0001564590-23-001729 | 10-K | XBRL Viewer

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Document and Entity Information - USD ($)	12 Months Ended
Document and Entity Information - USD ($)	Dec. 31, 2022	Feb. 06, 2023	Jun. 30, 2022
Cover [Abstract]
Entity Registrant Name	IMARA INC.
Document Type	10-K
Trading Symbol	IMRA
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		26,233,901
Entity Public Float			$ 20,818,052
Amendment Flag	false
Entity Central Index Key	0001672619
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Dec. 31, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	FY
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false
Title of 12(b) Security	Common stock, par value $0.001 per share
Security Exchange Name	NASDAQ
Entity File Number	001-39247
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	81-1523849
Entity Address, Address Line One	309 Beacon Street,
Entity Address, Address Line Two	Suite 300
Entity Address, Address Line Three	Office 341
Entity Address, City or Town	Brookline
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02446
City Area Code	617
Local Phone Number	927-9989
Document Annual Report	true
Document Transition Report	false
ICFR Auditor Attestation Flag	false
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Auditor Name	Ernst & Young LLP
Auditor Firm ID	42
Auditor Location	Boston, Massachusetts
Documents Incorporated by Reference	Portions of the registrant’s definitive proxy statement for its 2023 Annual Meeting of Stockholders, which the registrant intends to file with the Securities and Exchange Commission pursuant to Regulation 14A within 120 days after the end of the registrant’s fiscal year ended December 31, 2022, are incorporated by reference into Part III of this Annual Report on Form 10-K.

Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets:
Cash and cash equivalents	$ 88,198	$ 48,309
Short-term investments		41,969
Prepaid expenses and other current assets	1,438	2,418
Total current assets	89,636	92,696
Property and equipment, net		250
Right of use assets - operating leases		525
Other assets	2,323	175
Total assets	91,959	93,646
Current liabilities:
Accounts payable	149	2,360
Accrued expenses and other current liabilities	1,681	4,604
Operating lease liability, current		246
Total current liabilities	1,830	7,210
Operating lease liability, non-current		406
Total liabilities	1,830	7,616
Commitments and contingencies (Note 8)
Stockholders' equity:
Preferred stock, $0.001 par value per share; 10,000,000 shares authorized; no shares issued or outstanding as of December 31, 2022 and December 31, 2021
Common stock, par value of $0.001 per share; 200,000,000 shares authorized; 26,287,264 shares issued and outstanding as of December 31, 2022 and 2021	27	27
Additional paid-in capital	236,111	233,516
Accumulated other comprehensive (loss) income		(16)
Accumulated deficit	(146,009)	(147,497)
Total stockholders' equity	90,129	86,030
Total liabilities and stockholders’ equity	$ 91,959	$ 93,646

Consolidated Balance Sheets (Parenthetical) - $ / shares	Dec. 31, 2022	Dec. 31, 2021
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.001	$ 0.001
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	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000
Common stock, shares issued	26,287,264	26,287,264
Common stock, shares outstanding	26,287,264	26,287,264

Consolidated Statements of Operations and Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating expenses:
Research and development	$ 18,940	$ 38,442
General and administrative	15,330	13,000
Total operating expenses	34,270	51,442
Gain on Asset Sale	35,000
Income (loss) from operations	730	(51,442)
Total other income, (net):
Interest income	943	233
Other income (expense)	(97)	(175)
Total other income, (net)	846	58
Net income (loss) before income tax provision	1,576	(51,384)
Income tax provision	88
Net income (loss) attributable to common stockholders—basic and diluted	$ 1,488	$ (51,384)
Net income (loss) per share applicable to common stockholders—basic	$ 0.06	$ (2.37)
Net income (loss) per share applicable to common stockholders—diluted	$ 0.06	$ (2.37)
Weighted-average common shares outstanding—basic	26,287,264	21,661,450
Weighted-average common shares outstanding—diluted	26,385,567	21,661,450
Comprehensive income (loss):
Net income (loss)	$ 1,488	$ (51,384)
Other comprehensive income (loss):
Unrealized gain (loss) on investments		(20)
Realized gain (loss) on investments	16
Comprehensive income (loss)	$ 1,504	$ (51,404)

Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($) $ in Thousands	Total	July 2021 Offering	COMMON STOCK	COMMON STOCK July 2021 Offering	ADDITIONAL PAID-IN CAPITAL	ADDITIONAL PAID-IN CAPITAL July 2021 Offering	ACCUMULATED OTHER COMPREHENSIVE INCOME (LOSS)	ACCUMULATED DEFICIT
Beginning balance at Dec. 31, 2020	$ 84,435		$ 18		$ 180,526		$ 4	$ (96,113)
Beginning balance, shares at Dec. 31, 2020			17,548,263
Issuance of common stock under ATM offering, net of issuance costs		$ 48,240		$ 9		$ 48,231
Issuance of common stock under ATM offering, net of issuance costs, shares				8,564,624
Exercise of stock options and issuance of stock under the Employee Stock Purchase Plan	914				914
Exercise of stock options and issuance of stock under the Employee Stock Purchase Plan, shares			174,377
Stock-based compensation expense	3,845				3,845
Unrealized gain (loss) on investments	(20)						(20)
Net income (loss)	(51,384)							(51,384)
Ending balance at Dec. 31, 2021	86,030		$ 27		233,516		(16)	(147,497)
Ending balance, shares at Dec. 31, 2021			26,287,264
Stock-based compensation expense	2,595				2,595
Realized gain (loss) on investments	16						$ 16
Net income (loss)	1,488							1,488
Ending balance at Dec. 31, 2022	$ 90,129		$ 27		$ 236,111			$ (146,009)
Ending balance, shares at Dec. 31, 2022			26,287,264

Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (Parenthetical) $ in Thousands	12 Months Ended
	Dec. 31, 2021 USD ($)
July 2021 Offering
Stock issuance costs	$ 579

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Cash flows from operating activities:
Net income (loss)	$ 1,488	$ (51,384)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Stock-based compensation expense	2,595	3,845
Depreciation expense	611	99
Amortization and accretion on investments	109	155
Non-cash lease expense	(11)
Gain on Asset Sale	(35,000)
Changes in operating assets and liabilities:
Prepaid expenses and other current assets	980	(235)
Accounts payable	(2,213)	389
Accrued expenses and other current liabilities	(4,013)	393
Operating lease assets and liabilities, net	(114)	(33)
Net cash used in operating activities	(35,568)	(46,771)
Cash flows from investing activities:
Proceeds from maturities and sales of short-term investments	41,878	45,937
Proceeds from Asset Sale	35,000
Purchases of short-term investments		(47,557)
Purchases of property and equipment	(363)	(12)
Net cash provided by (used in) investing activities	76,515	(1,632)
Cash flows from financing activities:
Proceeds from July 2021 Offering, net of underwriting discounts and commissions		47,000
Proceeds from ATM offering, net of underwriting discounts and commissions		1,819
Proceeds from exercise of options		860
Payment of transaction costs	(1,233)	(578)
Net cash (used in) provided by financing activities	(1,233)	49,101
Net increase in cash, cash equivalents and restricted cash	39,714	698
Cash, cash equivalents and restricted cash, beginning of period	48,484	47,786
Cash, cash equivalents and restricted cash, end of period	88,198	48,484
Supplemental disclosure of non-cash investing and financing activities:
Offering costs included in accounts payable and accrued expenses	1,090	1
Right of use asset obtained in exchange for lease liabilities	1,886
Unrealized gain (loss) on investments		$ (20)
Realized gain (loss) on investments	$ 16

Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Statement Of Cash Flows [Abstract]
Cash and cash equivalents	$ 88,198	$ 48,309
Restricted cash (included in other assets)		175
Total cash, cash equivalents and restricted cash	$ 88,198	$ 48,484	$ 47,786

Nature of the Business

12 Months Ended

Dec. 31, 2022

Organization Consolidation And Presentation Of Financial Statements [Abstract]

Nature of the Business

1. Nature of the Business

IMARA Inc. (“IMARA” or the “Company”) is a biopharmaceutical company that has been dedicated to developing and commercializing novel therapeutics to treat patients suffering from serious diseases. The Company was incorporated in January 2016 under the laws of the State of Delaware, and its principal offices are in Brookline, Massachusetts.

On April 5, 2022, the Company announced the results from interim analyses of its Ardent Phase 2b clinical trial of tovinontrine (IMR-687) in patients with sickle cell disease (“SCD”) and Forte Phase 2b clinical trial of tovinontrine in patients with ß-thalassemia. Based on the data generated by these interim analyses, the Company decided to discontinue the Ardent and Forte trials as well as the further development of tovinontrine in SCD and ß-thalassemia. The Company also decided to discontinue development of tovinontrine in heart failure with preserved ejection fraction, as well as its development plans with respect to IMR-261. In connection with these events, the Company’s Board of Directors approved a reduction in workforce designed to substantially reduce the Company’s operating expenses while it undertakes a comprehensive assessment of its strategic options to maximize stockholder value. The workforce reduction was completed as of September 30, 2022 and the Company incurred approximately $2.1 million of expenses comprised of notice and employee severance and retention payments.

On September 6, 2022, the Company entered into an Asset Purchase Agreement (the “Asset Purchase Agreement”) with Cardurion Pharmaceuticals, Inc. (“Cardurion”), discussed further in Note 7, providing for the sale of tovinontrine and all other assets of the Company related to its PDE9 program (the “Asset Sale”) in exchange for a $35.0 million upfront payment and future contingent payments. The Company completed the Asset Sale on November 10, 2022.

On October 13, 2022, the Company, Iguana Merger Sub, Inc., a Delaware corporation and a wholly-owned subsidiary of the Company (“Merger Sub”), and Enliven Therapeutics, Inc., a Delaware corporation (“Enliven”), entered into an Agreement and Plan of Merger (the “Merger Agreement”), pursuant to which, among other matters, and subject to the satisfaction or waiver of the conditions set forth in the Merger Agreement, Merger Sub will merge with and into Enliven, with Enliven continuing as a wholly owned subsidiary of IMARA and the surviving corporation of the merger (the “Merger”). If the Merger is completed, the business of Enliven will continue as the business of the combined organization. Consummation of Merger Agreement is subject to customary closing conditions, including, without limitation, approval of the sale by the Company’s stockholders.

Liquidity

The Company has incurred recurring negative operating cash flows since inception and has funded its operations primarily from the sale of convertible preferred stock and proceeds from the IPO and subsequent common stock offerings. As of December 31, 2022, the Company had cash and cash equivalents of $88.2 million and an accumulated deficit of $146.0 million. The Company expects to incur operating losses and negative operating cash flows to in the foreseeable future.

On April 1, 2021, the Company filed a Registration Statement on Form S-3 (the “Shelf”) with the SEC in relation to the registration and potential future issuance of common stock, preferred stock, debt securities, warrants and/or units of any combination thereof in the aggregate amount of up to $200.0 million. The Shelf was declared effective on April 8, 2021. The Company also simultaneously entered into a sales agreement with Cantor Fitzgerald & Co, LLC, as sales agent, providing for the offering, issuance and sale by the Company of up to an aggregate $75.0 million of its common stock from time to time in “at-the-market” offerings under the Shelf. As of December 31, 2022, the Company had issued and sold 231,291 shares of common stock under the sales agreement, resulting in net proceeds of $1.4 million after deducting commissions and offering expenses. No sales were made under the sales agreement during the twelve months ended December 31, 2022.

On July 16, 2021, the Company completed a public offering of shares of its common stock. In connection with the offering, the Company issued and sold 8,333,333 shares of common stock at a public offering price of $6.00 per share, resulting in net proceeds of $46.8 million after deducting underwriting discounts and commissions and offering expenses.

As described above, the Company made the decision to discontinue development of tovinontrine in sickle cell disease, β-thalassemia and heart failure with preserved ejection fraction, as well to discontinue its development plans with respect to

IMR-261. As a result, the Company believes its cash and cash equivalents as of December 31, 2022 will be sufficient to fund its operating expense requirements for at least twelve months from the date of filing of this Annual Report on Form 10-K.

In the event that the Company does not complete the Merger, the Company (i) may elect to pursue a dissolution and liquidation of the Company, (ii) may pursue another strategic transaction or (iii) may resume research and development activities. If the Company decides to pursue any future product development efforts, it will need additional funding to support its planned operating activities. There can be no assurances, however, that the current operating plan will be achieved or that additional funding will be available on terms acceptable to the Company, or at all.

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Summary of Significant Accounting Policies

2. Summary of Significant Accounting Policies

Basis of presentation

The accompanying consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”). Any reference in these notes to applicable guidance is meant to refer to the authoritative GAAP as found in the Accounting Standards Codification (“ASC”) and as amended by Accounting Standards Updates of the FASB.

Principles of Consolidation

The accompanying consolidated financial statements of the Company include the accounts of its wholly owned subsidiaries, Iguana Merger Sub, Inc., IMARA Security Corporation and IMARA E.U. Limited, the latter of which was dissolved in July 2021. All intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates

The preparation of consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected in these consolidated financial statements include, but are not limited to, accrued research and development expenses, and stock-based compensation expense. Actual results could differ materially from those estimates.

Segments

Operating segments are defined as components of an enterprise for which separate and discrete information is available for evaluation by the chief operating decision-maker in deciding how to allocate resources and assess performance. The Company has one operating segment. The Company’s chief operating decision maker, its Chief Executive Officer, manages the Company’s operations on a consolidated basis for the purpose of allocating resources. All of the Company’s long-lived assets are held in the United States.

Cash and Cash Equivalents

The Company considers all highly liquid investments that are readily convertible into cash with original maturities of three months or less from the date of purchase to be cash equivalents. Cash and cash equivalents include cash held in banks and amounts held in money market funds. Cash equivalents are stated at cost, which approximates market value.

Restricted Cash

Restricted cash of $0.2 million as of December 31, 2021 represents a letter of credit held as collateral in support of the Company’s operating lease at 116 Huntington Avenue in Boston, Massachusetts, which was terminated in July 2022. Restricted cash is included as a component of other assets on the Company’s consolidated balance sheets.

Investments

The Company’s investments are maintained by investment managers and consist of corporate debt securities and commercial paper with original maturities of over 90 days, all of which are considered available-for-sale securities. The Company classifies its available-for-sale securities as short-term investments on the consolidated balance sheets, even though the stated maturity date may be one year or more beyond the current balance sheet date, as the Company views those securities as available for use in current operations, if needed.

Available-for-sale securities are carried at fair value with their unrealized gains and losses included in accumulated other comprehensive income within stockholders’ equity (deficit), until such gains and losses are realized in other income (expense) within the consolidated statements of operations and comprehensive loss or until an unrealized loss is considered other-than-temporary.

The Company evaluates its investments with unrealized losses for other-than-temporary impairment. When assessing investments for other-than-temporary declines in value, the Company considers such factors as, among other things, how significant the decline in value is as a percentage of the original cost, how long the market value of the investment has been less than its original cost, the Company’s ability and intent to retain the investment for a period of time sufficient to allow for any anticipated recovery in fair value and market conditions. If the Company determines from this analysis that it does not expect to receive cash flows sufficient to recover the entire amortized cost of the security, a credit loss exists, the impairment is considered other-than-temporary and is recognized in the consolidated statements of operations and comprehensive loss.

Offering Costs

The Company capitalizes certain legal, professional, accounting and other third-party fees that are directly associated with in-process equity issuances as deferred offering costs until such equity issuances are consummated. After consummation of the equity issuance, these costs are recorded as a reduction in the capitalized amount associated with the equity issuance. Should the equity issuance be abandoned, the deferred offering costs will be expensed immediately as a charge to operating expenses in the consolidated statement of operations and comprehensive loss. There were $2.3 million of deferred offering costs capitalized and included in other assets on our consolidated balance sheet as of December 31, 2022.No deferred offering costs were capitalized as of December 31, 2021.

Concentrations of Credit Risk and Off-Balance Sheet Risk

Financial instruments that potentially expose the Company to concentrations of credit risk consist primarily of cash, cash equivalents and investments. Periodically, the Company maintains deposits in accredited financial institutions in excess of federally insured limits. The Company deposits its cash in financial institutions that it believes have high credit quality and have not experienced any losses on such accounts and does not believe it is exposed to any unusual credit risk beyond the normal credit risk associated with commercial banking relationships. Such deposits have and will continue to exceed federally insured limits. The Company has not experienced any losses on its cash deposits. The Company’s available-for-sale investments primarily consist of high-grade corporate debt and commercial paper, and potentially subject the Company to concentrations of credit risk. 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 be highly rated, thereby reducing credit risk exposure.

As of December 31, 2022 and 2021, the Company had no off-balance sheet risk such as foreign exchange contracts, option contracts, or other hedging arrangements.

Comprehensive Income (Loss)

Comprehensive income (loss) includes net loss and certain changes in stockholders’ equity that are excluded from net loss. For the years ended December 31, 2022 and 2021, as a result of the Company’s investments in available-for-sale securities, the Company’s comprehensive income (loss) includes unrealized losses on those available-for-sale securities.

Fair Value Measurements

Certain assets and liabilities of the Company are carried at fair value under GAAP. Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. Valuation techniques used to measure fair value must maximize the use of observable inputs and minimize the use of unobservable inputs. Financial assets and liabilities carried at fair value are to be classified and disclosed in one of the following three levels of the fair value hierarchy, of which the first two are considered observable and the last is considered unobservable:

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

•

Level 2—Observable inputs (other than Level 1 quoted prices), such as quoted prices in active markets for similar assets or liabilities, quoted prices in markets that are not active for identical or similar assets or liabilities, or other inputs that are observable or can be corroborated by observable market data.

•

Level 3—Unobservable inputs that are supported by little or no market activity that are significant to determining the fair value of the assets or liabilities, including pricing models, discounted cash flow methodologies and similar techniques.

To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. 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.

An entity may choose to measure many financial instruments and certain other items at fair value at specified election dates. Subsequent unrealized gains and losses on items for which the fair value option has been elected will be reported in earnings.

The carrying amounts reflected in the consolidated balance sheets for prepaid expenses and other current assets, accounts payable and accrued expenses approximate their fair values due to their short-term nature of these assets and liabilities.

Property and Equipment, Net

Property and equipment is stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets, which are as follows:

		Estimated Useful Life
Computer equipment and software		3 years
Furniture and fixtures		5 years
Laboratory equipment		5 years
Leasehold improvements		Shorter of useful life or remaining lease term

Purchased assets that are not yet in service are recorded to construction-in-process and no depreciation expense is recorded. Once they are placed in service they are reclassified to the appropriate asset class. Upon the retirement or sale of an asset, the related cost and accumulated depreciation is removed from the accounts and any resulting gain or loss is recorded to other income (expense), net. Expenditures for maintenance and repairs are expensed as incurred.

Leases

In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) (“ASU 2016-02”). This standard established a right-of-use model that requires all lessees to recognize on their balance sheets right-of-use assets and lease liabilities that arise from leases as well as provide disclosures with respect to certain qualitative and quantitative information related to a company’s leasing arrangements to meet the objective of allowing users of financial statements to assess the amount, timing and uncertainty of cash flows arising from leases. The FASB subsequently issued the following amendments to ASU 2016-02 that have the same effective date and transition date: ASU No. 2018-01, Leases (Topic 842): Land Easement Practical Expedient for Transition to Topic 842, ASU No. 2018-10, Codification Improvements to Topic 842, Leases, ASU No. 2018-11, Leases (Topic 842): Targeted Improvements, ASU No. 2018-20, Narrow-Scope Improvement for Lessors, and ASU No. 2019-01, Leases (Topic 842): Codification Improvements. The Company early adopted these amendments with ASU 2016-02 (collectively, the “new leasing standards”), effective January 1, 2021.

The Company adopted the new leasing standards using the modified retrospective transition approach, with no restatement of prior periods and there was no cumulative adjustment to retained earnings. Upon adoption, the Company elected the package of transition practical expedients, which allowed the Company to not reassess the following: (i) whether any expired or existing contracts are or contain leases, (ii) the lease classification for any expired or existing leases and (iii) the treatment of initial direct costs for existing leases. The Company made an accounting policy election to not recognize short-term leases with an initial term of twelve months or less within its consolidated balance sheets and to recognize those lease payments on a straight-line basis in its consolidated statements of operations over the lease term. Upon adopting the new leasing standards, the Company recognized an operating lease right-of-use asset of $0.7 million and a corresponding

current and non-current operating lease liability of $0.3 million and $0.6 million, respectively, which are included in its consolidated balance sheets. The adoption of the new leasing standards did not have a material impact on the Company’s consolidated statements of operations.

As further discussed in Note 8, the Company terminated its sole office lease, effective August 7, 2022. Prior to such termination, the Company’s operating leases were reflected in operating lease right-of-use assets and in current operating lease liabilities and long-term operating lease liabilities in its consolidated balance sheets. The Company’s operating lease right-of-use asset as of December 31, 2021 did not include any material lease incentives. Prior to the termination of the office lease, the lease expense for future lease payments was recognized on a straight-line basis over the lease term.

Research and Development Expenses

Research and development costs are expensed as incurred. Research and development expenses consist of costs incurred in performing research and development activities, including salaries, stock-based compensation and benefits, facilities costs, depreciation, third-party license fees, and external costs of outside vendors engaged to conduct preclinical development activities and clinical trials as well as to manufacture research and development materials. Non-refundable prepayments for goods or services that will be used or rendered for future research and development activities are deferred and capitalized. Such amounts are expensed as the goods are delivered or the related services are performed or until it is no longer expected that the goods will be delivered, or the services rendered.

Costs incurred in obtaining technology licenses are recognized as research and development expense as incurred if the technology licensed has not reached technological feasibility and has no alternative future uses.

As of December 31, 2022, the Company had discontinued its research and development efforts while undertaking a comprehensive assessment of its strategic options to maximize stockholder value.

Accrued Research and Development Expenses

The Company has entered into various research and development related contracts with parties both inside and outside of the United States, including contracts with third-party contract research organizations and contract manufacturing organizations. These agreements are cancelable, and related payments are recognized as research and development expenses as incurred. The Company records accrued liabilities for estimated ongoing research costs. When evaluating the adequacy of the accrued liabilities, the Company analyzes the progress of the studies or clinical trials, including the phase or completion of events, invoices received and contracted costs. Significant judgments and estimates are made in determining the accrued balances at the end of any reporting period. Actual results could differ from the Company’s estimates. To date, the Company’s historical accrual estimates have not been materially different from the actual costs.

Patent Costs

All patent-related costs incurred in connection with filing and prosecuting patent applications are expensed as incurred due to the uncertainty about the recovery of the expenditure and are classified as general and administrative expenses. Following the completion of the Asset Sale and discontinuation of IMR-261, as of December 31, 2022 the Company had ceased active prosecution of patents and patent applications.

Stock-Based Compensation

The Company accounts for all stock-based awards granted to employees and non-employees as stock-based compensation expense at fair value. For stock-based awards issued to employees and members of the Company’s board of directors (the “Board”) for their services as a member of the Board, the Company measures the estimated fair value of the stock-based award on the date of grant.

Since the Company’s initial public offering in March 2020, the fair value of the common stock has been determined based on the closing price of the Company’s stock on the Nasdaq Global Select Market on the date of grant. Prior to the Company’s initial public offering, the Company determined the fair value of the underlying common stock based on input from management and approved by the Board, which utilized the valuation of the Company’s enterprise value determined utilizing various methods including the back-solve method, the option-pricing method (“OPM”) or a hybrid of the probability-weighted expected return method (“PWERM”) and the OPM. The total enterprise value was then allocated to the various outstanding equity instruments, including the underlying common stock, utilizing the OPM.

For employee and non-employee awards, the Company recognizes compensation expense over the requisite service period, which is generally the vesting period of the respective award based on the grant date fair value of the award. For awards that include performance-based vesting conditions expense is recognized using the accelerated attribution method when the performance condition is deemed to be probable. The Company accounts for forfeitures as they occur. The Company determines the fair value of restricted stock awards in reference to the fair value of its common stock less any applicable purchase price.

The fair value of each stock option grant is estimated on the date of grant using the Black-Scholes option-pricing model, which requires inputs based on certain subjective assumptions, including the expected stock price volatility, the expected term of the option, the risk-free interest rate for a period that approximates the expected term of the option and the Company’s expected dividend yield. The fair value of each restricted stock award is determined on the date of grant based on the fair value of the Company’s common stock on that same date. Given the Company’s limited trading history as a public company, the Company determines the volatility for awards granted based on an analysis of reported data for a group of guideline companies that issued options with substantially similar terms. The expected volatility has been determined using a weighted-average of the historical volatility measures of this group of guideline companies. The Company expects to continue to do so until such time as it has adequate historical data regarding the volatility of its own traded stock price. The expected term of the Company’s stock options granted to employees has been determined utilizing the “simplified” method for awards that qualify as “plain-vanilla” options. Under the simplified method, the expected term is presumed to be the midpoint between the vesting date and the end of the contractual term. The Company utilizes this method due to lack of historical exercise data and the plain nature of its stock-based awards. Prior to the Company’s IPO, the expected term of stock options granted to non-employees also used the “simplified” method. Following the Company’s IPO, the expected term of options granted to non-employees is determined by contractual term. The risk-free interest rate is determined by reference to the U.S. Treasury yield curve in effect at the time of grant of the award for time periods approximately equal to the expected term of the award. The Company has not paid, and does not anticipate paying, cash dividends on its common stock; therefore, the expected dividend yield is assumed to be zero.

The Company classifies stock-based compensation expense in its consolidated statements of operations and comprehensive loss in the same manner in which the award recipient’s cash compensation costs are classified.

Income Taxes

The Company accounts for income taxes using the asset and liability method, which requires the recognition of deferred tax assets and liabilities for the expected future tax consequences of events that have been recognized in the financial statements or the Company’s tax returns. Under this method, deferred tax assets and liabilities are determined based on the differences between the consolidated financial statements and tax basis of assets and liabilities using enacted tax rates in effect for the year in which the differences are expected to reverse. Changes in deferred tax assets and liabilities are recorded in the provision for income taxes. The Company assesses the likelihood that its deferred tax assets will be recovered from future taxable income and, to the extent it believes, based upon the weight of available evidence, that it is more likely than not that all or a portion of the deferred tax assets will not be realized, a valuation allowance is established.

The Company accounts for uncertain tax positions recognized in the consolidated financial statements by prescribing a more-likely-than-not threshold for financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The provision for income taxes includes the effects of any resulting tax reserves, or unrecognized tax benefits, that are considered appropriate as well as the related net interest and penalties.

Net Income (Loss) per Share

Basic net income (loss) per share is computed by dividing net loss by the weighted-average number of common shares outstanding during the period. Diluted net loss per share is computed using the weighted-average number of common shares outstanding during the period and, if dilutive, the weighted-average number of potential shares of common stock. Net income (loss) per share attributable to common stockholders is calculated using the two-class method, which is an earnings allocation formula that determines net loss per share for the holders of the Company’s common shares and participating securities. Net income (loss) attributable to common stockholders and participating preferred shares are allocated to each share on an as-converted basis as if all of the earnings for the period had been distributed. The participating securities do not include a contractual obligation to share in losses of the Company and are not included in the calculation of net loss per share in the periods in which a net loss is recorded.

Diluted net income (loss) per share is computed using the more dilutive of (a) the two-class method or (b) the if-converted method. The Company allocates earnings first to preferred stockholders based on dividend rights and then to common and preferred stockholders based on ownership interests. The weighted-average number of common shares included in the computation of diluted net income (loss) effect to all potentially dilutive common equivalent shares, including outstanding stock options and Preferred Stock. Common stock equivalent shares are excluded from the computation of diluted net loss per share if their effect is antidilutive. In periods in which the Company reports a net income (loss) attributable to common stockholders, diluted net income (loss) per share attributable to common stockholders is generally the same as basic net income (loss) per share attributable to common stockholders since dilutive common shares are not assumed to have been issued if their effect is anti-dilutive.

Recently Issued Accounting Pronouncements

In March 2020, the FASB issued “ASU 2020-03”, Codification Improvements to Financial Instruments, (“ASU 2020-03”) which addressed, among other topics, Amendments related to ASU 2016-13 Financial Instruments—Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments ("ASU 2016-13”). The amendments align the contractual term under Topic 326 and Topic 842 (Leases) to be consistent, and also clarifies when an entity should record an allowance for credit losses in accordance with Topic 326. For public business entities that meet the definition of a SEC filer, excluding entities eligible to be smaller reporting companies as defined by the SEC, the standard is effective for fiscal years beginning after December 15, 2019, including interim periods within those fiscal years. For all other entities, the standard is effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. Early adoption is permitted. The Company is currently evaluating the impact of this new guidance on the Company’s consolidated financial statements and related disclosures but does not expect the adoption of ASU 2020-03 or ASU 2016-13 to be material.

Fair Value of Financial Assets and Liabilities

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities

3. Fair Value of Financial Assets and Liabilities

The following table presents information about the Company’s financial assets and liabilities 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):

	December 31, 2022
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Other Observable Inputs
Description	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds, included in cash and cash equivalents	$	53,511	$	53,511	$	—	$	—
Total financial assets	$	53,511	$	53,511	$	—	$	—

	December 31, 2021
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Other Observable Inputs
Description	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds, included in cash and cash equivalents	$	24,798	$	24,798	$	—	$	—
Marketable securities:
Commercial Paper		26,131		—		26,131		—
Corporate debt securities		15,838		—		15,838		—
Total financial assets	$	66,767	$	24,798	$	41,969	$	—

As of December 31, 2022 and 2021, the Company’s cash equivalents consisted of money market funds, classified as Level 1 financial assets, as these assets are valued using quoted market prices in active markets without any valuation adjustment. The financial assets valued based on Level 2 inputs as of December 31, 2021 consist of corporate debt securities and commercial paper, which consist of investments in highly-rated investment-grade securities. The Company estimates the fair values of these marketable securities by taking into consideration valuations obtained from third-party pricing sources. These pricing sources utilize industry standard valuation models, including both income and market-based approaches, for

which all significant inputs are observable, either directly or indirectly, to estimate fair value. These inputs include market pricing based on real-time trade data for the same or similar securities, issuer credit spreads, benchmark yields, and other observable inputs. The Company validates the prices provided by its third-party pricing sources by understanding the models used, obtaining market values from other pricing sources and analyzing pricing data in certain instances.

During the years ended December 31, 2022 and 2021, there were no transfers between fair value measurement levels.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Investments

12 Months Ended

Dec. 31, 2022

Investments Debt And Equity Securities [Abstract]

Investments

4. Investments

As of December 31, 2022, the Company held no investments. As of December 31, 2021, the Company had short-term investments consisting of corporate debt securities and commercial paper, which are considered to be available-for-sale investments. These are included in short-term investments on the consolidated balance sheets, even though the stated maturity date may be one year or more beyond the current balance sheet date, as the Company views those securities as available for use in current operations, if needed. The following table summarizes the Company’s investments as of December 31, 2021 (in thousands):

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss			Fair Value
Current:
Commercial paper	$	26,131	$	—	$	—		$	26,131
Corporate debt securities		15,854		—		(16	)		15,838
Total	$	41,985	$	—	$	(16	)	$	41,969

As of December 31, 2021, the Company held seven available-for-sale securities with an aggregate value of approximately $15.8 million in an unrealized loss position for less than twelve months. The Company held these securities until their final maturity date and determined there was no other-than-temporary impairment as of December 31, 2022 and 2021.

Property and Equipment, net

12 Months Ended

Dec. 31, 2022

Property Plant And Equipment [Abstract]

Property and Equipment, net

5. Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	December 31, 2022			December 31, 2021
Property and equipment:
Leasehold improvements	$	376		$	336
Furniture and fixtures	464				143
Property and equipment	$	840		$	479
Less: accumulated depreciation		(840	)		(229	)
Property and equipment, net	$	—		$	250

Depreciation expense was $0.6 million and $0.1 million for the years ended December 31, 2022 and 2021, respectively. In July 2022, the Company entered into a second amendment and termination of office lease agreement (the “Termination Agreement”) to terminate the lease under the May 2019 Lease Agreement, as amended by the June 2021 Amended Lease Agreement. The Company revised the estimated useful lives of the existing leasehold improvements and furniture placed in service at its premises, which are included as component of property and equipment, net on its consolidated balance sheets and are fully depreciated as of December 31, 2022.

Accrued Expenses

12 Months Ended

Dec. 31, 2022

Payables And Accruals [Abstract]

Accrued Expenses

6. Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	December 31, 2022		December 31, 2021
Accrued research and development expenses	$	85	$	2,288
Accrued compensation and benefits		127		2,024
Accrued professional services		1,100		249
Accrued other	369			43
Total accrued expenses	$	1,681	$	4,604

License and Purchase Agreements

12 Months Ended

Dec. 31, 2022

License And Purchase Agreements [Abstract]

License and Purchase Agreements

7. License and Purchase Agreements

Tovinontrine (IMR-687) – Exclusive License Agreement with Lundbeck

In April 2016, the Company entered into a license agreement with Lundbeck (the “Lundbeck Agreement”) pursuant to which Lundbeck, among other things, granted the Company an exclusive, royalty-bearing license to certain patent rights and certain know-how owned or otherwise controlled by Lundbeck to research, develop, make, use, sell, and commercialize products from PDE9 inhibitors, which included tovinontrine. In November 2022, the Lundbeck Agreement was assigned to Cardurion in connection with the Asset Sale.

Prior to the assignment to Cardurion, the Company made cash payments to Lundbeck of $2.0 million consisting of an upfront payment and ongoing milestone payments of which $0.3 million was paid during the year ended December 31, 2022. Such payments were recorded as research and development expense. No payments were made during the year ended December 31, 2021. As partial consideration for the license, the Company issued 167,523 shares of common stock to Lundbeck in 2016, which represented 8.0% of the Company’s then outstanding equity pursuant to a restricted stock agreement. The shares were fully vested on the date of issuance.

Sale of Tovinontrine (IMR-687) and the PDE9 program

In November 2022, the Company completed the Asset Sale to Cardurion pursuant to the Asset Purchase Agreement entered into in September 2022. In advance of executing the Asset Purchase Agreement, Cardurion paid the Company $0.3 million upon the execution of a non-binding term sheet as a reimbursement to the Company for fees it paid to Lundbeck related to its license agreement with Lundbeck. In accordance with the Asset Purchase Agreement the Company sold the license, know-how, patent rights, clinical research organization and clinical manufacturing organization contracts, inventory for its research and development, and other intangible assets related to tovinontrine and its PDE9 program to Cardurion in exchange for an up-front cash payment of $34.8 million. In addition, the Asset Purchase Agreement includes future milestone payments if Cardurion achieves a proof-of-concept milestone and if Cardurion achieves a regulatory and/or commercial milestone. Specifically, if Cardurion achieves the proof-of-concept milestone it will pay the Company a $10.0 million milestone payment, and if Cardurion achieves the regulatory and/or commercial milestone it will pay the Company a $50.0 million milestone payment. These milestone payments are a form of contingent consideration as the Company’s receipt of these payments is contingent upon the achievement of the future milestones. The Company has excluded these payments from the transaction price at closing, and will recognize a gain contingency when the milestones are achieved.

As a result of the Asset Sale, the Company recognized a gain on the Asset Sale equal to $35.0 million, which is included in the Consolidated Statements of Operations and Comprehensive Income (Loss) for the year ended December 31, 2022. Additionally, as part of the asset sale process, the Company incurred costs of $2.5 million for legal, accounting and transaction services. $2.0 million of these costs were incurred during the third quarter 2022, and the remaining $0.5 million were incurred in the fourth quarter 2022. The Company recognized these costs within the General and administrative line of the Condensed Consolidated Statements of Operations and Comprehensive loss for the periods ended September 30, 2022, and the Consolidated Statements of Operations and Comprehensive Income (Loss) for the year ended December 31, 2022.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2022

Commitments And Contingencies Disclosure [Abstract]

Commitments and Contingencies

8. Commitments and Contingencies

Lease Agreements

In May 2019, the Company entered into a new operating lease agreement for office space totaling 4,210 square feet, located in Boston, Massachusetts with a 62-month term (the “May 2019 Lease Agreement). The lease included a rent escalation clause which resulted in cash rental payments of approximately $0.3 million annually. Rent expense was recognized on a straight-line basis over the expected lease term. In addition to the base rent, the Company was also responsible for its share of operating expenses, electricity and real estate taxes, in accordance with the terms of the May 2019 Lease Agreement. The Company provided a security deposit of approximately $0.1 million during the year ended December 31, 2019, which was included as a component of other assets on the Company’s consolidated balance sheets for the year ended December 31, 2021.

In June 2021, the Company entered into an amendment to the May 2019 Lease Agreement (the “June 2021 Amended Lease Agreement”). Under the terms of the June 2021 Amended Lease Agreement, the Company expanded its leased premises by an additional 5,026 square feet, bringing the total office space to 9,236 square feet. The term of the June 2021 Amended Lease Agreement commenced in February 2022 and, prior to the early termination of the lease discussed below, was set to expire on March 31, 2027. Upon commencement of the term of the June 2021 Amended Lease Agreement, the annual base rent obligation was approximately $0.6 million, with a total cash obligation for base rent over the initial five-year term of the lease of approximately $3.1 million. In addition to the base rent, the Company was also responsible for its share of operating expenses, electricity and real estate taxes. Upon execution of the June 2021 Amended Lease Agreement, the Company provided an additional security deposit in the amount of $0.1 million, with security deposits under the May 2019 Lease Agreement and June 2021 Amended Lease Agreement totaling $0.2 million.

In July 2022, the Company entered into a second amendment and termination of office lease agreement (the “Termination Agreement”) to terminate the lease under the May 2019 Lease Agreement, as amended by the June 2021 Amended Lease Agreement. The termination of the lease became effective on August 7, 2022 as a result of the landlord entering into a new lease agreement with a third-party tenant for the premises covered by the lease. As part of the Termination Agreement the Company paid a lease termination fee of $0.3 million, which was comprised of forfeiture of its $0.2 million security deposit and an additional fee of $0.1 million. In connection with this termination the Company remeasured its right of use assets and operating lease liabilities and recorded a gain of less than $0.1 million. The Company revised the estimated useful lives of the existing leasehold improvements and furniture placed in service at its premises, which are included as component of property and equipment, net on its consolidated balance sheets and are fully depreciated as of December 31, 2022.

The Company recorded rent expense of approximately $0.5 million and $0.3 million during the years ended December 31, 2022 and 2021, respectively.

There are no future lease payments due under the June 2021 Amended Lease Agreement following termination.

Legal Proceedings

The Company may from time to time be party to litigation arising in the ordinary course of business. The Company was not subject to any material legal proceedings during the years ended December 31, 2022 and 2021, and no material legal proceedings are currently pending or, to the best of its knowledge, threatened.

Indemnification Agreements

The Company enters into standard indemnification agreements in the ordinary course of business. Pursuant to the indemnification agreements, the Company agrees to indemnify, hold harmless, and to reimburse the indemnified party for losses suffered or incurred by the indemnified party, generally the Company’s business partners, in connection with any U.S. patent or any copyright or other intellectual property infringement claim by any third-party with respect to the Company’s products. The term of these indemnification agreements is generally perpetual any time after execution of the agreement. The maximum potential amount of future payments the Company could be required to make under these indemnification agreements is unlimited. The Company has never incurred costs to defend lawsuits or settle claims related to these indemnification agreements.

Stockholders' Equity (Deficit)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Stockholders' Equity (Deficit)

9. Stockholders’ Equity (Deficit)

On August 13, 2019, the Company’s board of directors, and on February 26, 2020, the Company’s stockholders, approved the Company’s restated certificate of incorporation, which became effective upon closing of the IPO on March 16, 2020, to authorize 10,000,000 shares of undesignated preferred stock, $0.001 per share par value, and to increase the number of authorized shares of common stock from 100,000,000 to 200,000,000 shares, $0.001 per share par value.

Common stockholders are entitled to receive dividends, as may be declared by the Board, if any, subject to the preferential dividend rights of any preferred stock then outstanding. Through December 31, 2022, no cash dividends have been declared or paid.

As of December 31, 2022, 10,000,000 shares of preferred stock were authorized and no shares of preferred stock were issued or outstanding.

As of December 31, 2022 and December 31, 2021, the Company has reserved for future issuance the following shares of common stock:

	December 31, 2022		December 31, 2021
Shares reserved for future issuance under the 2020 Equity Incentive Plan		2,627,945		1,216,532
Shares reserved for future issuance under the 2020 Employee Stock Purchase Plan		438,539		175,667
		3,066,484		1,392,199

Stock-Based Compensation

12 Months Ended

Dec. 31, 2022

Stock-Based Compensation

10. Stock-Based Compensation

2016 Stock Incentive Plan

The Company’s 2016 Stock Incentive Plan, (the “2016 Plan”) provided for the grant of restricted stock, restricted stock units, stock appreciation rights, incentive stock options, non-statutory stock options and other stock-based awards to employees, officers, members of the Board, consultants and advisors of the Company.

As of the effective date of the 2020 Equity Incentive Plan, no shares remained available for future issuance under the 2016 Plan. Any options or awards outstanding under the 2016 Plan remained outstanding and effective.

2020 Equity Incentive Plan

On October 1, 2019, the Company’s board of directors adopted, and on February 26, 2020 the Company’s stockholders approved, the 2020 Equity Incentive Plan (the “2020 Plan”), which became effective on March 11, 2020. The 2020 Plan provides for the grant of incentive stock options, non-qualified stock options, stock appreciation rights, restricted stock awards, restricted stock units and other stock-based awards. The number of shares reserved for issuance under the 2020 Plan is the sum of: (1) 1,220,283 shares of the Company’s common stock; plus (2) the number of shares (up to a maximum of 2,091,969 shares) equal to the sum of (x) 228,852 shares, which represents the Company’s common stock reserved for issuance under the 2016 Plan that remained available for grant under the 2016 Plan as of March 11, 2020 and (y) the number of shares of the Company’s common stock subject to outstanding awards granted under the 2016 Plan that expire, terminate or are otherwise surrendered, cancelled, forfeited or repurchased by the Company at their original issuance price pursuant to a contractual repurchase right. The number of shares reserved shall be annually increased on the first day of each fiscal year, beginning with the fiscal year ending December 31, 2021 and continuing until, and including, the fiscal year ending December 31, 2030, equal to the lesser of (i) 4% of the number of shares of the Company’s common stock outstanding on the first day of such fiscal year and (ii) an amount determined by the Company’s board of directors. On January 1, 2021, 701,930 additional shares were reserved for issuance under the 2020 Plan pursuant to this provision. On January 1, 2022, a further 1,051,490 shares were reserved for future under the 2020 Plan pursuant to this provision. No more than 8,541,982 shares of common stock may be issued as incentive stock options under the 2020 Plan. The shares of common stock underlying any awards that expire, terminate, or are otherwise surrendered, cancelled, forfeited or repurchased by the Company under the 2016 Plan or the 2020 Plan will be added back to the shares of common stock available for issuance under the 2020 Plan.

As of December 31, 2022, there were 2,627,945 shares available for future issuance under the 2020 Plan.

The following table summarizes the Company’s stock option activity:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021		2,373,024		$	9.63		8.19	$	—
Granted		501,839			1.35
Exercised		-
Forfeited		(1,075,205	)		10.00
Outstanding as of December 31, 2022		1,799,658		$	7.10	7.17		$	1,006
Options vested and exercisable as of December 31, 2022		1,291,257		$	7.03	6.79		$	428

The aggregate intrinsic value of options is calculated as the difference between the exercise price of the stock options and the fair value of the Company’s common stock for those stock options that had exercise prices lower than the fair value of the common stock as of the end of the period.

The weighted-average grant date fair value of the Company’s stock options granted during the years ended December 31, 2022 and 2021 was $1.02 and $7.00, respectively.

The assumptions that the Company used to determine the grant date fair value of stock options granted to employees, non-employees and members of the Board during the years ended December 31, 2022 and 2021 were as follows, presented on a weighted-average basis:

	Year Ended December 31,
	2022			2021
Expected term (in years)		6.16			6.20
Expected volatility		91.18	%		81.0	%
Expected dividend yield		0.00	%		0.00	%
Risk-free interest rate		1.83	%		0.81	%

Restricted Stock Units

In January 2022, the Company granted 425,289 restricted stock units to employees under the 2020 Plan, which will vest over a four year term. A summary of the restricted stock unit ("RSU") activity and related information is as follows:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2021		—	$	—
Granted		425,289		1.38
Vested		—		—
Forfeited		(211,846)		1.38
Unvested as of December 31, 2022		213,443	$	1.38

Performance-based awards

The Company granted stock options to purchase an aggregate of 220,928 shares of common stock to certain employees, officers and consultants and advisors of the Company on May 16, 2019, June 5, 2019 and June 21, 2019, which contain performance-based vesting criteria. Vesting of these options was contingent on the closing of the second tranche of Series B Preferred Stock financing. Stock-based compensation expense associated with performance-based stock options is recognized if the performance conditions are considered probable of being achieved, using management’s best estimates. As a result of the performance condition being met on February 25, 2020, these options vested as to 25% of the shares underlying each option on February 25, 2021 and vest as to the remainder of the shares in equal quarterly installments for

three years thereafter. The Company recognized stock-based compensation expense of less than $0.1 million and $0.2 million for these options during the years ended December 31, 2022 and December 31, 2021, respectively.

Stock-Based Compensation

Stock-based compensation expense included in the Company’s consolidated statements of operations and comprehensive loss is as follows (in thousands):

	Year Ended December 31,
	2022		2021
General and administrative	$	2,398	$	2,441
Research and development		197		1,404
Total stock-based compensation expense	$	2,595	$	3,845

As of December 31, 2022, total unrecognized compensation cost related to the unvested stock-based awards was $2.3 million, to be recognized over a weighted-average period of 1.89 years.

2020 Employee Stock Purchase Plan

On October 1, 2019, the Company’s board of directors adopted, and on February 26, 2020, the Company’s stockholders approved the 2020 Employee Stock Purchase Plan (the “2020 ESPP”), which became effective on March 11, 2020. The 2020 ESPP permits eligible employees who elect to participate, in six-month offering periods, to purchase shares of common stock through payroll deductions at a price equal to 85% of the fair market value of the common stock on the first or last business day of each applicable six-month offering period, whichever is lower. Purchase dates under the ESPP occur on or about June 14 and December 14 each year.

The 2020 ESPP initially provides participating employees with the opportunity to purchase up to an aggregate of 193,216 shares of the Company’s common stock. The number of shares of the Company’s common stock reserved for issuance under the 2020 ESPP will automatically increase on the first day of each fiscal year, beginning with the fiscal year commencing on January 1, 2021 and continuing until, and including, the fiscal year commencing on January 1, 2031, in an amount equal to the lowest of (i) 386,432 shares of the Company’s common stock, (ii) 1% of the number of shares of the Company’s common stock outstanding on the first day of such fiscal year and (iii) an amount determined by the Company’s board of directors. The Company’s board of directors decided not to increase the number of shares of the Company’s common stock reserved for issuance under the 2020 ESPP for the 2021 fiscal year. On January 1, 2022, 262,872 additional shares were reserved for issuance under the 2020 ESPP pursuant to this provision.

The Company did not withhold any amount from employees during the year ended December 31, 2022 and did not issue any shares. During the year ended December 31, 2021, less than $0.1 million was withheld from employees, on an after-tax basis, in order to purchase 15,696 shares of the Company’s common stock. The Company recorded no stock-based compensation expense related to the 2020 ESPP for the year ended December 31, 2022 and less than $0.1 million for the year ended December 31, 2021. As of December 31, 2022, 438,539 shares of the Company’s common stock remained available for issuance under the 2020 ESPP.

Income Taxes

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Income Taxes

11. Income Taxes

For the year ended December 31, 2022, the Company recorded pre-tax book income of approximately $1.6 million, due substantially to the Asset Sale discussed in Note 7 above. As a result, the Company recorded tax expense of approximately $88.0 thousand in 2022, as the Company’s taxable income for the year is not able to be fully offset with current and prior year tax attributes. In 2021, the Company did not record a current or deferred income tax expense or benefit due to current and historical losses incurred by the Company. The Company’s income and losses before income taxes consist solely of income and losses from domestic operations.

On March 27, 2020, the United States enacted the Coronavirus Aid, Relief, and Economic Security Act (“CARES Act”). The Cares Act includes provisions relating to refundable payroll tax credits, deferment of the employer portion of certain payroll taxes, net operating loss carryback periods, alternative minimum tax credit refunds, modifications to the net interest deduction limitations and technical corrections to tax depreciation methods for qualified improvement property. The

CARES Act also established a Paycheck Protection Program whereby certain small businesses are eligible for a loan to fund payroll expenses, rent, and related costs.

The CARES Act provided for an Employee Retention Credit (“ERC”), which is a refundable payroll tax credit that encouraged businesses to keep employees on the payroll during the COVID-19 pandemic. Eligible employers are entitled to a refundable tax credit equal to 50% of qualified wages paid to employees between March 13, 2020, and December 31, 2020, up to a maximum of $5,000 credit per employee. In late December 2020 Congress expanded and amended the CARES Act by enacting Public Law 116-260. Per the amendment to the CARES Act, eligible employers are entitled to a refundable tax credit equal to 70% of the qualified wages paid to employees between January 1, 2021, and June 30, 2021, up to a maximum of$10,000 of wages per employee per quarter, with a maximum of $7,000 per employee per calendar quarter. Congress further extended the credit with the American Rescue Plan signed into law on March 11, 2021; the American Rescue Plan extended the credit for the period July 1, 2021 to December 31, 2021 with the same limitations as the prior amendment (i.e., tax credit equal to 70% of qualified wages up to a maximum of $10,000 of wages per employee per quarter). However, on November 15, 2021, President Biden signed into law the Infrastructure Investment and Jobs Act which redacted the credit for calendar quarter 4 of 2021. Qualified Wages must be paid on or after March 13, 2020 and before October 1, 2021, and may include wages paid to employees, as well as so much of the employer’s qualified health plan expenses as are properly allocable to such wages, not to exceed $10,000 per employee for calendar year 2020 or $10,000 per employee per calendar quarter in quarter 1, 2, or 3 of 2021 (“2021 Eligible Quarter”). The Retention Credit may be claimed for up to $5,000 per employee for calendar year 2020 (i.e., 50% of the $10,000 maximum in Qualified Wages for calendar year 2020) or $7,000 per employee per 2021 Eligible Quarter (i.e., 70% of the $10,000 maximum in Qualified Wages per 2021 Eligible Quarter). Therefore, the maximum Retention Credit per employee in 2020 is $5,000 and in 2021 is $21,000.

Based on the Company’s evaluation of this provision and pandemic-related impact on its operations in 2020 and 2021, it was determined that the Company qualified to claim ERC in the second, third and fourth calendar quarters of 2020, as well as in both the first, second, and third calendar quarters of 2021. The Company recognized an ERC of approximately $1.0 million as an offset to payroll tax expenses for the year ended December 31, 2021, in its consolidated statements of operations.

A reconciliation of income tax expense (benefit) computed at the statutory federal income tax rate to income taxes as reflected in the consolidated financial statements is as follows:

	2022			2021
Income taxes at U.S. statutory rate		21	%		21	%
State income taxes		15.0			6
Permanent items		-3.2			0
Tax Credit		-142.9			5
Equity Compensation		70.9			0
Other		0.1			0
Change in valuation allowance		44.7			(32	)
Total provision for income taxes		5.6	%		0	%

Deferred taxes are recognized for temporary differences between the basis of assets and liabilities for financial statement and income tax purposes. The significant components of the Company’s deferred tax assets and liabilities as of December 31, 2022 and 2021 are comprised of the following (in thousands):

	Year Ended December 31,
	2022			2021
Deferred tax assets
Net operating loss carryforwards	$	32,931		$	37,411
Tax credits carryforwards		8,930			6,968
Capitalized Sec. 174 Costs		4,591			—
Stock-based compensation		673			1,268
Amortization		323			493
Accruals		—			545
Lease incentive liability		—			—
Lease liability		—			175
Unrealized gains/losses on investments		—			4
Other	5			31
Total deferred tax assets		47,453			46,895
Valuation allowance		(47,453	)		(46,742	)
Net deferred tax assets		—			153
Deferred tax liabilities
Tenant improvement allowance		—			(12	)
Unrealized gains/losses on investments		—			—
Right of Use Asset		—			(141	)
Less Valuation Allowance		—			—
Total deferred tax liabilities		—			(153	)
Net deferred taxes	$	—		$	—

The Company has evaluated the positive and negative evidence bearing upon its ability to realize its deferred tax assets, which are comprised primarily of net operating loss carryforwards and tax credits. Management has considered the Company’s history of cumulative net losses in the United States, estimated future taxable income and prudent and feasible tax planning strategies and has concluded that it is more likely than not that the Company will not realize the benefits of its U.S. federal and state deferred tax assets. Accordingly, a full valuation allowance has been established against these net deferred tax assets as of December 31, 2022 and 2021, respectively. The Company reevaluates the positive and negative evidence at each reporting period. The Company’s valuation allowance increased during 2022 by approximately $0.7 million primarily due to capitalized section 174 costs that were generated in the current year partially offset by utilization of net operating losses because of current year taxable income.

As of December 31, 2022 and 2021, the Company had U.S. federal net operating loss carryforwards of $122.8 million and $139.2 million, respectively, which may be available to offset future income tax liabilities. The 2017 Tax Cuts and Jobs Act (“TCJA”) will generally allow losses incurred after 2017 to be carried over indefinitely but will generally limit the net operating loss deduction to the lesser of the net operating loss carryover or 80% of a corporation’s taxable income (subject to Section 382 of the Internal Revenue Code of 1986, as amended). Also, there will be no carryback for losses incurred after 2017. Losses incurred prior to 2018 will generally be deductible to the extent of the lesser of a corporation’s net operating loss carryover or 100% of a corporation’s taxable income and be available for twenty years from the period the loss was generated. The Company has federal net operating losses generated following 2017 of $115.9 million, which do not expire. The federal net operating losses generated prior to 2018 of $7.9 million will expire at various dates through 2037.With the exception of the current year, the Company has been generating losses since its inception.

As of December 31, 2022 and 2021, the Company also had U.S. state net operating loss carryforwards of $113 million and $129.4 million, respectively, which may be available to offset future income tax liabilities and expire at various dates through 2041.

As of December 31, 2022 and 2021, the Company had federal tax credit carryforwards of approximately $8.3 million and $6.5 million, respectively, available to reduce future tax liabilities which expire at various dates through 2042. As of December 31, 2022 and 2021, the Company had state research and development tax credit carryforwards of approximately $0.8 million and $0.6 million, respectively, available to reduce future tax liabilities which expire at various dates through 2037.

The utilization of our net operating loss carryforwards and research tax credit carryovers are subject to annual limitations under Section 382 and 383 of the Internal Revenue Code of 1986, and similar state tax provisions, due to ownership change limitations that have occurred previously and that could occur in the future. These ownership changes limit the amount of net operating loss carryforwards and other deferred tax assets that can be utilized to offset future taxable income and tax, respectively. In general, an ownership change, as defined by Section 382 and 383, results from transactions increasing ownership of certain stockholders or public groups in the stock of the corporation by more than 50 percent points over a three-year period. The Company has conducted an analysis of an ownership change under section 382. The impact of the Company's Section 382 study, which was conducted this year, has resulted in a reduction of the amount of tax attributes available to the Company to offset taxable income and income tax liabilities.

The Company has not, as of yet, conducted a study of research and development and orphan drug credit carryovers. Such a study, once undertaken by the Company, may result in an adjustment to the Company's research and development and orphan drug credit carryovers; however, until a study is completed and any adjustment is known, no amounts are being presented as an uncertain tax position. A full valuation allowance has been provided against the Company's research and development and orphan drug credits and, if an adjustment is required, this adjustment would be offset by an adjustment to the valuation allowance. Thus, there would be no impact to the balance sheet or statement of operations if an adjustment were required

At December 31, 2022 and December 31, 2021, the Company did not have any significant uncertain tax positions. The Company will recognize interest and penalties related to uncertain tax positions in income tax expense. As of December 31, 2022 and 2021, the Company had no accrued interest or penalties related to uncertain tax positions and no amounts have been recognized in the Company’s statement of operations. The Company does not anticipate a material change to unrecognized tax benefits in the next twelve months.

The Company files tax returns in the United States and Massachusetts. The Company is subject to U.S. federal and state examinations by tax authorities for years 2018 through the present. In addition, all of the Company’s tax years will remain open for examination by the federal and state taxing authorities to the extent that the Company's tax attributes are utilized in future years to offset income or income taxes.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
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+ Details

Net Income (Loss) Per Share

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Net Income (Loss) Per Share

12. Net Income (Loss) Per Share

The following table sets forth the computation of the Company’s basic and diluted net income (loss) per share for the years ended December 31, 2022 and 2021 (in thousands, except share and per share amounts):

	Year Ended December 31,
	2022		2021
Numerator:
Net income (loss) attributable to common stockholders—basic and diluted	$	1,488	$	(51,384	)
Denominator:
Weighted-average common shares outstanding—basic		26,287,264		21,661,450
Weighted-average common shares outstanding—diluted		26,385,567		21,661,450
Net income (loss) per share applicable to common stockholders—basic	$	0.06	$	(2.37	)
Net income (loss) per share applicable to common stockholders—diluted	$	0.06	$	(2.37	)

The Company excluded the following potential common shares from the computation of diluted net income (loss) per share attributable to common stockholders for the years ended December 31, 2022 and 2021 because including them would have had an anti-dilutive effect:

	Year Ended December 31,
	2022		2021
Options to purchase common stock		1,740,158		2,373,024
Unvested restricted shares		124,768		—
Shares reserved for future issuance under the ESPP		—		175,667

Related Party Transactions

12 Months Ended

Dec. 31, 2022

Related Party Transactions

13. Related Party Transactions

Lundbeck

Lundbeckfond Invest A/S is one of the Company’s stockholders and participated in all tranches of the Series A convertible preferred stock (“Series A Preferred Stock”) financing and both tranches of the Series B Preferred Stock financing. Prior to the conversion of the Company’s preferred stock, Lundbeckfond Invest A/S owned 5,470,492 shares of Series A Preferred Stock as of December 31, 2019, and 478,749 shares of Series Seed convertible preferred stock as of December 31, 2019. Lundbeckfond Invest A/S owned 1,326,111 shares of Series B Preferred Stock as of December 31, 2019. All shares of preferred stock converted into shares of common stock upon closing of the IPO. Lundbeckfond Invest A/S also purchased 187,500 shares of common stock in the IPO. This reflects a 5.1% and a 5.0% ownership interest on a fully diluted basis as of December 31, 2022 and 2021, respectively. Mette Kirstine Agger, who was a member of the Company’s board of directors until June 29, 2021, is a Managing Partner at Lundbeckfonden Ventures, which is an affiliate of Lundbeckfond Invest A/S.

Lundbeck, an affiliate of Lundbeckfond Invest A/S, is also one of the Company’s stockholders and participated in the fourth tranche of the Company’s Series A Preferred Stock financing. Prior to the conversion of the Company’s preferred stock, Lundbeck owned 499,069 shares of Series A Preferred Stock as of December 31, 2019, as well as 443,271 shares of common stock issued in conjunction with the Lundbeck Agreement (See Note 7). All shares of preferred stock converted into shares of common stock upon closing of the IPO. This reflects a 1.9% and a 1.8% ownership interest on a fully diluted basis as of December 31, 2022 and 2021, respectively. Lundbeck did not participate in the Series B Preferred Stock financing.

To date, pursuant to the Lundbeck Agreement, the Company has made cash payments to Lundbeck of $2.0 million consisting of an upfront payment and ongoing milestone payments which are recorded as research and development expense.

Benefit Plans

12 Months Ended

Dec. 31, 2022

Compensation And Retirement Disclosure [Abstract]

Benefit Plans

14. Benefit Plans

The Company established a defined contribution savings plan under Section 401(k) of the Internal Revenue Code effective as of January 2019. This plan covers substantially all employees who meet minimum age and service requirements and allows participants to defer a portion of their annual compensation on a pre-tax basis. Matching contributions to the plan may be made at the discretion of the Board. The Company contributed a match of $0.1 million and $0.2 million to the plan during the years ended December 31, 2022 and 2021, respectively.

- Definition

The entire disclosure for retirement benefits.

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+ Details

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Basis of presentation

Principles of Consolidation

Use of Estimates

Segments

Cash and Cash Equivalents

Restricted Cash

Investments

Offering Costs

Concentrations of Credit Risk and Off-Balance Sheet Risk

As of December 31, 2022 and 2021, the Company had no off-balance sheet risk such as foreign exchange contracts, option contracts, or other hedging arrangements.

Comprehensive Income (Loss)

Fair Value Measurements

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

•

Property and Equipment, Net

		Estimated Useful Life
Computer equipment and software		3 years
Furniture and fixtures		5 years
Laboratory equipment		5 years
Leasehold improvements		Shorter of useful life or remaining lease term

Leases

Research and Development Expense

Research and Development Expenses

As of December 31, 2022, the Company had discontinued its research and development efforts while undertaking a comprehensive assessment of its strategic options to maximize stockholder value.

Accrued Research and Development Expenses

Patents Costs

Patent Costs

Stock-Based Compensation

Income Taxes

Net Income (Loss) per Share

Recently Issued Accounting Pronouncements

Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2022

Accounting Policies [Abstract]

Schedule of Estimated Useful Lives of Assets

		Estimated Useful Life
Computer equipment and software		3 years
Furniture and fixtures		5 years
Laboratory equipment		5 years
Leasehold improvements		Shorter of useful life or remaining lease term

Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis

	December 31, 2022
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Other Observable Inputs
Description	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds, included in cash and cash equivalents	$	53,511	$	53,511	$	—	$	—
Total financial assets	$	53,511	$	53,511	$	—	$	—

	December 31, 2021
			Quoted Prices in Active Markets for Identical Assets		Significant Other Observable Inputs		Significant Other Observable Inputs
Description	Total		(Level 1)		(Level 2)		(Level 3)
Assets:
Money market funds, included in cash and cash equivalents	$	24,798	$	24,798	$	—	$	—
Marketable securities:
Commercial Paper		26,131		—		26,131		—
Corporate debt securities		15,838		—		15,838		—
Total financial assets	$	66,767	$	24,798	$	41,969	$	—

Investments (Tables)

12 Months Ended

Dec. 31, 2022

Investments Debt And Equity Securities [Abstract]

Summary of Investments

The following table summarizes the Company’s investments as of December 31, 2021 (in thousands):

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Loss			Fair Value
Current:
Commercial paper	$	26,131	$	—	$	—		$	26,131
Corporate debt securities		15,854		—		(16	)		15,838
Total	$	41,985	$	—	$	(16	)	$	41,969

Property and Equipment, net (Tables)

12 Months Ended

Dec. 31, 2022

Property Plant And Equipment [Abstract]

Summary of Property and Equipment, net

Property and equipment, net consisted of the following (in thousands):

	December 31, 2022			December 31, 2021
Property and equipment:
Leasehold improvements	$	376		$	336
Furniture and fixtures	464				143
Property and equipment	$	840		$	479
Less: accumulated depreciation		(840	)		(229	)
Property and equipment, net	$	—		$	250

Accrued Expenses (Tables)

12 Months Ended

Dec. 31, 2022

Payables And Accruals [Abstract]

Schedule of Accrued Expenses

Accrued expenses consisted of the following (in thousands):

	December 31, 2022		December 31, 2021
Accrued research and development expenses	$	85	$	2,288
Accrued compensation and benefits		127		2,024
Accrued professional services		1,100		249
Accrued other	369			43
Total accrued expenses	$	1,681	$	4,604

Stockholders' Equity (Deficit) (Tables)

12 Months Ended

Dec. 31, 2022

Equity [Abstract]

Schedule of Shares Reserved for Future Issuance

As of December 31, 2022 and December 31, 2021, the Company has reserved for future issuance the following shares of common stock:

	December 31, 2022		December 31, 2021
Shares reserved for future issuance under the 2020 Equity Incentive Plan		2,627,945		1,216,532
Shares reserved for future issuance under the 2020 Employee Stock Purchase Plan		438,539		175,667
		3,066,484		1,392,199

Stock-Based Compensation (Tables)

12 Months Ended

Dec. 31, 2022

Summary of Stock Option Activity

The following table summarizes the Company’s stock option activity:

	Number of Shares			Weighted- Average Exercise Price		Weighted- Average Remaining Contractual Term (in years)		Aggregate Intrinsic Value (in thousands)
Outstanding as of December 31, 2021		2,373,024		$	9.63		8.19	$	—
Granted		501,839			1.35
Exercised		-
Forfeited		(1,075,205	)		10.00
Outstanding as of December 31, 2022		1,799,658		$	7.10	7.17		$	1,006
Options vested and exercisable as of December 31, 2022		1,291,257		$	7.03	6.79		$	428

Summary of Stock-Based Compensation Fair Value Assumptions

	Year Ended December 31,
	2022			2021
Expected term (in years)		6.16			6.20
Expected volatility		91.18	%		81.0	%
Expected dividend yield		0.00	%		0.00	%
Risk-free interest rate		1.83	%		0.81	%

Summary of Restricted Stock Units Activity

A summary of the restricted stock unit ("RSU") activity and related information is as follows:

	Number of Shares		Weighted- Average Grant Date Fair Value
Unvested as of December 31, 2021		—	$	—
Granted		425,289		1.38
Vested		—		—
Forfeited		(211,846)		1.38
Unvested as of December 31, 2022		213,443	$	1.38

Summary of Stock-Based Compensation Expense

Stock-based compensation expense included in the Company’s consolidated statements of operations and comprehensive loss is as follows (in thousands):

	Year Ended December 31,
	2022		2021
General and administrative	$	2,398	$	2,441
Research and development		197		1,404
Total stock-based compensation expense	$	2,595	$	3,845

Income Taxes (Tables)

12 Months Ended

Dec. 31, 2022

Income Tax Disclosure [Abstract]

Schedule of Reconciliation of Income Tax Expense (Benefit)

A reconciliation of income tax expense (benefit) computed at the statutory federal income tax rate to income taxes as reflected in the consolidated financial statements is as follows:

	2022			2021
Income taxes at U.S. statutory rate		21	%		21	%
State income taxes		15.0			6
Permanent items		-3.2			0
Tax Credit		-142.9			5
Equity Compensation		70.9			0
Other		0.1			0
Change in valuation allowance		44.7			(32	)
Total provision for income taxes		5.6	%		0	%

Schedule of Components of Deferred Tax Assets and Liabilities

The significant components of the Company’s deferred tax assets and liabilities as of December 31, 2022 and 2021 are comprised of the following (in thousands):

	Year Ended December 31,
	2022			2021
Deferred tax assets
Net operating loss carryforwards	$	32,931		$	37,411
Tax credits carryforwards		8,930			6,968
Capitalized Sec. 174 Costs		4,591			—
Stock-based compensation		673			1,268
Amortization		323			493
Accruals		—			545
Lease incentive liability		—			—
Lease liability		—			175
Unrealized gains/losses on investments		—			4
Other	5			31
Total deferred tax assets		47,453			46,895
Valuation allowance		(47,453	)		(46,742	)
Net deferred tax assets		—			153
Deferred tax liabilities
Tenant improvement allowance		—			(12	)
Unrealized gains/losses on investments		—			—
Right of Use Asset		—			(141	)
Less Valuation Allowance		—			—
Total deferred tax liabilities		—			(153	)
Net deferred taxes	$	—		$	—

Net Income (Loss) Per Share (Tables)

12 Months Ended

Dec. 31, 2022

Earnings Per Share [Abstract]

Computation of Basic and Diluted Net Income (Loss) Per Share

	Year Ended December 31,
	2022		2021
Numerator:
Net income (loss) attributable to common stockholders—basic and diluted	$	1,488	$	(51,384	)
Denominator:
Weighted-average common shares outstanding—basic		26,287,264		21,661,450
Weighted-average common shares outstanding—diluted		26,385,567		21,661,450
Net income (loss) per share applicable to common stockholders—basic	$	0.06	$	(2.37	)
Net income (loss) per share applicable to common stockholders—diluted	$	0.06	$	(2.37	)

Anti Dilutive Potential Common Shares Excluded From Computation of Diluted Net Income (Loss) Per Share

	Year Ended December 31,
	2022		2021
Options to purchase common stock		1,740,158		2,373,024
Unvested restricted shares		124,768		—
Shares reserved for future issuance under the ESPP		—		175,667

Nature of the Business - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands					12 Months Ended
	Sep. 06, 2022	Apr. 12, 2022	Jul. 16, 2021	Apr. 01, 2021	Dec. 31, 2022	Dec. 31, 2021
Nature Of Business [Line Items]
Workforce reduction, cost		$ 2,100
Cash and cash equivalents					$ 88,198	$ 48,309
Accumulated deficit					$ 146,009	$ 147,497
Common stock issued and sold			8,333,333		0
Common stock, shares issued					26,287,264	26,287,264
Net proceeds from issuance of common stock			$ 46,800
Public offering price per share			$ 6.00
Maximum
Nature Of Business [Line Items]
Common stock issued and sold				200,000,000.0
Aggregate gross proceeds of common stock issued and sold				$ 75,000
At The Market Offering
Nature Of Business [Line Items]
Common stock, shares issued					231,291
Net proceeds from issuance of common stock					$ 1,400
Asset Purchase Agreement \| Cardurion Pharmaceuticals, Inc
Nature Of Business [Line Items]
Upfront payment and future contingent payments	$ 35,000

Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Dec. 31, 2022 USD ($) Segment	Dec. 31, 2021 USD ($)
Summary Of Significant Accounting Policies [Line Items]
Number of operating segments \| Segment	1
Restricted cash		$ 175,000
Off-balance sheet risk	$ 0	0
Depreciation expense	611,000	99,000
Right of use assets - operating leases		525,000
Operating lease liability, current		246,000
Operating lease liability, non-current		406,000
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Right of use assets - operating leases		700,000
Operating lease liability, current		300,000
Operating lease liability, non-current		600,000
Construction-in-process
Summary Of Significant Accounting Policies [Line Items]
Depreciation expense	0
Other Assets
Summary Of Significant Accounting Policies [Line Items]
Deferred offering costs capitalized	$ 2,300,000	0
Maximum
Summary Of Significant Accounting Policies [Line Items]
Restricted cash		$ 200,000

Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	12 Months Ended
	Dec. 31, 2022
Computer Equipment and Software
Property Plant And Equipment [Line Items]
Estimated Useful Life	3 years
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Estimated Useful Life	5 years
Laboratory Equipment
Property Plant And Equipment [Line Items]
Estimated Useful Life	5 years
Leasehold Improvements
Property Plant And Equipment [Line Items]
Estimated Useful Life	Shorter of useful life or remaining lease term

Fair Value of Financial Assets and Liabilities - Schedule of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Assets:
Marketable securities		$ 41,969
Fair Value Measurements Recurring
Assets:
Total financial assets	$ 53,511	66,767
Fair Value Measurements Recurring \| Money Market Funds
Assets:
Cash and cash equivalents	53,511	24,798
Fair Value Measurements Recurring \| Corporate Debt Securities
Assets:
Marketable securities		15,838
Fair Value Measurements Recurring \| Commercial Paper
Assets:
Marketable securities		26,131
Fair Value Measurements Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Assets:
Total financial assets	53,511	24,798
Fair Value Measurements Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money Market Funds
Assets:
Cash and cash equivalents	$ 53,511	24,798
Fair Value Measurements Recurring \| Fair Value, Inputs, Level 2
Assets:
Total financial assets		41,969
Fair Value Measurements Recurring \| Fair Value, Inputs, Level 2 \| Corporate Debt Securities
Assets:
Marketable securities		15,838
Fair Value Measurements Recurring \| Fair Value, Inputs, Level 2 \| Commercial Paper
Assets:
Marketable securities		$ 26,131

Investments - Additional Information (Details)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($) Position
Investments Debt And Equity Securities [Abstract]
Investments	$ 0
Number of available-for-sale securities in unrealized loss positions for less than twelve months \| Position		7
Available-for-sale securities in unrealized loss positions for less than twelve months		$ 15,800,000

Investments - Summary of Investments (Details) $ in Thousands	Dec. 31, 2021 USD ($)
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 41,985
Gross Unrealized Loss	(16)
Fair Value	41,969
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	26,131
Fair Value	26,131
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	15,854
Gross Unrealized Loss	(16)
Fair Value	$ 15,838

Property and Equipment, net - Summary of Property and Equipment, net (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment	$ 840	$ 479
Less: accumulated depreciation	(840)	(229)
Property and equipment, net		250
Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment	376	336
Furniture and Fixtures
Property Plant And Equipment [Line Items]
Property and equipment	$ 464	$ 143

Property and Equipment, net - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Property Plant And Equipment [Abstract]
Depreciation expense	$ 611	$ 99

Accrued Expenses - Schedule of Accrued Expenses (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Payables And Accruals [Abstract]
Accrued research and development expenses	$ 85	$ 2,288
Accrued compensation and benefits	127	2,024
Accrued professional services	1,100	249
Accrued other	369	43
Total accrued expenses	$ 1,681	$ 4,604

License and Purchase Agreements - Additional Information (Details) - USD ($)	1 Months Ended	3 Months Ended		12 Months Ended		81 Months Ended
	Nov. 30, 2022	Dec. 31, 2022	Sep. 30, 2022	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2019	Apr. 30, 2016
License And Purchase Agreements [Line Items]
Common stock, shares issued		26,287,264		26,287,264	26,287,264	26,287,264
Gain on asset sale				$ 35,000,000
Lundbeck \| Lundbeck Agreement
License And Purchase Agreements [Line Items]
Upfront and ongoing milestone payments					$ 0
Common stock, shares issued							443,271	167,523
Outstanding equity percentage pursuant to restricted stock agreement								8.00%
Lundbeck \| Lundbeck Agreement \| Research and Development Expense
License And Purchase Agreements [Line Items]
Upfront and ongoing milestone payments				300,000		$ 2,000,000.0
Cardurion Pharmaceuticals Inc. \| Sale of Tovinontrine (IMR-687) and PDE9 Program
License And Purchase Agreements [Line Items]
Payment of asset purchase agreement	$ 300,000
Upfront cash payment	34,800,000
Asset purchase agreement milestone payments	10,000,000.0
Asset purchase agreement regulatory and/or commercial milestone payments.	$ 50,000,000.0
Gain on asset sale				35,000,000.0
Legal, accounting and transaction services cost		$ 500,000	$ 2,000,000.0	$ 2,500,000

Commitments and Contingencies - Additional Information (Details) - USD ($)	1 Months Ended			12 Months Ended
	Jul. 31, 2022	Jun. 30, 2021	May 31, 2019	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2019
Commitments and Contingencies [Line Items]
Operating lease description				In June 2021, the Company entered into an amendment to the May 2019 Lease Agreement (the “June 2021 Amended Lease Agreement”). Under the terms of the June 2021 Amended Lease Agreement, the Company expanded its leased premises by an additional 5,026 square feet, bringing the total office space to 9,236 square feet.
Rent expense				$ 500,000	$ 300,000
Termination Agreement
Commitments and Contingencies [Line Items]
Lease termination fee	$ 300,000
Forfeiture of security deposit	200,000
Additional lease termination fee	100,000
Termination Agreement \| Maximum
Commitments and Contingencies [Line Items]
Gain on remeasurement of right of use assets and operating lease liabilities	$ 100,000
May 2019 Lease Agreement
Commitments and Contingencies [Line Items]
Operating lease description				In May 2019, the Company entered into a new operating lease agreement for office space totaling 4,210 square feet, located in Boston, Massachusetts with a 62-month term (the “May 2019 Lease Agreement).
Operating lease term of contract			62 months
Operating lease, payments			$ 300,000
Security deposit						$ 100,000
Additional security deposit		$ 100,000
June 2021 Amended Lease Agreement
Commitments and Contingencies [Line Items]
Security deposit		200,000
Operating lease, payments		3,100,000		$ 0
Rent expense		$ 600,000

Stockholders' Equity (Deficit) - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Mar. 16, 2020	Dec. 31, 2019
Equity [Abstract]
Preferred stock, shares authorized	10,000,000	10,000,000	10,000,000
Preferred stock, par value	$ 0.001	$ 0.001	$ 0.001
Common stock, shares authorized	200,000,000	200,000,000	200,000,000	100,000,000
Common stock, par value	$ 0.001	$ 0.001	$ 0.001
Cash dividends	$ 0
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0

Stockholders' Equity (Deficit) - Schedule of Shares Reserved for Future Issuance (Details) - shares	Dec. 31, 2022	Jan. 01, 2022	Dec. 31, 2021	Jan. 01, 2021
Class Of Stock [Line Items]
Shares reserved for future issuance	3,066,484		1,392,199
2020 Equity Incentive Plan
Class Of Stock [Line Items]
Shares reserved for future issuance	2,627,945	1,051,490	1,216,532	701,930
2020 Employee Stock Purchase Plan
Class Of Stock [Line Items]
Shares reserved for future issuance	438,539	262,872	175,667

Stock-Based Compensation - Additional Information (Details) - USD ($)							1 Months Ended	12 Months Ended
	Jul. 16, 2021	Apr. 01, 2021	Mar. 11, 2020	Jun. 21, 2019	Jun. 05, 2019	May 16, 2019	Jan. 31, 2022	Dec. 31, 2022	Dec. 31, 2021	Jan. 01, 2022	Jan. 01, 2021	Dec. 31, 2019
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future issuance								3,066,484	1,392,199
Share-based compensation award, weighted-average fair value								$ 1.02	$ 7.00
Share-based compensation award, granted								501,839
Stock-based compensation expense								$ 2,595,000	$ 3,845,000
Unrecognized stock-based compensation expense								$ 2,300,000
Expected weighted average period to recognize expense								1 year 10 months 20 days
Common stock issued and sold	8,333,333							0
Restricted Stock Units (RSUs)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares, granted							425,289	425,289
Vesting term							4 years
Performance Based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based compensation award, granted				220,928	220,928	220,928
Stock-based compensation expense									$ 200,000
Performance Based Awards \| Tranche One
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock option vest percentage								25.00%
Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Common stock issued and sold		200,000,000.0
Maximum \| Performance Based Awards
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense								$ 100,000
2016 Stock Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future issuance			228,852									0
2020 Equity Incentive Plan
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future issuance								2,627,945	1,216,532	1,051,490	701,930
Number of shares of common stock that may be issued accordance with plan			1,220,283
Description of changes in the number of shares reserved for issuance								The number of shares reserved shall be annually increased on the first day of each fiscal year, beginning with the fiscal year ending December 31, 2021 and continuing until, and including, the fiscal year ending December 31, 2030, equal to the lesser of (i) 4% of the number of shares of the Company’s common stock outstanding on the first day of such fiscal year and (ii) an amount determined by the Company’s board of directors.
Common stock outstanding percent			4.00%
2020 Equity Incentive Plan \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of shares authorized			2,091,969
Number of shares of common stock that may be issued accordance with plan			8,541,982
2020 ESPP
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares remaining available for future issuance								438,539	175,667	262,872
Number of shares authorized			193,216
Number of shares of common stock that may be issued accordance with plan			386,432
Common stock outstanding percent			1.00%
Stock-based compensation expense								$ 0
Offering price percentage			85.00%
Shares purchased under the ESPP									15,696
Withhold any amount									$ 0
Common stock issued and sold									0
2020 ESPP \| Maximum
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense									$ 100,000
Earnings withheld from employees to purchase shares of common stock under purchase plan									$ 100,000

Stock-Based Compensation - Summary of Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Compensation Related Costs [Abstract]
Number of Shares, Beginning Balance	2,373,024
Number of Shares, Granted	501,839
Number of Shares, Forfeited	(1,075,205)
Number of Shares, Ending Balance	1,799,658	2,373,024
Number of Shares, Options vested and exercisable	1,291,257
Weighted-Average Exercise Price, Beginning Balance	$ 9.63
Weighted-Average Exercise Price, Granted	1.35
Weighted-Average Exercise Price, Forfeited	10.00
Weighted-Average Exercise Price, Ending Balance	7.10	$ 9.63
Weighted-Average Exercise Price, Options vested and exercisable	$ 7.03
Weighted-Average Remaining Contractual Term, Outstanding	7 years 2 months 1 day	8 years 2 months 8 days
Weighted-Average Remaining Contractual Term, Options vested and exercisable	6 years 9 months 14 days
Aggregate Intrinsic Value, Balance	$ 1,006
Aggregate Intrinsic Value, Options vested and exercisable	$ 428

Stock-Based Compensation - Summary of Stock-Based Compensation Fair Value Assumptions (Details) - Stock Options	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected term (in years)	6 years 1 month 28 days	6 years 2 months 12 days
Expected volatility	91.18%	81.00%
Expected dividend yield	0.00%	0.00%
Risk-free interest rate	1.83%	0.81%

Stock-Based Compensation - Summary of Restricted Stock Units Activity (Details) - Restricted Stock Units (RSUs) - $ / shares	1 Months Ended	12 Months Ended
	Jan. 31, 2022	Dec. 31, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of Shares, Granted	425,289	425,289
Number of Shares, Forfeited		(211,846)
Number of Shares, Unvested, Ending Balance		213,443
Weighted-Average Grant Date Fair Value, Granted		$ 1.38
Weighted-Average Grant Date Fair Value, Forfeited		1.38
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance		$ 1.38

Stock-Based Compensation - Summary of Stock-Based Compensation Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,595	$ 3,845
Research and Development Expense
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	197	1,404
General and Administrative
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Stock-based compensation expense	$ 2,398	$ 2,441

Income Taxes - Additional Information (Details)	3 Months Ended			6 Months Ended	10 Months Ended	12 Months Ended
Income Taxes - Additional Information (Details)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Jun. 30, 2021	Dec. 31, 2020 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2017 USD ($)
Income Taxes [Line Items]
Pre tax income asset sale						$ 1,600,000
Tax expense						$ 88,000.0
Maximum refundable tax credit allowed per employee					$ 5,000
Percentage of qualified wages	70	70	70	70	50			50
Maximum qualified wages entitled per employee	$ 10,000	$ 10,000	$ 10,000					$ 10,000
Maximum employee retention credit available per employee	$ 7,000	$ 7,000	$ 7,000				$ 21,000	$ 5,000
Qualified wages, description						In late December 2020 Congress expanded and amended the CARES Act by enacting Public Law 116-260. Per the amendment to the CARES Act, eligible employers are entitled to a refundable tax credit equal to 70% of the qualified wages paid to employees between January 1, 2021, and June 30, 2021, up to a maximum of$10,000 of wages per employee per quarter, with a maximum of $7,000 per employee per calendar quarter. Congress further extended the credit with the American Rescue Plan signed into law on March 11, 2021; the American Rescue Plan extended the credit for the period July 1, 2021 to December 31, 2021 with the same limitations as the prior amendment (i.e., tax credit equal to 70% of qualified wages up to a maximum of $10,000 of wages per employee per quarter). However, on November 15, 2021, President Biden signed into law the Infrastructure Investment and Jobs Act which redacted the credit for calendar quarter 4 of 2021. Qualified Wages must be paid on or after March 13, 2020 and before October 1, 2021, and may include wages paid to employees, as well as so much of the employer’s qualified health plan expenses as are properly allocable to such wages, not to exceed $10,000 per employee for calendar year 2020 or $10,000 per employee per calendar quarter in quarter 1, 2, or 3 of 2021 (“2021 Eligible Quarter”).
Employee retention credit as offset to payroll tax expense							1,000,000.0
Valuation allowance increased						$ 700,000
Uncertain tax position						0	0
Unrecognized tax benefits, income tax penalties and interest accrued						0	0
Federal
Income Taxes [Line Items]
Net operating loss carryforwards						$ 122,800,000	139,200,000
Net operating loss carryforwards, limitations on use						The 2017 Tax Cuts and Jobs Act (“TCJA”) will generally allow losses incurred after 2017 to be carried over indefinitely but will generally limit the net operating loss deduction to the lesser of the net operating loss carryover or 80% of a corporation’s taxable income (subject to Section 382 of the Internal Revenue Code of 1986, as amended). Also, there will be no carryback for losses incurred after 2017. Losses incurred prior to 2018 will generally be deductible to the extent of the lesser of a corporation’s net operating loss carryover or 100% of a corporation’s taxable income and be available for twenty years from the period the loss was generated.
Net operating loss carryforwards expiration period						20 years
Net operating loss carryforwards not subject to expiration						$ 115,900,000
Net operating loss carryforwards subject to expiration									$ 7,900,000
Net operating loss carryforwards expiration year									2037
Tax credit carryforwards						$ 8,300,000	6,500,000
Tax credit carryforwards expiration year						2042
State
Income Taxes [Line Items]
Net operating loss carryforwards						$ 113,000,000	129,400,000
Net operating loss carryforwards expiration year						2041
State \| Research and Development
Income Taxes [Line Items]
Tax credit carryforwards						$ 800,000	$ 600,000
Tax credit carryforwards expiration year						2037

Income Taxes - Schedule of Reconciliation of Income Tax Expense (Benefit) (Details)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income taxes at U.S. statutory rate	21.00%	21.00%
State income taxes	15.00%	6.00%
Permanent items	(3.20%)	0.00%
Tax Credit	(142.90%)	5.00%
Equity Compensation	70.90%	0.00%
Other	0.10%	0.00%
Change in valuation allowance	44.70%	(32.00%)
Total provision for income taxes	5.60%	0.00%

Income Taxes - Schedule of Components of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Deferred tax assets
Net operating loss carryforwards	$ 32,931	$ 37,411
Tax credits carryforwards	8,930	6,968
Capitalized Sec. 174 Costs	4,591
Stock-based compensation	673	1,268
Amortization	323	493
Accruals		545
Lease liability		175
Unrealized gains/losses on investments		4
Other	5	31
Total deferred tax assets	47,453	46,895
Valuation allowance	$ (47,453)	(46,742)
Net deferred tax assets		153
Deferred tax liabilities
Tenant improvement allowance		(12)
Right of Use Asset		(141)
Total deferred tax liabilities		$ (153)

Net Income (Loss) Per Share - Computation of Basic and Diluted Net Income (Loss) Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Numerator:
Net income (loss) attributable to common stockholders—basic and diluted	$ 1,488	$ (51,384)
Denominator:
Weighted-average common shares outstanding—basic	26,287,264	21,661,450
Weighted-average common shares outstanding—diluted	26,385,567	21,661,450
Net income (loss) per share applicable to common stockholders—basic	$ 0.06	$ (2.37)
Net income (loss) per share applicable to common stockholders—diluted	$ 0.06	$ (2.37)

- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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+ Details

- Definition

The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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+ Details

Net Income (Loss) Per Share - Anti Dilutive Potential Common Shares Excluded From Computation of Diluted Net Income (Loss) Per Share (Details) - shares	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Unvested Restricted Shares
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per common share	124,768
Options to Purchase Common Stock
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per common share	1,740,158	2,373,024
Shares reserved for future issuance under the ESPP
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]
Anti-dilutive securities excluded from computation of diluted net loss per common share		175,667

Related Party Transactions - Additional Information (Details) - USD ($)			12 Months Ended		81 Months Ended
	Jul. 16, 2021	Mar. 16, 2020	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2019	Apr. 30, 2016
Related Party Transaction [Line Items]
Number of common stock purchased	8,333,333		0
Common stock, shares issued			26,287,264	26,287,264	26,287,264
Lundbeckfond Invest A/S
Related Party Transaction [Line Items]
Ownership interest percentage			5.10%	5.00%	5.10%
Lundbeckfond Invest A/S \| IPO \| Common Stock
Related Party Transaction [Line Items]
Number of common stock purchased		187,500
Lundbeck \| Lundbeck Agreement
Related Party Transaction [Line Items]
Ownership interest percentage			1.90%	1.80%	1.90%
Common stock, shares issued						443,271	167,523
Upfront and ongoing milestone payments				$ 0
Lundbeck \| Lundbeck Agreement \| Research and Development Expense
Related Party Transaction [Line Items]
Upfront and ongoing milestone payments			$ 300,000		$ 2,000,000.0
Series A Preferred Stock \| Lundbeckfond Invest A/S
Related Party Transaction [Line Items]
Shares owned						5,470,492
Series A Preferred Stock \| Lundbeck \| Lundbeck Agreement
Related Party Transaction [Line Items]
Shares owned						499,069
Series Seed Convertible Preferred Stock \| Lundbeckfond Invest A/S
Related Party Transaction [Line Items]
Shares owned						478,749
Series B Preferred Stock \| Lundbeckfond Invest A/S
Related Party Transaction [Line Items]
Shares owned						1,326,111

Benefit Plans - Additional Information (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Defined Contribution Savings Plan
Defined Contribution Plan Disclosure [Line Items]
Contribution to defined contribution savings plan	$ 0.1	$ 0.2