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Summary of Significant Accounting Policies | 12 Months Ended
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Dec. 31, 2024
Accounting Policies [Abstract] |
Summary of Significant Accounting Policies | 3. Summary of Significant Accounting Policies Basis of Presentation The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America, or U.S. GAAP. Use of Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenue and expenses during the reporting period. Although the Company regularly assesses these estimates, actual results could differ from those estimates. Changes in estimates are recorded in the period in which they become known. The Company’s most significant estimates and judgments used in the preparation of the financial statements are: • Clinical trial expenses and other research and development expenses; • Collaboration agreements; • Fair value measurements of stock-based compensation; and • Income taxes. Cash and Cash Equivalents Cash equivalents consist primarily of demand deposit accounts, certificates of deposit and deposits in short-term U.S. treasury money market mutual funds. Cash equivalents are stated at cost, which approximates fair market value. Concentrations of Credit Risk Financial instruments which potentially subject the Company to concentrations of credit risk consist principally of cash and cash equivalents. The Company maintains cash accounts in commercial banks, which may, at times, exceed federally insured limits. The Company has not experienced any losses in such accounts. The Company believes it is not exposed to any significant credit risk on cash and cash equivalents. Property and Equipment Property and equipment are stated at cost, less accumulated depreciation and amortization. Expenditures for maintenance and repairs are charged to expense while the costs of significant improvements are capitalized. Depreciation and amortization is calculated on a straight-line basis using the following periods, which represent the estimated useful lives of the assets:
Office and computer equipment |  | 3 years
Software |  | 3 years
Laboratory equipment |  | 5 years
Leasehold improvements |  | Life of the lease
Costs, including certain design, construction and installation costs related to assets that are under construction and are in the process of being readied for their intended use, are recorded as construction in progress and are not depreciated until such time as the subject asset is placed in service. Repairs and maintenance that do not extend the useful life of the asset are expensed as incurred. Upon sale, retirement or other disposition of these assets, the costs and related accumulated depreciation are removed from the respective accounts and any gain or loss on the disposition is included in the statements of operations. Long-Lived Assets Assessments of long-lived assets and the remaining useful lives of such long-lived assets are reviewed for impairment whenever a triggering event occurs or changes in circumstances indicate that the carrying amount of the assets may not be recoverable. An asset, or group of assets, is considered to be impaired when the undiscounted estimated net cash flows expected to be generated by the asset, or group of assets, are less than its carrying amount. The impairment recognized is the amount by which the carrying amount exceeds the fair market value of the impaired asset, or group of assets, based on the present value of the expected future cash flows associated with the use of the asset. During the year ended December 31, 2023, the Company recorded impairment charge of $4.8 million, which was primarily related to leasehold improvements of $3.8 million and lab equipment of $1.0 million. Operating Segments Operating segments are identified as components of an enterprise for which separate discrete financial information is available for evaluation by the Company’s chief operating decision maker (“CODM”) and relied upon when making decisions regarding resource allocation and assessing performance. When evaluating the Company’s financial performance, the CODM reviews total revenues, total expenses, and expenses by functional classification; using this information to make decisions on a company-wide basis. The Company views its operations and manages its business in one operating segment. Warrants The Company assesses whether warrants issued require accounting as derivatives. The Company determined that the warrants were (1) indexed to the Company’s own stock and (2) classified in stockholders’ equity in accordance with Financial Accounting Standards Board, or FASB, ASC Topic 815, Derivatives and Hedging. As such, the Company has concluded the warrants meet the scope exception for determining whether the instruments require accounting as derivatives and should be classified in stockholders’ equity. Fair Value Measurements The Company has certain financial assets and liabilities recorded at fair value which have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the accounting standards for fair value measurements. • Level 1—Quoted prices in active markets for identical assets or liabilities. • Level 2—Inputs other than Level 1 that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. • Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities. Assets and liabilities measured at fair value on a recurring and nonrecurring basis as of December 31, 2024 and 2023 are as follows:
($ in thousands) |  |  |  |  | Fair Value Measurements at Reporting Date Using |
Description |  | Balance as of December 31, 2024 |  |  | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash equivalents |  | $ | 779 |  |  | $ | 779 |  |  | $ | — |  |  | $ | — |
($ in thousands) |  |  |  |  | Fair Value Measurements at Reporting Date Using |
Description |  | Balance as of December 31, 2023 |  |  | Quoted Prices in Active Markets for Identical Assets/Liabilities (Level 1) |  |  | Significant Other Observable Inputs (Level 2) |  |  | Significant Unobservable Inputs (Level 3) |
Cash equivalents |  | $ | 5,744 |  |  | $ | 5,744 |  |  | $ | — |  |  | $ | — |
The cash equivalents represent demand deposit accounts and deposits in a short-term United States treasury money market mutual fund quoted in an active market and classified as a Level 1 asset. There have been no changes to the valuation methods during the years ended December 31, 2024 and 2023. The Company had no financial assets or liabilities that were classified as Level 2 or Level 3 during the years ended December 31, 2024 and 2023. Revenue Recognition from Collaboration Agreements Revenue for the year ended December 31, 2024 consisted of $10 thousand and for the year ended December 31, 2023 consisted of $5 thousand. For the years ended December 31, 2024 and 2023, the Company recognized revenue through its Collaboration Agreement with Solasia Pharma K.K. primarily due to the achievement of milestones, as further described in Note 9, Commitments and Contingencies. Research and Development Costs As part of the process of preparing the Company's financial statements, the Company is required to estimate its accrued research and development expenses. This process involves reviewing open contracts and purchase orders, communicating with its personnel and third-party vendors to identify services that have been performed on its behalf and estimating the level of service performed and the associated costs incurred for the services when the Company has not yet been invoiced or otherwise notified of the actual costs. The majority of the Company's service providers invoice the Company in arrears for services performed, on a predetermined schedule or when contractual milestones are met; however, a few require advanced payments. The Company makes estimates of its accrued expenses as of each balance sheet date in its financial statements based on facts and circumstances known to it at that time. Examples of estimated accrued research and development expenses include fees paid to: • clinical research organizations, or CROs, in connection with performing research services on its behalf and clinical trials; • investigative sites or other providers in connection with clinical trials; • vendors in connection with preclinical and clinical development activities; and • vendors related to product manufacturing, development, and distribution of preclinical and clinical supplies. The Company bases its expenses related to preclinical studies and clinical trials on its estimates of the services received and efforts expended pursuant to quotes and contracts with CROs that conduct and manage clinical trials on its behalf. The financial terms of these agreements are subject to negotiation, vary from contract to contract and may result in uneven payment flows. There may be instances in which payments made to the Company's vendors will exceed the level of services provided and result in a prepayment of the clinical expense. Payments under some of these contracts depend on factors such as the completion of clinical trial milestones. In accruing service fees, the Company estimates the time period over which services will be performed, enrollment of patients, number of sites activated and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from its estimate, the Company adjusts the accrual or amount of prepaid expense accordingly. Although the Company does not expect its estimates to be materially different from amounts actually incurred, its understanding of the status and timing of services performed relative to the actual status and timing of services performed may vary and may result in it reporting amounts that are too high or too low in any particular period. Income Taxes Income taxes are accounted for under the liability method. Deferred tax assets and liabilities are recognized for the estimated future tax consequences of temporary differences between the financial statement carrying amounts and their respective tax bases. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the year in which the temporary differences are expected to be recovered or settled. The Company evaluates the realizability of its deferred tax assets and establishes a valuation allowance when it is more likely than not that all or a portion of deferred tax assets will not be realized. The Company accounts for uncertain tax positions using a “more-likely-than-not” threshold for recognizing and resolving uncertain tax positions. The evaluation of uncertain tax positions is based on factors including, but not limited to, changes in tax law, the measurement of tax positions taken or expected to be taken in tax returns, the effective settlement of matters subject to audit, new audit activity and changes in facts or circumstances related to a tax position. The Company evaluates this tax position on an annual basis. The Company also accrues for potential interest and penalties related to unrecognized tax benefits in income tax expense (Refer to Note 12, Income Taxes). Accounting for Stock-Based Compensation Stock-based compensation cost is measured at the grant date based on the estimated fair value of the award and is recognized as expense over the employee’s requisite service period. Stock-based compensation expense is based on the number of awards ultimately expected to vest and is reduced for forfeitures as they occur. Consistent with prior years, the Company uses the Black-Scholes option pricing model, which requires estimates of the expected term option holders will retain their options before exercising them and the estimated volatility of the Company’s common stock price over the expected term. The Company recognized the full impact of its share-based employee payment plans in the statements of operations for each of the years ended December 31, 2024 and 2023 and did not capitalize any such costs on the balance sheets. The Company recognized $0.4 million of compensation expense related to stock options for the year ended December 31, 2024 and $2.5 million of compensation expense related to stock options for the year ended December 31, 2023. The Company recognized $0.0 million of compensation expense related to restricted stock for the year ended December 31, 2024 and $0.3 million for the year ended December 31, 2023 (refer to Note 13, Stock Option Plan). The total compensation expense relating to vesting of stock options and restricted stock awards for the year ended December 31, 2024 was $0.4 million and $2.8 million for the year ended December 31, 2023. The following table presents share-based compensation expense included in the Company’s statements of operations:
| For the Year Ended December 31, |
(in thousands) | 2024 |  |  | 2023 |
Research and development | $ | 17 |  |  | $ | 439 |
General and administrative |  | 418 |  |  |  | 2,361 |
Stock-based compensation expense | $ | 435 |  |  | $ | 2,800 |
The fair value of each stock option is estimated at the date of grant using the Black-Scholes option pricing model. Assumptions regarding volatility, expected term, dividend yield and risk-free interest rate are required for the Black-Scholes model. The volatility assumption is based on the historical experience. The Company calculated expected term using the simplified method described in SEC Staff Accounting Bulletin, or SAB, No. 107 and No. 110. Reverse Stock Splits On January 31, 2024, the Company filed a Second Amended and Restated Certificate of Incorporation (the “Charter Amendment”) with the Secretary of State of the State of Delaware in order to effect a reverse stock split of the Company’s common stock at a ratio of 1-for-15 (the “Reverse Split”). The Charter Amendment decreased the number of authorized shares of common stock from 520,000,000 to 34,666,667. The Charter Amendment does not affect the par value of the Company’s common stock or change the number of authorized shares or par value of the Company’s preferred stock. The Charter Amendment became effective on January 31, 2024. On July 17, 2024, the Company filed a Third Amended and Restated Certificate of Incorporation or Third Charter Amendment with the Secretary of State of the State of Delaware in order to effect a reverse stock split of the Company’s common stock at a ratio of 1-for-10 (the "Second reverse Split", the "Reverse Splits") or the Second Reverse Split, collectively the Reverse Splits. The Third Charter Amendment decreased the number of authorized shares of common stock from 34,666,667 to 5,000,000. The Third Charter Amendment does not affect the par value of the Company’s common stock or change the number of authorized shares or par value of the Company’s preferred stock. The Third Charter Amendment became effective on July 17, 2024. No fractional shares were issued in connection with the Reverse Splits. Stockholders of record who would otherwise have been entitled to receive fractional shares as a result of the Reverse Splits received a cash payment in lieu thereof at a price equal to the fraction to which the stockholder would otherwise be entitled multiplied by the closing sales price per share of the common stock (as adjusted for the Reverse Splits) on the Nasdaq Capital Market on January 31, 2024 and July 17, 2024. All share and per share amounts of common stock, options, warrants, and restricted stock in the accompanying financial statements and notes thereto have been retroactively adjusted for all periods presented to reflect the Reverse Splits as if they had occurred at the beginning of the earliest period presented. Net Loss per Share Basic net loss per common share is computed by dividing net loss applicable to common stockholders by the weighted average number of shares of common stock outstanding for the period. Diluted net loss per share is computed using the weighted-average number of shares of common stock outstanding during the period, plus the dilutive effect of outstanding options and warrants, using the treasury stock method and the average market price of the Company’s common stock during the applicable period, unless their effect on net loss per share is antidilutive. The effect of computing diluted net loss per common share was antidilutive for any potentially issuable shares of common stock from the conversion of stock options, unvested restricted stock and warrants and, as such, have been excluded from the calculation. Certain shares related to some of the Company’s outstanding common stock options, unvested restricted stock and warrants have not been included in the computation of diluted net loss per share for the years ended December 31, 2024 and 2023 as the result would be antidilutive. Such potential common shares on December 31, 2024 and 2023 consist of the following:
|  | December 31, |
|  | 2024 |  |  | 2023 |
Common stock options |  |  | 33,237 |  |  |  | 46,589 |
Warrants |  |  | 26,555 |  |  |  | 145,239 |
|  |  | 59,792 |  |  |  | 191,828 |
New Accounting Pronouncements In November 2023, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) No. 2023-07, “Improvements to Reportable Segment Disclosures (Topic 280)” which is intended to improve reportable segment disclosure requirements, primarily through incremental disclosures of segment information on an annual and interim basis for all public entities. The ASU expands public entities’ segment disclosures by requiring disclosure of significant segment expenses that are regularly provided to the chief operating decision maker and included within each reported measure of segment profit or loss, an amount and description of its composition for other segment items and interim disclosures of a reportable segment’s profit or loss and assets. The ASU is effective for our Annual Report on Form 10-K for the fiscal year ended December 31, 2024, and interim periods thereafter with and before it has been applied retrospectively to all prior periods presented. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, which is intended to enhance the transparency and decision usefulness of income tax disclosures. The amendments in ASU 2023-09 provide for enhanced income tax information primarily through changes to the rate reconciliation and income taxes paid information. ASU 2023-09 is effective for the Company prospectively to all annual periods beginning after December 15, 2024. Early adoption is permitted. The Company is currently evaluating the impact of this standard.

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