Basis of Presentation and Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2025

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying financial statements have been prepared in accordance with accounting principles generally accepted in the United States (GAAP). The accompanying financial statements include all known adjustments necessary for a fair presentation of the results as required by GAAP. These adjustments consist primarily of normal recurring accruals and estimates that impact the carrying value of assets and liabilities. Operating results for the year ended December 31, 2025, are not necessarily indicative of future results.

Use of Estimates

Use of Estimates

The preparation of the Company’s financial statements in conformity with GAAP requires management to make estimates and assumptions that impact the reported amounts of assets, liabilities, expenses, and the disclosure of contingent assets and liabilities in the Company’s financial statements and accompanying notes. These estimates and assumptions are based on current facts, historical experience and various other factors believed to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of assets and liabilities and the recording of expenses that are not readily apparent from other sources. Actual results may differ materially from these estimates.

Segment Reporting

Segment Reporting

The Company’s chief operating decision maker (CODM) is the Company’s Chief Executive Officer. The CODM is assisted in their responsibilities of making decisions regarding resource allocation and performance assessment by the leadership team, consisting of executives, an executive vice president, a senior vice president and a vice president.

The Company views its operations and manages its business as one operating segment, focused on the discovery and development of innovative therapies designed to counter the resistance mechanisms in cancer. Segment profit or loss is measured as the Company’s net loss as reported on the Company’s Statement of Operations and Comprehensive Loss. The Company monitors its cash and cash equivalents, short-term investments and long-term investments as reported on the Company’s Balance Sheets to determine funding for its research and development.

As the Company does not currently generate revenue, the CODM assesses Company performance through the achievement of pre-clinical and clinical research goals. In addition to the Company’s Statement of Operations and Comprehensive Loss, the CODM is regularly provided with budgeted and forecasted expense information which is used to determine the Company’s liquidity needs and cash allocation.

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments, which potentially subject the Company to concentration of credit risk, consist primarily of cash, cash equivalents and investments. The Company maintains deposits in federally insured financial institutions in excess of federally insured limits. The Company is exposed to credit risk in the event of default by the financial institutions holding its cash, cash equivalents and investments that are recorded on its balance sheets. The Company mitigates its risk by investing in high-grade instruments and limiting the concentration in any one issuer, which limits its exposure.

Cash, Cash Equivalents and Restricted Cash

Cash, Cash Equivalents and Restricted Cash

The Company considers all highly liquid investments with maturities of 90 days or less at the time of purchase that are readily convertible into cash as cash equivalents. These investments may include money market funds, securities issued by U.S. Government agencies, corporate debt securities and commercial paper.

Cash that is restricted and not available for general operations is considered restricted cash. The Company's restricted cash is in connection to a property lease and restrictions will be removed at the respective lease expiration.

The following table provides a reconciliation of cash, cash equivalents and restricted cash reported in the balance sheet to the total of the amount presented in the statement of cash flows, in thousands:

	December 31,
	2025		2024
Cash and cash equivalents	$	45,669	$	59,406
Restricted cash included in other assets		491		491
Total cash, cash equivalents and restricted cash	$	46,160	$	59,897

Investments

Investments

All investments have been classified as “available-for-sale” and are carried at fair value as determined based upon quoted market prices or pricing models for similar securities at period end. Investments with contractual maturities less than 12 months at the balance sheet date are considered short-term investments. Those investments with contractual maturities 12 months or greater at the balance sheet date are considered long-term investments. Dividend and interest income are recognized when earned. Realized gains and losses are included in earnings and are derived using the specific identification method for determining the cost of securities sold. Unrealized gains and losses are reported as a component of accumulated other comprehensive income (loss). The Company reviews its portfolio of available-for-sale debt securities, using both quantitative and qualitative factors, to determine if declines in fair value below cost have resulted from a credit-related loss or other factors. If the decline in fair value is due to credit-related factors, a loss is recognized in statements of operations, whereas if the decline in fair value is not due to credit-related factors, the loss is recorded in other comprehensive income (loss).

Property and Equipment

Property and Equipment

Property and equipment, which consist of lab equipment, leasehold improvements, computer hardware and software, and furniture and fixtures, are stated at historical cost less accumulated depreciation. Depreciation is recognized on a straight-line basis over the estimated useful lives of the related assets, which are generally three to seven years. Leasehold improvements are amortized using the straight-line method over the shorter of the lease term or the estimate useful life of the asset.

Impairment of Property and Equipment

Impairment of Property and Equipment

The Company accounts for the impairment of long-lived assets by reviewing these assets for impairment whenever events or changes in circumstances indicate that the carrying amount of an asset may not be recoverable. If circumstances require a long-lived asset or asset group to be tested for possible impairment, the Company first compares undiscounted cash flows expected to be generated by that asset or asset group to its carrying value. If the carrying value of the long-lived asset or asset group is not recoverable on an undiscounted-cash-flow basis, an impairment is recognized to the extent that the carrying value exceeds its fair value. The Company did not recognize impairment losses for the years ended December 31, 2025 and 2024.

Leases

Leases

The Company determines if an arrangement is or contains a lease at inception. For leases with a term greater than one year, lease right-of-use assets and lease liabilities are recognized at the lease commencement date based on the present value of lease payments over the lease term. In determining the net present value of lease payments, the Company uses its incremental borrowing rate which represents an estimated rate of interest that the Company would have to pay to borrow equivalent funds on a collateralized basis at the lease commencement date. Leases are classified as finance or operating, with classification affecting the pattern and classification of expense recognition in the statement of operations.

Research and Development Expenses and Accrued Research and Development Expenses

Research and Development Expenses and Accrued Research and Development Expenses

The Company is required to estimate its expenses resulting from its obligations under contracts with vendors, consultants, contract research organizations (CRO), and contract manufacturing organizations (CMO) in connection with conducting research and development activities. The financial terms of these contracts vary from contract to contract and may result in payment flows that do not match the periods over which materials or services are provided under such contracts.

Research and development costs are expensed in the period in which they are incurred. External costs consist primarily of payments to outside consultants, third-party CROs, CMOs, clinical trial sites and central laboratories in connection with the Company’s discovery and preclinical activities, process development, clinical manufacturing and clinical development activities. External expenses are recognized based on an evaluation of the progress to completion of specific tasks using information provided to the Company by its service providers or its estimate of the level of service that has been performed at each reporting date. The Company tracks external costs by program, clinical or preclinical. Internal costs consist primarily of employee-related costs,

laboratory supplies, facilities, depreciation and costs related to compliance with regulatory requirements. The Company does not track internal costs by program because these costs are deployed across multiple programs and, as such, are not separately classified.

The Company makes estimates of accrued expenses as of each balance sheet date based on facts and circumstances known at that time. The Company periodically confirms the accuracy of its estimates with the service providers and makes adjustments if necessary. The significant estimates in its accrued research and development expenses include the costs incurred for services performed by vendors in connection with research and development activities for which the Company has not yet been invoiced.

Income Taxes

Income Taxes

The Company accounts for income taxes under 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 included in the financial statements. Under this method, deferred tax assets and liabilities are determined on the basis of the differences between the 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. The effect of a change in tax rates on deferred tax assets and liabilities is recognized in income in the period that includes the enactment date.

The Company recognizes deferred tax assets to the extent that the Company believes these assets are more likely than not to be realized. In making such a determination, management considers all available positive and negative evidence, including future reversals of existing taxable temporary differences, projected future taxable income, tax-planning strategies and results of recent operations. If management determines that the Company would be able to realize its deferred tax assets in the future in excess of their recorded amount, management would make an adjustment to the deferred tax asset valuation allowance, which would reduce the provision for income taxes.

As of December 31, 2025 and 2024, the Company maintained valuation allowances against its deferred tax assets as the Company concluded it had not met the “more likely than not” to be realized threshold. Changes in the valuation allowance when they are recognized in the provision for income taxes would result in a change in the effective tax rate.

Stock-Based Compensation

Stock-Based Compensation

Stock-based compensation expense represents the grant date fair value of employee, officer, director and non-employee stock option and restricted stock unit grants, estimated in accordance with the applicable accounting guidance and recognized over the vesting period, which approximates the requisite service period of the awards. The Company recognizes forfeitures as they occur.

The fair value of stock options is estimated using a Black-Scholes Merton valuation model on the date of grant. This method requires certain assumptions be used as inputs, such as a risk-free interest rate, expected volatility of the Company’s common stock and expected term of the option before exercise. The risk-free interest rate is based on U.S. Treasury instruments with maturities similar to the expected term. The expected volatility is computed using historical volatility for a period equal to the expected term. Given the limited period of time the Company's stock has been traded, expected volatility is based on the Company's historical volatility and the historical volatility of a group of similar companies that are publicly traded for any stock options with an expected term that is longer than the Company's publicly traded history. The expected term represents the length of time the stock options are expected to be outstanding. Because the Company does not have sufficient exercise behavior, it determines the expected term assumption using the simplified method, which is an average of the contractual term of the option and its vesting period. Options granted have a maximum contractual term of ten years.

The fair value of restricted stock units is equal to the closing price of the Company's stock on the date of grant. Restricted stock units generally vest over a three-year period.

License Fees

License Fees

Acquisitions of technology licenses are charged to acquired in-process research and development expense or capitalized based upon the asset achieving technological feasibility in accordance with management’s assessment regarding the ultimate recoverability of the amounts paid and the potential for alternative future use.

Deferred Offering Costs

Deferred Offering Costs

The Company capitalizes costs that are directly associated with equity financings until such financings are consummated at which time such costs are recorded against the gross proceeds of the offering. Should an in-process equity financing be abandoned, the deferred offering costs will be expensed immediately as a charge to operating expenses in the statements of operations and comprehensive loss.

Other Comprehensive Gain (Loss)

Other Comprehensive Gain (Loss)

Other comprehensive gain (loss) is defined as the change in equity during a period from transactions and other events and circumstances from non-owner sources, including unrealized gains and losses on investments and foreign currency gains and losses. The unrealized gains (losses) on available for sale investments represent the only component of other comprehensive loss that is excluded from the reported net loss.

Net Loss Per Share

Net Loss Per Share

Basic net loss per common share is calculated by dividing the net loss by the weighted-average number of common shares outstanding, including pre-funded warrants issued, during the period, without consideration of potentially dilutive securities. Diluted net loss per share is computed by dividing the net loss by the weighted-average number of common shares, including pre-funded warrants issued, and potentially dilutive securities outstanding for the period. As the Company has reported a net loss for all periods presented, diluted net loss per common share is the same as basic net loss per common share for those periods.

The following table sets forth the computation of the basic and diluted net loss per share (in thousands, except share and per share amounts).

	Years Ended December 31,
	2025			2024
Numerator
Net loss	$	(129,468	)	$	(127,847	)
Denominator
Weighted average shares outstanding used in computing    net loss per share, basic and diluted		87,793,801			69,727,940
Net loss per share, basic and diluted	$	(1.47	)	$	(1.83	)

The following outstanding shares of potentially dilutive securities were excluded from the computation of diluted net loss per share attributable to common stockholders for the periods presented because including them would have been anti-dilutive:

	December 31,
	2025		2024
Options to purchase common stock		13,902,239		11,249,452
Non-vested restricted stock units		582,533		462,507
Total		14,484,772		11,711,959

Recently Adopted Accounting Pronouncements

Recently Adopted Accounting Pronouncements

In December 2023, the FASB issued Accounting Standards Update (ASU) 2023-09, Improvements to Income Tax Disclosures, which does not change accounting for income taxes but requires new disclosures focusing on the effective rate reconciliation and taxes paid. The Company adopted the standard and applied the disclosure requirements on a prospective basis for the year ended December 31, 2025. Adoption of this ASU did not have a material impact on the financial statements and related disclosures.

New Accounting Pronouncements Not Yet Adopted

Recently Issued Accounting Pronouncements

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 is intended to enhance expense disclosures by requiring additional information about specific expense categories in the notes to the financial statements. The standard is effective, as clarified by ASU 2025-01, for annual periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027, with early adoption permitted. The standard may be adopted prospectively or retrospectively. The Company is currently evaluating the impact of the standard on its financial statements and related disclosures.