Considerations (Reporting Revenue Gross versus Net)”; ASU 2016-10, “Revenue from Contracts with Customers (Topic 606): Identifying Performance Obligations and Licensing”; and ASU 2016-12, “Revenue from Contracts with Customers (Topic 606): Narrow-Scope Improvements and Practical Expedients.” The Company adopted the provisions of ASC 606 using the modified retrospective method effective January 1, 2018. See Note 3 for further discussion of the effects of this standard on the Company’s consolidated financial statements.

In August 2016, the FASB issued ASU 2016-15, “Statement of Cash Flows (Topic 203): Classification of Certain Cash Receipts and Cash Payments.” ASU 2016-15 addresses eight specific cash flow issues and clarifies their presentation and classification in the Statement of Cash Flows. ASU 2016-15 is effective for fiscal years beginning after December 15, 2017 and is to be applied retrospectively with early adoption permitted. The Company has historically classified payments up to the amount of its contingent consideration liability recognized at the date of its acquisition as financing activities, with additional payments classified as operating activities. Because the Company has classified its contingent consideration payments as required by this standard, the adoption of this standard did not have any impact on its consolidated financial statements when applied on a retrospective basis.

In October 2016, the FASB issued ASU 2016-16, “Intra-Entity Transfers of Assets Other Than Inventory.” ASU 2016-16 requires that the income tax consequences of an intra-entity asset transfer other than inventory are recognized at the time of the transfer. An entity will continue to recognize the income tax consequences of an intercompany transfer of inventory when the inventory is sold to a third party. The Company adopted this standard on a modified-retrospective basis on January 1, 2018. See Note 12 for a discussion of the impact of this ASU on the Company’s consolidated financial statements.

In November 2016, the FASB issued ASU 2016-18, “Statement of Cash Flows (Topic 230): Restricted Cash,” which requires that the statement of cash flows explain the change during the period in the total cash, which is inclusive of cash and cash equivalents and amounts generally described as restricted cash or restricted cash equivalents. Restricted cash and restricted cash equivalents will be included with cash and cash equivalents when reconciling the beginning of period and end of period balances on the statement of cash flows upon adoption of this standard. The Company adopted this standard on a retrospective basis on January 1, 2018. The adoption resulted in an increase to cash, cash equivalents and restricted cash of $450,000 in the statement of cash flows at December 31, 2016 and September 30, 2017. The Company did not hold any restricted cash at December 31, 2017 or September 30, 2018.

In January 2017, the FASB issued ASU 2017-01, “Business Combinations (Topic 805): Clarifying the Definition of a Business”, which clarifies the definition of a business to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The Company adopted this standard as of January 1, 2018, and the adoption of ASU 2017-01 did not have a material impact on the Company’s consolidated financial statements.

In January 2017, the FASB issued ASU 2017-04, “Intangibles–Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment,” eliminating the requirement to calculate the implied fair value, essentially eliminating step two from the goodwill impairment test. ASU 2017-04 requires goodwill impairment to be based upon the results of step one of the impairment test, which is defined as the excess of the carrying value of a reporting unit over its fair value. The impairment charge will be limited to the amount of goodwill allocated to that reporting unit. The standard is effective for the Company on a prospective basis beginning on January 1, 2020, with early adoption permitted. The Company adopted this standard as of January 1, 2018, and the adoption of this standard did not have a material impact on the Company’s consolidated financial statements.

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Acquisition of Spectrum LifeSciences, LLC

9 Months Ended

Sep. 30, 2018

Acquisition of Spectrum LifeSciences, LLC

2. Acquisition of Spectrum LifeSciences, LLC

On August 1, 2017, the Company completed the acquisition of Spectrum pursuant to the terms of an Agreement and Plan of Merger and Reorganization, dated as of June 22, 2017 (such acquisition, the “Spectrum Acquisition”).

Spectrum is a diversified filtration company with a differentiated portfolio of hollow fiber cartridges, benchtop to commercial scale filtration and perfusion systems and a broad portfolio of disposable and single-use solutions. Spectrum’s products are primarily used for the filtration, isolation, purification and concentration of monoclonal antibodies, vaccines, recombinant proteins, diagnostic products and cell therapies where the company offers both standard and customized solutions to its bioprocessing customers.

Spectrum’s filtration products include its KrosFlo^® line of hollow fiber cartridges, tangential flow filtration (“TFF”) systems and single-use flow path consumables, as well as its Spectra/Por^® portfolio of laboratory dialysis products and its Pro-Connex^® single-use hollow fiber Module-Bag-Tubing sets. Outside of filtration, Spectrum products include Spectra/Chrom^® liquid chromatography products for research applications. These bioprocessing products account for the majority of Spectrum revenues. Spectrum also offers a line of operating room products.

Consideration Transferred

The Company accounted for the Spectrum Acquisition as a purchase of a business under ASC 805, “Business Combinations.” The Spectrum Acquisition was funded through payment of approximately $122.9 million in cash, issuance of 6,153,995 unregistered shares of the Company’s common stock totaling $247.6 million and a working capital adjustment of $425,000 for a total purchase price of $370.9 million. Under the acquisition method of accounting, the assets of Spectrum were recorded as of the acquisition date, at their respective fair values, and consolidated with those of the Company. The fair value of the net assets acquired was $370.9 million.

The consideration and purchase price information has been prepared using a valuation that required the use of significant assumptions and estimates in its preparation. Critical estimates included, but were not limited to, future expected cash flows, including projected revenues and expenses, and the applicable discount rates. These estimates were based on assumptions that the Company believes to be reasonable; however, actual results may differ from these estimates.

The total consideration transferred follows (amounts in thousands):

Cash consideration	$	122,932
Equity consideration		247,575
Working capital adjustment		425
Net assets acquired	$	370,932

Acquisition and integration-related costs are not included as a component of consideration transferred, but are expensed in the periods in which the costs are incurred. The Company has incurred $2,313,000 in integration costs related to the Spectrum Acquisition for the nine-month period ended September 30, 2018 and $7,060,000 in acquisition and integration costs for the year ended December 31, 2017. These costs are primarily included in selling, general and administrative expenses in the consolidated statements of operations.

Fair Value of Net Assets Acquired

The amounts recorded for the assets acquired and liabilities assumed are final, based on the facts and circumstances that existed as of the acquisition date. The components and allocation of the purchase price consists of the following amounts (amounts in thousands):

Cash and cash equivalents	$	10,137
Accounts receivable		5,075
Inventory		13,502
Prepaid expenses and other assets		616
Fixed assets		6,004
Deferred tax assets		1,102
Customer relationships		78,400

Developed technology		38,560
Trademark and tradename		2,160
Non-competition agreements		960
Goodwill		265,722
Accounts payable		(1,335	)
Unrecognized tax benefit		(576	)
Accrued liabilities		(5,787	)
Deferred tax liabilities		(43,608	)
Fair value of net assets acquired	$	370,932

Of the consideration paid, $78.4 million represents the fair value of customer relationships that is amortized over the weighted average determined useful life of 15 years, and $38.6 million represents the fair value of developed technology that is amortized over a weighted average determined useful life of 20 years. $960,000 represents the fair value of non-competition agreements that are amortized over a determined life of 3 years. $2.2 million represents the fair value of trademarks and trade names that are determined to have an indefinite useful life. The aforementioned intangible assets are amortized on a straight-line basis.

The goodwill of $265.7 million represents future economic benefits expected to arise from synergies from combining operations and commercial organizations to increase market presence and the extension of existing customer relationships. None of the goodwill recorded is expected to be deductible for income tax purposes.

Revenue, Net Income and Pro Forma Presentation

The Company recorded revenue from Spectrum of $13,188,000 and $37,220,000 for the three- and nine-month periods ended September 30, 2018, respectively, and $19,394,000 from August 1, 2017, the date of acquisition, through December 31, 2017. The Company has included the operating results of Spectrum in its consolidated statements of operations since the August 1, 2017 acquisition date. The following table presents unaudited supplemental pro forma information as if the Spectrum Acquisition had occurred as of January 1, 2016 (amounts in thousands, except per share data):

	Pro-forma Nine Months Ended September 30, 2017
Total revenue		121,301
Net income		14,994
Earnings per share:
Basic	$	0.36
Diluted	$	0.36

The unaudited pro forma information for the nine-month period ended September 30, 2017 was calculated after applying the Company’s accounting policies and the impact of acquisition date fair value adjustments. The unaudited pro forma net income for the nine-month period ended September 30, 2017 was adjusted to exclude acquisition-related transaction costs, as these expenses would have been incurred in the prior year assuming the Spectrum Acquisition closed on January 1, 2016.

These unaudited pro forma condensed consolidated financial results include certain adjustments to reflect the unaudited pro forma results of operations as if the acquisition had occurred as of January 1, 2016. The unaudited pro forma information does not reflect the effect of costs or synergies that would have been expected to result from the integration of the acquisition. The unaudited pro forma information does not purport to be indicative of the results of operations that actually would have resulted had the combinations occurred at the beginning of the period presented, or of future results of the consolidated entities.

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Revenue Recognition

9 Months Ended

Sep. 30, 2018

Revenue Recognition

3. Revenue Recognition

Adoption of ASC Topic 606, Revenue from Contracts with Customers

The Company adopted ASC 606 on January 1, 2018, using the modified retrospective method for all contracts not completed as of the date of adoption. For contracts that were modified before the effective date, the Company reflected the aggregate effect of all modifications when identifying performance obligations and allocating transaction price in accordance with the practical expedient in paragraph ASC 606-10-65-1-(f)-4, which did not have a material effect on the cumulative impact of adopting ASC 606. Results for reporting periods beginning January 1, 2018 are presented under ASC 606, while prior period amounts are not adjusted and continue to be reported under the accounting standards in effect for the prior period. The impact to the Company’s consolidated financial statements as a result of applying ASC 606 was immaterial. Deferred revenue resulting from contracts with customers is included in accrued expenses on the Company’s consolidated balance sheet.

Revenue Recognition

Revenue is recognized when, or as, obligations under the terms of a contract are satisfied, which occurs when control of the promised products or services is transferred to customers. Revenue is measured as the amount of consideration the Company expects to receive in exchange for transferring products or services to a customer (“transaction price”). To the extent the transaction price includes variable consideration, the Company estimates the amount of variable consideration that should be included in the transaction price utilizing the expected value method or the most likely amount method, depending on the facts and circumstances relative to the contract. Variable consideration is included in the transaction price if, in the Company’s judgment, it is probable that a significant future reversal of cumulative revenue under the contract will not occur. Estimates of variable consideration and determination of whether to include estimated amounts in the transaction price are based largely on an assessment of the Company’s anticipated performance and all information (historical, current and forecasted) that is reasonably available. Sales, value add, and other taxes collected on behalf of third parties are excluded from revenue.

When determining the transaction price of a contract, an adjustment is made if payment from a customer occurs either significantly before or significantly after performance, resulting in a significant financing component. Applying the practical expedient in paragraph 606-10-32-18, the Company does not assess whether a significant financing component exists if the period between when the Company performs its obligations under the contract and when the customer pays is one year or less. None of the Company’s contracts contained a significant financing component as of September 30, 2018.

Contracts with customers may contain multiple performance obligations. For such arrangements, the transaction price is allocated to each performance obligation based on the estimated relative standalone selling prices of the promised products or services underlying each performance obligation. The Company determines standalone selling prices based on the price at which the performance obligation is sold separately. If the standalone selling price is not observable through past transactions, the Company estimates the standalone selling price taking into account available information such as market conditions and internally approved pricing guidelines related to the performance obligations.

The Company recognizes product revenue under the terms of each customer agreement upon transfer of control to the customer, which occurs at a point in time.

Disaggregation of Revenue

Revenues for the three- and nine-month periods ended September 30, 2018 and 2017 were as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,												Nine Months Ended September 30,
	2018		2017		$ Change			% Change			2018		2017		$ Change			% Change
Product revenue	$	49,500	$	36,514	$	12,986			35.6	%	$	142,042	$	99,516	$	42,526			42.7	%
Royalty and other revenue		29		66		(37	)		(56.1	%)		48		108		(60	)		(55.6	%)
Total revenues	$	49,529	$	36,580	$	12,949			35.4	%	$	142,090	$	99,624	$	42,466			42.6	%

When disaggregating revenue, the Company considered all of the economic factors that may affect its revenues. Because all of its revenues are from bioprocessing customers, there are no differences in the nature, timing and uncertainty of the Company’s revenues and cash flows from any of its product lines. However, given that the Company’s revenues are generated in different geographic regions, factors such as regulatory and geopolitical factors within those regions could impact the nature, timing and uncertainty of the Company’s revenues and cash flows. In addition, a significant portion of the Company’s revenues are generated from two customers; therefore, economic factors specific to these two customers could impact the nature, timing and uncertainty of the Company’s revenues and cash flows.

The following tables disaggregate the Company’s revenue from contracts with customers by geographic region (amounts in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
North America	$	24,064	$	16,428	$	66,575	$	40,203
Europe		19,328		16,374		58,497		49,322
Asia and Australia		6,075		3,630		16,731		9,949
Other		62		148		287		150
Total	$	49,529	$	36,580	$	142,090	$	99,624

Revenue from significant customers is as follows (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
MilliporeSigma	$	8,791	$	5,191	$	24,181	$	17,727
GE Healthcare	$	7,743	$	6,254	$	22,253	$	24,285

Protein Products

The Company’s protein product line generates revenue through the sale of Protein A ligands and growth factors. Protein A ligands are an essential component of Protein A chromatography resins (media) used in the purification of virtually all mAb-based drugs on the market or in development. The Company manufactures multiple forms of Protein A ligands under long-term supply agreements with major life sciences companies, who in turn sell their Protein A chromatography media to end users (biopharmaceutical manufacturers). The Company also manufactures growth factors for sale under long-term supply agreements with certain life sciences companies as well as direct sales to its customers. Each protein product is considered distinct and therefore represents a separate performance obligation. Protein product revenue is generally recognized at a point in time upon transfer of control to the customer.

Filtration Products

The Company’s filtration product line generates revenue through the sale of KrosFlo^® hollow fiber (“HF”) TFF membranes and modules, ProConnex^® single-use flow path connectors, flat sheet TFF cassettes and hardware, and XCell™ alternating tangential flow (“ATF”) devices and related consumables.

The Company markets the KrosFlo line of HF cartridges and TFF systems and the ProConnex line of single-use flow path connectors which were acquired as part of the acquisition of Spectrum in August 2017. These products are used in the filtration, isolation, purification and concentration of biologics and diagnostic products. Sales of large-scale systems generally include components and consumables as well as training and installation services at the request of the customer. Because the initial sale of components and consumables are necessary for the operation of the system, such items are combined with the systems as a single performance obligation. Training and installation services do not significantly modify or customize these systems and therefore represent a distinct performance obligation.

The Company’s other filtration product offerings are not highly interdependent of one another and are therefore considered distinct products that represent separate performance obligations. Revenue on these products is generally recognized at a point in time upon transfer of control to the customer. The Company invoices the customer for the installation and training services in an amount that directly corresponds with the value to the customer of the Company’s performance to date; therefore, revenue recognized is based on the amount billable to the customer in accordance with the practical expedient under ASC 606-10-55-18.

The Company also markets flat sheet TFF cassettes and hardware. TFF is a rapid and efficient method for separation and purification of biomolecules that is widely used in laboratory, process development and process scale applications in biopharmaceutical manufacturing. The Company’s single-use Sius™ TFF cassettes and hardware are not highly interdependent of one another and are therefore considered distinct products that represent separate performance obligations. Sius TFF product revenue is generally recognized at a point in time upon transfer of control to the customer.

The Company also markets the XCell™ ATF System, a technologically advanced filtration device used in upstream processes to continuously remove cellular metabolic waste products during the course of a fermentation run, freeing healthy cells to continue producing the biologic drug of interest. ATF Systems typically include a filtration system and consumables (i.e., tube devices, metal stands) as well as training and installation services at the request of the customer. The filtration system and consumables are considered distinct products and therefore represent separate performance obligations. First time purchasers of the systems typically purchase a controller that is shipped with the tube device(s) and metal stand(s). The controller is not considered distinct as it is a proprietary product that is highly interdependent with the filtration system; therefore, the controller is combined with the filtration system and accounted for as a single performance obligation. The training and installation services do not significantly modify or customize the ATF system and therefore represent a distinct performance obligation. ATF system product revenue related to the filtration system (including the controller if applicable) and consumables is generally recognized at a point in time upon transfer of control to the customer. ATF system service revenue related to training and installation services is generally recognized over time, as the customer simultaneously receives and consumes the benefits as the Company performs. The Company invoices the customer for the installation and training services in an amount that directly corresponds with the value to the customer of the Company’s performance to date; therefore, revenue recognized is based on the amount billable to the customer in accordance with the practical expedient under ASC 606-10-55-18.

Chromatography Products

The Company’s chromatography product line includes a number of products used in the downstream purification and quality control of biological drugs. The majority of chromatography revenue relates to the OPUS pre-packed chromatography column line and Protein A chromatography resins. OPUS columns typically consist of the outer hardware of the column with a resin as ordered by the customer packed inside of the column. OPUS columns may also be ordered without the packed resin. In either scenario, the OPUS column and resin are not interdependent of one another and are therefore considered distinct products that represent separate performance obligations. Chromatography product revenue is generally recognized at a point in time upon transfer of control to the customer.

Other Products

The Company’s other products include ELISA test kits used by quality control departments to detect and measure the presence of leached Protein A and/or growth factor in the final product. Each ELISA kit is considered distinct and therefore represents a separate performance obligation. Other product revenue is generally recognized at a point in time upon transfer of control to the customer.

Transaction Price Allocated to Future Performance Obligations

Remaining performance obligations represents the transaction price of contracts for which work has not been performed or has been partially performed. The Company’s future performance obligations relate primarily to the installation and training of certain of its systems sold to customers. These performance obligations are completed within one year of receipt of a purchase order from its customers. Accordingly, the Company has elected to not disclose the value of these unsatisfied performance obligations as provided under ASC 606-10-50-14.

Contract Balances from Contracts with Customers

The following table provides information about receivables and deferred revenue from contracts with customers as of September 30, 2018 (amounts in thousands):

	2018
Balances from contracts with customers only:
Accounts receivable	$	30,784
Deferred revenue		1,234
Revenue recognized in the three-month period relating to:
The beginning deferred revenue balance	$	441
Changes in pricing related to products or services satisfied in previous periods		—

The timing of revenue recognition, billings and cash collections results in the accounts receivables and deferred revenue balances on the Company’s consolidated balance sheets. There were no impairment losses on receivables during the three- and nine-month periods ending September 30, 2018.

A contract asset is created when the Company satisfies a performance obligation by transferring a promised good to the customer. Contract assets may represent conditional or unconditional rights to consideration. The right is conditional, and recorded as a contract asset, if the Company must first satisfy another performance obligation in the contract before it is entitled to payment from the customer. Contract assets are transferred to billed receivables once the right becomes unconditional. If the Company has the unconditional right to receive consideration from the customer, the contract asset is accounted for as a billed receivable and presented separately from other contract assets. A right is unconditional if nothing other than the passage of time is required before payment of that consideration is due.

When consideration is received, or such consideration is unconditionally due, from a customer prior to transferring goods or services to the customer under the terms of a contract, a contract liability is recorded. Contract liabilities are recognized as revenue after control of the products or services is transferred to the customer and all revenue recognition criteria have been met.

Costs to Obtain or Fulfill a Customer Contract

The Company’s sales commission structure is based on achieving revenue targets. The commissions are driven by revenue derived from customer purchase orders which are short term in nature.

Applying the practical expedient in paragraph 340-40-25-4, the Company recognizes the incremental costs of obtaining contracts as an expense when incurred if the amortization period of the assets that the Company otherwise would have recognized is one year or less. These costs are included in selling, general, and administrative expenses. When shipping and handling costs are incurred after a customer obtains control of the products, the Company accounts for these as costs to fulfill the promise and not as a separate performance obligation.

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Accumulated Other Comprehensive Income

9 Months Ended

Sep. 30, 2018

Accumulated Other Comprehensive Income

4. Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income by component (amounts in thousands):

	Foreign Currency Translation Gain/ (Loss)
Balance at December 31, 2017	$	(6,363	)
Foreign currency translation loss	$	(5,410	)
Balance at September 30, 2018	$	(11,773	)

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Earnings Per Share

9 Months Ended

Sep. 30, 2018

Earnings Per Share

5. Earnings Per Share

The Company reports earnings per share in accordance with ASC Topic 260, “Earnings Per Share,” which establishes standards for computing and presenting earnings per share. Basic earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed by dividing net income available to common shareholders by the weighted-average number of common shares and dilutive common share equivalents then outstanding. Potential common share equivalents consist of restricted stock awards and the incremental common shares issuable upon the exercise of stock options. Under the treasury stock method, unexercised “in-the-money” stock options and warrants are assumed to be exercised at the beginning of the period or at issuance, if later. The assumed proceeds are then used to purchase common shares at the average market price during the period. Share-based payment awards that entitle their holders to receive non-forfeitable dividends before vesting are considered participating securities and are considered in the calculation of basic and diluted earnings per share. There were no such participating securities outstanding during the three- and nine-month periods ended September 30, 2018 and 2017.

Basic and diluted weighted average shares outstanding were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Weighted average common shares		43,822,472		41,236,554		43,728,503		36,435,591
Dilutive common stock options and restricted stock units		651,265		484,242		511,433		454,340
Dilutive effect of convertible senior notes		1,354,438		842,206		892,179		496,402
Weighted average common shares, assuming dilution		45,828,175		42,563,002		45,132,115		37,386,333

At September 30, 2018, there were outstanding options to purchase 1,033,312 shares of the Company’s common stock at a weighted average exercise price of $26.99 per share and 707,716 restricted stock units. For the three- and nine-month periods ended September 30, 2018, 329,409 and 485,520 options to purchase shares of the Company’s common stock, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of the stock options were greater than or equal to the average price of the common shares and were therefore anti-dilutive.

At September 30, 2017, there were outstanding options to purchase 749,669 shares of the Company’s common stock at a weighted average exercise price of $20.84 per share and 515,468 restricted stock units. For the three- and nine-month periods ended September 30, 2017, 162,544 and 326,572 options to purchase shares of the Company’s common stock, respectively, were excluded from the calculation of diluted earnings per share because the exercise prices of the stock options were greater than or equal to the average price of the common shares and were therefore anti-dilutive.

As provided by the terms of the indenture underlying the Company’s 2.125% Convertible Senior Notes due 2021 (the “Notes”), the Company has a choice to settle the conversion obligation for the Notes in cash, shares or any combination of the two. The Company currently intends to settle the par value of the Notes in cash and any excess conversion premium in shares. The Company applies the provisions of ASC 260, “Earnings Per Share,” subsection 10-45-44, to determine the diluted weighted average shares outstanding as it relates to the conversion spread on the Notes. Accordingly, the par value of the Notes will not be included in the calculation of diluted income per share, but the dilutive effect of the conversion premium will be considered in the calculation of diluted net income per share using the treasury stock method. The dilutive impact of the Notes is based on the difference between the Company’s current period average stock price and the conversion price of the Notes, provided there is a premium. Pursuant to this accounting standard, there is no dilution from the accreted principal of the Notes as of September 30, 2018 and September 30, 2017.

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Inventories

9 Months Ended

Sep. 30, 2018

Inventories

6. Inventories

Inventories relate to the Company’s bioprocessing business. The Company values inventory at cost or, if lower, market value, using the first-in, first-out method. The Company reviews its inventories at least quarterly and records a provision for excess and obsolete inventory based on its estimates of expected sales volume, production capacity and expiration dates of raw materials, work-in-process and finished products. Expected sales volumes are determined based on supply forecasts provided by key customers for the next 3 to 12 months. The Company writes down inventory that has become obsolete, inventory that has a cost basis in excess of its expected net realizable value, and inventory in excess of expected requirements to cost of product revenue. Manufacturing of bioprocessing finished goods is done to order and tested for quality specifications prior to shipment.

A change in the estimated timing or amount of demand for the Company’s products could result in additional provisions for excess inventory quantities on hand. Any significant unanticipated changes in demand or unexpected quality failures could have a significant impact on the value of inventory and reported operating results. During all periods presented in the accompanying financial statements, there have been no material adjustments related to a revised estimate of inventory valuations.

Work-in-process and finished products inventories consist of material, labor, outside processing costs and manufacturing overhead. Inventories consist of the following (amounts in thousands):

	September 30, 2018		December 31, 2017
Raw Materials	$	24,349	$	21,678
Work-in-process		6,278		4,756
Finished products		11,657		12,570
Total	$	42,284	$	39,004

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Property, Plant and Equipment

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment

7. Property, Plant and Equipment

Property, plant and equipment consist of the following (amounts in thousands):

	September 30, 2018			December 31, 2017
Land	$	1,023		$	1,023
Buildings		764			764
Leasehold improvements		15,940			15,673
Equipment		23,405			21,904
Furniture and fixtures		5,156			4,272
Construction in progress		10,086			2,581
Total property, plant and equipment		56,374			46,217
Less: accumulated depreciation		(27,015	)		(23,800	)
Property, plant and equipment, net	$	29,359		$	22,417

Depreciation expense totaled approximately $3,871,000 and $2,988,000 for the nine-month periods ended September 30, 2018 and 2017, respectively.

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Intangible Assets

9 Months Ended

Sep. 30, 2018

Intangible Assets

8. Intangible Assets

Intangible assets are amortized over their useful lives using the straight-line method, as applicable, and the amortization expense is recorded within selling, general and administrative expense in the Company’s condensed consolidated statements of comprehensive income.

The Company reviews its indefinite-lived intangible assets not subject to amortization to determine if adverse conditions exist or a change in circumstances exists that would indicate an impairment. Intangible assets and their related useful lives are reviewed at least annually to determine if any adverse conditions exist that would indicate the carrying value of these assets may not be recoverable. More frequent impairment assessments are conducted if certain conditions exist, including a change in the competitive landscape, any internal decisions to pursue new or different technology strategies, a loss of a significant customer, or a significant change in the marketplace, including changes in the prices paid for our products or changes in the size of the market for our products. An impairment results if the carrying value of the asset exceeds the estimated fair value of the asset. If the estimate of an intangible asset’s remaining useful life is changed, the remaining carrying amount of the intangible asset is amortized prospectively over the revised remaining useful life. The Company continues to believe that its intangible assets are recoverable at September 30, 2018.

Intangible assets consisted of the following at September 30, 2018 (amounts in thousands):

	Gross Carrying Amount		Accumulated Amortization			Weighted Average Useful Life (in years)
Technology – developed	$	51,689	$	(5,221	)		19
Patents		240		(240	)		8
Customer relationships		101,563		(14,821	)		14
Trademark – definite lived		2,160		(131	)		20
Trademark – indefinite lived		700		—			—
Other intangibles		1,061		(466	)		3
Total intangible assets	$	157,413	$	(20,879	)		16

Intangible assets consisted of the following at December 31, 2017 (amounts in thousands):

	Gross Carrying Amount		Accumulated Amortization			Weighted Average Useful Life (in years)
Technology – developed	$	51,801	$	(3,201	)		19
Patents		240		(238	)		8
Customer relationships		102,120		(9,636	)		14
Trademarks – definite lived		2,160		(47	)		20
Trademarks – indefinite lived		700		—			—
Other intangibles		1,063		(209	)		3
Total intangible assets	$	158,084	$	(13,331	)		16

Amortization expense for amortized intangible assets was approximately $7,906,000 and $3,476,000 for the nine-month periods ended September 30, 2018 and 2017, respectively. As of September 30, 2018, the Company expects to record amortization expense as follows (amounts in thousands):

Years Ending	Amortization Expense
December 31, 2018 (three months remaining)	$	2,636
December 31, 2019		10,433
December 31, 2020		9,854
December 31, 2021		9,363
December 31, 2022		9,361

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Accrued Liabilities

9 Months Ended

Sep. 30, 2018

Accrued Liabilities

9. Accrued Liabilities

Accrued liabilities consist of the following (amounts in thousands):

	September 30, 2018		December 31, 2017
Employee compensation	$	7,986	$	9,560
Taxes		2,719		1,668
Related party payable		1,728		—
Royalty and license fees		1,065		1,383
Accrued purchases		261		1,191
Warranties		605		598
Professional fees		563		947
Deferred revenue		1,234		960
Other accrued expenses		1,803		1,622
Total	$	17,964	$	17,929

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Convertible Senior Notes

9 Months Ended

Sep. 30, 2018

Convertible Senior Notes

10. Convertible Senior Notes

The carrying value of the Notes is as follows (amounts in thousands):

	September 30, 2018			December 31, 2017
2.125% Convertible Senior Notes due 2021:
Principal amount	$	114,989		$	115,000
Unamortized debt discount		(10,706	)		(13,395	)
Unamortized debt issuance costs		(1,883	)		(2,355	)
Total Convertible Senior Notes	$	102,400		$	99,250
Less: Current portion		(102,400	)		—
Total Convertible Senior Notes, long-term	$	—		$	99,250

On May 24, 2016, the Company issued $115.0 million aggregate principal amount of its Notes. The net proceeds from the sale of the Notes, after deducting the underwriting discounts and commissions and other related offering expenses, were approximately $111.1 million. The Notes bear interest at the rate of 2.125% per annum, payable semiannually in arrears on June 1 and December 1 of each year, beginning December 1, 2016.

The Notes will mature on June 1, 2021, unless earlier repurchased, redeemed or converted in accordance with their terms. Prior to March 1, 2021, the Notes will be convertible at the option of holders of the Notes only upon satisfaction of certain conditions and during certain periods, and thereafter, the Notes will be convertible at any time until the close of business on the second scheduled trading day immediately preceding the maturity date. Upon conversion, holders of the Notes will receive shares of the Company’s common stock, cash or a combination thereof, at the Company’s election. It is the Company’s current intent and policy to settle all conversions through combination settlement, which involves satisfying the principal amount outstanding with cash and any note conversion value over the principal amount in shares of the Company’s common stock.

Notes with a par value of $11,000 were submitted for conversion in the fourth quarter of 2017, and this conversion was settled in the first quarter of 2018. The conversion resulted in the issuance of a nominal amount of shares of the Company’s common stock, and the Company recorded a loss of $1,000 on the conversion of these Notes.

During the third quarter of 2018, the closing price of the Company’s common stock exceeded 130% of the conversion price of the Notes for more than 20 trading days of the last 30 consecutive trading days of the quarter. As a result, the Notes are convertible at the option of the holders of the Notes during the fourth quarter of 2018, the quarter immediately following the quarter when the conditions were met, as stated in the terms of the Notes. These terms were also met in the second quarter of 2018 and as a result, the Company reclassified the carrying value of the Notes from long-term liabilities to current liabilities on the Company’s consolidated balance sheet as of June 30, 2018. As of September 30, 2018, the if-converted value of the Notes exceeded the aggregate principal amount by approximately $87.4 million. As of the date of this filing, no Notes were converted by the holders of such Notes in the third quarter of 2018. In the event the closing price conditions are met in the fourth quarter of 2018 or a future fiscal quarter, the Notes will be convertible at a holder’s option during the immediately following fiscal quarter.

The conversion rate for the Notes will initially be 31.1813 shares of the Company’s common stock per $1,000 principal amount of Notes, which is equivalent to an initial conversion price of approximately $32.07 per common share, and is subject to adjustment under the terms of the Notes. Holders of the Notes may require the Company to repurchase their Notes upon the occurrence of a fundamental change prior to maturity for cash 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 excluding, the repurchase date.

The Company will not have the right to redeem the Notes prior to June 5, 2019, but may redeem the Notes, at its option, in whole or in part, on any business day on or after June 5, 2019 and prior to the maturity date if the last reported sale price of the Company’s common stock has been at least 130% of the conversion price then in effect for at least 20 trading days (whether or not consecutive) during any 30 consecutive trading day period ending on, and including, the trading day immediately preceding the date on which the Company provides written notice of redemption. The redemption price will be equal to 100% of the principal amount of the principal amount of Notes to be redeemed plus accrued and unpaid interest to, but excluding, the redemption date.

The Notes contain customary terms and events of default. If an event of default (other than certain events of bankruptcy, insolvency or reorganization involving the Company) occurs and is continuing, the holders of at least 25% in aggregate principal amount of the outstanding Notes may declare 100% of the principal of, and any accrued and unpaid interest on, all of the Notes to be due and payable. Upon the occurrence of certain events of bankruptcy, insolvency or reorganization involving the Company, 100% of the principal of and accrued and unpaid interest, if any, on all of the Notes will become due and payable automatically. Notwithstanding the foregoing, the Notes provide that, to the extent the Company elects and for up to 270 days, the sole remedy for an event of default relating to certain failures by the Company to comply with certain reporting covenants consist exclusively of the right to receive additional interest on the Notes. The Company is not aware of any events of default, current events or market conditions that would allow holders to call or convert the Notes as of September 30, 2018.

The cash conversion feature of the Notes required bifurcation from the Notes and was initially accounted for as an equity instrument classified to stockholders’ equity, as the conversion feature was determined to be clearly and closely related to the Company’s stock. Based on market data available for publicly traded, senior, unsecured corporate bonds issued by companies in the same industry and asset base and with similar maturity, the Company estimated the implied interest rate, assuming no conversion option. Assumptions used in the estimate represent what market participants would use in pricing the liability component, including market interest rates, credit standing, and yield curves, all of which are defined as Level 2 observable inputs. The estimated implied interest rate was applied to the Notes, which resulted in a fair value of the liability component of $96,289,000 upon issuance, calculated as the present value of implied future payments based on the $115 million aggregate principal amount. The equity component of the Notes was recognized as a debt discount, recorded in additional paid-in capital, and represents the difference between the aggregate principal of the Notes and the fair value of the Notes without conversion option on their issuance date. The debt discount is amortized to interest expense using the effective interest method over five years, or the life of the Notes. The Company assesses the equity classification of the cash conversion feature quarterly, and it is not re-measured as long as it continues to meet the conditions for equity classification.

Interest expense recognized on the Notes during the three-month period ended September 30, 2018 includes $611,000, $911,000 and $160,000 for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. Interest expense recognized on the Notes during the nine-month period ended September 30, 2018 includes $1,833,000, $2,687,000 and $473,000 for the contractual coupon interest, the accretion of the debt discount and the amortization of the debt issuance costs, respectively. The effective interest rate on the Notes is 6.6%, which includes the interest on the Notes, amortization of the debt discount and debt issuance costs. As of September 30, 2018, the carrying value of the Notes was approximately $102.4 million and the fair value of the principal was approximately $202.4 million. The fair value of the Notes was determined based on the most recent trade activity of the Notes as of September 30, 2018.

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Stock-Based Compensation

9 Months Ended

Sep. 30, 2018

Stock-Based Compensation

11. Stock-Based Compensation

For the three-month periods ended September 30, 2018 and 2017, the Company recorded stock-based compensation expense of approximately $2,779,000 and $1,817,000, respectively, for share-based awards granted under the Second Amended and Restated 2001 Repligen Corporation Stock Plan (the “2001 Plan”), the Repligen Corporation Amended and Restated 2012 Stock Option and Incentive Plan (the “2012 Plan,”), and the Repligen Corporation 2018 Stock Option and Incentive Plan (the “2018 Plan,” and together with the 2001 Plan and the 2012 Plan, the “Plans”). The Company recorded stock-based compensation expense of approximately $7,672,000 and $4,845,000 for the nine-month periods ended September 30, 2018 and 2017, respectively, for share-based awards granted under the Plans.

The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of product revenue	$	277	$	197	$	777	$	491
Research and development		253		127		650		338
Selling, general and administrative		2,249		1,493		6,245		4,016
Total	$	2,779	$	1,817	$	7,672	$	4,845

The 2018 Plan allows for the granting of incentive and nonqualified options to purchase shares of common stock, restricted stock units (“RSUs”) and other equity awards. Employee grants under the Plans generally vest over a three- to five-year period, with 20%-33% vesting on the first anniversary of the date of grant and the remainder vesting in equal yearly installments thereafter. Nonqualified options and RSUs issued to non-employee directors under the Plans generally vest over one year. In the first quarter of 2018, to create a longer-term retention incentive, the Company’s Compensation Committee granted long-term incentive compensation awards to its Chief Executive Officer consisting of both stock options and RSUs that are subject to time-based vesting over nine years. Options granted under the Plans have a maximum term of ten years from the date of grant and generally, the exercise price of the stock options equals the fair market value of the Company’s common stock on the date of grant. At September 30, 2018, options to purchase 1,033,312 shares and 707,716 RSUs were outstanding under the Plans. At September 30, 2018, 2,906,351 shares were available for future grant under the 2018 Plan.

The Company uses the Black-Scholes option pricing model to calculate the fair value of stock option awards on the grant date, and the Company uses the value of the common stock as of the grant date to value RSUs. The Company measures stock-based compensation cost at the grant date based on the estimated fair value of the award. The Company recognizes expense on awards with service based vesting over the employee’s requisite service period on a straight-line basis. In the third quarter of 2017, the Company issued performance stock units to certain employees related to the Spectrum Acquisition which are tied to the achievement of certain revenue and gross margin metrics and the passage of time. Additionally, in the first quarter of 2018, the Company issued performance stock units to certain individuals which are tied to the achievement of certain 2018 revenue metrics and the passage of time. The Company recognizes expense on performance based awards over the vesting period based on the probability that the performance metrics will be achieved. The Company recognizes stock-based compensation expense for options that are ultimately expected to vest, and accordingly, such compensation expense has been adjusted for estimated forfeitures.

Information regarding option activity for the nine-month period ended September 30, 2018 under the Plans is summarized below:

	Options Outstanding			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Options outstanding at December 31, 2017		734,940		$	20.80
Granted		439,678			34.79
Exercised		(131,718	)		18.02
Forfeited/cancelled		(9,588	)		29.71
Options outstanding at September 30, 2018		1,033,312		$	26.99		7.38	$	29,421
Options exercisable at September 30, 2018		444,446		$	18.73		5.29	$	16,325
Vested and expected to vest at September 30, 2018 (1)		986,509		$	26.64		7.29	$	28,429

(1) Represents the number of vested options as of September 30, 2018 plus the number of unvested options expected to vest as of September 30, 2018 based on the unvested outstanding options at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (the difference between the closing price of the common stock on September 28, 2018, the last trading day of the nine-month period ended September 30, 2018, of $55.46 per share and the exercise price of each in-the-money option) that would have been received by the option holders had all option holders exercised their options on September 30, 2018.

The weighted average grant date fair value of options granted during the nine-month periods ended September 30, 2018 and 2017 was $18.56 and $16.94, respectively. The total fair value of stock options that vested during the nine-month periods ended September 30, 2018 and 2017 was approximately $2,113,000 and $2,074,000, respectively.

Information regarding RSU and performance stock unit activity for the nine-month period ended September 30, 2018 under the Plans is summarized below:

	Units Outstanding			Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Restricted and performance stock units outstanding at December 31, 2017		505,235
Granted		385,461
Vested		(134,590	)
Forfeited/cancelled		(48,390	)
Restricted stock units outstanding at September 30, 2018		707,716			3.94	$	39,250
Vested and expected to vest at September 30, 2018 (1)		649,985			3.43	$	36,048

(1) Represents the number of unvested RSUs expected to vest as of September 30, 2018 based on the unvested outstanding RSUs at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

The aggregate intrinsic value in the table above represents the total pre-tax intrinsic value (equal to the closing price of the common stock on September 28, 2018, the last trading day of the nine-month period ended September 30, 2018, of $55.46 per share) that would have been received by the RSU holders had all RSUs vested on September 28, 2018. The aggregate intrinsic value of RSUs vested during the nine-month periods ended September 30, 2018 and 2017 was approximately $5,165,000 and $3,480,000, respectively.

The weighted average grant date fair value of RSUs granted during the nine-month periods ended September 30, 2018 and 2017 was $35.13 and $36.85, respectively. The total grant date fair value of RSUs that vested during the nine-month periods ended September 30, 2018 and 2017 was approximately $4,065,000 and $2,565,000, respectively.

As of September 30, 2018, there was $28,360,000 of total unrecognized compensation cost related to unvested share-based awards. This cost is expected to be recognized over a weighted average remaining requisite service period of 4.51 years.

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Income Taxes

9 Months Ended

Sep. 30, 2018

Income Taxes

12. Income Taxes

The Company’s effective tax rate for the three- and nine-month periods ended September 30, 2018 was 27.6% and 24.6%, respectively, compared to 330.9% and (183.8%), respectively, for the corresponding periods in the prior year. The effective tax rate for the three- and nine-month periods ended September 30, 2018 was higher than the U.S. statutory rate of 21% due to state tax effects and the impact of the Global Intangible Low-Taxed Income (“GILTI”) tax enacted as part of the Act enacted in December 2017. For the three- and nine-month periods ended September 30, 2017, the effective tax rate was lower than the U.S. statutory tax rate of 34% primarily due to the sale of intellectual property from Repligen Corporation to Repligen Sweden AB. The Company utilized certain of its U.S. deferred tax assets as a result of this sale and reduced its valuation allowance on these deferred tax assets by approximately $9,200,000 in the second quarter of 2017. The Company recorded a tax benefit of $5,625,000 on the Company’s consolidated statements of comprehensive income as a result of the sale of the intellectual property.

ASU 2016-16,“Intra-Entity Transfers of Assets Other Than Inventory,” requires the income tax consequences of intra-entity transfers of assets other than inventory to be recognized when the intra-entity transfer occurs rather than deferring recognition of income tax consequences until the transfer was made with an outside party. The Company adopted the provisions of this ASU in the first quarter of 2018. The adoption resulted in a decrease of $5,609,000 to other assets, a decrease of $4,932,000 to deferred tax liabilities and a decrease of $677,000 to accumulated deficit at January 1, 2018.

At December 31, 2017, the Company had net operating loss carryforwards of approximately $19,652,000 in the U.S., net operating loss carryforwards of approximately €603,000 (approximately $743,000) in Germany, federal business tax credit carryforwards of $297,000 and state business tax credit carryforwards of approximately $99,000 available to reduce future domestic income taxes, if any. The net operating loss and business tax credits carryforwards will continue to expire at various dates through December 2037. The net operating loss and business tax credit carryforwards are subject to review and possible adjustment by the Internal Revenue Service. While an IRC Section 382 study was completed in the second quarter of 2017, and no current limitations were identified, use of these net operating loss and business tax credit carryforwards may be limited in the future based on certain changes in the ownership interest of significant stockholders.

On December 22, 2017, the Act was signed into law. The Act made significant changes to federal tax law, including, but not limited to, a reduction in the federal income tax rate from 35% to 21%, taxation of certain global intangible low-taxed income, allowing for immediate expensing of qualified assets, stricter limits on deductions for interest and certain executive compensation, and a one-time transition tax on previously deferred earnings of certain foreign subsidiaries. Due to the complexities involved in accounting for the enactment of the Act, the SEC issued Staff Accounting Bulletin No. (“SAB”) 118, which allows a registrant to record provisional amounts during a measurement period not to extend beyond one year of the enactment date. Under the SAB 118 guidance, the Company has determined that although its accounting for the effect of certain provisions of the Act is incomplete, it is able to make reasonable estimates for certain effects of tax reform and therefore have recorded provisional amounts.

The Act lowered the Company’s U.S. statutory federal tax rate from 35% to 21% effective January 1, 2018. The Company recorded a tax benefit of $12,812,000 in the year ended December 31, 2017 for the reduction in its US deferred tax assets and liabilities resulting from the rate change.

The Company is subject to a territorial tax system under the Act, in which the Company is required to provide for tax on GILTI earned by certain foreign subsidiaries. Additionally, the Company is required to make an accounting policy election to either recognize deferred taxes for temporary basis differences expected to reverse as GILTI in future years or provide for the tax expense related to GILTI in the year the tax is incurred as a period expense. As of September 30, 2018, the Company is still evaluating the effects of the GILTI provisions as guidance and interpretations continue to emerge. Therefore, the Company has not determined its accounting policy on the GILTI provisions. However, the standard requires that the Company reflects the impact of the GILTI provisions as a period expense until the accounting policy is finalized. Therefore, the Company has included the provisional estimate of GILTI related to current-year operations in its estimated annual effective tax rate only and will be updating the impact and accounting policy as the analysis related to the GILTI provisions is completed.

The Act also includes a one-time deemed repatriation transition tax whereby entities that are shareholders of a specified foreign corporation must include in gross income the undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation. The provisional amount recorded at December 31, 2017 increased the Company’s tax provision by $3,266,000. This amount may change as the Company refines its calculations of post-1986 earnings and profits for our foreign subsidiaries, as well as the amounts held in cash.

The Company anticipates that future guidance and interpretations with respect to the Act will cause the Company to further adjust its provisional amounts recorded as of December 31, 2017. No further adjustments have been made to these provisional amounts in 2018. Any measurement period adjustments will be reported as a component of provision for income taxes in the reporting period the amounts are determined. The final accounting will be completed no later than one year from the enactment of the Act.

The Company’s tax returns are subject to examination by federal, state and international tax authorities for the following periods:

Jurisdiction	Fiscal Years Subject to Examination
United States – federal and state	2015-2017
Sweden	2011-2017
Germany	2017
Netherlands	2012-2017

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Fair Value Measurement

9 Months Ended

Sep. 30, 2018

Fair Value Measurement

13. Fair Value Measurement

In determining the fair value of its assets and liabilities, the Company uses various valuation approaches. The Company employs a hierarchy for inputs used in measuring fair value that maximizes the use of observable inputs and minimizes the use of unobservable inputs by requiring that observable inputs be used when available. Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset or liability and are developed based on the best information available in the circumstances. The fair value hierarchy is broken down into three levels based on the source of inputs as follows:

Level 1  –	Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access
Level 2  –	Valuations based on quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active and models for which all significant inputs are observable, either directly or indirectly
Level 3  –	Valuations based on inputs that are unobservable and significant to the overall fair value measurement

The availability of observable inputs can vary among the various types of financial assets and liabilities. To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. In certain cases, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, for financial statement disclosure purposes, the level in the fair value hierarchy within which the fair value measurement is categorized is based on the lowest level input that is significant to the overall fair value measurement.

The Company’s fixed income investments have historically comprised of obligations of U.S. government agencies and corporate marketable securities. These investments have been initially valued at the transaction price and subsequently valued, at the end of each reporting period, utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation models, including both income and market based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events. At least annually, the Company validates applicable prices provided by third party pricing services by reviewing their pricing methods and matrices, obtaining market values from other pricing sources, analyzing pricing data in certain instances and confirming that the relevant markets are active.

As of September 30, 2018 and December 31, 2017, the Company had no assets or liabilities for which fair value measurement is either required or has been elected to be applied.

In May 2016, the Company issued $115.0 million aggregate principal amount of the Notes due June 1, 2021. Interest is payable semi-annually in arrears on June 1 and December 1 of each year, beginning December 1, 2016. As of September 30, 2018, the carrying value of the Notes was approximately $102.4 million, net of unamortized discount, and the fair value of the Notes was approximately $202.4 million. The fair value of the Notes was determined based on the most recent trade activity of the Notes as of September 30, 2018. These valuations are Level 1 valuations, as the valuations are based on unadjusted quoted prices in active markets that the Company has the ability to access. The Notes are discussed in more detail in Note 10, “Convertible Senior Notes.”

There were no re-measurements to fair value during the nine-month period ended September 30, 2018 of financial assets and liabilities that are not measured at fair value on a recurring basis.

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Commitments and Contingencies

9 Months Ended

Sep. 30, 2018

Commitments and Contingencies

14. Commitments and Contingencies

The Company leases its headquarters in Waltham, Massachusetts as well as certain of its office and manufacturing space around the world.

In February 2018, the Company entered into an agreement to lease 63,761 square feet of office and manufacturing space in Marlborough, Massachusetts from U.S. REIF 111 Locke Drive Massachusetts, LLC (the “Premises”).

The term of the lease commenced on June 1, 2018 (the “Commencement Date”) and shall continue for a period of 126 consecutive months, unless earlier terminated in accordance with the terms of the lease (the “Lease Term”). Under the lease, the Company has the option to extend the Lease Term for two additional five-year periods.

Fixed rent with respect to 40,000 square feet of the Premises commenced on the Commencement Date, and rent for the full 63,761 square feet of the Premises shall begin 19 months following the Commencement Date. Under the terms of the lease, the Company has provided a letter of credit of approximately $163,000 as a security deposit and is required to pay its pro rata share of any building operating expenses and real estate taxes.

Future minimum rental commitments under the Company’s leases as of September 30, 2018 are as follows (amounts in thousands):

	Minimum Rental Commitments
2018 (three months remaining)	$	893
2019		3,425
2020		3,266
2021		2,957
2022		2,049
Thereafter		4,872

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Related Party Transactions

9 Months Ended

Sep. 30, 2018

Related Party Transactions

15. Related Party Transactions

Certain facilities leased by Spectrum are owned by the former owner of Spectrum, who currently holds greater than 10% of the Company’s outstanding common stock. The lease amounts paid to this shareholder were negotiated in connection with the Spectrum Acquisition. The Company has incurred rent expense totaling $555,000 for the nine-month period ended September 30, 2018 related to these leases.

As part of the Spectrum Acquisition, the Company is responsible for filing all tax returns for Spectrum for the period from January 1, 2017 through July 31, 2017, the day before the Spectrum Acquisition. The Company is responsible for collecting any tax refunds from federal and state authorities and remitting these refunds to the former shareholders of Spectrum, including the former owner of Spectrum who currently holds greater than 10% of the Company’s outstanding common stock. As of September 30, 2018, the Company has accrued $1,728,000 of these refunds payable to the Spectrum shareholders, net of $207,000 of expenses paid by the Company on behalf of Spectrum for tax preparation and other fees. These amounts are included in accrued liabilities on the Company’s consolidated balance sheet.

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Segment Reporting

9 Months Ended

Sep. 30, 2018

Segment Reporting

16. Segment Reporting

The Company views its operations, makes decisions regarding how to allocate resources and manages its business as one operating segment. As a result, the financial information disclosed herein represents all of the material financial information related to the Company’s sole operating segment.

The following table represents the Company’s total revenue by geographic area (based on the location of the customer):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
North America		49	%		45	%		47	%		40	%
Europe		39	%		45	%		41	%		50	%
Asia and Australia		12	%		10	%		12	%		10	%
Other		0	%		0	%		0	%		0	%
Total		100	%		100	%		100	%		100	%

Revenue from significant customers as a percentage of the Company’s total revenue is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
MilliporeSigma		18	%		14	%		17	%		18	%
GE Healthcare		16	%		17	%		16	%		24	%

Significant accounts receivable balances as a percentage of the Company’s total trade accounts receivable are as follows:

	September 30, 2018			December 31, 2017
GE Healthcare		21	%		11	%
MilliporeSigma		14	%		19	%

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Acquisition of Spectrum LifeSciences, LLC (Tables) - Spectrum Inc.

9 Months Ended

Sep. 30, 2018

Consideration Transferred

The total consideration transferred follows (amounts in thousands):

Cash consideration	$	122,932
Equity consideration		247,575
Working capital adjustment		425
Net assets acquired	$	370,932

Components and Allocation of Purchase Price

The components and allocation of the purchase price consists of the following amounts (amounts in thousands):

Cash and cash equivalents	$	10,137
Accounts receivable		5,075
Inventory		13,502
Prepaid expenses and other assets		616
Fixed assets		6,004
Deferred tax assets		1,102
Customer relationships		78,400

Developed technology		38,560
Trademark and tradename		2,160
Non-competition agreements		960
Goodwill		265,722
Accounts payable		(1,335	)
Unrecognized tax benefit		(576	)
Accrued liabilities		(5,787	)
Deferred tax liabilities		(43,608	)
Fair value of net assets acquired	$	370,932

Unaudited Supplemental Pro Forma Information

The following table presents unaudited supplemental pro forma information as if the Spectrum Acquisition had occurred as of January 1, 2016 (amounts in thousands, except per share data):

	Pro-forma Nine Months Ended September 30, 2017
Total revenue		121,301
Net income		14,994
Earnings per share:
Basic	$	0.36
Diluted	$	0.36

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Revenue Recognition (Tables)

9 Months Ended

Sep. 30, 2018

Disaggregation of Revenue

Revenues for the three- and nine-month periods ended September 30, 2018 and 2017 were as follows (amounts in thousands, except percentages):

	Three Months Ended September 30,												Nine Months Ended September 30,
	2018		2017		$ Change			% Change			2018		2017		$ Change			% Change
Product revenue	$	49,500	$	36,514	$	12,986			35.6	%	$	142,042	$	99,516	$	42,526			42.7	%
Royalty and other revenue		29		66		(37	)		(56.1	%)		48		108		(60	)		(55.6	%)
Total revenues	$	49,529	$	36,580	$	12,949			35.4	%	$	142,090	$	99,624	$	42,466			42.6	%

Disaggregation of Revenue from Contracts with Customers by Geographic Region

The following tables disaggregate the Company’s revenue from contracts with customers by geographic region (amounts in thousands).

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
North America	$	24,064	$	16,428	$	66,575	$	40,203
Europe		19,328		16,374		58,497		49,322
Asia and Australia		6,075		3,630		16,731		9,949
Other		62		148		287		150
Total	$	49,529	$	36,580	$	142,090	$	99,624

Revenue from Significant Customers

Revenue from significant customers is as follows (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
MilliporeSigma	$	8,791	$	5,191	$	24,181	$	17,727
GE Healthcare	$	7,743	$	6,254	$	22,253	$	24,285

Summary of Receivables and Deferred Revenue from Contracts with Customers

The following table provides information about receivables and deferred revenue from contracts with customers as of September 30, 2018 (amounts in thousands):

	2018
Balances from contracts with customers only:
Accounts receivable	$	30,784
Deferred revenue		1,234
Revenue recognized in the three-month period relating to:
The beginning deferred revenue balance	$	441
Changes in pricing related to products or services satisfied in previous periods		—

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Accumulated Other Comprehensive Income (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Changes in Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive income by component (amounts in thousands):

	Foreign Currency Translation Gain/ (Loss)
Balance at December 31, 2017	$	(6,363	)
Foreign currency translation loss	$	(5,410	)
Balance at September 30, 2018	$	(11,773	)

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Earnings Per Share (Tables)

9 Months Ended

Sep. 30, 2018

Basic and Diluted Weighted Average Shares Outstanding

Basic and diluted weighted average shares outstanding were as follows:

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Weighted average common shares		43,822,472		41,236,554		43,728,503		36,435,591
Dilutive common stock options and restricted stock units		651,265		484,242		511,433		454,340
Dilutive effect of convertible senior notes		1,354,438		842,206		892,179		496,402
Weighted average common shares, assuming dilution		45,828,175		42,563,002		45,132,115		37,386,333

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Inventories (Tables)

9 Months Ended

Sep. 30, 2018

Schedule of Inventories

Inventories consist of the following (amounts in thousands):

	September 30, 2018		December 31, 2017
Raw Materials	$	24,349	$	21,678
Work-in-process		6,278		4,756
Finished products		11,657		12,570
Total	$	42,284	$	39,004

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Property, Plant and Equipment (Tables)

9 Months Ended

Sep. 30, 2018

Property, Plant and Equipment

Property, plant and equipment consist of the following (amounts in thousands):

	September 30, 2018			December 31, 2017
Land	$	1,023		$	1,023
Buildings		764			764
Leasehold improvements		15,940			15,673
Equipment		23,405			21,904
Furniture and fixtures		5,156			4,272
Construction in progress		10,086			2,581
Total property, plant and equipment		56,374			46,217
Less: accumulated depreciation		(27,015	)		(23,800	)
Property, plant and equipment, net	$	29,359		$	22,417

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Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2018

Intangible assets

Intangible assets consisted of the following at September 30, 2018 (amounts in thousands):

	Gross Carrying Amount		Accumulated Amortization			Weighted Average Useful Life (in years)
Technology – developed	$	51,689	$	(5,221	)		19
Patents		240		(240	)		8
Customer relationships		101,563		(14,821	)		14
Trademark – definite lived		2,160		(131	)		20
Trademark – indefinite lived		700		—			—
Other intangibles		1,061		(466	)		3
Total intangible assets	$	157,413	$	(20,879	)		16

Intangible assets consisted of the following at December 31, 2017 (amounts in thousands):

	Gross Carrying Amount		Accumulated Amortization			Weighted Average Useful Life (in years)
Technology – developed	$	51,801	$	(3,201	)		19
Patents		240		(238	)		8
Customer relationships		102,120		(9,636	)		14
Trademarks – definite lived		2,160		(47	)		20
Trademarks – indefinite lived		700		—			—
Other intangibles		1,063		(209	)		3
Total intangible assets	$	158,084	$	(13,331	)		16

Schedule of Amortization Expense for Amortized Intangible Assets

As of September 30, 2018, the Company expects to record amortization expense as follows (amounts in thousands):

Years Ending	Amortization Expense
December 31, 2018 (three months remaining)	$	2,636
December 31, 2019		10,433
December 31, 2020		9,854
December 31, 2021		9,363
December 31, 2022		9,361

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Accrued Liabilities (Tables)

9 Months Ended

Sep. 30, 2018

Accrued Liabilities

Accrued liabilities consist of the following (amounts in thousands):

	September 30, 2018		December 31, 2017
Employee compensation	$	7,986	$	9,560
Taxes		2,719		1,668
Related party payable		1,728		—
Royalty and license fees		1,065		1,383
Accrued purchases		261		1,191
Warranties		605		598
Professional fees		563		947
Deferred revenue		1,234		960
Other accrued expenses		1,803		1,622
Total	$	17,964	$	17,929

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Convertible Senior Notes (Tables)

9 Months Ended

Sep. 30, 2018

Carrying Value of Convertible Senior Notes

The carrying value of the Notes is as follows (amounts in thousands):

	September 30, 2018			December 31, 2017
2.125% Convertible Senior Notes due 2021:
Principal amount	$	114,989		$	115,000
Unamortized debt discount		(10,706	)		(13,395	)
Unamortized debt issuance costs		(1,883	)		(2,355	)
Total Convertible Senior Notes	$	102,400		$	99,250
Less: Current portion		(102,400	)		—
Total Convertible Senior Notes, long-term	$	—		$	99,250

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Stock-Based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Stock-Based Compensation Expense

The following table presents stock-based compensation expense included in the Company’s consolidated statements of comprehensive income (amounts in thousands):

	Three Months Ended September 30,				Nine Months Ended September 30,
	2018		2017		2018		2017
Cost of product revenue	$	277	$	197	$	777	$	491
Research and development		253		127		650		338
Selling, general and administrative		2,249		1,493		6,245		4,016
Total	$	2,779	$	1,817	$	7,672	$	4,845

Summary of Option Activity

Information regarding option activity for the nine-month period ended September 30, 2018 under the Plans is summarized below:

	Options Outstanding			Weighted- Average Exercise Price Per Share		Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Options outstanding at December 31, 2017		734,940		$	20.80
Granted		439,678			34.79
Exercised		(131,718	)		18.02
Forfeited/cancelled		(9,588	)		29.71
Options outstanding at September 30, 2018		1,033,312		$	26.99		7.38	$	29,421
Options exercisable at September 30, 2018		444,446		$	18.73		5.29	$	16,325
Vested and expected to vest at September 30, 2018 (1)		986,509		$	26.64		7.29	$	28,429

(1) Represents the number of vested options as of September 30, 2018 plus the number of unvested options expected to vest as of September 30, 2018 based on the unvested outstanding options at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

RSU and Performance Stock Units

Summary of RSU and Performance Stock Unit Activity

Information regarding RSU and performance stock unit activity for the nine-month period ended September 30, 2018 under the Plans is summarized below:

	Units Outstanding			Weighted- Average Remaining Contractual Term (in years)		(in thousands) Aggregate Intrinsic Value
Restricted and performance stock units outstanding at December 31, 2017		505,235
Granted		385,461
Vested		(134,590	)
Forfeited/cancelled		(48,390	)
Restricted stock units outstanding at September 30, 2018		707,716			3.94	$	39,250
Vested and expected to vest at September 30, 2018 (1)		649,985			3.43	$	36,048

(1) Represents the number of unvested RSUs expected to vest as of September 30, 2018 based on the unvested outstanding RSUs at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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Income Taxes (Tables)

9 Months Ended

Sep. 30, 2018

Summary of Tax Returns Periods Subject to Examination by Federal, State and International Tax Authorities

The Company’s tax returns are subject to examination by federal, state and international tax authorities for the following periods:

Jurisdiction	Fiscal Years Subject to Examination
United States – federal and state	2015-2017
Sweden	2011-2017
Germany	2017
Netherlands	2012-2017

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Commitments and Contingencies (Tables)

9 Months Ended

Sep. 30, 2018

Future Minimum Rental Commitments under Company's Leases

Future minimum rental commitments under the Company’s leases as of September 30, 2018 are as follows (amounts in thousands):

	Minimum Rental Commitments
2018 (three months remaining)	$	893
2019		3,425
2020		3,266
2021		2,957
2022		2,049
Thereafter		4,872

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Segment Reporting (Tables)

9 Months Ended

Sep. 30, 2018

Percentage of Revenue from Significant Customers

Revenue from significant customers as a percentage of the Company’s total revenue is as follows:

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
MilliporeSigma		18	%		14	%		17	%		18	%
GE Healthcare		16	%		17	%		16	%		24	%

Total Revenue

Percentage by Geographic Area or Significant Customers

The following table represents the Company’s total revenue by geographic area (based on the location of the customer):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2018			2017			2018			2017
North America		49	%		45	%		47	%		40	%
Europe		39	%		45	%		41	%		50	%
Asia and Australia		12	%		10	%		12	%		10	%
Other		0	%		0	%		0	%		0	%
Total		100	%		100	%		100	%		100	%

Accounts Receivable

Percentage by Geographic Area or Significant Customers

Significant accounts receivable balances as a percentage of the Company’s total trade accounts receivable are as follows:

	September 30, 2018			December 31, 2017
GE Healthcare		21	%		11	%
MilliporeSigma		14	%		19	%

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Basis of Presentation - Additional Information (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
ASU No. 2016-18 | Cash, Cash Equivalents and Restricted Cash
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
New accounting pronouncement, cumulative effect of change on cash, cash equivalents and restricted cash	$ 450	$ 450

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Acquisition of Spectrum LifeSciences, LLC - Additional Information (Detail) - USD ($)		3 Months Ended	5 Months Ended	9 Months Ended	12 Months Ended
	Aug. 01, 2017	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2018	Dec. 31, 2017
Business Acquisition [Line Items]
Finite lived intangible asset, useful life				16 years	16 years
Goodwill		$ 326,977,000	$ 327,333,000	$ 326,977,000	$ 327,333,000
Customer relationships
Business Acquisition [Line Items]
Finite lived intangible asset, useful life				14 years	14 years
Technology - developed
Business Acquisition [Line Items]
Finite lived intangible asset, useful life				19 years	19 years
Spectrum Inc.
Business Acquisition [Line Items]
Cash payment to acquire business	$ 122,932,000
Shares issued for business acquisition	6,153,995
Value of common stock issued	$ 247,575,000
Working capital adjustment	425,000
Purchase price business acquisition	370,932,000
Fair value of net assets acquired	370,932,000
Goodwill	265,722,000
Goodwill expected to be deductible for tax purposes amount	0
Business acquisition, revenue		$ 13,188,000	$ 19,394,000	$ 37,220,000
Spectrum Inc. | Customer relationships
Business Acquisition [Line Items]
Fair value of acquired finite lived intangible assets	$ 78,400,000
Finite lived intangible asset, useful life	15 years
Spectrum Inc. | Technology - developed
Business Acquisition [Line Items]
Fair value of acquired finite lived intangible assets	$ 38,560,000
Finite lived intangible asset, useful life	20 years
Spectrum Inc. | Non-competition agreements
Business Acquisition [Line Items]
Fair value of acquired finite lived intangible assets	$ 960,000
Finite lived intangible asset, useful life	3 years
Spectrum Inc. | Trademark and Tradename
Business Acquisition [Line Items]
Fair value of acquired finite lived intangible assets	$ 2,160,000
Spectrum Inc. | Selling, general and administrative
Business Acquisition [Line Items]
Business combination, acquisition and integration related costs				$ 2,313,000	$ 7,060,000

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Consideration Transferred (Detail) - Spectrum Inc. $ in Thousands	Aug. 01, 2017 USD ($)
Business Acquisition [Line Items]
Cash consideration	$ 122,932
Equity consideration	247,575
Working capital adjustment	425
Total consideration transferred	$ 370,932

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Components and Allocation of Purchase Price (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017	Aug. 01, 2017
Business Acquisition [Line Items]
Goodwill	$ 326,977	$ 327,333
Spectrum Inc.
Business Acquisition [Line Items]
Cash and cash equivalents			$ 10,137
Accounts receivable			5,075
Inventory			13,502
Prepaid expenses and other assets			616
Fixed assets			6,004
Deferred tax assets			1,102
Goodwill			265,722
Accounts payable			(1,335)
Unrecognized tax benefit			(576)
Accrued liabilities			(5,787)
Deferred tax liabilities			(43,608)
Net assets acquired			370,932
Spectrum Inc. | Customer relationships
Business Acquisition [Line Items]
Business combination, intangible assets			78,400
Spectrum Inc. | Technology - developed
Business Acquisition [Line Items]
Business combination, intangible assets			38,560
Spectrum Inc. | Trademark and Tradename
Business Acquisition [Line Items]
Business combination, intangible assets			2,160
Spectrum Inc. | Non-competition agreements
Business Acquisition [Line Items]
Business combination, intangible assets			$ 960

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Unaudited Supplemental Pro Forma Information (Detail) - Spectrum Inc. $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2017 USD ($) $ / shares
Business Acquisition [Line Items]
Total revenue | $	$ 121,301
Net income | $	$ 14,994
Earnings per share:
Basic | $ / shares	$ 0.36
Diluted | $ / shares	$ 0.36

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Summary of Disaggregation of Product Revenues from Contracts with Customers by Major Product Line (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenue	$ 49,529	$ 36,580	$ 142,090	$ 99,624
Product revenue, percentage change amount	12,986		42,526
Royalty and other revenue, percentage change amount	(37)		(60)
Total revenue, percentage change amount	$ 12,949		$ 42,466
Product revenue, percentage change	35.60%		42.70%
Royalty and other revenue, percentage change	(56.10%)		(55.60%)
Total revenue, percentage change	35.40%		42.60%
Product Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 49,500	36,514	$ 142,042	99,516
Royalty and Other Revenue
Disaggregation of Revenue [Line Items]
Revenue	$ 29	$ 66	$ 48	$ 108

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Revenue from Contracts with Customers by Geographic Region (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Concentration Risk [Line Items]
Revenue	$ 49,529	$ 36,580	$ 142,090	$ 99,624
North America
Concentration Risk [Line Items]
Revenue	24,064	16,428	66,575	40,203
Europe
Concentration Risk [Line Items]
Revenue	19,328	16,374	58,497	49,322
Asia and Australia
Concentration Risk [Line Items]
Revenue	6,075	3,630	16,731	9,949
Other
Concentration Risk [Line Items]
Revenue	$ 62	$ 148	$ 287	$ 150

XML

Revenue from Significant Customers (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Concentration Risk [Line Items]
Revenue	$ 49,529	$ 36,580	$ 142,090	$ 99,624
MilliporeSigma
Concentration Risk [Line Items]
Revenue	8,791	5,191	24,181	17,727
GE Healthcare
Concentration Risk [Line Items]
Revenue	$ 7,743	$ 6,254	$ 22,253	$ 24,285

XML

Summary of Receivables and Deferred Revenue from Contracts with Customers (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Balances from contracts with customers only:
Accounts receivable	$ 30,784	$ 27,585
Deferred revenue	1,234
Revenue recognized in the three-month period relating to:
The beginning deferred revenue balance	441
Changes in pricing related to products or services satisfied in previous periods	$ 0

XML

Revenue Recognition - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Other Revenues [Line Items]
Impairment losses on receivables	$ 0	$ 0

XML

Change in Accumulated Other Comprehensive Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			$ 591,548
Foreign currency translation gain (loss)	$ (630)	$ 2,025	(5,410)	$ 7,097
Ending Balance	606,487		606,487
Foreign Currency Translation Gain/(Loss)
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance			(6,363)
Foreign currency translation gain (loss)			(5,410)
Ending Balance	$ (11,773)		$ (11,773)

XML

Earnings Per Share - Additional Information (Detail) - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017	May 24, 2016
Computation of Earnings Per Share [Line Items]
Participating securities outstanding	0	0	0	0
Stock options, outstanding	1,033,312		1,033,312		734,940
Stock options, weighted average exercise price	$ 26.99		$ 26.99		$ 20.80
Common stock excluded from calculation of diluted earnings per share	329,409	162,544	485,520	326,572
2.125% Convertible Senior Notes due 2021
Computation of Earnings Per Share [Line Items]
Notes, interest rate	2.125%		2.125%			2.125%
Notes, due date			Jun. 01, 2021
Option To Purchase Common Stock
Computation of Earnings Per Share [Line Items]
Stock options, outstanding	1,033,312	749,669	1,033,312	749,669
Stock options, weighted average exercise price	$ 26.99	$ 20.84	$ 26.99	$ 20.84
Restricted Stock Units (RSUs)
Computation of Earnings Per Share [Line Items]
Common stock excluded from calculation of diluted earnings per share			707,716	515,468

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Basic and Diluted Weighted Average Shares Outstanding (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Weighted Average Number of Shares Outstanding [Line Items]
Weighted average common shares	43,822,472	41,236,554	43,728,503	36,435,591
Dilutive common stock options and restricted stock units	651,265	484,242	511,433	454,340
Dilutive effect of convertible senior notes	1,354,438	842,206	892,179	496,402
Weighted average common shares, assuming dilution	45,828,175	42,563,002	45,132,115	37,386,333

XML

Schedule of Inventories (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Inventory [Line Items]
Raw materials	$ 24,349	$ 21,678
Work-in-process	6,278	4,756
Finished products	11,657	12,570
Total	$ 42,284	$ 39,004

XML

Property, Plant and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property, Plant and Equipment [Line Items]
Land	$ 1,023	$ 1,023
Buildings	764	764
Leasehold improvements	15,940	15,673
Equipment	23,405	21,904
Furniture and fixtures	5,156	4,272
Construction in progress	10,086	2,581
Total property, plant and equipment	56,374	46,217
Less: accumulated depreciation	(27,015)	(23,800)
Property, plant and equipment, net	$ 29,359	$ 22,417

XML

Property, Plant and Equipment - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Property, Plant and Equipment [Line Items]
Depreciation expense of property and equipment	$ 3,871	$ 2,988

XML

Intangible Assets (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
Intangible Assets [Line Items]
Gross Carrying Amount	$ 157,413	$ 158,084
Accumulated Amortization	$ (20,879)	$ (13,331)
Weighted Average Useful Life (in years)	16 years	16 years
Trademark
Intangible Assets [Line Items]
Gross Carrying Amount, indefinite lived intangible assets	$ 700	$ 700
Technology - developed
Intangible Assets [Line Items]
Gross Carrying Amount	51,689	51,801
Accumulated Amortization	$ (5,221)	$ (3,201)
Weighted Average Useful Life (in years)	19 years	19 years
Patents
Intangible Assets [Line Items]
Gross Carrying Amount	$ 240	$ 240
Accumulated Amortization	$ (240)	$ (238)
Weighted Average Useful Life (in years)	8 years	8 years
Customer relationships
Intangible Assets [Line Items]
Gross Carrying Amount	$ 101,563	$ 102,120
Accumulated Amortization	$ (14,821)	$ (9,636)
Weighted Average Useful Life (in years)	14 years	14 years
Other intangibles
Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,061	$ 1,063
Accumulated Amortization	$ (466)	$ (209)
Weighted Average Useful Life (in years)	3 years	3 years
Trademark
Intangible Assets [Line Items]
Gross Carrying Amount	$ 2,160	$ 2,160
Accumulated Amortization	$ (131)	$ (47)
Weighted Average Useful Life (in years)	20 years	20 years

XML

Intangible Assets - Additional Information (Detail) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017
Finite-Lived Intangible Assets [Line Items]
Amortization expense	$ 7,906	$ 3,476

XML

Amortization Expense for Amortized Intangible Assets (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Finite-Lived Intangible Assets [Line Items]
Amortization Expense, December 31, 2018 (three months remaining)	$ 2,636
Amortization Expense, December 31, 2019	10,433
Amortization Expense, December 31, 2020	9,854
Amortization Expense, December 31, 2021	9,363
Amortization Expense, December 31, 2022	$ 9,361

XML

Schedule of Accrued Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Schedule of Accrued Liabilities [Line Items]
Employee compensation	$ 7,986	$ 9,560
Taxes	2,719	1,668
Related party payable	1,728
Royalty and license fees	1,065	1,383
Accrued purchases	261	1,191
Warranties	605	598
Professional fees	563	947
Deferred revenue	1,234	960
Other accrued expenses	1,803	1,622
Total	$ 17,964	$ 17,929

XML

Carrying Value of Convertible Senior Notes (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Less: Current portion	$ (102,400)
Total convertible senior notes, long term		$ 99,250
2.125% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Principal amount	114,989	115,000
Unamortized debt discount	(10,706)	(13,395)
Unamortized debt issuance costs	(1,883)	(2,355)
Total convertible senior notes	102,400	99,250
Less: Current portion	$ (102,400)
Total convertible senior notes, long term		$ 99,250

XML

Carrying Value of Convertible Senior Notes (Parenthetical) (Detail) - 2.125% Convertible Senior Notes due 2021	9 Months Ended
	Sep. 30, 2018	May 24, 2016
Debt Instrument [Line Items]
Notes, interest rate	2.125%	2.125%
Notes, due date	Jun. 01, 2021

XML

Convertible Senior Notes - Additional Information (Detail)		3 Months Ended	9 Months Ended
	May 24, 2016 USD ($) d $ / shares	Sep. 30, 2018 USD ($) d	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
Loss on conversion of senior convertible notes			$ (1,000)
Accretion of the debt discount			$ 3,160,000	$ 2,958,000
2.125% Convertible Senior Notes due 2021
Debt Instrument [Line Items]
Notes issued	$ 115,000,000				$ 11,000
Notes, interest rate	2.125%	2.125%	2.125%
Proceeds from issuance of convertible senior notes, net of costs	$ 111,100,000
Notes, frequency of periodic payment			Semi-annually
Notes, date of first required payment			Dec. 01, 2016
Notes, due date			Jun. 01, 2021
Loss on conversion of senior convertible notes			$ (1,000)
Notes threshold percentage of stock price trigger		130.00%
Notes threshold trading days | d		20
Notes threshold consecutive trading days | d		30
Debt instrument, convertible if-converted value in excess of principal		$ 87,400,000
Notes conversion ratio per $1,000 principal amount	31.1813
Notes initial conversion price | $ / shares	$ 32.07
Debt covenants debt default holder percent to declare all notes due minimum	25.00%
Number of days within which entity fails to satisfy obligations considered as event of default	270 days
Notes issued, fair value	$ 96,289,000
Contractual coupon interest		611,000	1,833,000
Accretion of the debt discount		911,000	2,687,000
Amortization of the debt issuance costs		$ 160,000	$ 473,000
Effective interest rate on the Notes		6.60%	6.60%
Notes, carrying value		$ 102,400,000	$ 102,400,000		$ 99,250,000
Fair value of the note		$ 202,400,000	$ 202,400,000
2.125% Convertible Senior Notes due 2021 | On any business day on or after June 5, 2019 and prior to the maturity date
Debt Instrument [Line Items]
Notes threshold percentage of stock price trigger	130.00%
Notes threshold trading days | d	20
Notes threshold consecutive trading days | d	30
Notes redemption price	100.00%

XML

Stock-Based Compensation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended			9 Months Ended
	Sep. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 2,779		$ 1,817	$ 7,672	$ 4,845
Stock options, outstanding	1,033,312			1,033,312		734,940
Number of shares available for future grant	2,906,351			2,906,351
Closing price of common stock	$ 55.46			$ 55.46
Weighted average grant date fair value of share-based awards granted				$ 18.56	$ 16.94
Total fair value of stock options vested				$ 2,113	$ 2,074
Total unrecognized compensation cost	$ 28,360			$ 28,360
Unrecognized compensation cost, weighted average remaining requisite service period				4 years 6 months 3 days
Employee Stock Option | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period				3 years
Employee Stock Option | Minimum | Vest Over Three Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting percentage				20.00%
Employee Stock Option | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period				5 years
Incentive options, term				10 years
Employee Stock Option | Maximum | Vest Over Five Year
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting percentage				33.00%
Non-Employee Directors
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period				1 year
Option To Purchase Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock options, outstanding	1,033,312		749,669	1,033,312	749,669
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock units, outstanding	707,716			707,716
Closing price of common stock	$ 55.46			$ 55.46
Aggregate intrinsic value of restricted stock units vested				$ 5,165	$ 3,480
Weighted average grant date fair value of restricted stock units granted				$ 35.13	$ 36.85
Total grant date fair value of restricted stock units vested				$ 4,065	$ 2,565
Employee Stock Option and Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Incentive options, vesting period		9 years

XML

Stock-Based Compensation Expense (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,779	$ 1,817	$ 7,672	$ 4,845
Cost of product revenue
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	277	197	777	491
Research and development
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	253	127	650	338
Selling, general and administrative
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,249	$ 1,493	$ 6,245	$ 4,016

XML

Summary of Option Activity (Detail) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) $ / shares shares
Options Outstanding
Options outstanding at December 31, 2017 | shares	734,940
Granted | shares	439,678
Exercised | shares	(131,718)
Forfeited/cancelled | shares	(9,588)
Options outstanding at September 30, 2018 | shares	1,033,312
Options exercisable at September 30, 2018 | shares	444,446
Vested and expected to vest at September 30, 2018 | shares	986,509	[1]
Weighted-Average Exercise Price Per Share
Options outstanding at December 31, 2017 | $ / shares	$ 20.80
Granted | $ / shares	34.79
Exercised | $ / shares	18.02
Forfeited/cancelled | $ / shares	29.71
Options outstanding at September 30, 2018 | $ / shares	26.99
Options exercisable at September 30, 2018 | $ / shares	18.73
Vested and expected to vest at September 30, 2018 | $ / shares	$ 26.64	[1]
Weighted-Average Remaining Contractual Term (in years)
Options outstanding at September 30, 2018	7 years 4 months 17 days
Options exercisable at September 30, 2018	5 years 3 months 14 days
Vested and expected to vest at September 30, 2018	7 years 3 months 14 days	[1]
Aggregate Intrinsic Value
Options outstanding at September 30, 2018 | $	$ 29,421
Options exercisable at September 30, 2018 | $	16,325
Vested and expected to vest at September 30, 2018 | $	$ 28,429	[1]

[1] Represents the number of vested options as of September 30, 2018 plus the number of unvested options expected to vest as of September 30, 2018 based on the unvested outstanding options at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

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Summary of Option Activity (Parenthetical) (Detail) - Employee Stock Option	Sep. 30, 2018
Awards Granted to Non-Executive Level Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeiture rates	8.00%
Awards Granted to Executive Level Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeiture rates	3.00%

XML

Summary of RSU and Performance Stock Unit Activity (Detail) - RSU and Performance Stock Units $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($) shares
Options Outstanding
Restricted and performance stock units outstanding at December 31, 2017	505,235
Granted	385,461
Vested	(134,590)
Forfeited/cancelled	(48,390)
Restricted stock units outstanding at September 30, 2018	707,716
Vested and expected to vest at September 30, 2018	649,985	[1]
Weighted-Average Remaining Contractual Term (in years)
Restricted stock units outstanding at September 30, 2018	3 years 11 months 8 days
Vested and expected to vest at September 30, 2018	3 years 5 months 4 days	[1]
Aggregate Intrinsic Value
Restricted stock units outstanding at September 30, 2018 | $	$ 39,250
Vested and expected to vest at September 30, 2018 | $	$ 36,048	[1]

[1] Represents the number of unvested RSUs expected to vest as of September 30, 2018 based on the unvested outstanding RSUs at September 30, 2018 adjusted for estimated forfeiture rates of 8% for awards granted to non-executive level employees and 3% for awards granted to executive level employees.

XML

Summary of RSU and Performance Stock Unit Activity (Parenthetical) (Detail) - Restricted Stock Units (RSUs)	Sep. 30, 2018
Awards Granted to Non-Executive Level Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeiture rates	8.00%
Awards Granted to Executive Level Employees
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Estimated forfeiture rates	3.00%

XML

Income Taxes - Additional Information (Detail) € in Thousands, $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2018	Sep. 30, 2017 USD ($)	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 EUR (€)
Income Taxes [Line Items]
Effective tax rate	27.60%	330.90%	24.60%	(183.80%)
U.S. statutory tax rate	21.00%	34.00%	21.00%	34.00%	35.00%
Income tax benefit from sale of intellectual property		$ (5,625)
Valuation allowance increase (decrease)		$ (9,200)
Net operating loss carry forwards, expiration description					Expire at various dates through December 2037.
Business tax credits carry forwards, expiration description					Expire at various dates through December 2037.
Income Tax Expense (Benefit), Continuing Operations, Adjustment of Deferred Tax (Asset) Liability					$ 12,812
Tax cuts and jobs Act, increased tax provision on undistributed and previously untaxed post-1986 earnings and profits of the specified foreign corporation					3,266
Accounting Standards Update 2016-06 | Other Assets
Income Taxes [Line Items]
Impact on assets and liabilities due to change in accounting principle						$ 5,609
Accounting Standards Update 2016-06 | Deferred Tax Liabilities
Income Taxes [Line Items]
Impact on assets and liabilities due to change in accounting principle						4,932
Accounting Standards Update 2016-06 | Accumulated Deficit
Income Taxes [Line Items]
Impact on assets and liabilities due to change in accounting principle						$ 677
Domestic Tax Authority
Income Taxes [Line Items]
Business tax credits carry forwards					297
State
Income Taxes [Line Items]
Business tax credits carry forwards					99
United States
Income Taxes [Line Items]
Net operating loss carry forwards					19,652
Germany
Income Taxes [Line Items]
Net operating loss carry forwards					$ 743		€ 603

XML

Summary of Tax Returns Periods Subject to Examination by Federal, State and International Tax Authorities (Detail)	9 Months Ended
	Sep. 30, 2018
Germany
Income Tax Examination [Line Items]
Fiscal year subject to examination	2017
Earliest Tax Year | United States
Income Tax Examination [Line Items]
Fiscal year subject to examination	2015
Earliest Tax Year | Sweden
Income Tax Examination [Line Items]
Fiscal year subject to examination	2011
Earliest Tax Year | Netherlands
Income Tax Examination [Line Items]
Fiscal year subject to examination	2012
Latest Tax Year | United States
Income Tax Examination [Line Items]
Fiscal year subject to examination	2017
Latest Tax Year | Sweden
Income Tax Examination [Line Items]
Fiscal year subject to examination	2017
Latest Tax Year | Netherlands
Income Tax Examination [Line Items]
Fiscal year subject to examination	2017

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Fair Value Measurement - Additional Information (Detail) - USD ($)	9 Months Ended
	Sep. 30, 2018	Dec. 31, 2017	May 24, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of other assets	$ 0	$ 0
Fair value of other liabilities	$ 0	0
2.125% Convertible Senior Notes due 2021
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Principal amount		11,000	$ 115,000,000
Notes, due date	Jun. 01, 2021
Notes, frequency of periodic payment	Semi-annually
Notes, date of first required payment	Dec. 01, 2016
Total convertible senior notes	$ 102,400,000	$ 99,250,000
Fair value of convertible senior notes	$ 202,400,000

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Commitments and Contingencies - Additional Information (Detail)		1 Months Ended	9 Months Ended
	Jun. 01, 2018 ft²	Feb. 28, 2018 ft²	Sep. 30, 2018 USD ($)
Commitment And Contingencies [Line Items]
Lease agreement, space | ft²	40,000	63,761
Lease agreement, commencement date		Jun. 01, 2018
Lease agreement, term		126 months
Lease agreement, term			5 years
Number of options to extend the term			2
Lease agreement payment condition			Fixed rent with respect to 40,000 square feet of the Premises commenced on the Commencement Date, and rent for the full 63,761 square feet of the Premises shall begin 19 months following the Commencement Date.
Letter of Credit
Commitment And Contingencies [Line Items]
Lease agreement, security deposit | $			$ 163,000

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Future Minimum Rental Commitments under Company's Leases (Detail) $ in Thousands	Sep. 30, 2018 USD ($)
Operating Leased Assets [Line Items]
2018 (three months remaining)	$ 893
2019	3,425
2020	3,266
2021	2,957
2022	2,049
Thereafter	$ 4,872

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Related Party Transactions - Additional Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2018 USD ($)
Spectrum Inc.
Related Party Transaction [Line Items]
Spectrum Acquisition, tax preparation and other fees	$ 207,000
Principal Owner
Related Party Transaction [Line Items]
Rent Expense	555,000
Accrued refunds current	$ 1,728,000
Principal Owner | Minimum
Related Party Transaction [Line Items]
Non controlling ownership interest minimum	10.00%

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Segment Reporting - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2018 Segment
Segment Reporting Information [Line Items]
Number of operating segment	1

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Percentage of Revenue by Geographic Area (Detail) - Geographic Concentration Risk - Total Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Concentration Risk [Line Items]
Revenues, percentage by country	100.00%	100.00%	100.00%	100.00%
North America
Concentration Risk [Line Items]
Revenues, percentage by country	49.00%	45.00%	47.00%	40.00%
Europe
Concentration Risk [Line Items]
Revenues, percentage by country	39.00%	45.00%	41.00%	50.00%
Asia and Australia
Concentration Risk [Line Items]
Revenues, percentage by country	12.00%	10.00%	12.00%	10.00%
Other
Concentration Risk [Line Items]
Revenues, percentage by country	0.00%	0.00%	0.00%	0.00%

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Percentage of Revenue from Significant Customers (Detail) - Customer Concentration Risk - Sales Revenue	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
MilliporeSigma
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	18.00%	14.00%	17.00%	18.00%
GE Healthcare
Revenue, Major Customer [Line Items]
Revenue from significant customers as a percentage of total revenue	16.00%	17.00%	16.00%	24.00%

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Percentage of Accounts Receivable by Significant Customers (Detail) - Customer Concentration Risk - Accounts Receivable	9 Months Ended	12 Months Ended
	Sep. 30, 2018	Dec. 31, 2017
GE Healthcare
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	21.00%	11.00%
MilliporeSigma
Concentration Risk [Line Items]
Accounts receivable, percentage by customer	14.00%	19.00%