Fair Value Measurements

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Fair Value Measurements

3. Fair Value Measurements

Fair value is defined as the exchange price that would be received for an asset or paid to transfer a liability, or an exit price, in the principal or most advantageous market for that asset or liability in an orderly transaction between market participants on the measurement date.

Fair value is measured based on a three-level hierarchy of inputs, of which the first two are considered observable and the last unobservable. Unobservable inputs reflect the Company’s own assumptions about current market conditions. The use of observable inputs is maximized, where available, and the use of unobservable inputs is minimized when measuring fair value. The three-level hierarchy of inputs is as follows:

Level 1—Inputs are unadjusted, quoted prices in active markets for identical assets or liabilities at the measurement date;

Level 2—Inputs are observable, unadjusted quoted prices in active markets for similar assets or liabilities, unadjusted quoted prices for identical or similar assets or liabilities 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 related assets or liabilities; and

Level 3—Unobservable inputs that are significant to the measurement of the fair value of the assets or liabilities that are supported by little or no market data.

To the extent that the valuation is based on models or inputs that are less observable or unobservable in the market, the determination of fair value requires more judgment. Accordingly, the degree of judgment exercised in determining fair value is greatest for instruments categorized in Level 3. A financial instrument’s level within the fair value hierarchy is based on the lowest level of any input that is significant to the fair value measurement.

The carrying amounts reflected in the condensed consolidated balance sheets for cash, restricted cash, accounts receivable, accounts payable and accrued liabilities approximate their fair values due to their short-term nature.

The following tables present the Company’s assets and liabilities that are measured at fair value on a recurring basis by level within the fair value hierarchy (in thousands):

	March 31, 2022
	Level 1		Level 2		Level 3		Total
Money market funds	$	53,239	$	—	$	—	$	53,239
US treasuries		67,721		—		—		67,721
Government treasury and agency securities		—		6,020		—		6,020
Corporate securities and commercial paper		—		175,822		—		175,822
Total assets measured at fair value	$	120,960	$	181,842	$	—	$	302,802

	December 31, 2021
	Level 1		Level 2		Level 3		Total
Money market funds	$	115,410	$	—	$	—	$	115,410
US treasuries		24,053		—		—		24,053
Government treasury and agency securities		—		7,600		—		7,600
Corporate securities and commercial paper		—		171,842		—		171,842
Total assets measured at fair value	$	139,463	$	179,442	$	—	$	318,905

The following table presents the changes in fair values of the Company’s convertible preferred stock warrants and common stock warrants, classified as level 3 financial liabilities (in thousands):

	Three Months Ended March 31,
	2022		2021
Beginning balance	$	—	$	314
Change in fair value		—		(8	)
Reclassification of fair value of warrants to    equity upon the net exercise of warrants		—		—
Ending balance	$	—	$	306

Prior to settlement, the fair value of the warrant liability was estimated using a hybrid approach between a probability-weighted expected return method (PWERM) and an option pricing model (OPM), which estimated the probability weighted value across multiple liquidity scenarios, while using OPM to estimate the allocation of value within one or more of those scenarios. The Company considered various scenarios, including a scenario in which the Company completes an IPO, a scenario in which the Company stays private, and a scenario contemplating a merger or acquisition.