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Summary of Significant Accounting Policies (Policies) | 9 Months Ended
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Sep. 30, 2025
Accounting Policies [Abstract] |
Background and Basis of Presentation | These condensed consolidated financial statements reflect, in the opinion of management, all adjustments of a normal and recurring nature that are necessary for a fair statement of the Company’s financial position as of September 30, 2025, its results of operations for the three and nine months ended September 30, 2025 and for the period from September 19, 2024 (inception) through September 30, 2024, and its cash flows for the nine months ended September 30, 2025 and for the period from September 19, 2024 (inception) through September 30, 2024. The condensed balance sheet as of December 31, 2024, included in the condensed consolidated balance sheets was derived from the Company’s audited financial statements. The condensed consolidated financial statements and accompanying notes are prepared in accordance with United States (“U.S.”) generally accepted accounting principles (“GAAP”) for interim financial reporting and the rules and regulations of the U.S. Securities and Exchange Commission (the “SEC”) and therefore do not include all information and disclosures normally included in the annual financial statements.
Use of Estimates | The preparation of the Company’s financial statements in conformity with U.S. GAAP requires management to make estimates, assumptions, and judgments that affect the reported amounts of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of expenses during the reporting periods. Significant estimates and assumptions reflected within these financial statements include but are not limited to research and development expenses and any applicable prepaid or accrued costs and the valuation of share-based compensation awards and related expenses. The Company bases its estimates on known trends and other market-specific or other relevant factors that it believes to be reasonable under the circumstances. On an ongoing basis, management evaluates its estimates, as there are changes in circumstances, facts, and experience. Actual results may differ materially from those estimates or assumptions.
Segment Information | The Company operates and manages its business as a single segment for the purposes of assessing performance and making operating decisions. The Company’s chief executive officer, who is the chief operating decision maker (the “CODM”), reviews the Company’s financial information for purposes of evaluating financial performance and allocating resources (see Note 16).
Concentrations of Credit Risk | Financial instruments that potentially expose the Company to concentrations of credit risk primarily consist of cash, cash equivalents, and restricted cash. The Company maintains its cash balances at multiple accredited financial institutions in amounts that, at times, may exceed federally insured limits. However, the Company has not experienced any losses on its deposits of cash. The Company is dependent on third-party organizations to research, develop, manufacture, and process its potential product candidates for its development programs. The Company expects to continue to be dependent on a small number of manufacturers to supply it with its requirements for all products. The Company’s research and development programs could be adversely affected by a significant interruption in the supply of the necessary materials. A significant amount of the Company’s research and development activities are performed under its agreements with Paragon (see Note 11).
Fair Value Measurements | Certain assets and liabilities are carried at fair value under U.S. 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 that are 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. The carrying values of the Company’s prepaid expenses and other current assets, accounts payable, and accrued expenses and other current liabilities approximate their fair values due to their relatively short maturity periods.
Property and Equipment | Property and equipment are stated at cost less accumulated depreciation. Depreciation expense is recognized using the straight-line method over the estimated useful life of each asset as follows:
| Estimated Useful Life (Years)
Leasehold improvements | Shorter of the lease life or 10
Furniture and fixtures | 5
Classification of Convertible Preferred Shares | Prior to the reverse recapitalization, the Company had classified its Pre-Merger Crescent Series Seed Preferred Stock (the “Convertible Preferred Stock”) outside of stockholders’ equity (deficit) on the Company’s condensed consolidated balance sheet because the holders of such stock have certain liquidation rights in the event of a deemed liquidation event that, in certain situations, is not solely within the control of the Company and would require the redemption of the then-outstanding convertible preferred stock. Upon the closing of the Merger, the Company converted its Pre-Merger Crescent Series Seed Preferred Stock to Series A Preferred Shares and has classified the Series A Preferred Shares within shareholders’ equity (deficit) on its condensed consolidated balance sheet because the Series A Preferred Shares is not redeemable or puttable to the Company by the holder under any circumstances.
Convertible Notes Payable | The Company accounted for the Convertible Note (as defined in Note 7) at amortized cost. The Company considered if optional conversion features are required to be bifurcated and separately accounted for as a derivative. Costs related to the issuance of the Convertible Note were recorded as a debt discount, amortized over the term of the Convertible Note (see Note 7) and were accounted for as interest expense in other income (expense) within the condensed consolidated statement of operations and comprehensive loss using the effective interest method. At the effective time of the Merger, shares of Pre-Merger Crescent common stock and pre-funded warrants issued pursuant to the conversion of the Convertible Notes (including accrued interest) automatically converted into shares of Crescent common stock and pre-funded warrants (see Note 1).
Research and Development Contract Costs Accruals and Research and Development Costs | The Company records the costs associated with research studies and manufacturing development as incurred. These costs are a significant component of the Company’s research and development expenses, with a substantial portion of the Company’s ongoing research and development activities conducted to date by vendors, including the Company’s related party Paragon (see Note 11), contract manufacturing organizations (“CMOs”), and contract research organizations (“CROs”). The Company accrues for expenses resulting from obligations under its discovery and option agreements (the “Option Agreements”) by and among the Company, Paragon and Parascent Holding LLC (“Parascent”), and agreements with CROs, CMOs, and other vendors for which payment flows may not match the periods over which materials or services are provided to the Company. Accruals are recorded based on estimates of services received and efforts expended pursuant to agreements established with Paragon, CROs, CMOs, and other outside service providers. These estimates are typically based on contracted amounts applied to the proportion of work performed and determined through analysis with internal personnel and external service providers as to the progress or stage of completion of the services. The Company makes significant judgments and estimates in determining the accrual balance in each reporting period. In the event advance payments are made to Paragon, a CRO, CMO, or other outside service provider, the payments will be recorded as a prepaid asset which will be expensed as the contracted services are performed. Changes in these estimates that result in material changes to the Company’s accruals could materially affect the Company’s results of operations. Research and development costs are expensed as incurred. Research and development costs include salaries and bonuses, share-based compensation, employee benefits, and external costs of vendors and consultants engaged to conduct research and development activities, which include amounts reimbursed to Paragon under the Paragon Option Agreements (as defined in Note 11). Nonrefundable advance payments for goods or services to be received in the future for use in research and development activities are recorded as prepaid expenses on the accompanying condensed consolidated balance sheet. The prepaid amounts are expensed as the related goods are delivered or the services are performed, or when it is no longer expected that the goods will be delivered, or the services rendered.
Leases | At the lease commencement date, when control of the underlying asset is transferred from the lessor to the Company, the Company classifies a lease as either an operating or finance lease and recognizes a right-of-use (“ROU”) asset and a current and non-current lease liability, as applicable, in the balance sheet if the lease has a term greater than one year. Lease terms may include options to extend or terminate the lease when it is reasonably certain that the Company will exercise its option. At the lease commencement date, operating lease liabilities and their corresponding ROU assets are recorded at the present value of future minimum lease payments over the expected remaining lease term. The Company determines the present value of lease payments using the implicit rate, if readily determinable, or the incremental borrowing rate. The incremental borrowing rate is estimated based on the rate the Company would have to pay on a collateralized basis over a similar term as the lease. For operating leases, lease expense for lease payments is recognized on a straight-line basis over the lease term. For finance leases, lease expense includes amortization expense of the ROU asset recognized on a straight-line basis over the lease term and interest expense recognized on the finance lease liability. In addition, certain adjustments to the ROU asset may be required for items such as lease prepayments, incentives received, or initial direct costs. As of September 30, 2025, the Company has one operating lease and no finance leases. The Company accounts for lease and non-lease components related to operating leases as a single lease component. The Company has elected that costs associated with leases having an initial term of 12 months or less are recognized in the condensed consolidated statement of operations and comprehensive loss on a straight-line basis over the lease term and are not recorded on its condensed consolidated balance sheets. Variable lease expense is recognized as incurred and consists primarily of utilities and other office space related expenses.
General and Administrative Expenses | General and administrative expenses consist primarily of salaries and bonuses, share-based compensation, employee benefits, finance and administration costs, and professional fees.
Commitments and Contingencies | The Company may be subject to contingent liabilities, such as legal proceedings and claims, that arise in the ordinary course of business activities. The Company accrues for loss contingencies when losses become probable and are reasonably estimable. If the reasonable estimate of the loss is a range and no amount within the range is a better estimate, the minimum amount of the range is recorded as a liability on the condensed consolidated balance sheet. The Company does not accrue for contingent losses that, in its judgment, are considered to be reasonably possible, but not probable; however, it discloses the range of reasonably possible losses.
Share-Based Compensation and Early Exercise of Stock Options | The Company classifies share-based compensation expense in its condensed consolidated statement of operations and comprehensive loss 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 grants stock options, restricted stock awards (“RSAs”), and restricted stock units (“RSUs”) that are subject to service-based vesting conditions. Compensation expense for awards to employees and directors with service-based vesting conditions is recognized using the straight-line method over the requisite service period, which is generally the vesting period of the respective award. Compensation expense for awards to non-employees with service-based vesting conditions is recognized in the same manner as if the Company had paid cash in exchange for the goods or services, which is generally over the vesting period of the award. Forfeitures are accounted for as they occur. The Company has issued stock options, RSAs, and RSUs with service-based vesting conditions only. The Company measures all share-based awards granted to employees, directors, and non-employees in the form of stock options to purchase shares of its ordinary shares based on the fair value of the awards on the date of grant using the Black-Scholes option-pricing model. The Black-Scholes option-pricing model uses as inputs the fair value of the Company’s ordinary shares and certain management estimates, including the expected stock price volatility, the expected term of the award, the risk-free interest rate, and expected dividends. Expected volatility is calculated based on reported volatility data for a representative group of publicly traded companies for which historical information is available. The Company selects companies with comparable characteristics with historical share price information that approximates the expected term of the equity-based awards. The Company computes the historical volatility data using the daily closing prices for the selected companies’ shares during the equivalent period that approximates the calculated expected term of the stock options. The Company will continue to apply this method until a sufficient amount of historical information regarding the volatility of its share price becomes available. The risk-free interest rate is based on the U.S. Treasury yield curve in effect at the time of grant commensurate with the expected term assumption. For employee and non-employee awards the Company uses the simplified method, under which 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. The expected dividend yield is assumed to be zero as the Company has no current plans to pay any dividends on ordinary shares. The Company measures the fair value of RSAs and RSUs using the difference, if any, between the purchase price per share of the award and the fair value of the Company’s ordinary shares at the date of grant. The terms of the 2024 Equity Incentive Plan (the “2024 Plan”) permit option holders to exercise options before their options are vested, subject to certain limitations. The early exercised options are subject to the same vesting provisions in the original stock option awards. Shares issued as a result of early exercise that have not vested are subject to repurchase by the Company upon termination of the purchaser’s employment, at the price paid by the purchaser. While such shares are considered legally outstanding, they are not deemed to be outstanding for accounting purposes until they vest and are therefore excluded from basic and diluted net loss per share until the repurchase right lapses and the shares are no longer subject to the repurchase feature. A liability is recognized related to the cash proceeds of the unvested options and is reclassified into ordinary shares and additional paid-in capital as the shares vest and the repurchase right lapses.
Net Loss per Share Attributable to Ordinary Shareholders | Basic and diluted net loss attributable to shareholders per share is presented in conformity with the two-class method required for participating securities (ordinary shares and Series A Preferred Shares). Basic earnings per share is computed by dividing net income available to each class of shares by the weighted-average number of ordinary shares and participating securities outstanding during the period. Pre-funded warrants were included as the exercise price is negligible and these warrants are fully vested and exercisable. Series A Preferred Shares share the same characteristics as the Company’s ordinary shares and has no substantive preference attributed to them and, accordingly, has been considered a class of ordinary shares in the computation of net loss per share regardless of their legal form. Net loss is allocated to ordinary shares based on its proportional ownership on an as-converted basis. Net loss is not allocated to participating securities as they do not have an obligation to fund losses. The weighted-average number of shares outstanding of ordinary shares reflects changes in ownership over the periods presented. Diluted net loss per share is computed by dividing the net loss attributable to shareholders adjusted for income (expenses), net of tax, related to any diluted securities, by the weighted-average number of ordinary shares and potentially dilutive securities outstanding for the period. For purposes of this calculation, the Company’s outstanding stock options to purchase common stock, unvested restricted stock units, and unvested restricted stock awards are considered potentially dilutive ordinary shares. The Company generated a net loss for the periods presented. Accordingly, basic and diluted net loss per share is the same because the inclusion of the potentially dilutive securities would be anti-dilutive.
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 in the Company’s tax returns. Deferred tax assets and liabilities are determined based on the differences between the financial statement basis and tax basis of assets and liabilities using enacted tax rates in effect for the years 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 through a charge to income tax expense. The potential for recovery of deferred tax assets is evaluated by estimating the future taxable profits expected and considering prudent and feasible tax planning strategies. The Company accounts for uncertainty in income taxes recognized in the financial statements by applying a two-step process to determine the amount of tax benefit to be recognized. First, the tax position must be evaluated to determine the likelihood that it will be sustained upon external examination by the taxing authorities. If the tax position is deemed more likely than not to be sustained, the tax position is then assessed to determine the amount of benefit to recognize in the financial statements. The amount of the benefit that may be recognized is the largest amount that has a greater than 50% likelihood of being realized upon ultimate settlement. 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.
Recently Adopted Accounting Pronouncement and Recently Issued Accounting Pronouncements Not Yet Adopted | In May 2025, the FASB issued ASU 2025-03, Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity (“ASU 2025-03”), which revises current guidance for determining the accounting acquirer for a transaction effected primarily by exchanging equity interests in which the legal acquiree is a variable interest entity that meets the definition of a business. The amendments require that an entity consider the same factors that are currently required for determining which entity is the accounting acquirer in other acquisition transactions. ASU 2025-03 is effective for the Company’s annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods, with early adoption permitted. ASU 2025-03 is required to be applied prospectively. The Company early adopted this ASU on a prospective basis as of April 1, 2025. The early adoption of ASU 2025-03 did not have any impact on the accounting conclusions related to the closing of the Merger on June 13, 2025 or the Company's condensed consolidated financial statements. In December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. This ASU expands disclosures in an entity’s income tax rate reconciliation table and disclosures regarding taxes paid both in the U.S. and foreign jurisdictions. This update is effective beginning with the Company’s 2025 fiscal year annual reporting period. The Company is currently evaluating the impact of this standard on its 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 (“ASU 2024-03”). The amendments in ASU 2024-03 require public entities to disclose specified information about certain costs and expenses. ASU 2024-03 is effective for the Company’s annual reporting period beginning after December 15, 2026 and interim reporting periods beginning after December 27, 2027, with early adoption permitted. The Company is currently evaluating the impact of this standard on its financial statements.

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