Fair Value Measurements

6 Months Ended

Jun. 30, 2024

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair Value Measurements

Financial assets and liabilities are recorded at fair value. The carrying amount of certain financial instruments, including cash equivalents, other current assets, accounts payable and accrued liabilities, approximate fair value due to their relatively short maturities. Assets and liabilities recorded at fair value on a recurring basis in the condensed consolidated balance sheets are categorized based upon the level of judgment associated with the inputs used to measure their fair values. Fair value is defined as the exchange price that would be received for an asset or an exit price that would be paid to transfer a liability in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. The authoritative guidance on fair value measurements establishes a three-tier fair value hierarchy for disclosure of fair value measurements as follows:

Level 1: Quoted prices in active markets for identical assets or liabilities.

Level 2: Observable inputs other than Level 1 prices, 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 are classified in their entirety based on the lowest level of input that is significant to the fair value measurement. The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires management to make judgments and consider factors specific to the asset or liability.

The Company applies fair value accounting for all financial assets and liabilities and nonfinancial assets and liabilities that are required to be recognized or disclosed at fair value in the financial statements. The Company determines the fair value of Level 1 assets using quoted prices in active markets for identical assets. The Company reviews trading activity and pricing for Level 2 investments as of each measurement date. Level 2 inputs, which are obtained from various third-party data providers, represent quoted prices for similar assets in active markets and were derived from observable market data, or, if not directly observable, were derived from or corroborated by other observable market data.

In certain cases, where there is limited activity or less transparency around inputs to valuation, securities are classified as Level 3 within the valuation hierarchy. The Company did not have any financial assets or liabilities measured using Level 3 inputs as of June 30, 2024 or December 31, 2023.

The following table summarizes the Company’s financial assets measured at fair value on a recurring basis and classified under the appropriate level of the fair value hierarchy as described above (in thousands):

	June 30, 2024
	Total		Level 1		Level 2		Level 3
Financial Assets:
Cash equivalents:
U.S. Treasury money market funds	$	28,158	$	28,158	$	—	$	—
Marketable securities:
Certificate of deposit		533		—		533		—
U.S. Treasury securities		51,889		51,889		—		—
Commercial paper		65,494		—		65,494		—
Corporate debt securities		10,990		—		10,990		—
U.S. government agency bonds		7,000		—		7,000		—
Total	$	164,064	$	80,047	$	84,017	$	—

	December 31, 2023
	Total		Level 1		Level 2		Level 3
Financial Assets:
Cash equivalents:
U.S. Treasury money market funds	$	35,349	$	35,349	$	—	$	—
Marketable securities:
Certificate of deposit		544		—		544		—
U.S. Treasury securities		54,175		54,175		—		—
Commercial paper		65,070		—		65,070		—
U.S. government agency bonds		46,090		—		46,090		—
Total	$	201,228	$	89,524	$	111,704	$	—

Nonrecurring Fair Value Measurements

The right-of-use (“ROU”) asset associated with Suite 400 of the Company's headquarters in South San Francisco, California, is a separate asset group measured at fair value on a nonrecurring basis as of December 31, 2023 due to an impairment recognized on the ROU asset at that date (see Note 6). The fair value of this asset group calculated as the present value of the estimated future cash flows of sublease income attributable to the ROU asset associated with Suite 400, was classified in Level 3 of the fair value hierarchy. When calculating the present value of the estimated future cash flows, sublease income was estimated to increase at a rate of 3.5% per year, and the cash flows were discounted using a rate of 13.3%. In June 2024, the Company recognized an additional $1.5 million

impairment charge in relation to Suite 400 to write off the net book value of the ROU asset as of June 30, 2024 as the estimated future cash flow from sublease income is zero due to current market conditions.