Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Marketable securities as of March 31, 2022 consisted of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Marketable securities, current:
Corporate debt securities	$	220,349	$	—	$	(1,040	)	$	219,309
U.S. Treasury securities		16,043		—		(146	)		15,897
U.S. government debt securities		10,000		—		(36	)		9,964
Marketable securities, non-current:
Corporate debt securities		80,816		—		(1,387	)		79,429
U.S. government debt securities		41,970		—		(876	)		41,094
U.S. Treasury securities		10,120		—		(165	)		9,955
Total marketable securities, current and non-current	$	379,298	$	—	$	(3,650	)	$	375,648

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. government debt securities		5,006		—		—			5,006
U.S. Treasury securities		8,987		—		(3	)		8,984
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

Marketable securities in unrealized loss positions as of March 31, 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		99	$	269,361	$	(2,322	)
U.S. government debt securities		11		51,058		(912	)
U.S. Treasury securities		6		25,852		(311	)
Marketable securities in continuous unrealized loss position for greater than 12 months:
Corporate debt securities		15		26,881		(105	)
Total marketable securities in unrealized loss position		131	$	373,152	$	(3,650	)