Stockholders' Equity (Deficit), Convertible Preferred Stock and Tranche Liability (Tables)

12 Months Ended

Dec. 31, 2020

Equity [Abstract]

Reconciliation of Preferred Stock Tranche Liability Measured at Fair Value

The following table provides a reconciliation of the preferred stock tranche liability measured at fair value using Level 3 significant unobservable inputs (in thousands):

Balance at December 31, 2019	$	—
Fair value at issuance of Series A convertible preferred stock		1,050
Change in fair value		17,030
Settlement of preferred stock tranche liability due to issuance of Milestone Shares		(18,080	)
Balance at December 31, 2020	$	—