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 March 31, 2022

OR

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

For the transition period from to

Commission file number: 001-38293

SCPHARMACEUTICALS INC.

(Exact name of registrant as specified in its charter)

Delaware	46-5184075
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

2400 District Avenue, Suite 310	01803
Burlington, Massachusetts	(Zip Code)
(Address of principal executive office)

Registrant’s telephone number, including area code: (617) 517-0730

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, par value $0.0001	SCPH	The Nasdaq Global Select Market

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.

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 ☒

As of May 13, 2022, the Registrant had 27,371,488 common shares, $0.0001 par value per share, outstanding.

FORWARD-LOOKING STATEMENTS

This Quarterly Report on Form 10-Q contains express or implied forward-looking statements that are based on our management’s belief and assumptions and on information currently available to our management. Although we believe that the expectations reflected in these forward-looking statements are reasonable, these statements relate to future events or our future operational or financial performance, and involve known and unknown risks, uncertainties and other factors that may cause our actual results, performance or achievements to be materially different from any future results, performance or achievements expressed or implied by these forward-looking statements. Forward-looking statements in this Quarterly Report on Form 10-Q include, but are not limited to, statements about:

•the review and potential approval of the FUROSCIX® new drug application, or NDA, with West’s proprietary on-body infusor on our current projected timelines by the U.S. Food and Drug Administration, or FDA, including any delays in approval related to COVID-19;

•the likelihood of approval by the FDA of our regulatory filings for FUROSCIX using our next generation delivery device;

•the timing or likelihood of other regulatory filings and approvals;

•the outcome of any bridging studies, clinical trials or human factors studies that may be required by the FDA for approval of any of our product candidates;

•the commercialization of FUROSCIX, if approved, including launch preparation, ability to interact with physicians, patient access to FUROSCIX, manufacturing and supply chain matters, including any delays related to COVID-19 in our future planned Phase 4 studies of FUROSCIX incorporating West's proprietary on-body infusor to support the pricing and access to our product candidates;

•the pricing, reimbursement or pharmacoeconomic benefit of FUROSCIX or any other of our product candidates, if approved;

•the rate and degree of market acceptance and clinical utility of FUROSCIX or any other of our product candidates for which we receive marketing approval;

•the initiation, timing, progress and results of our research and development programs, including future preclinical and clinical studies;

•our ability to advance any other product candidates into, and successfully complete, clinical studies and obtain regulatory approval for them;

•our ability to identify additional product candidates;

•the implementation of our strategic plans for our business, product candidates and technology;

•the scope of protection we are able to establish and maintain for intellectual property rights covering FUROSCIX or any other of our product candidates and technology;

•estimates of our expenses, future revenues, capital requirements and our needs for additional financing;

•our ability to manufacture, or the ability of third parties to deliver, sufficient quantities of supplies, components and drug product for commercialization of FUROSCIX or any other of our product candidates, including any delays related to COVID-19;

•our ability to maintain and establish collaborations;

•our ability to fund or obtain funding for our continuing operations, including the commercialization of FUROSCIX, if approved, and the development of our product candidates;

•our future financial performance;

•developments relating to our competitors and our industry, including the impact of government regulation; and

•other risks and uncertainties, including those listed under the caption “Risk Factors” in our Annual Report on Form 10-K for the year ended December 31, 2021.

In some cases, forward-looking statements can be identified by terminology such as “may,” “should,” “expects,” “intends,” “plans,” “anticipates,” “believes,” “estimates,” “predicts,” “potential,” “continue” or the negative of these terms or other comparable terminology. These statements are only predictions. You should not place undue reliance on forward-looking statements because they involve known and unknown risks, uncertainties and other factors, which are, in some cases, beyond our control and which could materially affect results. Factors that may cause actual results to differ materially from current expectations include, among other things, those set forth in Item 1A, “Risk Factors” and elsewhere in our Annual Report on Form 10-K for the year ended December 31, 2021, which was filed with the Securities and Exchange Commission on March 22, 2022, as well as in our subsequent filings with the Securities and Exchange Commission. If one or more of these risks or uncertainties occur, or if our underlying assumptions prove to be incorrect, then actual events or results may vary significantly from those implied or projected

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by the forward-looking statements. No forward-looking statement is a guarantee of future performance. While we may elect to update these forward-looking statements at some point in the future, we have no current intention of doing so except to the extent required by applicable law. You should therefore not rely on these forward-looking statements as representing our views as of any date subsequent to the date of this Quarterly Report on Form 10-Q.

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SCPHARMACEUTICALS INC.

INDEX

		Page
PART I – FINANCIAL INFORMATION
Item 1.	Condensed Consolidated Financial Statements (unaudited)
	Condensed Consolidated Balance Sheets as of December 31, 2021 and March 31, 2022	1
	Condensed Consolidated Statements of Operations and Comprehensive Loss for the Three Months Ended March 31, 2021 and March 31, 2022	2
	Condensed Consolidated Statements of Stockholders’ Equity for the Three Months Ended March 31, 2021 and March 31, 2022	3
	Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2021 and March 31, 2022	4
	Notes to Condensed Consolidated Financial Statements	5
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	15
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	19
Item 4.	Controls and Procedures	20
PART II – OTHER INFORMATION
Item 1.	Legal Proceedings	21
Item 1A.	Risk Factors	21
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	21
Item 3.	Defaults Upon Senior Securities	21
Item 4.	Mine Safety Disclosures	21
Item 5.	Other Information	21
Item 6.	Exhibits	21
Exhibit Index		22
Signatures		23

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PART I — FINANCIAL INFORMATION

SCPHARMACEUTICALS INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(In thousands, except share and per share amounts)

(Unaudited)

	December 31,			March 31,
	2021			2022
Assets
Current assets
Cash and cash equivalents	$	74,268		$	51,630
Restricted cash		182			182
Short-term investments		1,010			13,788
Prepaid expenses		2,791			2,567
Other current assets		24			59
Total current assets		78,275			68,226
Property and equipment, net		69			66
Right-of-use lease assets - operating, net		410			318
Deposits and other assets		283			283
Total assets	$	79,037		$	68,893
Liabilities and Stockholders’ Equity
Current liabilities
Accounts payable	$	544		$	445
Accrued expenses		3,995			3,477
Term loan, short-term		9,805			9,826
Lease obligation - operating, short-term		476			356
Other current liabilities		26			71
Total current liabilities		14,846			14,175
Term loan, long-term		7,354			4,913
Lease obligation - operating, long-term		-			10
Other liabilities		367			402
Total liabilities		22,567			19,500
Commitments and contingencies (Note 11)
Stockholders’ equity
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares    issued and outstanding		-			-
Common stock, $0.0001 par value; 150,000,000 shares authorized as of    March 31, 2022; 27,366,707 and 27,371,488 shares issued and outstanding    as of December 31, 2021 and March 31, 2022, respectively		3			3
Additional paid-in capital		246,166			246,823
Accumulated deficit		(189,698	)		(197,429	)
Accumulated other comprehensive loss		(1	)		(4	)
Total stockholders’ equity		56,470			49,393
Total liabilities and stockholders’ equity	$	79,037		$	68,893

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

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SCPHARMACEUTICALS INC.

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS

(In thousands, except share and per share amounts)

(Unaudited)

	Three Months Ended March 31,
	2021			2022
Operating expenses:
Research and development	$	4,009		$	4,347
General and administrative		2,732			2,893
Total operating expenses		6,741			7,240
Loss from operations		(6,741	)		(7,240	)
Other income		255			14
Interest income		20			13
Interest expense		(636	)		(518	)
Net loss	$	(7,102	)	$	(7,731	)
Net loss per share — basic and diluted	$	(0.26	)	$	(0.28	)
Weighted average common shares outstanding — basic and diluted		27,336,724			27,368,354
Other comprehensive loss:
Unrealized loss on short-term investments	$	(2	)	$	(3	)
Comprehensive loss	$	(7,104	)	$	(7,734	)

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

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SCPHARMACEUTICALS INC.

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY

(In thousands, except share amounts)

(Unaudited)

					ADDITIONAL						OTHER			TOTAL
	COMMON STOCK				PAID-IN			ACCUMULATED			COMPREHENSIVE			STOCKHOLDERS'
	SHARES		AMOUNT		CAPITAL			DEFICIT			INCOME			EQUITY
At December 31, 2021		27,366,707	$	3	$	246,166		$	(189,698	)	$	(1	)	$	56,470
Net loss		—		—		—			(7,731	)		—			(7,731	)
Issuance of common stock upon exercise    of stock options		4,781		—		21			—			—			21
Stock-based compensation		—		—		636			—			—			636
Unrealized loss on short-term investments		—		—		—			—			(3	)		(3	)
At March 31, 2022		27,371,488	$	3	$	246,823		$	(197,429	)	$	(4	)	$	49,393
At December 31, 2020		27,325,959	$	3	$	243,830		$	(161,664	)	$	1		$	82,170
Net loss		—		—		—			(7,102	)		—			(7,102	)
Issuance of common stock upon exercise    of stock options		2,500		—		9			—			—			9
Vesting of restricted stock		26,994		—		(81	)		—			—			(81	)
Stock-based compensation		—		—		521			—			—			521
Unrealized loss on short-term investments		—		—		—			—			(2	)		(2	)
At March 31, 2021		27,355,453	$	3	$	244,279		$	(168,766	)	$	(1	)	$	75,515

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

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SCPHARMACEUTICALS INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(In thousands)

(Unaudited)

	Three Months Ended March 31,
	2021			2022
Cash flows from operating activities
Net loss	$	(7,102	)	$	(7,731	)
Adjustments to reconcile net loss to cash used in operating activities
Depreciation expense		8			9
Amortization expense - right-of-use leased assets - operating		98			93
Accretion expense		79			4
Stock-based compensation		521			636
Non-cash interest expense		127			114
Changes in operating assets and liabilities
Prepaid expenses and other assets		(119	)		187
Accounts payable, accrued expenses and other liabilities		(2,227	)		(681	)
Net cash used in operating activities		(8,615	)		(7,369	)
Cash flows from investing activities
Purchases of property and equipment		-			(6	)
Maturities of short-term investments		16,700			-
Purchases of short-term investments		(3,995	)		(12,784	)
Net cash provided by (used in) investing activities		12,705			(12,790	)
Cash flows from financing activities
Principal payments on term loan		-			(2,500	)
Proceeds from the exercise of vested stock options		9			21
Settlements of restricted stock units for tax withholding obligations		(81	)		-
Net cash used in financing activities		(72	)		(2,479	)
Net increase (decrease) in cash, cash equivalents and restricted cash		4,018			(22,638	)
Cash, cash equivalents and restricted cash at beginning of period		72,001			74,450
Cash, cash equivalents and restricted cash at end of period	$	76,019		$	51,812
Supplemental cash flow information
Interest paid	$	597		$	425
Taxes paid	$	42		$	36

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

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SCPHARMACEUTICALS INC.

Notes to Unaudited Condensed Consolidated Financial Statements

1. Description of Business and Basis of Presentation

Description of Business

scPharmaceuticals LLC was formed as a limited liability company under the laws of the State of Delaware on February 19, 2013. On March 24, 2014, scPharmaceuticals LLC was converted to a Delaware corporation and changed its name to scPharmaceuticals Inc. (“the Company”). The Company is a pharmaceutical company focused on developing and commercializing products that have the potential to optimize the delivery of infused therapies, advance patient care and reduce healthcare costs. The Company’s strategy is designed to enable the subcutaneous administration of therapies that have previously been limited to intravenous (“IV”) delivery. The Company’s headquarters and primary place of business is Burlington, Massachusetts.

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and have been prepared on a basis which assumes that the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. The condensed consolidated financial statements reflect the operations of the Company and its wholly-owned subsidiary, scPharmaceuticals Securities Corporation. Certain information and disclosures normally included in financial statements in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements and related notes for the year ended December 31, 2021 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on March 22, 2022. The Company has determined that it operates in one segment.

The accompanying condensed consolidated balance sheet as of March 31, 2022, the condensed consolidated statements of operations and comprehensive loss and stockholders’ equity for the three months ended March 31, 2021 and 2022 and condensed consolidated statements of cash flows for the three months ended March 31, 2021 and 2022 are unaudited. The unaudited condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the Company’s audited annual financial statements and include, in the opinion of management, adjustments, consisting of normal recurring items, necessary for the fair statement of the condensed consolidated financial statements. The operating results for the three months ended March 31, 2022 are not necessarily indicative of the results expected for the full year ending December 31, 2022.

Liquidity

As of March 31, 2022, the Company had an accumulated deficit of approximately $197.4 million. Management expects to continue to incur operating losses for the foreseeable future. The Company has financed its operations to date from proceeds from the sale of common stock, preferred stock and the incurrence of debt.

As of March 31, 2022, the Company had cash, cash equivalents, restricted cash, and short-term investments of $65.6 million. The Company's existing cash, cash equivalents, restricted cash and short-term investments will be sufficient to meet its cash commitments for at least the next 12 months after the date that the interim condensed consolidated financial statements are issued. Additionally, the Company expects to have access to funds pursuant to an at-the-market offering program with Cowen and Company, LLC (Note 9), or could otherwise seek additional funding through a combination of public or private equity offerings or debt financing if it believes additional resources are needed. Additional financing may not be available on a timely basis on terms acceptable to the Company, or at all.

2. Significant Accounting Policies

Use of Estimates

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 the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reported periods. Actual results could differ from those estimates.

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Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents and restricted cash consists of bank deposits and money market accounts with financial institutions. Cash equivalents are carried at cost which approximates fair value due to their short-term nature and which the Company believes do not have a material exposure to credit risk. The Company considers all highly liquid investments with maturities of three months or less from the date of purchase to be cash equivalents. The Company’s cash and cash equivalent accounts, at times, may exceed federally insured limits. The Company has not experienced any losses in such accounts.

As of March 31, 2022, the Company classified $182,000 as restricted cash related to a letter of credit issued as a security deposit in connection with the Company’s lease of its corporate office facilities (Note 11). Cash, cash equivalents and restricted cash consists of the following (in thousands):

	December 31, 2021		March 31, 2022
Cash and cash equivalents	$	74,268	$	51,630
Restricted cash		182		182
Cash, cash equivalents and restricted cash	$	74,450	$	51,812

Concentration of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents and short-term investments. The Company maintains its cash and cash equivalent balances with high-quality financial institutions and, consequently, the Company believes that such funds are subject to minimal credit risk. The Company’s short-term investments consist of United States Treasury securities, corporate debt securities and commercial paper. The Company has adopted an investment policy that limits the amounts the Company may invest in any one type of investment and requires all investments held by the Company to hold a minimum rating, thereby reducing credit risk exposure.

Investments

The Company invests excess cash balances in available-for-sale debt securities. The Company determines the appropriate classification of these securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. The Company reports available-for-sale investments at fair value at each balance sheet date and includes any unrealized gains and losses in accumulated other comprehensive income (loss), a component of stockholders’ equity. Realized gains and losses are determined using the specific identification method and are included in other income (expense). If any adjustment to fair value reflects a decline in the value of the investment, the Company considers all available evidence to evaluate the extent to which the decline is “other than temporary,” including the intention to sell and, if so, marks the investment to market through a charge to the Company’s consolidated statements of operations and comprehensive loss.

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in right-of-use (“ROU”) lease assets, current portion of lease obligations, and long-term lease obligations on the Company’s balance sheets.

ROU lease assets represent the Company’s right to use an underlying asset for the lease term and lease obligations represent the Company’s obligation to make lease payments arising from the lease. Operating ROU lease assets and obligations are recognized at the commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The ROU lease asset excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) 740, Income Taxes. Deferred tax assets and liabilities are recorded to reflect the impact of temporary differences between amounts of assets and liabilities for financial reporting purposes and such amounts as measured under enacted tax laws. A valuation allowance is required to offset any net deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax asset will not be realized.

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The Company provides reserves for potential payments of tax to various tax authorities related to uncertain tax positions. The tax benefits recorded are based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings or positions is “more likely than not” to be realized following resolution of any uncertainty related to the tax benefit, assuming that the matter in question will be raised by the tax authorities. Potential interest and penalties associated with such uncertain tax positions are recorded as a component of income tax expense. At March 31, 2022, the Company had no such accruals.

As part of the Tax Cuts and Jobs Act of 2017 (TCJA), beginning with the Company’s fiscal year ending December 31, 2022, the Company is required to capitalize research and development expenses, as defined under section 174 of the Internal Revenue Code of 1986, as amended. For expenses that are incurred for research and development in the United States, the amounts will be amortized over 5 years, and expenses that are incurred for research and experimentation outside the United States will be amortized over 15 years. The Company already capitalizes its research and development expenses for income tax purposes as it is a start-up company, so there is no material impact forecasted for this change in legislation in 2022.

3. Net Loss per Share

Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss per share of common stock (in thousands, except share and per share data):

	Three Months Ended March 31,
	2021			2022
Net loss	$	(7,102	)	$	(7,731	)
Weighted-average shares used in computing net loss per share		27,336,724			27,368,354
Net loss per share, basic and diluted	$	(0.26	)	$	(0.28	)

The Company’s potentially dilutive securities, which include stock options and unvested restricted stock units, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect.

	Three Months Ended March 31,
	2021		2022
Stock options to purchase common stock		2,805,029		3,442,152
Unvested restricted stock units		42,250		42,250
Total		2,847,279		3,484,402

4. Investments

Cash in excess of the Company’s immediate requirements is invested in accordance with the Company’s investment policy that primarily seeks to maintain adequate liquidity and preserve capital.

A summary of the Company’s available-for-sale classified investments as of December 31, 2021 and March 31, 2022 consisted of the following (in thousands):

	At December 31, 2021
Investments - Current:	Cost Basis		Accumulated Unrealized Gains		Accumulated Unrealized Losses			Fair Value
Corporate debt securities	$	1,011	$	-	$	(1	)	$	1,010
Total	$	1,011	$	-	$	(1	)	$	1,010

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	At March 31, 2022
Investments - Current:	Cost Basis		Accumulated Unrealized Gains		Accumulated Unrealized Losses			Fair Value
United States Treasury securities	$	8,987	$	-	$	(1	)	$	8,986
Corporate debt securities		2,813		-		(3	)		2,810
Commercial paper		1,992		-		-			1,992
Total	$	13,792	$	-	$	(4	)	$	13,788

The amortized cost and fair value of the Company’s available-for-sale investments, by contract maturity, as of March 31, 2022 consisted of the following (in thousands):

	Amortized Cost		Fair Value
Due in one year or less	$	13,792	$	13,788
Total	$	13,792	$	13,788

5. Property and Equipment

Purchased property and equipment consist of the following (dollars in thousands):

	ESTIMATED USEFUL LIFE	December 31, 2021			March 31, 2022
Office equipment	5 years	$	10		$	6
Office furniture	7 years		126			126
Computer equipment	3 years		8			8
Leasehold improvements	Life of lease		95			95
			239			235
Less: Accumulated depreciation			(170	)		(169	)
Property and equipment, net		$	69		$	66

Depreciation expense for the three months ended March 31, 2021 and March 31, 2022 was $8,000 and $9,000, respectively.

6. Accrued Expenses

Accrued expenses consist of the following (in thousands):

	December 31, 2021		March 31, 2022
Contract research and development	$	2,350	$	2,199
Employee compensation and related costs		1,152		707
Consulting and professional service fees		265		335
Interest		154		132
Financing related costs		60		60
State taxes		5		44
Other		9		-
Total accrued expenses	$	3,995	$	3,477

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7. Fair Value of Financial Instruments

FASB ASC Topic, Fair Value Measurements and Disclosures (“ASC 820”), provides a fair value hierarchy, which classifies fair value measurements based on the inputs used in measuring fair value. 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 applies only to the valuation inputs used in determining the reported fair value of the investments and is not a measure of the investment credit quality. The three levels of the fair value hierarchy are described below:

Level 1—Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2—Valuations based on quoted prices for similar assets or liabilities in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

Level 3—Valuations that require inputs that reflect the Company’s own assumptions that are both significant to the fair value measurement and observable.

To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

The carrying values of the Company’s cash and restricted cash, prepaid expenses and deposits approximate their fair values due to their short-term nature. The carrying value of the Company’s loan payable is considered a reasonable estimate of fair value because the Company’s interest rate is near current market rates for instruments with similar characteristics.

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The following tables summarize the Company’s assets that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	As of December 31, 2021
	TOTAL		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	72,449	$	72,449	$	—	$	—
Total cash equivalents		72,449		72,449		—		—
Corporate debt securities		1,010		—		1,010		—
Investments		1,010		—		1,010		—
Total	$	73,459	$	72,449	$	1,010	$	—
	As of March 31, 2022
	TOTAL		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	49,666	$	47,866	$	1,800	$	—
Total cash equivalents		49,666		47,866		1,800		—
United States Treasury securities		8,986		8,986		—		—
Corporate debt securities		2,810		—		2,810
Commercial paper		1,992		—		1,992		—
Investments		13,788		8,986		4,802		—
Total	$	63,454	$	56,852	$	6,602	$	—

8. Term Loan

In May 2017, the Company entered into a loan and security agreement (the “2017 Loan Agreement”), with SLR Investment Corp. (f/k/a Solar Capital Ltd.) and Silicon Valley Bank (together, the “Lenders”), for $10.0 million.

In September 2019, the Company replaced the 2017 Loan Agreement with a new $20.0 million term loan with the Lenders (the “2019 Loan Agreement”). The 2019 Loan Agreement extends the term of the credit facility until September 17, 2023. Debt issuance costs for the 2019 Loan Agreement, including unamortized issuance costs for the 2017 Loan Agreement, will be amortized to interest expense over the remaining term of the 2019 Loan Agreement using the effective-interest method.

The interest rate under the 2019 Loan Agreement is the higher of (i) LIBOR plus 7.95% or (ii) 10.18% and there was an interest-only period until September 30, 2021. The rate at March 31, 2022 was 10.18%. Pursuant to the 2019 Loan Agreement, the Company provided a first priority security interest in substantially all of the Company’s assets, including intellectual property, subject to certain exceptions.

The Company entered into an Exit Agreement in connection with the 2019 Loan Agreement which provides for an aggregate payment of 4% of the loan commitment, or $800,000, to the lenders upon the occurrence of an exit event (the “Exit Fee”). The Company paid the Exit Fee during 2020 in conjunction with the Company’s public offering, which was deemed to be an exit event pursuant to the Exit Agreement.

As of March 31, 2022, unpaid borrowings under the 2019 Loan Agreement totaled $15.0 million. For the three months ended March 31, 2022, the Company recorded $80,000 related to the amortization of debt discount associated with the 2019 Loan Agreement. For the three months ended March 31, 2021, the Company recorded $87,000 related to the amortization of debt discount associated with the 2019 Loan Agreement.

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The 2019 Loan Agreement allows the Company to voluntarily prepay all (but not less than all) of the outstanding principal at any time. A prepayment premium of 3% or 1% through the one-year anniversary and the two-year anniversary, respectively, would be assessed on the outstanding principal. After the two-year anniversary, a 0.5% prepayment premium would be assessed on the outstanding principal. A final payment fee of $500,000 is due upon the earlier to occur of the maturity date or prepayment of such borrowings. For the three months ended March 31, 2022, the Company recorded $34,000 related to the amortization of the final payment fee associated with the 2019 Loan Agreement. For the three months ended March 31, 2021, the Company recorded $40,000 related to the amortization of the final payment fee associated with the 2019 Loan Agreement.

In an event of default under the 2019 Loan Agreement, the interest rate will be increased by 5% and the balance under the loan may become immediately due and payable at the option of the lenders.

The 2019 Loan Agreement includes restrictions on, among other things, the Company’s ability to incur additional indebtedness, change the name or location of the Company’s business, merge with or acquire other entities, pay dividends or make other distributions to holders of its capital stock, make certain investments, engage in transactions with affiliates, create liens, sell assets or pay subordinated debt.

Total term loan and unamortized debt discount balances are as follows (in thousands):

	March 31, 2022
Face value	$	15,000
Less: discount		(261	)
Total	$	14,739
Less: current portion		(9,826	)
Long-term portion	$	4,913

As of March 31, 2022, future principal payments due under the 2019 Loan Agreement are as follows (in thousands):

Year ended:
December 31, 2022	$	7,500
December 31, 2023		7,500
Total	$	15,000

9. Stockholders’ Equity

2021 At-the-Market Issuance Sales Agreement

On March 23, 2021, the Company entered into an Open Market Sale AgreementSM (the “2021 ATM Agreement”) with Cowen and Company, LLC (“Cowen”) with respect to an at-the-market offering program (the “2021 ATM Program”) under which the Company could offer and sell shares of its common stock (the “2021 ATM Shares”), having an aggregate offering price of up to $50.0 million through Cowen as its sales agent. The Company agreed to pay Cowen a commission up to 3.0% of the gross sales proceeds of such 2021 ATM Shares. As of March 31, 2022, the Company had received no proceeds from the sale of shares of common stock pursuant to the 2021 ATM Agreement.

10. Stock-Based Compensation

Stock Options

The Company’s 2017 Stock Option and Incentive Plan (the “2017 Stock Plan”) became effective in November 2017, upon the closing of the Company’s initial public offering and will expire in October 2027. Under the 2017 Stock Plan, the Company may grant incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units (“RSUs”) and other stock-based awards. The Company’s 2014 Stock Incentive Plan (the “2014 Stock Plan”) was terminated in November 2017 effective upon the completion of the Company’s initial public offering and no further options will be granted under the 2014 Stock Plan. At March 31, 2022, there were 598,619 options outstanding under the 2014 Stock Plan.

As of March 31, 2022, there were 6,143,876 shares of the Company’s common stock authorized for issuance under the 2017 Stock Plan, including 359,652 options that have been forfeited from the 2014 Stock Plan.

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At March 31, 2022, there were 3,228,289 options available for issuance under the 2017 Stock Plan, 2,843,533 options outstanding and 42,250 RSUs outstanding. Awards granted under the 2017 Stock Plan have a term of ten years. Vesting of awards under the 2017 Stock Plan is determined by the board of directors, but is generally over one to four-year terms.

The fair value of options at date of grant was estimated using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended March 31,
	2021		2022
Risk-free interest rate	0.50% - 0.72%		1.67% - 1.90%
Expected dividend yield	0%		0%
Expected life	5.5-6.7 years		5.6-6.7 years
Expected volatility	72%-74%		70%-72%
Weighted-average grant date fair value	$	4.36	$	2.93

The following table summarizes information about stock option activity during the three months ended March 31, 2022 (in thousands, except share and per share data):

	NUMBER OF SHARES			WEIGHTED- AVERAGE EXERCISE PRICE		WEIGHTED- AVERAGE REMAINING CONTRACTUAL TERM		AGGREGATE INTRINSIC VALUE
Outstanding, December 31, 2021		2,662,752		$	6.28
Granted		795,119			4.61
Exercised		(4,781	)		4.42
Forfeited		(10,938	)		8.32
Outstanding, March 31, 2022		3,442,152		$	5.89		7.83	$	2,389
Vested and exercisable, March 31, 2022		1,582,865		$	6.18		6.33	$	1,356
Vested and expected to vest, March 31, 2022		2,777,959		$	5.95		7.52	$	1,997

The following table summarizes information about RSU activity during the three months ended March 31, 2022:

	RSUs		AVERAGE GRANT DATE FAIR VALUE (IN DOLLARS PER SHARE)
Outstanding, December 31, 2021		42,250	$	3.25
Granted		—		—
Vested		—		—
Forfeited		—		—
RSUs outstanding at March 31, 2022		42,250	$	3.25

Unrecognized compensation expense related to unvested options as of March 31, 2022 was $3.8 million and will be recognized over the remaining vesting periods of the underlying awards. The weighted-average period over which such compensation is expected to be recognized is 2.6 years. Unrecognized compensation expense related to unvested RSUs as of March 31, 2022 was $18,000 and will be recognized over the remaining vesting periods of the underlying awards. The weighted-average period over which such compensation is expected to be recognized is 6 months.

Employee Stock Purchase Plan

In October 2017, the board of directors approved the 2017 Employee Stock Purchase Plan ("the ESPP") which became effective in November 2017, upon the closing of the Company's IPO. As part of the ESPP, eligible employees may acquire an ownership interest in the Company by purchasing common stock, at a discount, through payroll deductions. Eligible employees who elected

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to participate were able to participate in the ESPP beginning September 1, 2021. As of March 31, 2022, there were 1,188,629 shares of common stock available for issuance under the ESPP.

The Company recorded stock-based compensation expense in the following expense categories of its accompanying condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2021 and 2022 (in thousands):

	Three Months Ended March 31,
	2021		2022
Research and development	$	226	$	254
General and administrative		295		382
Total	$	521	$	636

11. Commitments and Contingencies

Operating Leases

The Company leases office facilities and equipment under long-term, non-cancelable operating lease agreements. The leases expire at various dates through 2025 and do not include renewal options.

Certain leases provide for increases in future minimum annual rental payments as defined in the lease agreements. The leases generally also include real estate taxes and common area maintenance charges in the annual rental payments.

Pursuant to the terms of its lease agreement for the Company’s headquarters, the Company obtained a letter of credit in the amount of approximately $182,000 as security on the lease obligation. The letter of credit is listed as restricted cash on the Company’s consolidated balance sheets.

Short-term leases are leases having a term of twelve months or less. The Company recognizes short-term leases on a straight-line basis and does not record a related lease asset or liability for such leases.

The following is a maturity analysis of the annual undiscounted cash flows of the operating lease liabilities as of March 31, 2022 (in thousands):

Year ended:
December 31, 2022	$	369
December 31, 2023		9
December 31, 2024		9
December 31, 2025		1
Total minimum lease payments		388
Less imputed interest		(22	)
Total	$	366

	Three Months Ended March 31,
	2021			2022
Lease cost:
Operating lease cost	$	122		$	118
Short-term lease cost		-			13
Sublease income		(13	)		(13	)
Total lease cost	$	109		$	118
Other information
Cash paid for amounts included in the measurement of lease liabilities	$	141		$	140
Operating cash flows from operating leases	$	(14	)	$	(18	)
Weighted-average remaining lease term - operating leases	1.7 years			0.8 years
Weighted-average discount rate - operating leases		10.1	%		10.1	%

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Research and Development Agreements

As part of the Company’s research and development efforts, the Company enters into research and development agreements with certain companies. These agreements contain varying terms and provisions which include fees and milestones to be paid by the Company. Some of these agreements also contain provisions which require the Company to make payments for exclusivity in the development of products in the area of loop diuretics.

12. Subsequent Events

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure.

On April 11, 2022, the Company signed an amendment to the lease for its facility located in Burlington, Massachusetts. The lease commenced on September 1, 2017 and was scheduled to expire on November 30, 2022. The amendment extends the original lease term for a period of 12 months through November 30, 2023 and does not contain any options to extend beyond that term. The amendment results in future minimum lease payments of approximately $640,000.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis of our financial condition and results of operations should be read in conjunction with our financial statements and related notes thereto included elsewhere in this Quarterly Report on Form 10-Q (“Quarterly Report”) and our audited consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2021 (the “Annual Report”) filed with the Securities and Exchange Commission (the “SEC”) on March 22, 2022. Some of the information contained in this discussion and analysis or set forth elsewhere in this Quarterly Report, including information with respect to our plans and strategy for our business, includes forward looking statements that involve risks and uncertainties. As a result of many factors, including those factors set forth in the “Risk Factors” section in our Annual Report and in this Quarterly Report, our actual results could differ materially from the results described in or implied by, the forward-looking statements contained in the following discussion and analysis.

OVERVIEW

We are a pharmaceutical company focused on developing and commercializing products that have the potential to optimize the delivery of infused therapies, advance patient care and reduce healthcare costs. Our strategy is designed to enable the subcutaneous administration of therapies that have previously been limited to intravenous, or IV, delivery. By moving delivery away from the high-cost healthcare settings typically required for IV administration, we believe our technology has the potential to reduce overall healthcare costs and advances the quality and convenience of care. Our lead product candidate, FUROSCIX, consists of our novel formulation of furosemide delivered via an on-body infusor and is under development for treatment of congestion in patients with worsening heart failure who display reduced responsiveness to oral diuretics and do not require hospitalization.

We resubmitted our new drug application, or NDA, for FUROSCIX, with the U.S. Food and Drug Administration, or FDA, on April 8, 2022. The resubmission was accepted on May 13, 2022 and we were assigned a Prescription Drug User Fee Act, or PDUFA, target action date of October 8, 2022.

This resubmission was in response to a Complete Response Letter, or CRL, we received on December 3, 2020 in response to an NDA we submitted on July 23, 2020. In the CRL, the FDA raised questions related to testing, labeling and features of the combination product unrelated to the drug constituent. The FDA also indicated that they needed to conduct pre-approval inspections at certain of our third-party manufacturing facilities. No clinical deficiencies were noted. On January 28, 2021, we had a Type A meeting with the FDA to discuss the issues described in the CRL and steps required for the resubmission of the NDA for FUROSCIX. On June 2, 2021, we had a Type C meeting with the FDA regarding the requirements for resubmission of the FUROSCIX NDA. Based on guidance we received during the meeting and subsequently contained within the meeting minutes, we conducted the required bench testing for West's proprietary on-body infusor. We anticipate the FDA will still need to conduct pre-approval inspections at certain of our third-party manufacturing facilities. If the NDA is approved, we plan to launch in the fourth quarter of 2022.

We completed enrollment in the AT HOME-HF PILOT, a multicenter, randomized, open label, controlled study in heart failure patients with worsening signs and symptoms of congestion requiring augmentation in diuretic therapy outside of an acute care setting. The objective of this pilot study is to evaluate prospective endpoints to inform a potential larger clinical trial. We expect to have data available from the AT HOME-HF PILOT study in the first half of 2022.

We have funded our operations from inception through March 31, 2022 primarily through the sale of shares of our common stock and, prior to that, through the private placement of our preferred stock and the incurrence of debt. We do not have any products approved for sale and have not generated any revenue from product sales.

As of March 31, 2022, we had an accumulated deficit of $197.4 million. We expect to continue to incur net losses for the foreseeable future as we develop the infrastructure to commercialize our products, if approved, in the United States, including building our sales and marketing organization, continuing research and development efforts, engaging in scale-up manufacturing and seeking regulatory approval for new product candidates and enhancements. We will need additional funding to pay expenses related to our operating activities, including selling, general and administrative expenses and research and development expenses. Adequate funding may not be available to us on acceptable terms, or at all. Our failure to obtain sufficient funds on acceptable terms when needed could have a material adverse effect on our business, results of operations or financial condition.

IMPACT OF COVID-19

A new strain of novel coronavirus which causes a severe respiratory disease (“COVID-19”) was identified in 2019, and subsequently declared a pandemic by the World Health Organization, affecting the populations of the United States as well as the rest of the world. In response to the pandemic, we transitioned our workforce to work from home in March 2020. In July 2020, we opened our offices for limited access to employees integrating all recommendations for workplace safety, including appropriate protocols to ensure social-distancing. The health of our employees remains a top priority and we are continuing to

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monitor the impact of COVID-19 including the pace of vaccinations and the emergence of new and more contagious strains of the virus and government regulations.

To date, the third parties that perform our manufacturing, assembly, packaging and testing of our products have experienced delays relating to supply chain logistics but have generally remained operational. The extent of the impact of the evolving COVID-19 pandemic on the timing of the FDA’s review of the FUROSCIX NDA or the ability to timely enroll patients in our upcoming or current clinical trials and our operational and financial performance will depend on future developments, including the duration, severity and spread of the pandemic, related restrictions on travel and transportation, the impact of new strains of the virus, the effectiveness and availability of vaccines and other actions that may be taken by governmental authorities. Such developments may also impact the ability of the FDA to inspect facilities required for approval of our NDA, the business of our suppliers, service providers or customers, and other items identified under “Risk Factors” in our Annual Report on Form 10-K, all of which are uncertain and cannot be predicted. An extended period of global supply chain and economic disruption may continue to impact us and could materially affect our business, results of operations, access to sources of liquidity and financial condition.

COMPONENTS OF OUR RESULTS OF OPERATIONS

Research and Development Expenses

Research and development, or R&D, expenses consist of the cost of engineering, clinical trials, regulatory and medical affairs and quality assurance associated with developing our proprietary technology and product candidates. R&D expenses consist primarily of:

•employee-related expenses, including salaries, benefits, travel expense and stock-based compensation expense;

•cost of outside consultants who assist with technology development, regulatory affairs, clinical trials and medical affairs, and quality assurance;

•cost of clinical trial activities performed by third parties;

•cost of pre-approval pharmaceutical batch manufacturing; and

•cost of facilities and supplies used for internal research and development and clinical activities.

We expense R&D costs as incurred. Given the emphasis to date on our lead product candidate FUROSCIX, our R&D expenses have not been allocated on a program-specific basis. In the future, we expect R&D expenses to increase in absolute dollars as we continue to develop new products and enhance existing products and technologies. We anticipate that our expenses will increase significantly as we:

•pursue regulatory approval of FUROSCIX incorporating West's proprietary on-body infusor;

•continue to advance our pipeline programs beyond FUROSCIX;

•continue our current research and development activity;

•seek to identify additional research programs and additional product candidates;

•initiate preclinical testing and clinical trials for any product candidates we identify and develop, maintain, expand and protect our intellectual property portfolio; and

•hire additional research, clinical and scientific personnel.

General and Administrative Expenses

General and administrative, or G&A, expenses consist of employee-related expenses, including salaries, benefits, travel expense and stock-based compensation expense for personnel in executive, finance, commercial, human resources, facility operations and administrative functions. Other G&A expenses include pre-approval promotional activities, marketing, conferences and trade shows, professional services fees, including legal, audit and tax fees, insurance costs, general corporate expenses and allocated facilities-related expenses.

If we receive FDA approval for FUROSCIX incorporating West’s proprietary on-body infusor, we anticipate that our G&A expenses will increase as we continue to build our corporate and commercial infrastructure to support the development and commercial launch of FUROSCIX in the United States.

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Results of Operations

Comparison of Three Months Ended March 31, 2021 and 2022

The following table summarizes our results of operations for the three months ended March 31, 2021 and 2022 (in thousands):

	Three Months Ended March 31,						Increase
	2021			2022			(Decrease)
Operating expenses:
Research and development	$	4,009		$	4,347		$	338
General and administrative		2,732			2,893			161
Total operating expenses		6,741			7,240			499
Loss from operations		(6,741	)		(7,240	)		499
Other income		255			14			(241	)
Interest income		20			13			(7	)
Interest expense		(636	)		(518	)		(118	)
Net loss	$	(7,102	)	$	(7,731	)	$	629

Research and development expenses. R&D expenses were $4.3 million for the three months ended March 31, 2022, compared to $4.0 million for the three months ended March 31, 2021. The increase of $0.3 million was primarily attributable to a $0.2 million increase in clinical study costs, a $0.2 million increase in regulatory consulting costs, a $0.2 million increase in pharmaceutical supplies, a $0.1 million increase in employee related costs, a $0.1 million increase in device development costs, and a $0.1 million increase in preclinical study costs. The increase was offset by a $0.5 million decrease in pharmaceutical preparation costs and a $0.1 million decrease in clinical consulting costs.

General and administrative expenses. G&A expenses were $2.9 million for the three months ended March 31, 2022, compared to $2.7 million for the three months ended March 31, 2021. The increase of $0.2 million was primarily attributable to a $0.1 million increase in employee-related costs and a $0.1 million increase in commercial preparation costs.

Other income. Other income was $14,000 for the three months ended March 31, 2022, compared to $0.3 million for the three months ended March 31, 2021. The decrease in income of $0.2 million was primarily attributable to the recovery of fees associated with a post-employment matter in the three months ended March 31, 2021.

Interest income. Interest income was $13,000 for the three months ended March 31, 2022, compared to $20,000 for the three months ended March 31, 2021. The decrease of $7,000 was primarily attributable to lower interest rates on and balances in our financial instruments.

Interest expense. Interest expense was $0.5 million for the three months ended March 31, 2022 compared to $0.6 million for the three months ended March 31, 2021. The decrease of $0.1 million was due to lower term loan balances as a result of principal payments which commenced October 1, 2021.

LIQUIDITY AND CAPITAL RESOURCES

Overview

We have funded our operations from inception through March 31, 2022 primarily through the sale of shares of our common stock, through the private placement of our preferred stock and the incurrence of debt. As of March 31, 2022, we had received net cash proceeds of $92.7 million from our initial public offering, $56.7 million from sales of our preferred stock, $18.8 million from borrowings under our term loan, $13.5 million from sales of convertible notes, $50.2 million from our public offering in 2020 and $14.4 million from the sale of common stock in our 2019 at-the-market offering. As of March 31, 2022, we had cash, cash equivalents and restricted cash of $51.8 million and short-term investments of $13.8 million.

On March 23, 2021, we entered into the 2021 ATM Agreement with Cowen to sell shares of our common stock, from time to time, with aggregate gross sales proceeds of up to $50.0 million, through an at-the-market equity offering program under which Cowen will act as our sales agent. As of March 31, 2022, we had received no proceeds from the sale of shares of common stock pursuant to the 2021 ATM Agreement.

We expect to incur substantial additional expenditures in the near future to support our ongoing activities and our plans to obtain regulatory approval for FUROSCIX incorporating West’s proprietary on-body infusor. We believe our existing unrestricted cash is sufficient to fund our operations through at least the next 12 months from the date of this quarterly report. We expect our costs

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and expenses to increase in the future as we prepare for and, if approved, commence U.S. commercialization of FUROSCIX, including the development of a direct sales force, and as we continue to make substantial expenditures on research and development, including to increase our manufacturing capacity and for conducting clinical trials of our product candidates. In connection with such development plans and activities, if we determine that we need additional cash resources, we would seek to access such funds either pursuant to our 2021 ATM Agreement or through a combination of public or private equity offerings or debt financings. Additionally, we continue to incur additional costs as a result of operating as a public company. Our future capital requirements will depend on many factors, including:

•the potential FDA approval of FUROSCIX;

•the costs and expenses of establishing our U.S. sales and marketing infrastructure;

•the degree of success we experience in commercializing FUROSCIX, if approved;

•the revenue generated by sales of FUROSCIX, if approved and other products that may be approved;

•the pricing and reimbursement of FUROSCIX, if approved, and of other product candidates that may be approved;

•the costs, timing and outcomes of clinical trials and regulatory reviews associated with our product candidates;

•the emergence of competing or complementary technological developments;

•the extent to which FUROSCIX, if approved, is adopted by the healthcare community;

•the number and types of future products we develop and commercialize;

•the costs of preparing, filing and prosecuting patent applications and maintaining, enforcing and defending intellectual property-related claims;

•the impact of COVID-19 on our operations; and

•the extent and scope of our general and administrative expenses.

Additional financing may not be available on a timely basis on terms acceptable to us, or at all. We may raise funds in equity, royalty-based or debt financings or enter into additional credit facilities in order to access funds for our capital needs. If we raise additional funds through further issuances of equity or convertible debt securities, our existing stockholders could suffer significant dilution in their percentage ownership of our Company, and any new equity securities we issue could have rights, preferences and privileges senior to those of holders of our common stock. If we raise additional funds through royalty-based financing arrangements, we will likely agree to relinquish rights to potentially valuable future revenue streams and may agree to covenants that restrict our operations or strategic flexibility. Any debt financing obtained by us in the future would cause us to incur additional debt service expenses and could include restrictive covenants relating to our capital raising activities and other financial and operational matters, which may make it more difficult for us to obtain additional capital and pursue business opportunities. If we are unable to obtain adequate financing or financing on terms satisfactory to us when we require it, we may terminate or delay the development of one or more of our products, delay clinical trials necessary to market our products, or delay establishment or expansion of sales and marketing capabilities or other activities necessary to commercialize our products.

CASH FLOWS

The following table summarizes our sources and uses of cash for each of the periods presented:

	Three Months Ended March 31,
(in thousands)	2021			2022
Net cash (used in) provided by:
Operating activities	$	(8,615	)	$	(7,369	)
Investing activities		12,705			(12,790	)
Financing activities		(72	)		(2,479	)
Net increase (decrease) in cash, cash equivalents and restricted cash	$	4,018		$	(22,638	)

Net Cash Used in Operating Activities

During the three months ended March 31, 2022, net cash used in operating activities was $7.4 million, consisting primarily of a net loss of $7.7 million and an increase in net operating assets of $0.5 million. This was offset by non-cash charges of $0.8 million, which primarily consisted of depreciation, amortization related to our right-of-use leased assets, stock-based compensation expense, non-cash interest expense related to amortization of debt discount associated with the 2019 Loan Agreement and

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accretion of discount on investments. The increase in net operating assets is related to accrued expenses for employee-related, pharmaceutical and device development costs.

During the three months ended March 31, 2021, net cash used in operating activities was $8.6 million, consisting primarily of a net loss of $7.1 million and an increase in net operating assets of $2.3 million. This was offset by non-cash charges of $0.8 million which primarily consisted of depreciation, amortization related to our right-of-use leased assets, stock-based compensation expense, non-cash interest expense related to amortization of debt discount associated with the 2019 Loan Agreement and accretion of discount on investments. The increase in net operating assets is related to accrued expenses for employee-related costs and device development costs.

Net Cash Provided by (Used in) Investing Activities

During the three months ended March 31, 2022, net cash used in investing activities was $12.8 million, consisting of purchases of short-term investments.

During the three months ended March 31, 2021, net cash provided by investing activities was $12.7 million, consisting of maturities and purchases of short-term investments.

Net Cash Used in Financing Activities

During the three months ended March 31, 2022, net cash used in financing activities was $2.5 million, consisting primarily of principal term loan payments, offset by stock option exercises.

During the three months ended March 31, 2021, net cash used in financing activities was $72,000, consisting primarily of tax obligations on the settlement of restricted stock units, offset by stock option exercises.

CONTRACTUAL OBLIGATIONS

There were no material changes in our commitments under contractual obligations, as disclosed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations” contained in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the SEC on March 22, 2022.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Management’s discussion and analysis of our financial condition and results of operations is based on our financial statements, which have been prepared in accordance with U.S. generally accepted accounting principles. The preparation of these financial statements requires us to make estimates and assumptions for the reported amounts of assets, liabilities, revenue, expenses and related disclosures. Our estimates are based on our historical experience and on various other factors that we believe are reasonable under the circumstances, the results of which form the basis for making judgments about the carrying value of assets and liabilities that are not readily apparent from other sources. Actual results may differ from these estimates under different assumptions or conditions and any such differences may be material. Our critical accounting policies are more fully described under the heading “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Critical Accounting Policies and Estimates” in our Annual Report on Form 10-K for the fiscal year ended December 31, 2021, filed with the SEC on March 22, 2022.

JOBS ACT ACCOUNTING ELECTION

In April 2012, the Jumpstart Our Business Startups Act of 2012, or JOBS Act, was enacted. Section 107 of the JOBS Act provides that an emerging growth company can take advantage of an extended transition period for complying with new or revised accounting standards. Thus, an emerging growth company can delay the adoption of certain accounting standards until those standards would otherwise apply to private companies. We have elected not to avail ourselves of this extended transition period and, as a result, we adopt new or revised accounting standards on the relevant dates on which adoption of such standards is required for other public companies. This election is irrevocable.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

We are exposed to market risks related to changes in foreign currency exchange rates and interest rates.

We contract with vendors in foreign countries. As such, we have exposure to adverse changes in exchange rates of foreign currencies, principally the Swiss franc and the Euro, associated with our foreign transactions. We believe this exposure to be immaterial. We currently do not hedge against this exposure to fluctuations in exchange rates.

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Our exposure to market risk also relates to interest rate sensitivity, which is affected by changes in the general level of U.S. interest rates. As of March 31, 2022, our aggregate outstanding indebtedness was $15.0 million, which bears interest at the rate at the higher of (i) LIBOR plus 7.95% or (ii) 10.18%. Due to the short-term duration and variable rate of our indebtedness, an immediate 100 basis point change in interest rates would not have a material effect on the fair market value of our debt instruments.

We do not believe that inflation has had a material effect on our business. However, if our costs, in particular costs related to manufacture and supply, were to become subject to significant inflationary pressures, it may adversely impact our business, operating results and financial condition.

Item 4. Controls and Procedures.

Our management, with the participation of our principal executive officer and principal financial officer, evaluated, as of the end of the period covered by this Quarterly Report on Form 10-Q, the effectiveness of our disclosure controls and procedures. Based on that evaluation of our disclosure controls and procedures as of March 31, 2022, our principal executive officer and principal financial officer concluded that our disclosure controls and procedures as of such date are effective at the reasonable assurance level. The term “disclosure controls and procedures,” as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, means controls and other procedures of a company that are designed to ensure 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 within the time periods specified in the SEC’s rules and forms. Disclosure controls and procedures include, without limitation, controls and procedures designed to ensure that information required to be disclosed by us in the reports we file or submit under the Exchange Act is accumulated and communicated to our management, including our principal executive officer and principal financial and accounting officer, as appropriate to allow timely decisions regarding required disclosure. Management recognizes that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving their objectives and our management necessarily applies its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

There were no changes in our internal control over financial reporting during the three months ended March 31, 2022 that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

20

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

Investing in our common stock involves a high degree of risk. Information regarding risk factors appears in Item 1A of our Annual Report on Form 10-K for the year ended December 31, 2021, which was filed with the SEC on March 22, 2022. There have been no material changes from the risk factors previously disclosed in that Annual Report on Form 10-K.

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

On April 11, 2022, we entered into an amendment to the lease for our facility located in Burlington, Massachusetts, or the Lease Amendment, with NEEP Investors Holdings, LLC. The lease commenced on September 1, 2017 and was scheduled to expire on November 30, 2022. The Lease Amendment extends the original lease term for a period of 12 months through November 30, 2023 and does not contain any options to extend beyond that term. The Lease Amendment results in future minimum lease payments of approximately $640,000. The foregoing description of the Lease Amendment does not purport to be complete and is qualified in its entirety by reference to the full text of the Lease Amendment, which is attached as Exhibit 10.1 hereto and incorporated herein by reference.

Item 6. Exhibits

21

EXHIBIT INDEX

Exhibit Number	Description
10.1*	Amendment No.1, dated April 11, 2022, to the Office Lease Agreement, dated as of June 2, 2017, by and between the Registrant and NEEP Investors Holdings LLC.
31.1*	Certification of Principal Executive Officer and Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as Adopted Pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1†	Certification of Principal Executive Officer and Principal Financial Officer Pursuant to 18 U.S.C. Section 1350, as Adopted Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
101.INS*	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCH*	Inline XBRL Taxonomy Extension Schema Document
101.CAL*	Inline XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF*	Inline XBRL Taxonomy Extension Definition Linkbase Document
101.LAB*	Inline XBRL Taxonomy Extension Label Linkbase Document
101.PRE*	Inline XBRL Taxonomy Extension Presentation Linkbase Document
104*	Cover Page Interactive Data File (formatted as inline XBRL with applicable taxonomy extension information contained in Exhibits 101.*)

* Filed herewith.

† This certification will not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended, or otherwise subject to the liability of that section. Such certification will not be deemed to be incorporated by reference into any filing under the Securities Act of 1933, as amended, or the Securities Exchange Act, except to the extent specifically incorporated by reference into such filing.

22

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.

	SCPHARMACEUTICALS INC.
Date: May 16, 2022	By:	/s/ John H. Tucker
		John H. Tucker
		President and Chief Executive Officer (Principal Executive Officer and Principal Financial Officer)

23

EX-10.1

Exhibit 10.1

FIRST AMENDMENT TO LEASE

THIS FIRST AMENDMENT TO LEASE (this “Amendment”) is made and entered into as of April 11, 2022 (the “Effective Date”), by and between NEEP INVESTORS HOLDINGS LLC, a Delaware limited liability company (“Landlord”), and SCPHARMACEUTICALS INC., a Delaware corporation (“Tenant”).

RECITALS

A.Landlord and Tenant are parties to that certain Office Lease Agreement dated as of June 2, 2017, as affected by that certain Commencement Letter executed by Landlord and Tenant on October 10, 2017 (the “Existing Lease”). Pursuant to the Existing Lease, Landlord has leased to Tenant space containing approximately 13,066 rentable square feet (the “Premises”) known as Suite No. 310 on the third (3rd) floor of the building commonly known as and numbered 2400 District Avenue, Burlington, Massachusetts 01803 (the “Building”), as more particularly described in the Existing Lease.

B.The Existing Lease, by its terms, is scheduled to expire on November 30, 2022, and the parties desire to amend the Existing Lease in order to, among other things, extend the Term thereof, all on the following terms and conditions. The Existing Lease, as amended by this Amendment, is herein referred to as the “Lease”.

NOW, THEREFORE, in consideration of the above recitals which by this reference are incorporated herein, the mutual covenants and conditions contained herein and other good and valuable consideration, the receipt and sufficiency of which are hereby acknowledged, Landlord and Tenant hereby amend the Existing Lease and agree and represent as follows:

1.Extension. The Term of the Existing Lease is hereby extended for a period of one (1) year, and shall expire on November 30, 2023 (the “First Extended Termination Date”), unless sooner terminated in accordance with the terms of the Lease. That portion of the Term commencing on December 1, 2022 and ending on the First Extended Termination Date shall be referred to herein as the “First Extended Term”. Effective as of the Effective Date of this Amendment, the defined term (a) “Term,” as used in the Lease, shall mean the Term as extended through the First Extended Termination Date, and (b) “Termination Date,” as used in the Lease, shall mean November 30, 2023.

2.Base Rent for First Extended Term. The schedule of Base Rent payable with respect to the Premises during the First Extended Term shall be as follows:

Months of Term	Annual Rate Per Square Foot	Annual Base Rent	Monthly Base Rent
12/1/2022- 11/30/2023	$49.00	$640,234.00	$53,352.83

3.Operating and Tax Base. Section 1.05 of the Existing Lease shall be modified to read

“Base Year” for Taxes (defined in Exhibit B): Fiscal Year (defined below) 2023 (i.e., July 1, 2022, to June 30, 2023)

Base Year” for Expenses (defined in Exhibit B): calendar year 2023.

4.Condition of Premises. Tenant is currently in possession of the Premises and hereby accepts the same in their “as is” condition, without any agreements, representations, understandings or obligations on the part of Landlord to perform any alterations, repairs or improvements or provide any tenant improvement allowance relating thereto.

5.Miscellaneous.

5.01.This Amendment sets forth the entire agreement between the parties with respect to the matters set forth herein. This Amendment shall be binding upon and shall inure to the benefit of Landlord and Tenant and their respective legal representatives, successors and assigns. There have been no additional oral or written representations or agreements. Tenant agrees that neither Tenant nor its agents or any other parties acting on behalf of Tenant shall disclose any matters set forth in this Amendment or disseminate or distribute any information concerning the terms, details or conditions hereof to any person, firm or entity without obtaining the express written consent of Landlord, except as permitted or required by applicable Laws.

5.02.Except as herein modified or amended, the provisions, conditions and terms of the Existing Lease shall remain unchanged and in full force and effect. In the case of any inconsistency between the provisions of the Existing Lease and this Amendment, the provisions of this Amendment shall govern and control.

5.03.Submission of this Amendment by Landlord is not an offer to enter into this Amendment but rather is a solicitation for such an offer by Tenant. Landlord shall not be bound by this Amendment until Landlord has executed and delivered the same to Tenant. Tenant agrees that its execution of this Amendment constitutes a firm offer to enter the same, which may not be withdrawn for a period of thirty

(30) days after delivery to Landlord (or such other period as may be expressly provided in any other agreement signed by the parties).

5.04.The capitalized terms used in this Amendment shall have the same definitions as set forth in the Existing Lease to the extent that such capitalized terms are defined therein and not redefined in this Amendment.

5.05.Tenant hereby represents to Landlord that Tenant has dealt with no broker, agent or finder in connection with this Amendment, other than JLL, who represented Tenant in this transaction, and Cushman & Wakefield, who represented Landlord in this transaction (together, the “Brokers”). Tenant agrees to indemnify and hold Landlord, its trustees, members, managers, principals, beneficiaries, partners, officers, directors, employees, mortgagee(s) and agents, and the respective principals and members of any such parties, harmless from all claims of any other brokers, agents or finders claiming to have represented Tenant in connection with this Amendment other than the Brokers. Landlord hereby represents to Tenant that Landlord has dealt with no broker, agent or finder in connection with this Amendment other than the Brokers. Landlord agrees to indemnify and hold Tenant, its trustees, members, managers, principals, beneficiaries, partners, officers, directors, employees and agents, and the respective principals and members of any such parties, harmless from all claims of any brokers, agents or

finders claiming to have represented Landlord in connection with this Amendment other than the Brokers.

1.06.Each signatory of this Amendment represents hereby that he or she has the authority to execute and deliver the same on behalf of the party hereto for which such signatory is acting.

1.07.This Amendment may be executed in counterparts and shall constitute an agreement binding on all parties notwithstanding that all parties are not signatories to the original or the same counterpart provided that all parties are furnished a copy or copies thereof reflecting the signature of all parties. Transmission of a facsimile or by email of a pdf copy of the signed counterpart of this Amendment shall be deemed the equivalent of the delivery of the original, and any party so delivering a facsimile or pdf copy of the signed counterpart of this Amendment by email transmission shall in all events deliver to the other party an original signature promptly upon request.

[SIGNATURES ON FOLLOWING PAGE]

IN WITNESS WHEREOF, Landlord and Tenant have duly executed this Amendment under seal in two or more counterparts as of the day and year first above written.

LANDLORD:

NEEP INVESTORS HOLDINGS LLC

By: /s/ Stephen A. Kinsella

Name: Stephen A. Kinsella

Title: Authorized Officer

TENANT:

SCPHARMACEUTICALS INC.

By: /s/ John Tucker

Name: John Tucker

Title: CEO

EX-31.1

Exhibit 31.1

Certification

I, John H. Tucker, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q for the period ended March 31, 2022 of SCPHARMACEUTICALS INC.;

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. I am 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. 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: May 16, 2022	/s/ John H. Tucker
	John H. Tucker
	President and Chief Executive Officer
	(Principal Executive Officer and 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 on Form 10-Q of scPharmaceuticals Inc. (the “Company”) for the period ended March 31, 2022, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, John H. Tucker, President and Chief Executive Officer (Principal Executive Officer and Principal Financial Officer) hereby certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, 18 U.S.C. Section 1350, that to my knowledge:

1)the Report which this statement accompanies fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, as amended; and

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

Date: May 16, 2022	/s/ John H. Tucker
	John H. Tucker
	President and Chief Executive Officer
	(Principal Executive Officer and Principal Financial Officer)

XML

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2022	May 31, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q1
Trading Symbol	SCPH
Entity Registrant Name	SCPHARMACEUTICALS INC.
Entity Central Index Key	0001604950
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Current Reporting Status	Yes
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Shell Company	false
Entity Interactive Data Current	Yes
Title of 12(b) Security	Common stock, par value $0.0001
Security Exchange Name	NASDAQ
Entity File Number	001-38293
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	46-5184075
Entity Address, Address Line One	2400 District Avenue
Entity Address, Address Line Two	Suite 310
Entity Address, City or Town	Burlington
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	01803
City Area Code	617
Local Phone Number	517-0730
Document Quarterly Report	true
Document Transition Report	false
Entity Common Stock, Shares Outstanding		27,371,488

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 51,630	$ 74,268
Restricted cash	182	182
Short-term investments	13,788	1,010
Prepaid expenses	2,567	2,791
Other current assets	59	24
Total current assets	68,226	78,275
Property and equipment, net	66	69
Right-of-use lease assets - operating, net	318	410
Deposits and other assets	283	283
Total assets	68,893	79,037
Current liabilities
Accounts payable	445	544
Accrued expenses	3,477	3,995
Term loan, short-term	9,826	9,805
Lease obligation - operating, short-term	356	476
Other current liabilities	71	26
Total current liabilities	14,175	14,846
Term loan, long-term	4,913	7,354
Lease obligation - operating, long-term	10
Other liabilities	402	367
Total liabilities	19,500	22,567
Commitments and contingencies (Note 11)
Stockholders’ equity
Preferred stock, $0.0001 par value; 10,000,000 shares authorized and no shares issued and outstanding
Common stock, $0.0001 par value; 150,000,000 shares authorized as of March 31, 2022; 27,366,707 and 27,371,488 shares issued and outstanding as of December 31, 2021 and March 31, 2022, respectively	3	3
Additional paid-in capital	246,823	246,166
Accumulated deficit	(197,429)	(189,698)
Accumulated other comprehensive loss	(4)	(1)
Total stockholders’ equity	49,393	56,470
Total liabilities and stockholders’ equity	$ 68,893	$ 79,037

XML

CONDENSED CONSOLIDATED BALANCE SHEETS (Unaudited) (Parenthetical) - $ / shares	Mar. 31, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Preferred stock, par value	$ 0.0001	$ 0.0001
Preferred stock, shares authorized	10,000,000	10,000,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	150,000,000	150,000,000
Common stock, shares issued	27,371,488	27,366,707
Common stock, shares outstanding	27,371,488	27,366,707

XML

CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE LOSS (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Operating expenses:
Research and development	$ 4,347	$ 4,009
General and administrative	2,893	2,732
Total operating expenses	7,240	6,741
Loss from operations	(7,240)	(6,741)
Other income	14	255
Interest income	13	20
Interest expense	(518)	(636)
Net loss	$ (7,731)	$ (7,102)
Net loss per share — basic and diluted	$ (0.28)	$ (0.26)
Weighted average common shares outstanding — basic and diluted	27,368,354	27,336,724
Other comprehensive loss:
Unrealized loss on short-term investments	$ (3)	$ (2)
Comprehensive loss	$ (7,734)	$ (7,104)

XML

CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Accumulated Deficit	Other Comprehensive Income
Beginning Balance at Dec. 31, 2020	$ 82,170	$ 3	$ 243,830	$ (161,664)	$ 1
Beginning Balance, Shares at Dec. 31, 2020		27,325,959
Net loss	(7,102)			(7,102)
Issuance of common stock upon exercise of stock options	9		9
Issuance of common stock upon exercise of stock options, Shares		2,500
Vesting of restricted stock	(81)		(81)
Vesting of restricted stock, Shares		26,994
Stock-based compensation	521		521
Unrealized loss on short-term investments	(2)				(2)
Ending Balance at Mar. 31, 2021	75,515	$ 3	244,279	(168,766)	(1)
Ending Balance, Shares at Mar. 31, 2021		27,355,453
Beginning Balance at Dec. 31, 2021	56,470	$ 3	246,166	(189,698)	(1)
Beginning Balance, Shares at Dec. 31, 2021		27,366,707
Net loss	(7,731)			(7,731)
Issuance of common stock upon exercise of stock options	$ 21		21
Issuance of common stock upon exercise of stock options, Shares	4,781	4,781
Stock-based compensation	$ 636		636
Unrealized loss on short-term investments	(3)				(3)
Ending Balance at Mar. 31, 2022	$ 49,393	$ 3	$ 246,823	$ (197,429)	$ (4)
Ending Balance, Shares at Mar. 31, 2022		27,371,488

XML

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Cash flows from operating activities
Net loss	$ (7,731,000)	$ (7,102,000)
Adjustments to reconcile net loss to cash used in operating activities
Depreciation expense	9,000	8,000
Amortization expense - right-of-use leased assets - operating	93,000	98,000
Accretion expense	4,000	79,000
Stock-based compensation	636,000	521,000
Non-cash interest expense	114,000	127,000
Changes in operating assets and liabilities
Prepaid expenses and other assets	187,000	(119,000)
Accounts payable, accrued expenses and other liabilities	(681,000)	(2,227,000)
Net cash used in operating activities	(7,369,000)	(8,615,000)
Cash flows from investing activities
Purchases of property and equipment	(6,000)
Maturities of short-term investments		16,700,000
Purchases of short-term investments	(12,784,000)	(3,995,000)
Net cash provided by (used in) investing activities	(12,790,000)	12,705,000
Cash flows from financing activities
Principal payments on term loan	(2,500,000)
Proceeds from the exercise of vested stock options	21,000	9,000
Settlements of restricted stock units for tax withholding obligations		(81,000)
Net cash used in financing activities	(2,479,000)	(72,000)
Net increase (decrease) in cash, cash equivalents and restricted cash	(22,638,000)	4,018,000
Cash, cash equivalents and restricted cash at beginning of period	74,450,000	72,001,000
Cash, cash equivalents and restricted cash at end of period	51,812,000	76,019,000
Supplemental cash flow information
Interest paid	425,000	597,000
Taxes paid	$ 36,000	$ 42,000

XML

Description of Business and Basis of Presentation

3 Months Ended

Mar. 31, 2022

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Description of Business and Basis of Presentation

1. Description of Business and Basis of Presentation

Description of Business

scPharmaceuticals LLC was formed as a limited liability company under the laws of the State of Delaware on February 19, 2013. On March 24, 2014, scPharmaceuticals LLC was converted to a Delaware corporation and changed its name to scPharmaceuticals Inc. (“the Company”). The Company is a pharmaceutical company focused on developing and commercializing products that have the potential to optimize the delivery of infused therapies, advance patient care and reduce healthcare costs. The Company’s strategy is designed to enable the subcutaneous administration of therapies that have previously been limited to intravenous (“IV”) delivery. The Company’s headquarters and primary place of business is Burlington, Massachusetts.

Basis of Presentation

The accompanying condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States (“U.S. GAAP”) for interim financial information and have been prepared on a basis which assumes that the Company will continue as a going concern, which contemplates the realization of assets and the satisfaction of liabilities and commitments in the normal course of business. The condensed consolidated financial statements reflect the operations of the Company and its wholly-owned subsidiary, scPharmaceuticals Securities Corporation. Certain information and disclosures normally included in financial statements in accordance with U.S. GAAP have been condensed or omitted. Accordingly, these condensed consolidated financial statements should be read in conjunction with the Company’s audited financial statements and related notes for the year ended December 31, 2021 included in the Company’s Annual Report on Form 10-K filed with the Securities and Exchange Commission (the “SEC”) on March 22, 2022. The Company has determined that it operates in one segment.

The accompanying condensed consolidated balance sheet as of March 31, 2022, the condensed consolidated statements of operations and comprehensive loss and stockholders’ equity for the three months ended March 31, 2021 and 2022 and condensed consolidated statements of cash flows for the three months ended March 31, 2021 and 2022 are unaudited. The unaudited condensed consolidated financial statements have been prepared on a basis consistent with that used to prepare the Company’s audited annual financial statements and include, in the opinion of management, adjustments, consisting of normal recurring items, necessary for the fair statement of the condensed consolidated financial statements. The operating results for the three months ended March 31, 2022 are not necessarily indicative of the results expected for the full year ending December 31, 2022.

Liquidity

As of March 31, 2022, the Company had an accumulated deficit of approximately $197.4 million. Management expects to continue to incur operating losses for the foreseeable future. The Company has financed its operations to date from proceeds from the sale of common stock, preferred stock and the incurrence of debt.

As of March 31, 2022, the Company had cash, cash equivalents, restricted cash, and short-term investments of $65.6 million. The Company's existing cash, cash equivalents, restricted cash and short-term investments will be sufficient to meet its cash commitments for at least the next 12 months after the date that the interim condensed consolidated financial statements are issued. Additionally, the Company expects to have access to funds pursuant to an at-the-market offering program with Cowen and Company, LLC (Note 9), or could otherwise seek additional funding through a combination of public or private equity offerings or debt financing if it believes additional resources are needed. Additional financing may not be available on a timely basis on terms acceptable to the Company, or at all.

XML

Significant Accounting Policies

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Significant Accounting Policies

2. Significant Accounting Policies

Use of Estimates

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 the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reported periods. Actual results could differ from those estimates.

Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents and restricted cash consists of bank deposits and money market accounts with financial institutions. Cash equivalents are carried at cost which approximates fair value due to their short-term nature and which the Company believes do not have a material exposure to credit risk. The Company considers all highly liquid investments with maturities of three months or less from the date of purchase to be cash equivalents. The Company’s cash and cash equivalent accounts, at times, may exceed federally insured limits. The Company has not experienced any losses in such accounts.

As of March 31, 2022, the Company classified $182,000 as restricted cash related to a letter of credit issued as a security deposit in connection with the Company’s lease of its corporate office facilities (Note 11). Cash, cash equivalents and restricted cash consists of the following (in thousands):

	December 31, 2021		March 31, 2022
Cash and cash equivalents	$	74,268	$	51,630
Restricted cash		182		182
Cash, cash equivalents and restricted cash	$	74,450	$	51,812

Concentration of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents and short-term investments. The Company maintains its cash and cash equivalent balances with high-quality financial institutions and, consequently, the Company believes that such funds are subject to minimal credit risk. The Company’s short-term investments consist of United States Treasury securities, corporate debt securities and commercial paper. The Company has adopted an investment policy that limits the amounts the Company may invest in any one type of investment and requires all investments held by the Company to hold a minimum rating, thereby reducing credit risk exposure.

Investments

The Company invests excess cash balances in available-for-sale debt securities. The Company determines the appropriate classification of these securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. The Company reports available-for-sale investments at fair value at each balance sheet date and includes any unrealized gains and losses in accumulated other comprehensive income (loss), a component of stockholders’ equity. Realized gains and losses are determined using the specific identification method and are included in other income (expense). If any adjustment to fair value reflects a decline in the value of the investment, the Company considers all available evidence to evaluate the extent to which the decline is “other than temporary,” including the intention to sell and, if so, marks the investment to market through a charge to the Company’s consolidated statements of operations and comprehensive loss.

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in right-of-use (“ROU”) lease assets, current portion of lease obligations, and long-term lease obligations on the Company’s balance sheets.

ROU lease assets represent the Company’s right to use an underlying asset for the lease term and lease obligations represent the Company’s obligation to make lease payments arising from the lease. Operating ROU lease assets and obligations are recognized at the commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The ROU lease asset excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) 740, Income Taxes. Deferred tax assets and liabilities are recorded to reflect the impact of temporary differences between amounts of assets and liabilities for financial reporting purposes and such amounts as measured under enacted tax laws. A valuation allowance is required to offset any net deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax asset will not be realized.

The Company provides reserves for potential payments of tax to various tax authorities related to uncertain tax positions. The tax benefits recorded are based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings or positions is “more likely than not” to be realized following resolution of any uncertainty related to the tax benefit, assuming that the matter in question will be raised by the tax authorities. Potential interest and penalties associated with such uncertain tax positions are recorded as a component of income tax expense. At March 31, 2022, the Company had no such accruals.

As part of the Tax Cuts and Jobs Act of 2017 (TCJA), beginning with the Company’s fiscal year ending December 31, 2022, the Company is required to capitalize research and development expenses, as defined under section 174 of the Internal Revenue Code of 1986, as amended. For expenses that are incurred for research and development in the United States, the amounts will be amortized over 5 years, and expenses that are incurred for research and experimentation outside the United States will be amortized over 15 years. The Company already capitalizes its research and development expenses for income tax purposes as it is a start-up company, so there is no material impact forecasted for this change in legislation in 2022.

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Net Loss per Share

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Net Loss per Share

3. Net Loss per Share

Net Loss per Share Attributable to Common Stockholders

The following table sets forth the computation of basic and diluted net loss per share of common stock (in thousands, except share and per share data):

	Three Months Ended March 31,
	2021			2022
Net loss	$	(7,102	)	$	(7,731	)
Weighted-average shares used in computing net loss per share		27,336,724			27,368,354
Net loss per share, basic and diluted	$	(0.26	)	$	(0.28	)

The Company’s potentially dilutive securities, which include stock options and unvested restricted stock units, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect.

	Three Months Ended March 31,
	2021		2022
Stock options to purchase common stock		2,805,029		3,442,152
Unvested restricted stock units		42,250		42,250
Total		2,847,279		3,484,402

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Investments

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investments

4. Investments

Cash in excess of the Company’s immediate requirements is invested in accordance with the Company’s investment policy that primarily seeks to maintain adequate liquidity and preserve capital.

A summary of the Company’s available-for-sale classified investments as of December 31, 2021 and March 31, 2022 consisted of the following (in thousands):

	At December 31, 2021
Investments - Current:	Cost Basis		Accumulated Unrealized Gains		Accumulated Unrealized Losses			Fair Value
Corporate debt securities	$	1,011	$	-	$	(1	)	$	1,010
Total	$	1,011	$	-	$	(1	)	$	1,010

	At March 31, 2022
Investments - Current:	Cost Basis		Accumulated Unrealized Gains		Accumulated Unrealized Losses			Fair Value
United States Treasury securities	$	8,987	$	-	$	(1	)	$	8,986
Corporate debt securities		2,813		-		(3	)		2,810
Commercial paper		1,992		-		-			1,992
Total	$	13,792	$	-	$	(4	)	$	13,788

The amortized cost and fair value of the Company’s available-for-sale investments, by contract maturity, as of March 31, 2022 consisted of the following (in thousands):

	Amortized Cost		Fair Value
Due in one year or less	$	13,792	$	13,788
Total	$	13,792	$	13,788

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Property and Equipment

3 Months Ended

Mar. 31, 2022

Property, Plant and Equipment [Abstract]

Property and Equipment

5. Property and Equipment

Purchased property and equipment consist of the following (dollars in thousands):

	ESTIMATED USEFUL LIFE	December 31, 2021			March 31, 2022
Office equipment	5 years	$	10		$	6
Office furniture	7 years		126			126
Computer equipment	3 years		8			8
Leasehold improvements	Life of lease		95			95
			239			235
Less: Accumulated depreciation			(170	)		(169	)
Property and equipment, net		$	69		$	66

Depreciation expense for the three months ended March 31, 2021 and March 31, 2022 was $8,000 and $9,000, respectively.

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Accrued Expenses

3 Months Ended

Mar. 31, 2022

Accrued Liabilities, Current [Abstract]

Accrued Expenses

6. Accrued Expenses

Accrued expenses consist of the following (in thousands):

	December 31, 2021		March 31, 2022
Contract research and development	$	2,350	$	2,199
Employee compensation and related costs		1,152		707
Consulting and professional service fees		265		335
Interest		154		132
Financing related costs		60		60
State taxes		5		44
Other		9		-
Total accrued expenses	$	3,995	$	3,477

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Fair Value of Financial Instruments

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value of Financial Instruments

7. Fair Value of Financial Instruments

FASB ASC Topic, Fair Value Measurements and Disclosures (“ASC 820”), provides a fair value hierarchy, which classifies fair value measurements based on the inputs used in measuring fair value. 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 applies only to the valuation inputs used in determining the reported fair value of the investments and is not a measure of the investment credit quality. The three levels of the fair value hierarchy are described below:

Level 1—Valuations based on unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access at the measurement date.

Level 2—Valuations based on quoted prices for similar assets or liabilities in markets that are not active or for which all significant inputs are observable, either directly or indirectly.

Level 3—Valuations that require inputs that reflect the Company’s own assumptions that are both significant to the fair value measurement and observable.

To the extent that valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised by the Company in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

The carrying values of the Company’s cash and restricted cash, prepaid expenses and deposits approximate their fair values due to their short-term nature. The carrying value of the Company’s loan payable is considered a reasonable estimate of fair value because the Company’s interest rate is near current market rates for instruments with similar characteristics.

The following tables summarize the Company’s assets that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	As of December 31, 2021
	TOTAL		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	72,449	$	72,449	$	—	$	—
Total cash equivalents		72,449		72,449		—		—
Corporate debt securities		1,010		—		1,010		—
Investments		1,010		—		1,010		—
Total	$	73,459	$	72,449	$	1,010	$	—
	As of March 31, 2022
	TOTAL		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	49,666	$	47,866	$	1,800	$	—
Total cash equivalents		49,666		47,866		1,800		—
United States Treasury securities		8,986		8,986		—		—
Corporate debt securities		2,810		—		2,810
Commercial paper		1,992		—		1,992		—
Investments		13,788		8,986		4,802		—
Total	$	63,454	$	56,852	$	6,602	$	—

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Term Loan

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Term Loan

8. Term Loan

In May 2017, the Company entered into a loan and security agreement (the “2017 Loan Agreement”), with SLR Investment Corp. (f/k/a Solar Capital Ltd.) and Silicon Valley Bank (together, the “Lenders”), for $10.0 million.

In September 2019, the Company replaced the 2017 Loan Agreement with a new $20.0 million term loan with the Lenders (the “2019 Loan Agreement”). The 2019 Loan Agreement extends the term of the credit facility until September 17, 2023. Debt issuance costs for the 2019 Loan Agreement, including unamortized issuance costs for the 2017 Loan Agreement, will be amortized to interest expense over the remaining term of the 2019 Loan Agreement using the effective-interest method.

The interest rate under the 2019 Loan Agreement is the higher of (i) LIBOR plus 7.95% or (ii) 10.18% and there was an interest-only period until September 30, 2021. The rate at March 31, 2022 was 10.18%. Pursuant to the 2019 Loan Agreement, the Company provided a first priority security interest in substantially all of the Company’s assets, including intellectual property, subject to certain exceptions.

The Company entered into an Exit Agreement in connection with the 2019 Loan Agreement which provides for an aggregate payment of 4% of the loan commitment, or $800,000, to the lenders upon the occurrence of an exit event (the “Exit Fee”). The Company paid the Exit Fee during 2020 in conjunction with the Company’s public offering, which was deemed to be an exit event pursuant to the Exit Agreement.

As of March 31, 2022, unpaid borrowings under the 2019 Loan Agreement totaled $15.0 million. For the three months ended March 31, 2022, the Company recorded $80,000 related to the amortization of debt discount associated with the 2019 Loan Agreement. For the three months ended March 31, 2021, the Company recorded $87,000 related to the amortization of debt discount associated with the 2019 Loan Agreement.

The 2019 Loan Agreement allows the Company to voluntarily prepay all (but not less than all) of the outstanding principal at any time. A prepayment premium of 3% or 1% through the one-year anniversary and the two-year anniversary, respectively, would be assessed on the outstanding principal. After the two-year anniversary, a 0.5% prepayment premium would be assessed on the outstanding principal. A final payment fee of $500,000 is due upon the earlier to occur of the maturity date or prepayment of such borrowings. For the three months ended March 31, 2022, the Company recorded $34,000 related to the amortization of the final payment fee associated with the 2019 Loan Agreement. For the three months ended March 31, 2021, the Company recorded $40,000 related to the amortization of the final payment fee associated with the 2019 Loan Agreement.

In an event of default under the 2019 Loan Agreement, the interest rate will be increased by 5% and the balance under the loan may become immediately due and payable at the option of the lenders.

The 2019 Loan Agreement includes restrictions on, among other things, the Company’s ability to incur additional indebtedness, change the name or location of the Company’s business, merge with or acquire other entities, pay dividends or make other distributions to holders of its capital stock, make certain investments, engage in transactions with affiliates, create liens, sell assets or pay subordinated debt.

Total term loan and unamortized debt discount balances are as follows (in thousands):

	March 31, 2022
Face value	$	15,000
Less: discount		(261	)
Total	$	14,739
Less: current portion		(9,826	)
Long-term portion	$	4,913

As of March 31, 2022, future principal payments due under the 2019 Loan Agreement are as follows (in thousands):

Year ended:
December 31, 2022	$	7,500
December 31, 2023		7,500
Total	$	15,000

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Stockholders' Equity

3 Months Ended

Mar. 31, 2022

Equity [Abstract]

Stockholders' Equity

9. Stockholders’ Equity

2021 At-the-Market Issuance Sales Agreement

On March 23, 2021, the Company entered into an Open Market Sale AgreementSM (the “2021 ATM Agreement”) with Cowen and Company, LLC (“Cowen”) with respect to an at-the-market offering program (the “2021 ATM Program”) under which the Company could offer and sell shares of its common stock (the “2021 ATM Shares”), having an aggregate offering price of up to $50.0 million through Cowen as its sales agent. The Company agreed to pay Cowen a commission up to 3.0% of the gross sales proceeds of such 2021 ATM Shares. As of March 31, 2022, the Company had received no proceeds from the sale of shares of common stock pursuant to the 2021 ATM Agreement.

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Stock-Based Compensation

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Stock-Based Compensation

10. Stock-Based Compensation

Stock Options

The Company’s 2017 Stock Option and Incentive Plan (the “2017 Stock Plan”) became effective in November 2017, upon the closing of the Company’s initial public offering and will expire in October 2027. Under the 2017 Stock Plan, the Company may grant incentive stock options, non-statutory stock options, restricted stock awards, restricted stock units (“RSUs”) and other stock-based awards. The Company’s 2014 Stock Incentive Plan (the “2014 Stock Plan”) was terminated in November 2017 effective upon the completion of the Company’s initial public offering and no further options will be granted under the 2014 Stock Plan. At March 31, 2022, there were 598,619 options outstanding under the 2014 Stock Plan.

As of March 31, 2022, there were 6,143,876 shares of the Company’s common stock authorized for issuance under the 2017 Stock Plan, including 359,652 options that have been forfeited from the 2014 Stock Plan.

At March 31, 2022, there were 3,228,289 options available for issuance under the 2017 Stock Plan, 2,843,533 options outstanding and 42,250 RSUs outstanding. Awards granted under the 2017 Stock Plan have a term of ten years. Vesting of awards under the 2017 Stock Plan is determined by the board of directors, but is generally over one to four-year terms.

The fair value of options at date of grant was estimated using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended March 31,
	2021		2022
Risk-free interest rate	0.50% - 0.72%		1.67% - 1.90%
Expected dividend yield	0%		0%
Expected life	5.5-6.7 years		5.6-6.7 years
Expected volatility	72%-74%		70%-72%
Weighted-average grant date fair value	$	4.36	$	2.93

The following table summarizes information about stock option activity during the three months ended March 31, 2022 (in thousands, except share and per share data):

	NUMBER OF SHARES			WEIGHTED- AVERAGE EXERCISE PRICE		WEIGHTED- AVERAGE REMAINING CONTRACTUAL TERM		AGGREGATE INTRINSIC VALUE
Outstanding, December 31, 2021		2,662,752		$	6.28
Granted		795,119			4.61
Exercised		(4,781	)		4.42
Forfeited		(10,938	)		8.32
Outstanding, March 31, 2022		3,442,152		$	5.89		7.83	$	2,389
Vested and exercisable, March 31, 2022		1,582,865		$	6.18		6.33	$	1,356
Vested and expected to vest, March 31, 2022		2,777,959		$	5.95		7.52	$	1,997

The following table summarizes information about RSU activity during the three months ended March 31, 2022:

	RSUs		AVERAGE GRANT DATE FAIR VALUE (IN DOLLARS PER SHARE)
Outstanding, December 31, 2021		42,250	$	3.25
Granted		—		—
Vested		—		—
Forfeited		—		—
RSUs outstanding at March 31, 2022		42,250	$	3.25

Unrecognized compensation expense related to unvested options as of March 31, 2022 was $3.8 million and will be recognized over the remaining vesting periods of the underlying awards. The weighted-average period over which such compensation is expected to be recognized is 2.6 years. Unrecognized compensation expense related to unvested RSUs as of March 31, 2022 was $18,000 and will be recognized over the remaining vesting periods of the underlying awards. The weighted-average period over which such compensation is expected to be recognized is 6 months.

Employee Stock Purchase Plan

In October 2017, the board of directors approved the 2017 Employee Stock Purchase Plan ("the ESPP") which became effective in November 2017, upon the closing of the Company's IPO. As part of the ESPP, eligible employees may acquire an ownership interest in the Company by purchasing common stock, at a discount, through payroll deductions. Eligible employees who elected

to participate were able to participate in the ESPP beginning September 1, 2021. As of March 31, 2022, there were 1,188,629 shares of common stock available for issuance under the ESPP.

The Company recorded stock-based compensation expense in the following expense categories of its accompanying condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2021 and 2022 (in thousands):

	Three Months Ended March 31,
	2021		2022
Research and development	$	226	$	254
General and administrative		295		382
Total	$	521	$	636

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

11. Commitments and Contingencies

Operating Leases

The Company leases office facilities and equipment under long-term, non-cancelable operating lease agreements. The leases expire at various dates through 2025 and do not include renewal options.

Certain leases provide for increases in future minimum annual rental payments as defined in the lease agreements. The leases generally also include real estate taxes and common area maintenance charges in the annual rental payments.

Pursuant to the terms of its lease agreement for the Company’s headquarters, the Company obtained a letter of credit in the amount of approximately $182,000 as security on the lease obligation. The letter of credit is listed as restricted cash on the Company’s consolidated balance sheets.

Short-term leases are leases having a term of twelve months or less. The Company recognizes short-term leases on a straight-line basis and does not record a related lease asset or liability for such leases.

The following is a maturity analysis of the annual undiscounted cash flows of the operating lease liabilities as of March 31, 2022 (in thousands):

Year ended:
December 31, 2022	$	369
December 31, 2023		9
December 31, 2024		9
December 31, 2025		1
Total minimum lease payments		388
Less imputed interest		(22	)
Total	$	366

	Three Months Ended March 31,
	2021			2022
Lease cost:
Operating lease cost	$	122		$	118
Short-term lease cost		-			13
Sublease income		(13	)		(13	)
Total lease cost	$	109		$	118
Other information
Cash paid for amounts included in the measurement of lease liabilities	$	141		$	140
Operating cash flows from operating leases	$	(14	)	$	(18	)
Weighted-average remaining lease term - operating leases	1.7 years			0.8 years
Weighted-average discount rate - operating leases		10.1	%		10.1	%

Research and Development Agreements

As part of the Company’s research and development efforts, the Company enters into research and development agreements with certain companies. These agreements contain varying terms and provisions which include fees and milestones to be paid by the Company. Some of these agreements also contain provisions which require the Company to make payments for exclusivity in the development of products in the area of loop diuretics.

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Subsequent Events

3 Months Ended

Mar. 31, 2022

Subsequent Events [Abstract]

Subsequent Events

12. Subsequent Events

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence relative to certain estimates or to identify matters that require additional disclosure.

On April 11, 2022, the Company signed an amendment to the lease for its facility located in Burlington, Massachusetts. The lease commenced on September 1, 2017 and was scheduled to expire on November 30, 2022. The amendment extends the original lease term for a period of 12 months through November 30, 2023 and does not contain any options to extend beyond that term. The amendment results in future minimum lease payments of approximately $640,000.

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Significant Accounting Policies (Policies)

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Use of Estimates

Use of Estimates

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 the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reported periods. Actual results could differ from those estimates.

Cash Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

Cash, cash equivalents and restricted cash consists of bank deposits and money market accounts with financial institutions. Cash equivalents are carried at cost which approximates fair value due to their short-term nature and which the Company believes do not have a material exposure to credit risk. The Company considers all highly liquid investments with maturities of three months or less from the date of purchase to be cash equivalents. The Company’s cash and cash equivalent accounts, at times, may exceed federally insured limits. The Company has not experienced any losses in such accounts.

As of March 31, 2022, the Company classified $182,000 as restricted cash related to a letter of credit issued as a security deposit in connection with the Company’s lease of its corporate office facilities (Note 11). Cash, cash equivalents and restricted cash consists of the following (in thousands):

	December 31, 2021		March 31, 2022
Cash and cash equivalents	$	74,268	$	51,630
Restricted cash		182		182
Cash, cash equivalents and restricted cash	$	74,450	$	51,812

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments that subject the Company to credit risk primarily consist of cash and cash equivalents and short-term investments. The Company maintains its cash and cash equivalent balances with high-quality financial institutions and, consequently, the Company believes that such funds are subject to minimal credit risk. The Company’s short-term investments consist of United States Treasury securities, corporate debt securities and commercial paper. The Company has adopted an investment policy that limits the amounts the Company may invest in any one type of investment and requires all investments held by the Company to hold a minimum rating, thereby reducing credit risk exposure.

Investments

Investments

The Company invests excess cash balances in available-for-sale debt securities. The Company determines the appropriate classification of these securities at the time they are acquired and evaluates the appropriateness of such classifications at each balance sheet date. The Company reports available-for-sale investments at fair value at each balance sheet date and includes any unrealized gains and losses in accumulated other comprehensive income (loss), a component of stockholders’ equity. Realized gains and losses are determined using the specific identification method and are included in other income (expense). If any adjustment to fair value reflects a decline in the value of the investment, the Company considers all available evidence to evaluate the extent to which the decline is “other than temporary,” including the intention to sell and, if so, marks the investment to market through a charge to the Company’s consolidated statements of operations and comprehensive loss.

Leases

Leases

The Company determines if an arrangement is a lease at inception. Operating leases are included in right-of-use (“ROU”) lease assets, current portion of lease obligations, and long-term lease obligations on the Company’s balance sheets.

ROU lease assets represent the Company’s right to use an underlying asset for the lease term and lease obligations represent the Company’s obligation to make lease payments arising from the lease. Operating ROU lease assets and obligations are recognized at the commencement date based on the present value of lease payments over the lease term. As most of the Company’s leases do not provide an implicit rate, the Company uses its incremental borrowing rate based on the information available at the commencement date in determining the present value of lease payments. The ROU lease asset excludes lease incentives. The Company’s lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise that option. Lease expense for lease payments is recognized on a straight-line basis over the lease term.

Income Taxes

Income Taxes

The Company accounts for income taxes in accordance with the Financial Accounting Standards Board’s (“FASB”) Accounting Standards Codification (“ASC”) 740, Income Taxes. Deferred tax assets and liabilities are recorded to reflect the impact of temporary differences between amounts of assets and liabilities for financial reporting purposes and such amounts as measured under enacted tax laws. A valuation allowance is required to offset any net deferred tax assets if, based upon the available evidence, it is more likely than not that some or all of the deferred tax asset will not be realized.

The Company provides reserves for potential payments of tax to various tax authorities related to uncertain tax positions. The tax benefits recorded are based on a determination of whether and how much of a tax benefit taken by the Company in its tax filings or positions is “more likely than not” to be realized following resolution of any uncertainty related to the tax benefit, assuming that the matter in question will be raised by the tax authorities. Potential interest and penalties associated with such uncertain tax positions are recorded as a component of income tax expense. At March 31, 2022, the Company had no such accruals.

As part of the Tax Cuts and Jobs Act of 2017 (TCJA), beginning with the Company’s fiscal year ending December 31, 2022, the Company is required to capitalize research and development expenses, as defined under section 174 of the Internal Revenue Code of 1986, as amended. For expenses that are incurred for research and development in the United States, the amounts will be amortized over 5 years, and expenses that are incurred for research and experimentation outside the United States will be amortized over 15 years. The Company already capitalizes its research and development expenses for income tax purposes as it is a start-up company, so there is no material impact forecasted for this change in legislation in 2022.

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Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Accounting Policies [Abstract]

Schedule of Cash, Cash Equivalents and Restricted Cash

As of March 31, 2022, the Company classified $182,000 as restricted cash related to a letter of credit issued as a security deposit in connection with the Company’s lease of its corporate office facilities (Note 11). Cash, cash equivalents and restricted cash consists of the following (in thousands):

	December 31, 2021		March 31, 2022
Cash and cash equivalents	$	74,268	$	51,630
Restricted cash		182		182
Cash, cash equivalents and restricted cash	$	74,450	$	51,812

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Net Loss per Share (Tables)

3 Months Ended

Mar. 31, 2022

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Loss Per Share of Common Stock

The following table sets forth the computation of basic and diluted net loss per share of common stock (in thousands, except share and per share data):

	Three Months Ended March 31,
	2021			2022
Net loss	$	(7,102	)	$	(7,731	)
Weighted-average shares used in computing net loss per share		27,336,724			27,368,354
Net loss per share, basic and diluted	$	(0.26	)	$	(0.28	)

Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share

The Company’s potentially dilutive securities, which include stock options and unvested restricted stock units, have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share. Therefore, the weighted average number of common shares outstanding used to calculate both basic and diluted net loss per share attributable to common stockholders is the same. The Company excluded the following potential common shares, presented based on amounts outstanding at each period end, from the computation of diluted net loss per share attributable to common stockholders for the periods indicated because including them would have had an anti-dilutive effect.

	Three Months Ended March 31,
	2021		2022
Stock options to purchase common stock		2,805,029		3,442,152
Unvested restricted stock units		42,250		42,250
Total		2,847,279		3,484,402

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Investments (Tables)

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Summary of Available-for-Sale Classified Investments

A summary of the Company’s available-for-sale classified investments as of December 31, 2021 and March 31, 2022 consisted of the following (in thousands):

	At December 31, 2021
Investments - Current:	Cost Basis		Accumulated Unrealized Gains		Accumulated Unrealized Losses			Fair Value
Corporate debt securities	$	1,011	$	-	$	(1	)	$	1,010
Total	$	1,011	$	-	$	(1	)	$	1,010

	At March 31, 2022
Investments - Current:	Cost Basis		Accumulated Unrealized Gains		Accumulated Unrealized Losses			Fair Value
United States Treasury securities	$	8,987	$	-	$	(1	)	$	8,986
Corporate debt securities		2,813		-		(3	)		2,810
Commercial paper		1,992		-		-			1,992
Total	$	13,792	$	-	$	(4	)	$	13,788

Summary of Amortized Cost and Fair Value of Available-for-Sale Investments by Contract Maturity

The amortized cost and fair value of the Company’s available-for-sale investments, by contract maturity, as of March 31, 2022 consisted of the following (in thousands):

	Amortized Cost		Fair Value
Due in one year or less	$	13,792	$	13,788
Total	$	13,792	$	13,788

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Property and Equipment (Tables)

3 Months Ended

Mar. 31, 2022

Property, Plant and Equipment [Abstract]

Schedule of Purchased Property and Equipment

Purchased property and equipment consist of the following (dollars in thousands):

	ESTIMATED USEFUL LIFE	December 31, 2021			March 31, 2022
Office equipment	5 years	$	10		$	6
Office furniture	7 years		126			126
Computer equipment	3 years		8			8
Leasehold improvements	Life of lease		95			95
			239			235
Less: Accumulated depreciation			(170	)		(169	)
Property and equipment, net		$	69		$	66

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Accrued Expenses (Tables)

3 Months Ended

Mar. 31, 2022

Accrued Liabilities, Current [Abstract]

Schedule of Accrued Expenses

Accrued expenses consist of the following (in thousands):

	December 31, 2021		March 31, 2022
Contract research and development	$	2,350	$	2,199
Employee compensation and related costs		1,152		707
Consulting and professional service fees		265		335
Interest		154		132
Financing related costs		60		60
State taxes		5		44
Other		9		-
Total accrued expenses	$	3,995	$	3,477

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Fair Value of Financial Instruments (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Summary of Assets Measured at Fair Value on Recurring Basis

The following tables summarize the Company’s assets that are measured at fair value on a recurring basis and indicates the level of the fair value hierarchy utilized to determine such fair values (in thousands):

	As of December 31, 2021
	TOTAL		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	72,449	$	72,449	$	—	$	—
Total cash equivalents		72,449		72,449		—		—
Corporate debt securities		1,010		—		1,010		—
Investments		1,010		—		1,010		—
Total	$	73,459	$	72,449	$	1,010	$	—
	As of March 31, 2022
	TOTAL		Quoted Prices in Active Markets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets:
Cash equivalents	$	49,666	$	47,866	$	1,800	$	—
Total cash equivalents		49,666		47,866		1,800		—
United States Treasury securities		8,986		8,986		—		—
Corporate debt securities		2,810		—		2,810
Commercial paper		1,992		—		1,992		—
Investments		13,788		8,986		4,802		—
Total	$	63,454	$	56,852	$	6,602	$	—

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Term Loan (Tables)

3 Months Ended

Mar. 31, 2022

Debt Disclosure [Abstract]

Schedule of Total Term Loan and Unamortized Debt Discount

Total term loan and unamortized debt discount balances are as follows (in thousands):

	March 31, 2022
Face value	$	15,000
Less: discount		(261	)
Total	$	14,739
Less: current portion		(9,826	)
Long-term portion	$	4,913

Schedule of Future Principal Payments Due

As of March 31, 2022, future principal payments due under the 2019 Loan Agreement are as follows (in thousands):

Year ended:
December 31, 2022	$	7,500
December 31, 2023		7,500
Total	$	15,000

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Stock-Based Compensation (Tables)

3 Months Ended

Mar. 31, 2022

Share-based Payment Arrangement [Abstract]

Schedule of Estimated Fair Value of Options Valuation Assumptions

The fair value of options at date of grant was estimated using the Black-Scholes option-pricing model with the following assumptions:

	Three Months Ended March 31,
	2021		2022
Risk-free interest rate	0.50% - 0.72%		1.67% - 1.90%
Expected dividend yield	0%		0%
Expected life	5.5-6.7 years		5.6-6.7 years
Expected volatility	72%-74%		70%-72%
Weighted-average grant date fair value	$	4.36	$	2.93

Summary of Information about Stock Option Activity

The following table summarizes information about stock option activity during the three months ended March 31, 2022 (in thousands, except share and per share data):

	NUMBER OF SHARES			WEIGHTED- AVERAGE EXERCISE PRICE		WEIGHTED- AVERAGE REMAINING CONTRACTUAL TERM		AGGREGATE INTRINSIC VALUE
Outstanding, December 31, 2021		2,662,752		$	6.28
Granted		795,119			4.61
Exercised		(4,781	)		4.42
Forfeited		(10,938	)		8.32
Outstanding, March 31, 2022		3,442,152		$	5.89		7.83	$	2,389
Vested and exercisable, March 31, 2022		1,582,865		$	6.18		6.33	$	1,356
Vested and expected to vest, March 31, 2022		2,777,959		$	5.95		7.52	$	1,997

Schedule of RSU Activity

The following table summarizes information about RSU activity during the three months ended March 31, 2022:

	RSUs		AVERAGE GRANT DATE FAIR VALUE (IN DOLLARS PER SHARE)
Outstanding, December 31, 2021		42,250	$	3.25
Granted		—		—
Vested		—		—
Forfeited		—		—
RSUs outstanding at March 31, 2022		42,250	$	3.25

Summary of Stock-Based Compensation Expense

The Company recorded stock-based compensation expense in the following expense categories of its accompanying condensed consolidated statements of operations and comprehensive loss for the three months ended March 31, 2021 and 2022 (in thousands):

	Three Months Ended March 31,
	2021		2022
Research and development	$	226	$	254
General and administrative		295		382
Total	$	521	$	636

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Commitments and Contingencies (Tables)

3 Months Ended

Mar. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Schedule of Maturity Analysis of Annual Undiscounted Cash Flows of Operating Lease Liabilities

The following is a maturity analysis of the annual undiscounted cash flows of the operating lease liabilities as of March 31, 2022 (in thousands):

Year ended:
December 31, 2022	$	369
December 31, 2023		9
December 31, 2024		9
December 31, 2025		1
Total minimum lease payments		388
Less imputed interest		(22	)
Total	$	366

Schedule of Lease Cost and Other Information of Operating Lease Liabilities

	Three Months Ended March 31,
	2021			2022
Lease cost:
Operating lease cost	$	122		$	118
Short-term lease cost		-			13
Sublease income		(13	)		(13	)
Total lease cost	$	109		$	118
Other information
Cash paid for amounts included in the measurement of lease liabilities	$	141		$	140
Operating cash flows from operating leases	$	(14	)	$	(18	)
Weighted-average remaining lease term - operating leases	1.7 years			0.8 years
Weighted-average discount rate - operating leases		10.1	%		10.1	%

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Description of Business and Basis of Presentation - Additional Information (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Accumulated deficit	$ (197,429)	$ (189,698)
Cash, cash equivalents, restricted cash, and short-term investments	$ 65,600

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Significant Accounting Policies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Accounting Policies [Line Items]
Restricted cash	$ 182,000	$ 182,000
Potential interest and penalties associated with uncertain tax positions, accruals	$ 0
Amortized period for expenses incurred for research and development in united states	5 years
Amortized period for expenses incurred for research and development outside united states	15 years
Letter of Credit
Schedule Of Accounting Policies [Line Items]
Restricted cash	$ 182,000

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Significant Accounting Policies - Schedule of Cash, Cash Equivalents and Restricted Cash (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]
Cash and cash equivalents	$ 51,630	$ 74,268
Restricted cash	182	182
Cash, cash equivalents and restricted cash	$ 51,812	$ 74,450	$ 76,019	$ 72,001

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Net Loss per Share - Computation of Basic and Diluted Net Loss Per Share of Common Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Earnings Per Share [Abstract]
Net loss	$ (7,731)	$ (7,102)
Weighted-average shares used in computing net loss per share	27,368,354	27,336,724
Net loss per share, basic and diluted	$ (0.28)	$ (0.26)

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Net Loss per Share - Schedule of Antidilutive Securities Excluded from Computation of Net Loss Per Share (Details) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	3,484,402	2,847,279
Stock Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	3,442,152	2,805,029
Unvested Restricted Stock Units
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from calculation of diluted net loss per share	42,250	42,250

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Investments - Summary of Available-for-Sale Classified Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Marketable Securities [Line Items]
Cost Basis	$ 13,792	$ 1,011
Accumulated Unrealized Gains	0	0
Accumulated Unrealized Losses	(4)	(1)
Fair Value	13,788	1,010
United States Treasury Securities
Marketable Securities [Line Items]
Cost Basis	8,987
Accumulated Unrealized Gains	0
Accumulated Unrealized Losses	(1)
Fair Value	8,986
Corporate Debt Securities
Marketable Securities [Line Items]
Cost Basis	2,813	1,011
Accumulated Unrealized Gains	0	0
Accumulated Unrealized Losses	(3)	(1)
Fair Value	2,810	$ 1,010
Commercial Paper
Marketable Securities [Line Items]
Cost Basis	1,992
Accumulated Unrealized Gains	0
Accumulated Unrealized Losses	0
Fair Value	$ 1,992

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Investments - Summary of Amortized Cost and Fair Value of Available-for-Sale Investments by Contract Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Due in one year or less	$ 13,792
Amortized Cost, Total	13,792	$ 1,011
Fair Value, Due in one year or less	13,788
Fair Value, Total	$ 13,788	$ 1,010

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Property and Equipment - Schedule of Purchased Property and Equipment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 235	$ 239
Less: Accumulated depreciation	(169)	(170)
Property and equipment, net	$ 66	69
Office Equipment
Property Plant And Equipment [Line Items]
ESTIMATED USEFUL LIFE	5 years
Property and equipment, gross	$ 6	10
Office Furniture
Property Plant And Equipment [Line Items]
ESTIMATED USEFUL LIFE	7 years
Property and equipment, gross	$ 126	126
Computer Equipment
Property Plant And Equipment [Line Items]
ESTIMATED USEFUL LIFE	3 years
Property and equipment, gross	$ 8	8
Leasehold Improvements
Property Plant And Equipment [Line Items]
ESTIMATED USEFUL LIFE	Life of lease
Property and equipment, gross	$ 95	$ 95

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Property and Equipment - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Property, Plant and Equipment [Abstract]
Depreciation expense	$ 9,000	$ 8,000

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Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Accrued Liabilities, Current [Abstract]
Contract research and development	$ 2,199	$ 2,350
Employee compensation and related costs	707	1,152
Consulting and professional service fees	335	265
Interest	132	154
Financing related costs	60	60
State taxes	44	5
Other		9
Total accrued expenses	$ 3,477	$ 3,995

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Fair Value of Financial Instruments - Summary of Assets Measured at Fair Value on Recurring Basis (Details) - Fair Value, Measurements, Recurring - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Assets:
Cash equivalents	$ 49,666	$ 72,449
Investments	13,788	1,010
Total	63,454	73,459
United States Treasury Securities
Assets:
Investments	8,986
Corporate Debt Securities
Assets:
Investments	2,810	1,010
Commercial Paper
Assets:
Investments	1,992
Quoted Prices in Active Markets (Level 1) [Member]
Assets:
Cash equivalents	47,866	72,449
Investments	8,986
Total	56,852	72,449
Significant Other Observable Inputs (Level 2) [Member]
Assets:
Cash equivalents	1,800
Investments	4,802
Total	6,602	1,010
Significant Other Observable Inputs (Level 2) [Member] | Corporate Debt Securities
Assets:
Investments	2,810	$ 1,010
Significant Other Observable Inputs (Level 2) [Member] | Commercial Paper
Assets:
Investments	$ 1,992

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Term Loan - Additional Information (Details) - SLR Investment Corp. and Silicon Valley Bank - USD ($)	1 Months Ended	3 Months Ended
	Sep. 30, 2019	Mar. 31, 2022	Mar. 31, 2021	May 31, 2017
2017 Loan Agreement
Debt Instrument [Line Items]
Unpaid borrowings				$ 10,000,000.0
2019 Loan Agreement
Debt Instrument [Line Items]
Loan agreement, maturity date	Sep. 17, 2023
Debt instrument, interest rate terms		The interest rate under the 2019 Loan Agreement is the higher of (i) LIBOR plus 7.95% or (ii) 10.18%
Debt instrument, effective interest rate		10.18%
Exit fee, percentage		4.00%
Exit fee		$ 800,000
Unpaid borrowings	$ 20,000,000.0	15,000,000
Amortization of debt discount		$ 80,000	$ 87,000
Prepayment premium percentage after year two		0.50%
Final payment fee		$ 500,000
Amortization of final payment fee		$ 34,000	$ 40,000
Increase in interest rate on default		5.00%
2019 Loan Agreement | Minimum
Debt Instrument [Line Items]
Interest rate, minimum		10.18%
Prepayment premium percentage two		0.01
2019 Loan Agreement | Maximum
Debt Instrument [Line Items]
Prepayment premium percentage one		0.03
2019 Loan Agreement | Libor
Debt Instrument [Line Items]
Basis spread on variable base rate		7.95%

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Term Loan - Schedule of Total Term Loan and Unamortized Debt Discount (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2019
Debt Instrument [Line Items]
Less: current portion	$ (9,826)	$ (9,805)
Long-term portion	4,913	$ 7,354
2019 Loan Agreement | SLR Investment Corp. and Silicon Valley Bank
Debt Instrument [Line Items]
Loan and security agreement, amount	15,000		$ 20,000
Less: discount	(261)
Total	14,739
Less: current portion	(9,826)
Long-term portion	$ 4,913

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Term Loan - Schedule of Future Principal Payments Due (Details) - 2019 Loan Agreement - SLR Investment Corp. and Silicon Valley Bank - USD ($) $ in Thousands	Mar. 31, 2022	Sep. 30, 2019
Debt Instrument [Line Items]
December 31, 2022	$ 7,500
December 31, 2023	7,500
Total	$ 15,000	$ 20,000

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Stockholders' Equity - Additional Information (Details) - 2021 ATM Agreement - Cowen - Common Stock - USD ($)		3 Months Ended
	Mar. 23, 2021	Mar. 31, 2022
Stockholders Equity Note [Line Items]
Proceeds from sale of shares,Net		$ 0
Maximum
Stockholders Equity Note [Line Items]
Aggregate offering price	$ 50,000,000.0
Percentage of commission on gross sales proceeds	3.00%

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Stock-Based Compensation - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional options granted	795,119
Stock option, number of shares outstanding	3,442,152	2,662,752
Unrecognized compensation expense	$ 3,800,000
Recognition period (in years)	2 years 7 months 6 days
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Unrecognized compensation expense	$ 18,000
Recognition period (in years)	6 months
2017 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option and incentive plan effective date	Nov. 30, 2017
Stock option and incentive plan expiration date	Oct. 31, 2027
Stock option, number of shares outstanding	2,843,533
Number of common shares authorized for issuance	6,143,876
Stock options, available for issuance	3,228,289
Term of option granted	10 years
2017 Stock Plan | Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option vesting term	1 year
2017 Stock Plan | Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option vesting term	4 years
2017 Stock Plan | Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of restricted stock units outstanding	42,250
2014 Stock Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Additional options granted	0
Stock option and incentive plan expiration date	Nov. 30, 2017
Stock option, number of shares outstanding	598,619
Number of options forfeited	359,652
2017 Employee Stock Purchase Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of common stock shares available for issuance	1,188,629

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Stock-Based Compensation - Schedule of Estimated Fair Value of Options Valuation Assumptions (Details) - $ / shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Risk-free interest rate, minimum	1.67%	0.50%
Risk-free interest rate, maximum	1.90%	0.72%
Expected dividend yield	0.00%	0.00%
Expected volatility, minimum	70.00%	72.00%
Expected volatility, maximum	72.00%	74.00%
Weighted-average grant date fair value	$ 2.93	$ 4.36
Minimum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected life	5 years 7 months 6 days	5 years 6 months
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected life	6 years 8 months 12 days	6 years 8 months 12 days

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Stock-Based Compensation - Summary of Information about Stock Option Activity (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) $ / shares shares
NUMBER OF SHARES
Number of shares outstanding, beginning balance | shares	2,662,752
Additional options granted | shares	795,119
Number of shares exercised | shares	(4,781)
Number of shares forfeited | shares	(10,938)
Number of shares outstanding, ending balance | shares	3,442,152
Vested and exercisable, ending balance | shares	1,582,865
Vested and expected to vest, ending balance | shares	2,777,959
WEIGHTED-AVERAGE EXERCISE PRICE
Weighted average exercise prices, outstanding beginning balance | $ / shares	$ 6.28
Weighted average exercise prices, granted | $ / shares	4.61
Weighted average exercise prices, exercised | $ / shares	4.42
Weighted average exercise prices, forfeited | $ / shares	8.32
Weighted average exercise prices, outstanding ending balance | $ / shares	5.89
Weighted average exercise prices, vested and exercisable ending balance | $ / shares	6.18
Weighted average exercise prices, vested and expected to vest ending balance | $ / shares	$ 5.95
WEIGHTED-AVERAGE REMAINING CONTRACTUAL TERM
Weighted average remaining contractual term, outstanding	7 years 9 months 29 days
Weighted average remaining contractual term, vested and exercisable	6 years 3 months 29 days
Weighted average remaining contractual term, vested and expected to vest	7 years 6 months 7 days
AGGREGATE INTRINSIC VALUE
Aggregate intrinsic value, outstanding ending balance | $	$ 2,389
Aggregate intrinsic value, vested and exercisable ending balance | $	1,356
Aggregate intrinsic value, vested and expected to vest ending balance | $	$ 1,997

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Stock-Based Compensation - Schedule of RSU Activity (Details) - Restricted Stock Units (RSUs)	3 Months Ended
	Mar. 31, 2022 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
RSUs Outstanding, December 31, 2021 | shares	42,250
RSUs Granted | shares	0
RSUs Vested | shares	0
RSUs Forfeited | shares	0
RSUs outstanding at March 31, 2022 | shares	42,250
AVERAGE GRANT DATE FAIR VALUE, Outstanding, December 31, 2021 | $ / shares	$ 3.25
AVERAGE GRANT DATE FAIR VALUE, Granted | $ / shares	0
AVERAGE GRANT DATE FAIR VALUE, Vested | $ / shares	0
AVERAGE GRANT DATE FAIR VALUE, Forfeited | $ / shares	0
AVERAGE GRANT DATE FAIR VALUE, RSUs outstanding at March 31, 2022 | $ / shares	$ 3.25

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Stock-Based Compensation - Summary of Stock Based Compensation Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 636	$ 521
Research and Development
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	254	226
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total stock-based compensation expense	$ 382	$ 295

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Commitments and Contingencies - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Dec. 31, 2021
Commitments And Contingencies [Line Items]
Operating leases expire	2025
Restricted cash	$ 182,000	$ 182,000
Short-term lease asset	318,000	410,000
Short-term lease liability	356,000	$ 476,000
Short-term Leases Recognized on Straight-line Basis
Commitments And Contingencies [Line Items]
Short-term lease asset	0
Short-term lease liability	0
Letter of Credit
Commitments And Contingencies [Line Items]
Restricted cash	182,000
Letter of Credit | Lease Agreement Require Standby Letter of Credit
Commitments And Contingencies [Line Items]
Restricted cash	$ 182,000

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Commitments and Contingencies - Schedule of Maturity Analysis of Annual Undiscounted Cash Flows of Operating Lease Liabilities (Details) $ in Thousands	Mar. 31, 2022 USD ($)
Year ended:
December 31, 2022	$ 369
December 31, 2023	9
December 31, 2024	9
December 31, 2025	1
Total minimum lease payments	388
Less imputed interest	(22)
Total	$ 366

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Commitments and Contingencies - Schedule of Lease Cost and Other Information of Operating Lease Liabilities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Lease cost:
Operating lease cost	$ 118	$ 122
Short-term lease cost	13	0
Sublease income	(13)	(13)
Total lease cost	118	109
Other information
Cash paid for amounts included in the measurement of lease liabilities	140	141
Operating cash flows from operating leases	$ (18)	$ (14)
Weighted-average remaining lease term - operating leases	9 months 18 days	1 year 8 months 12 days
Weighted-average discount rate - operating leases	10.10%	10.10%

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Subsequent Events - Additional Information (Details) - USD ($)	Apr. 11, 2022	Mar. 31, 2022
Subsequent Event [Line Items]
Future minimum lease payments		$ 388,000
Subsequent Events | Burlington, Massachusetts
Subsequent Event [Line Items]
Operating leases expiration date	Nov. 30, 2023
Lease term	12 months
Future minimum lease payments	$ 640,000