Short-term Investments (Tables)

12 Months Ended

Dec. 31, 2020

Short-term Investments [Abstract]

Summary of Debt Securities by Major Security Type

A summary of debt securities by major security type is as follows as of December 31, 2019 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Debt Securities-available-for-sale:
U.S. agency securities	$	1,000	$	—	$	—	$	1,000
U.S. government securities		14,967		26		—		14,993
Total debt securities	$	15,967	$	26	$	—	$	15,993

Summary of Hierarchy for Assets Measured at Fair Value on a Recurring Basis

The following table presents the hierarchy for assets measured at fair value on a recurring basis (in thousands):

	Total Fair Value		Quoted Market Prices for Identical Assets (Level 1)		Other Observable Inputs (Level 2)		Unobservable Inputs (Level 3)
As of December 31, 2020
Money market funds	$	18,394	$	18,394	$	—	$	—
As of December 31, 2019
Money market funds	$	13,219	$	13,219	$	—	$	—
U.S. government securities	$	14,993	$	14,993	$	—	$	—
U.S. agency securities	$	1,000	$	—	$	1,000	$	—