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Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Basis of presentation | Basis of presentation The accompanying financial statements have been prepared in accordance with accounting principles generally accepted (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 (ASC) and Accounting Standards Updates (ASU) promulgated by the Financial Accounting Standards Board (FASB). These unaudited interim 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, as filed with the Securities and Exchange Commission (SEC) on March 12, 2025. The accompanying interim financial statements as of September 30, 2025 and for the three and nine months ended September 30, 2025 and 2024 are unaudited but 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. Balance sheet amounts as of December 31, 2024 have been derived from the audited financial statements as of that date. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities as of the date of the financial statements and reported amounts of revenues and expenses during the reporting period. Such estimates include accruals of research and development expenses, accrued costs for services rendered under agreements with third-party contract research organizations (CROs) and stock option valuations and stock-based compensation. On an ongoing basis, the Company evaluates its estimates and judgments, which are based on historical and anticipated results and trends and on various other assumptions that management believes to be reasonable under the circumstances. Actual results could differ from those estimates.
Emerging growth company status | Emerging growth company status The Company is an emerging growth company (EGC) as defined in the Jumpstart Our Business Startups Acts of 2012, as amended (the JOBS Act), and may take advantage of certain exemptions from various reporting requirements that are applicable to other public companies that are not EGCs. The Company may take advantage of these exemptions until it is no longer an EGC under Section 107 of the JOBS Act and has elected to use the extended transition period for complying with new or revised accounting standards. As a result of this election, the Company’s financial statements may not be comparable to those issued by companies that comply with the effective dates pursuant to public company FASB standards.
Liquidity | Liquidity The accompanying unaudited financial statements have been prepared assuming the Company will continue as a going concern, which contemplates continuity of operations, realization of assets and the satisfaction of liabilities and commitments in the normal course of business. The Company will require substantial additional capital to fund its research and development and ongoing operating expenses. As of September 30, 2025, the Company has relied on public and private equity and debt financings and proceeds from licensing arrangements to fund its operations. The Company has incurred recurring losses and negative cash flows from operations since inception, and, as of September 30, 2025, had an accumulated deficit of $336.8 million and cash, cash equivalents and marketable securities of $125.5 million. The Company expects to incur additional losses and negative cash flows from operations for the foreseeable future. In July and August 2023, the Company completed its initial public offering (IPO) and, inclusive of the partial exercise of the underwriters’ overallotment option, the Company sold an aggregate of 6,026,772 shares of Series A common stock at a public offering price of $16.00 per share and received $86.2 million in net proceeds. In January 2024, the Company completed a follow-on offering whereby it sold 9,000,000 shares of its Series A common stock at a price of $12.50 per share and received $104.7 million in proceeds, net of issuance costs of $7.8 million. In August 2024, the Company entered into a Controlled Equity Offering Sales Agreement with Cantor Fitzgerald & Co. to establish an at-the-market offering (2024 ATM Offering) through which the Company may sell, from time to time at its sole discretion, up to $75.0 million shares of its Series A common stock. In connection with the establishment of the 2025 ATM Offering (as defined below), the Company terminated the 2024 ATM Offering. No shares of Series A common stock were sold under the 2024 ATM Offering prior to such termination. ​ In August 2025, the Company entered into a Sales Agreement with Leerink Partners LLC to establish an at-the-market offering (2025 ATM Offering) through which the Company may sell, from time to time at its sole discretion, up to $75.0 million shares of its Series A common stock. There were no sales under the 2025 ATM Offering during the three months ended September 30, 2025. ​ The Company expects that its cash, cash equivalents and marketable securities as of September 30, 2025 will be sufficient to fund the Company’s operating expenses for at least the next 12 months from the issuance of these financial statements. In the future, the Company will need to raise additional funds until it is able to generate sufficient revenues to fund its development activities. The Company’s future operating activities, coupled with its plans to raise capital or issue debt financing, may provide additional liquidity in the future, however these actions are not solely within the control of the Company, and the Company is unable to predict the outcome of these actions to generate the liquidity ultimately required.
Net loss per share attributable to common stockholders | Net loss per share attributable to common stockholders Basic and diluted net loss per share is computed using the two-class method required for multiple classes of common stock and participating securities. The Company’s participating securities do not have a contractual obligation to share in the Company’s losses. As such, the net loss was attributed entirely to common stockholders for all periods presented. Basic net loss per common share attributable to common stockholders is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period, without consideration of potentially dilutive securities. Diluted net loss per share attributable to common stockholders is computed by dividing the net loss by the weighted-average number of common shares and potentially dilutive securities outstanding for the period. For purposes of the diluted net loss per share attributable to common stockholders’ calculation, common stock options, restricted stock units and common stock warrants are considered to be potentially dilutive securities. As the Company has reported a net loss for the periods presented, basic and diluted net loss per share attributable to common stockholders is the same as all potentially dilutive securities would have an anti-dilutive impact. The following table presents the calculation of basic and diluted net loss per share for the three and nine months ended September 30, 2025 and 2024 (in thousands, except share and per share data): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ | ​ | 2025 | ​ | 2024 | ​ | 2025 |  | 2024
Numerator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Net loss | ​ | $ | (12,908) | ​ | $ | (14,619) | ​ | $ | (41,470) | ​ | $ | (29,366)
Denominator: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares of Series A and Series B common stock outstanding, basic and diluted | ​ |  | 32,464,893 | ​ |  | 32,143,336 | ​ |  | 32,286,188 | ​ |  | 31,036,271
Net loss per share of Series A and Series B common stock outstanding, basic and diluted | ​ | $ | (0.40) | ​ | $ | (0.45) | ​ | $ | (1.28) | ​ | $ | (0.95)
​ The following potentially dilutive securities have been excluded from the computation of diluted weighted-average shares of Series A and Series B common stock outstanding, as their effect would have been anti-dilutive: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended September 30, | ​ | Nine Months Ended September 30,
​ |  | 2025 |  | 2024 |  | 2025 |  | 2024
Options to purchase Series A common stock | ​ | 5,694,175 | ​ | 4,322,367 | ​ | 5,694,175 | ​ | 4,322,367
Warrants to purchase Series A common stock | ​ | 1,000 | ​ | 1,000 | ​ | 1,000 | ​ | 1,000
Restricted stock units | ​ | 816,937 | ​ | 844,382 | ​ | 816,937 | ​ | 844,382
Total |  | 6,512,112 |  | 5,167,749 |  | 6,512,112 |  | 5,167,749
New accounting pronouncements not yet adopted | New accounting pronouncements not yet adopted The Company considers the applicability and impact of all ASUs. ASUs not discussed below were assessed and either determined to be not applicable or expected to have a minimal impact on the Company’s financial statements. In November 2024, the FASB issued ASU 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses, which requires public business entities to disclose, for interim and annual reporting periods, additional information about certain income statement expense categories. ASU 2024-03 is effective for annual periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Early adoption is permitted and is effective on either a prospective basis or retrospective basis. The Company is currently evaluating the impact of the adoption of this standard on its financial statements and related disclosures. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740) - Improvements to Income Tax Disclosures, a final standard on improvements to income tax disclosures. The standard requires disaggregated information about a reporting entity's effective tax rate reconciliation as well as information on income taxes paid. The standard is intended to benefit investors by providing more detailed income tax disclosures that would be useful in making capital allocation decisions and applies to all entities subject to income taxes. The new standard is effective for annual periods beginning after December 15, 2024. The Company is currently evaluating the impact of the adoption of this standard on its disclosures and will adopt the ASU for its Annual Report on Form 10-K for the year ended December 31, 2025. One Big Beautiful Bill Act On July 4, 2025, the One Big Beautiful Bill Act (OBBBA) was enacted in the United States. The OBBBA includes significant provisions, such as the permanent extension of certain expiring provisions of the Tax Cuts and Jobs Act and modifications to capitalization of research and development expenses, among others. The legislation has multiple effective dates, with certain provisions effective in 2025 and others implemented through 2027. The Company is currently in the process of assessing the potential impact of this legislation on its deferred tax assets, financial statements and related disclosures.

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