Marketable Securities

3 Months Ended

Mar. 31, 2022

Investments Debt And Equity Securities [Abstract]

Marketable Securities

3. Marketable Securities

Marketable securities by security type consisted of the following (in thousands):

	March 31, 2022
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities (due within one year)	$	51,212	$	—	$	(102	)	$	51,110
U.S. government agency bonds (due within one year)		3,001		—		(7	)		2,994
	$	54,213	$	—	$	(109	)	$	54,104

	December 31, 2021
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
U.S. Treasury securities (due within one year)	$	63,907	$	—	$	(33	)	$	63,874
U.S. government agency bonds (due within one year)		3,001		—		(3	)		2,998
	$	66,908	$	—	$	(36	)	$	66,872