2. Summary of Significant Accounting Policies

Principles of Consolidation

The accompanying condensed consolidated financial statements include the accounts of the Company and its wholly owned subsidiaries. All intercompany accounts and transactions are eliminated upon consolidation.

Use of Estimates

The presentation of condensed consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates.

Research and development incentive income and receivable

The Company recognizes other income from Australian research and development incentives when there is reasonable assurance that the income will be received, the relevant expenditure has been incurred, and the consideration can be reliably measured. The research and development incentive is one of the key elements of the Australian government’s support for Australia’s innovation system and is supported by legislative law primarily in the form of the Australian Income Tax Assessment Act 1997, as long as eligibility criteria are met.

Management has assessed the Company’s research and development activities and expenditures to determine which activities and expenditures are likely to be eligible under the research and development incentive regime described above. At each period end, management estimates the refundable tax offset available to the Company based on available information at the time.

Under the program, a percentage of eligible research and development expenses incurred by the Company through its subsidiary in Australia are reimbursed. The percentage was 43.5% for the year ended December 31, 2024 and for the six months ended June 30, 2025.

The research and development incentive receivable represents an amount due in connection with the above program. The Company recorded a research and development incentive receivable of $798 and $704 as of June 30, 2025 and December 31, 2024, respectively, in the condensed consolidated balance sheets and other income from Australian research and development incentives of $253 for the three months ended June 30, 2024, and $56 and $499, respectively, for the six months ended June 30, 2025 and 2024, in the condensed consolidated statements of operations related to refundable research and development incentive program payments in Australia. The Company recorded an immaterial amount of Australian research and development incentives during the three months ended June 30, 2025.

The following table shows the change in the research and development incentive receivable from January 1, 2024 to June 30, 2025 (in thousands):

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Foreign Currency Translation

The financial statements of the Company’s Australian subsidiary are measured using the local currency as the functional currency. The assets and liabilities of this subsidiary are translated into U.S. dollars at an exchange rate as of the consolidated balance sheet date. Equity is translated at historical exchange rates. Revenues and expenses are translated into U.S. dollars at average rates of exchange in effect during the period. The resulting cumulative translation adjustments have been recorded as a separate component of stockholders’ equity. Realized and unrealized foreign currency transaction gains and losses are included in the results of operations.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to credit risk consist principally of cash and cash equivalents. All cash and cash equivalents are held in United States or Australian financial institutions and money market funds. At times, the Company may maintain cash balances in excess of the federally insured amount of $250 per depositor, per insured bank, for each account ownership category. Although the Company currently believes that the financial institutions with whom it does business will be able to fulfill their commitments to the Company, there is no assurance that those institutions will be able to continue to do so. The Company has not experienced any credit losses associated with its balances in such accounts for the year ended December 31, 2024 or for the six months ended June 30,2025.

Restructuring Charges

On June 23, 2025, the Company’s Board of Directors approved a series of measures to conserve cash and reduce operating costs, including (i) the completion of the DeFianCe clinical trial and the wind-down of the Company’s research and development activities, including the Company’s sirexatamab and FL-501 development programs, and (ii) a reduction in force that impacted approximately 75% of the Company’s workforce. The reduction in force was conducted in two phases (i) first, on June 30, 2025, that impacted the Company’s Chief Operating Officer, Chief Scientific Officer and Chief Manufacturing Officer and (ii) second, on July 31, 2025 that impacted the Chief Medical Officer of the Company. As a result of this workforce reduction, during the three months ended June 30, 2025, the Company incurred $4,527 of charges recorded within restructuring charges in the condensed consolidated statements of operations. The Company does not expect to incur any further material charges related to this workforce reduction. The charges consist primarily of one-time employee severance and benefit costs and stock-based compensation expense related to acceleration of vesting. As of June 30, 2025, $3,540 is accrued within accrued expenses for employee severance benefits, the majority of which are expected to be paid in the third and fourth quarters of 2025.

Deposits

As of June 30, 2025 and December 31, 2024, there were $784 and $823, respectively, of deposits made by the Company with certain service providers that are to be applied to future payments due under the service agreements or returned to the Company if not utilized, which were recorded in the condensed consolidated balance sheets.

Warrants

The Company will recognize on a prospective basis the value of the effect of the down round feature in the warrants to purchase shares of common stock that were issued in a private placement in November 2017 (the “2017 Warrants”) and in the warrants that were issued in a private placement in March 2020 (the “March 2020 Coverage Warrants”) when it is triggered (i.e., when the exercise price is adjusted downward). This value is measured as the difference between (1) the financial instrument’s fair value (without the down round feature) using the pre-trigger exercise price and (2) the financial instrument’s fair value (with the down round feature) using the reduced exercise price. The value of the effect of the down round feature will be treated as a dividend and a reduction to income available to common stockholders in the basic earnings per share (“EPS”) calculation. In connection with the private placement of common stock and prefunded warrants completed in April 2024 (the “April 2024 Private Placement”), when the 2017 Warrants were repriced from $10.55 to $2.82 as a result of a down round, the Company recorded a dividend of $234 during the three months ended June 30, 2024. The 2017 Warrants expired in November 2024.

Fair Value of Financial Instruments

Certain assets and liabilities are carried at fair value under 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:

A summary of the assets carried at fair value in accordance with the hierarchy defined above is as follows (in thousands):

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Cash equivalents of $5,151 and $23,299 as of June 30, 2025 and December 31, 2024, respectively, consisted of overnight investments and money market funds which are classified within Level 1 of the fair value hierarchy because they are valued using quoted market prices in active markets.

The carrying values of the research and development incentive receivable, accounts payable and accrued liabilities approximate their fair value due to the short-term nature of these assets and liabilities.

Leases

The Company accounts for leases in accordance with Accounting Standards Codification, or ASC, Topic 842, Leases.

At the inception of an arrangement, the Company determines whether the arrangement is or contains a lease based on the unique facts and circumstances present. Most leases with a term greater than one year are recognized on the balance sheet as right-of-use assets, lease liabilities and, if applicable, long-term lease liabilities. The Company has elected not to recognize on the balance sheet leases with terms of one year or less. Operating lease liabilities and their corresponding right-of-use assets are recorded based on the present value of lease payments over the expected remaining lease term. The Company has determined that the rate implicit in the lease is not determinable and the Company does not have borrowings with similar terms and collateral. Therefore, the Company considered a variety of factors, including observable debt yields from comparable companies and the volatility in the debt market for securities with similar terms, in determining that 8% was reasonable to use as the incremental borrowing rate for purposes of the calculation of lease liabilities.

In accordance with the guidance in Topic 842, components of a lease should be split into three categories: lease components (e.g., land, building, etc.), non-lease components (e.g., common area maintenance, maintenance, consumables, etc.), and non-components (e.g., property taxes, insurance, etc.). Then the fixed and in-substance fixed contract consideration (including any related to non-components) must be allocated based on fair values to the lease components and non-lease components.

Although separation of lease and non-lease components is required, certain practical expedients are available. Entities may elect the practical expedient to not separate lease and non-lease components. Rather, they would account for each lease component and the related non-lease component together as a single component. The Company has elected to account for the lease and non-lease components of each of its operating leases as a single lease component and allocate all of the contract consideration to the lease component only. The lease component results in an operating right-of-use asset being recorded on the consolidated balance sheets and amortized such that lease expense is recorded on a straight line basis over the term of the lease.

Segment Information

The Company’s chief operating decision maker (“CODM”), the Chief Executive Officer, manages the Company’s business activities as a single operating and reportable segment at the consolidated level. Accordingly, the Company’s CODM uses consolidated net loss to measure segment loss, allocate resources and assess performance. Further, the CODM reviews and utilizes functional expenses (research and development and general and administrative) at the consolidated level to manage the Company’s operations. Other segment items included in consolidated net loss are interest income and foreign currency gain (loss), which are reflected in the consolidated statements of operations and comprehensive loss.

Income taxes

On July 4, 2025, the One Big Beautiful Bill Act (“OBBBA”) was signed into law, introducing significant changes to the U.S. federal income tax code. The OBBA includes provisions affecting corporate tax incentives, international tax provisions, and various business credits and deductions. Pursuant to ASC 740, Income Taxes, the Company will recognize the effects of the OBBBA in the third fiscal quarter of 2025, the period in which the legislation was enacted. The Company is currently evaluating the potential impact of the OBBBA on its financial statements.

Net Loss per Share

Basic net loss per share is computed using the weighted average number of common shares outstanding during the period. Diluted net loss per share is computed using the weighted average number of common shares outstanding during the period and, if dilutive, the weighted average number of potential shares of common stock, including the assumed exercise of stock options and warrants.

Subsequent Events

The Company considers events or transactions that occur after the balance sheet date but prior to the issuance of the financial statements to provide additional evidence for certain estimates or to identify matters that require additional disclosure. Subsequent events have been evaluated as required.

Recently issued accounting pronouncements

From time to time, new accounting pronouncements are issued by the Financial Accounting Standards Board (“FASB”) or other standard setting bodies that the Company adopts as of the specified effective date.

December 2023, the FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures. The guidance in ASU 2023-09 improves the transparency of income tax disclosures by greater disaggregation of information in the rate reconciliation and income taxes paid disaggregated by jurisdiction. The standard is effective for public companies for fiscal years beginning after December 15, 2024, with early adoption permitted. The Company adopted ASU 2023-09 effective January 1, 2025 and it did not have a material impact on the Company’s consolidated financial statements at adoption date.