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Redeemable Convertible Preferred Stock Warrant Liability (Tables)
12 Months Ended
Dec. 31, 2021
Equity [Abstract]  
Schedule of Stockholders' Equity Note, Warrants or Rights
The following table sets forth a summary of the changes in the estimated fair value of the Company’s redeemable convertible preferred stock warrants, which represents financial instruments with valuations classified as Level 3. When a determination is made to classify a financial instrument within Level 3, the determination is based upon the significance of the unobservable inputs to the overall fair value measurement. However, Level 3 financial instruments typically include, in addition to the unobservable inputs, observable inputs (that is, components that are actively quoted and can be validated to external sources). Accordingly, the gain or loss in the table below includes changes in fair value due in part to observable factors that are part of the Level 3 methodology recognized in the statement of operations as a component of interest and other income or expense as appropriate (in thousands):
Year Ended December 31,
20212020
Beginning of the period$177 $870 
Exercised(113)(508)
Cancelled(16)— 
Change in fair value(48)(185)
End of the period$— $177 
Warrants to purchase shares of redeemable convertible preferred stock outstanding and exercisable are as follows (in thousands, except per share data):
DatesExercise
Price
Shares Outstanding at
December 31,
Initial
Value
Fair Value at
December 31,
IssuanceExpirationSeries2021202020212020
June 2017June 2022E13.73 — 72 763 $— $177