The Company determined fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between unaffiliated market participants at the measurement date.

Accounting Standards Codification (ASC), Fair Value Measurement (ASC 820), established a fair value hierarchy that prioritizes the inputs used to measure fair value. Assets and liabilities measured at fair value were categorized based on whether the inputs are observable in the market and the degree that the inputs are observable. The hierarchy gives the highest priority to active markets for identical assets and liabilities (Level 1 measurement) and the lowest priority to unobservable inputs (Level 3 measurement). The categorization of financial instruments within the valuation hierarchy was based on the lowest level of input that is significant to the fair value measurement. At the end of the reporting period, the Company reviews U.S. treasury instruments held to determine whether the securities are of the most recent issuance of that security with the same maturity (referred to as “on-the-run”, which is the most liquid version of the maturity band). If a U.S. treasury instrument held at the end of the reporting period was from the most recent issuance it is classified as level 1, otherwise it is referred to as “off-the-run” and is classified as level 2. The three levels of the fair value hierarchy were as follows:

Level 1 - Observable inputs such as quoted prices in active markets for identical assets or liabilities;

Level 2 - Inputs other than quoted prices that were observable for the asset or liability, either directly or indirectly. These include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that were not active and inputs other than quoted prices that were observable for the asset or liability; and

Level 3 - Unobservable inputs that reflect management’s assumptions. 

For disclosure purposes, assets and liabilities were classified in their entirety in the fair value hierarchy level based on the lowest level of input that was significant to the overall fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement requires judgment and may have affected the placement within the fair value hierarchy levels.

At period-end, the Company evaluates U.S. Treasury instruments held to determine whether they are:

Although U.S. Treasury instruments held as cash equivalents have short maturities (typically 30–90 days) and cost closely approximates fair value, fair value disclosures are presented in accordance with ASC 820 and ASC 320 guidance.

The Company’s financial instruments consisted principally of cash and cash equivalents, accounts payable and accrued liabilities. The carrying amounts of cash, accounts payable and accrued liabilities are considered to be Level 1 measurements, because of the short-term nature of those instruments. Cash equivalents are primarily composed of U.S. Treasury instruments having maturity dates of 30 to 90 days. The Company purchased $66.9 million of U.S. Treasury instruments during the six months ended June 30, 2025.

The following table summarized the valuation of the Company’s financial instruments that fell within the fair value hierarchy (rounded in millions) at June 30, 2025:

The following table summarized the valuation of the Company’s financial instruments that fell within the fair value hierarchy (rounded in millions) at December 31, 2024:

Accounting Standards Update (ASU) No. 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures, was issued by the Financial Accounting Standards Board (FASB) in December 2023. This guidance enhances income tax disclosure requirements by mandating the disclosure of (1) specific categories in the rate reconciliation, (2) income or loss from continuing operations before income taxes, disaggregated between domestic and foreign, and (3) income tax expense or benefit from continuing operations, disaggregated by federal, state, and foreign. The ASU also requires disclosure of income tax payments to federal, state, local, and foreign jurisdictions, among other changes. The standard is effective for annual periods beginning after December 15, 2024, and will be adopted by the Company as permitted. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements and related disclosures.

In November 2024, the FASB issued ASU No. 2024-03, Income Statement - Reporting Comprehensive Income - Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses (ASU 2024-03), which requires disclosure of certain costs and expenses on an interim and annual basis in the notes to the consolidated financial statements. The guidance is effective for annual reporting periods beginning after December 15, 2026 and interim periods within annual reporting periods beginning after December 15, 2027. Early adoption is permitted. The Company is currently evaluating the impact of the adoption of this guidance on its consolidated financial statements and related disclosures.

The Company has evaluated other recently issued, but not yet effective, accounting standards that have been issued or proposed by the FASB or other standards-setting bodies through the filing date of these unaudited condensed consolidated financial statements and does not believe the future adoption of any such standards will have a material impact on the consolidated financial statements and related disclosures.