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Summary of significant accounting policies (Policies) | 6 Months Ended
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Jun. 30, 2023
Summary of significant accounting policies |
Basis of presentation | Basis of presentation The accompanying financial statements have been prepared in accordance with accounting principles generally accepted, or GAAP, in the United States. Any reference in these notes to applicable guidance is meant to refer to GAAP as found in the Accounting Standards Codification, or ASC, and Accounting Standards Updates, or ASU, promulgated by the Financial Accounting Standards Board, or FASB.
Unaudited interim results | Unaudited interim results These unaudited condensed financial statements and accompanying notes should be read in conjunction with the Company’s annual financial statements and the notes thereto included in the Company’s Form 10-K filed with the Securities and Exchange Commission on March 16, 2023. The accompanying condensed financial statements as of June 30, 2023 and for the three and six months ended June 30, 2023 and 2022 are unaudited but have been prepared on the same basis as the annual audited financial statements and include all adjustments that management believes to be necessary for a fair presentation of the periods presented. Interim results are not necessarily indicative of results for a full year. Condensed balance sheet amounts as of December 31, 2022 have been derived from the audited financial statements as of that date.
Use of estimates | Use of estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets, liabilities and expenses. The Company bases its estimates and assumptions on historical experience when available and on various factors that it believes to be reasonable under the circumstances. Significant estimates and assumptions reflected in these condensed financial statements include, but are not limited to, the expected volatility used to estimate fair value of stock options, accrued research and development expenses, and the estimated costs which drive the revenue recognition for the Collaboration Agreement with AbbVie. Estimates and assumptions are periodically reviewed in light of changes in circumstances, facts and experience. Changes in estimates are recorded in the period in which they become known. Actual results could differ from these estimates.
Segment and geographic information | Segment and geographic information Operating segments are defined as components of an entity about which separate discrete information is available for evaluation by the chief operating decision maker, or the CODM, or decision-making group, in deciding how to allocate resources and in assessing performance. The CODM is the Company’s Chief Executive Officer. The Company views its operations as, and manages its business in, one operating segment operating exclusively in the United States of America.
Fair value of financial instruments | Fair value of financial instruments ASC Topic 820, Fair Value Measurement, or ASC 820, establishes a fair value hierarchy for instruments measured at fair value that distinguishes between assumptions based on market data (observable inputs) and the Company’s own assumptions (unobservable inputs). Observable inputs are inputs that market participants would use in pricing the asset or liability based on market data obtained from sources independent of the Company. Unobservable inputs are inputs that reflect the Company’s assumptions about the inputs that market participants would use in pricing the assets or liability and are developed based on the best information available in the circumstances. ASC 820 identifies fair value as the price that would be received to sell an asset or paid to transfer a liability, in an orderly transaction between market participants at the measurement date. As a basis for considering market participant assumptions in fair value measurements, ASC 820 establishes a three-tiered value hierarchy that distinguishes between the following: Level 1 — Quoted market prices in active markets for identical assets or liabilities. Level 2 — Inputs other than Level 1 inputs that are either directly or indirectly observable, such as quoted market prices, interest rates and yield curves. Level 3 — Unobservable inputs for the asset or liability (i.e.; supported by little or no market activity). Level 3 inputs include management’s own assumptions about the assumptions that market participants would use in pricing the asset or liability (including assumptions about risk). To the extent the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgement. Accordingly, the degree of judgement exercised by the Company in determining fair value is greatest for instruments categorized as 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. Cash and cash equivalents and restricted cash are Level 1 assets as of June 30, 2023 and December 31, 2022.
Restricted cash | Restricted cash Restricted cash represents collateral provided for a letter of credit issued as a security deposit in connection with the Company’s lease of its corporate facilities. Cash will be released from restriction upon termination of the lease. Restricted cash was $0.1 million at both June 30, 2023 and 2022, respectively. The following table provides a reconciliation of the components of cash and cash equivalents and restricted cash presented in the condensed statements of cash flows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
(in thousands) | ​ | June 30, 2023 | ​ | June 30, 2022
Cash and cash equivalents | ​ | $ | 38,416 | ​ | $ | 34,649
Restricted cash | ​ | ​ | 100 | ​ | ​ | 100
​ | ​ | $ | 38,516 | ​ | $ | 34,749
Concentration of credit risk | Concentration of credit risk Financial instruments that potentially subject the Company to significant concentration of credit risk consist primarily of cash and cash equivalents. The Company maintains deposits in a financial institution in excess of government insured limits. Management believes that the Company is not exposed to significant credit risk as the Company’s deposits are held at a financial institution that management believes to be of high credit quality, and the Company has not experienced any losses on these deposits.
Equity issuance costs | Equity issuance costs The Company capitalized costs that were directly associated with establishing the ATM Agreement and shelf registration statement in 2021. These costs will remain capitalized until such financings are consummated, at which time such costs will be recorded against the gross proceeds from the applicable financing. If a financing is abandoned, deferred offering costs are expensed. Ongoing costs that are directly associated with the ATM Agreement are expensed as incurred. The Company also capitalized costs that were directly associated with the PIPE transaction. These costs will remain capitalized until such transaction is consummated, at which time such costs will be recorded against the gross proceeds from the applicable financing. Deferred offering costs were $0.4 million as of June 30, 2023 and $0.3 million as of December 31, 2022 on the condensed balance sheets.
Government assistance programs | Government assistance programs The Company accounts for amounts received under its DoD expense reimbursement contract as contra-research and development expenses in the condensed statements of operations. The Company accounts for the employee retention credit received under the U.S. Department of Treasury Coronavirus Aid, Relief, and Economic Security Act, or CARES Act, as contra-expense to personnel related costs within research and development and general administrative expenses in the condensed statements of operations.
Collaboration revenue | Collaboration revenue The Company evaluates its collaborative arrangements pursuant to ASC 808, Collaborative Arrangements, or ASC 808, and ASC 606, Revenue from Contracts with Customers, or ASC 606. The Company considers the nature and contractual terms of collaborative arrangements and assesses whether the arrangement involves a joint operating activity pursuant to which the Company is an active participant and is exposed to significant risks and rewards with respect to the arrangement. If the Company is an active participant and is exposed to significant risks and rewards with respect to the arrangement, the Company accounts for the arrangement as a collaboration under ASC 808. If it is not exposed to significant risks and rewards and the contract is with a customer, the Company accounts for the collaboration under ASC 606. Payments pursuant to collaborative arrangements may include non-refundable upfront payments, research option and license option payments, milestone payments upon the achievement of significant regulatory and development events, commercial sales milestones, and royalties on product sales. The amount of variable consideration is constrained until it is probable that the revenue is not at a significant risk of reversal in a future period. In determining the appropriate amount of revenue to be recognized as the Company fulfills its obligations under a collaboration arrangement, the Company applies the five-step model of ASC 606: (i) identify the contract with a customer; (ii) identify the performance obligations in the contract, including whether they are capable of being distinct; (iii) determine the transaction price, including the constraint on variable consideration; (iv) allocate the transaction price to the performance obligations; and (v) recognize revenue when (or as) the entity satisfies a performance obligation. The Company applies significant judgment when evaluating whether contractual obligations represent distinct performance obligations, allocating transaction price to performance obligations within a contract, determining when performance obligations have been met, and assessing the recognition of variable consideration. When consideration is received prior to the Company completing its performance obligation under the terms of a contract, a contract liability is recorded as deferred revenue. Deferred revenue expected to be recognized as revenue within the twelve months following the balance sheet date is classified as a current liability. In January 2023, the Company entered into the Collaboration Agreement with AbbVie, which was determined to be within the scope of ASC 606. Please see Note 3 for further information related to the accounting for the Collaboration Agreement.
Research and development costs | Research and development costs Research and development costs are charged to expense as incurred. Research and development costs consist of costs incurred in performing research and development activities, including salaries and bonuses, share-based compensation, employee benefits, facilities costs, laboratory supplies, depreciation and amortization, preclinical and clinical development expenses, including manufacture and testing of clinical supplies, consulting and other contracted services. Additionally, under the terms of the license agreements described in Note 7, the Company is obligated to make future payments should certain development and regulatory milestones be achieved. Costs for certain research and development activities are recognized based on the terms of the individual arrangements, which may differ from the timing of receipt of invoices and payment of invoices and are reflected in the condensed financial statements as a prepaid or accrued expense.
Share-based compensation | Share-based compensation The Company’s share-based compensation program allows for grants of stock options and restricted stock awards. Grants are awarded to employees and non-employees, including directors. The Company accounts for its share-based compensation awards granted to employees and nonemployees based on the estimated fair value on the date of grant and recognized compensation expense of those awards over the requisite service period, which is the vesting period of the respective award. The Company accounts for forfeitures as they occur. For share-based awards with service-based vesting conditions, the Company recognized compensation expense on a straight-line basis over the service period. The Company classified share-based compensation expense in its statements of operations in the same manner in which the award recipient’s payroll costs are classified or in which the award recipient’s service payments are classified. The Company estimates the fair value of options granted using the Black-Scholes option pricing model for stock option grants to both employees and non-employees. The Black-Scholes option pricing model requires inputs based on certain subjective assumptions, including (i) the expected stock price volatility, (ii) the expected term of the award, (iii) the risk-free interest rate and (iv) expected dividends. Due to the lack of Company-specific historical and implied volatility data, the Company has based its computation of expected volatility on the historical volatility of a representative group of public companies with similar characteristics to the Company, including stage of product development and biopharmaceutical industry focus. The historical volatility is calculated based on a period of time commensurate with the expected term assumption. The Company uses the simplified method to calculate the expected term for options granted to employees and non-employees whereby, the expected term equals the arithmetic average of the vesting term and the original contractual term of the options due to its lack of sufficient historical data. The risk-free interest rate is based on U.S. Treasury securities with a maturity date commensurate with the expected term of the associated award. The expected dividend yield is assumed to be zero as the Company has never paid dividends and has no current plans to pay any dividends on its common stock. The exercise price is the fair value of the common stock as of the measurement date.
Net loss per share | Net loss per share Basic net loss per share of common stock is computed by dividing the net loss attributable to common stockholders by the weighted average number of common shares outstanding for the period. Diluted net loss per share of common stock is computed by adjusting net loss attributable to common stockholders to reallocate undistributed earnings based on the potential impact of dilutive securities. Diluted net loss per share of common stock is computed by dividing the diluted net loss by the weighted average number of common shares outstanding for the period, including potential dilutive common shares assuming the dilutive effect of common stock equivalents. The following potentially dilutive securities outstanding as of June 30, 2023 and 2022 have been excluded from the computation of diluted weighted-average shares of common stock outstanding, as they would be anti-dilutive: ​
​ | ​ | ​ | ​ | ​
​ | ​ | June 30,
​ |  | 2023 | ​ | 2022
Stock options(1) | ​ | 3,038,080 | ​ | 2,532,644
Common stock warrants(1) | ​ | 500,000 | ​ | 1,303,112
Unvested restricted stock awards (1) | ​ | 2,083 | ​ | —
​ | ​ | 3,540,163 | ​ | 3,835,756
(1) | Represents common stock equivalents.
​ In periods in which the Company reports a net loss per share of common stock, diluted net loss per share of common stock is the same as basic net loss per share of common stock since dilutive common shares are not assumed to have been issued if their effect is anti-dilutive. The Company reported a net loss per share of common stock for the three and six months ended June 30, 2023 and 2022.
Leases | Leases The Company accounts for leases in accordance with ASC 842, Leases. At the inception of an arrangement, the Company determines whether an arrangement contains a lease based on facts and circumstances present in the arrangement. An arrangement is or contains a lease if the arrangement conveys the right to control the use of an identified asset for a period of time in exchange for consideration. Typically, lessees are required to recognize leases with a term greater than one year on the condensed balance sheets as an operating or finance lease liability and right-of-use asset. Right-of-use assets represent the Company’s right to use an underlying asset during the lease term and lease liabilities represent our obligation to make lease payments arising from the lease. The Company has elected the practical expedient to not recognize leases with a term of 12 months or less. The Company does not have any financing leases as of June 30, 2023. Operating lease liabilities and their corresponding right-of-use assets are recorded based on their present value of lease payments over the remaining lease term. Options to extend the lease term are included in the Company’s assessment of the lease term only if there is a reasonable assessment that the Company will renew. Leases are discounted to its present value using either the interest rate implicit in the Company’s lease or its incremental borrowing rate, which reflects the fixed rate in which the Company could borrow on a collateralized basis the amount of lease payments in the same currency, for a similar term, in a similar economic environment.
Recently adopted accounting standard | Recently adopted accounting standard On January 1, 2023, the Company adopted ASU No. 2016-13, Measurement of Credit Losses on Financial Instruments. This standard amended its guidance on the recognition of impairment losses of certain financial instruments. The ASU established the current expected credit loss model, which is based on expected losses rather than incurred losses. Adoption of this standard had no impact on the Company’s condensed financial statements.

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