Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2020

Fair Value Disclosures [Abstract]

Summary of Cash Equivalents and Marketable Securities Measured at Fair Value

As of December 31, 2020, cash equivalents and marketable securities measured at fair value were as follows (in thousands):

			Fair Value Measurements Using
As of December 31, 2020	Total		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Cash equivalents:
Negotiable certificates of deposit	$	720	$	—	$	720	$	—
Marketable securities:
Corporate debt securities		6,679		—		6,679		—
Total	$	7,399	$	—	$	7,399	$	—

Schedule of Reconciliation of Preferred Stock Warrant Liability Measured at Fair Value Using Level 3 Unobservable Inputs

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

Balance at December 31, 2017 and 2018	$	30
Change in fair value		15
Balance at December 31, 2019		45
Change in fair value		75
Reclassification of warrant liability    to stockholders’ equity		(120	)
Balance at December 31, 2020	$	—