Fair Value of Financial Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2021

Fair Value of Financial Assets and Liabilities

Schedule of financial assets and liabilities measured at fair value on a recurring basis

	Fair Value Measurements
	as of December 31, 2021 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents — money market funds	$	94,324	$	—	$	—	$	94,324
Short-term investments — U.S. Treasury notes		—		59,731		—		59,731
	$	94,324	$	59,731	$	—	$	154,055

	Fair Value Measurements
	as of December 31, 2020 Using:
	Level 1		Level 2		Level 3		Total
Assets:
Restricted cash — money market funds	$	210	$	—	$	—	$	210
Cash equivalents — money market funds		22,942		—		—		22,942
Cash equivalents — U.S. Treasury notes		—		72,695		—		72,695
Short-term investments — U.S. Treasury notes		—		209,444		—		209,444
	$	23,152	$	282,139	$	—	$	305,291

Schedule of short-term investments

			Gross		Gross
	Amortized		Unrealized		Unrealized		Credit		Fair
	Cost		Gains		Losses		Losses		Value
December 31, 2021
Short-term investments — U.S. Treasury notes	$	59,745	$	1	$	(15)	$	—	$	59,731
	$	59,745	$	1	$	(15)	$	—	$	59,731

			Gross		Gross
	Amortized		Unrealized		Unrealized		Credit		Fair
	Cost		Gains		Losses		Losses		Value
December 31, 2020
Cash equivalents — U.S. Treasury notes	$	72,694	$	1	$	—	$	—	$	72,695
Short-term investments — U.S. Treasury notes		209,459		4		(19)		—		209,444
	$	282,153	$	5	$	(19)	$	—	$	282,139