Marketable securities (Tables)

6 Months Ended

Jun. 30, 2022

Marketable Securities [Abstract]

Summary of marketable securities

Marketable securities as of June 30, 2022 consisted of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities, current:
Corporate debt securities	$	210,758	$	—	$	(1,723)	$	209,035
U.S. government debt securities	20,989		—		(257)		20,732
U.S. Treasury securities	21,023		—		(306)		20,717
Marketable securities, non-current:
Corporate debt securities	56,256		—		(1,220)		55,036
U.S. government debt securities	30,988		—		(941)		30,047
U.S. Treasury securities	5,108		—		(134)		4,974
Total marketable securities, current and non-current	$	345,122	$	—	$	(4,581)	$	340,541

Marketable securities as of December 31, 2021 consisted of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities, current:
Corporate debt securities	$	219,414	$	1	$	(250)	$	219,165
U.S. Treasury securities	8,987		—		(3)		8,984
U.S. government debt securities	5,006		—		—		5,006
Marketable securities, non-current:
Corporate debt securities	89,538		—		(403)		89,135
U.S. government debt securities	32,982		—		(105)		32,877
U.S. Treasury securities	20,203		—		(15)		20,188
Total marketable securities, current	$	376,130	$	1	$	(776)	$	375,355

Summary of marketable securities in unrealized loss position

Marketable securities in unrealized loss positions as of June 30, 2022 consisted of the following (in thousands, except number of securities):

	Number of Securities	Fair Value		Gross Unrealized Losses
Marketable securities in continuous unrealized loss position for less than 12 months:
Corporate debt securities	95	$	242,455	$	(2,743)
U.S. government debt securities	10	45,908		(1,069)
U.S. Treasury securities	6	25,691		(440)
Marketable securities in continuous unrealized loss position for greater than 12 months:
Corporate debt securities	11	20,186		(200)
U.S. government debt securities	1	4,871		(129)
Total marketable securities in unrealized loss position	123	$	339,111	$	(4,581)