Marketable securities

3 Months Ended

Mar. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Marketable securities

Marketable securities

The following table summarizes the marketable securities held at March 31, 2022 and December 31, 2021 (in thousands):

Description	Amortized cost / Cost		Unrealized gains		Unrealized losses		Fair value
March 31, 2022
U.S. government agency securities and treasuries	$	117,730	$	—	$	(2,025)	$	115,705
Corporate bonds	33,802		—		(135)		33,667
Commercial paper	9,823		—		—		9,823
Equity securities	4,305		—		(3,123)		1,182
Total	$	165,660	$	—	$	(5,283)	$	160,377
December 31, 2021
U.S. government agency securities and treasuries	$	128,902	$	—	$	(509)	$	128,393
Corporate bonds	49,366		—		(59)		49,307
Commercial paper	54,065		—		—		54,065
Equity securities	4,305		—		(614)		3,691
Total	$	236,638	$	—	$	(1,182)	$	235,456

No available-for-sale debt securities held as of March 31, 2022 or December 31, 2021 had remaining maturities greater than five years.