Marketable securities (Tables)

12 Months Ended

Dec. 31, 2022

Marketable Securities [Abstract]

Summary of marketable securities

Marketable securities at December 31, 2022 consisted of the following (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Marketable securities, current:
Corporate debt securities	$	183,270	$	2	$	(2,068)	$	181,204
U.S. government debt securities	40,986		—		(1,184)		39,802
U.S. Treasury securities	25,650		—		(257)		25,393
Marketable securities, non-current
Corporate debt securities	53,592		2		(471)		53,123
U.S. government debt securities	8,000		—		(161)		7,839
Total marketable securities, current and non-current	$	311,498	$	4	$	(4,141)	$	307,361

Marketable securities at 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	8,987		—		(3)		8,984
U.S. Treasury 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 and non-current	$	376,130	$	1	$	(776)	$	375,355

Summary of marketable securities in unrealized loss position

Marketable securities in unrealized loss positions as of December 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	63	$	134,027	$	(1,262)
U.S. government debt securities	6	15,748		(245)
U.S. Treasury securities	4	5,575		(11)
Marketable securities in continuous unrealized loss position for greater than 12 months:
Corporate debt securities	36	82,375		(1,277)
U.S. government debt securities	7	31,892		(1,100)
U.S. Treasury securities	4	19,817		(246)
Total marketable securities in unrealized loss position	120	$	289,434	$	(4,141)

Marketable securities in unrealized loss positions as of December 31, 2021 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	110	$	303,450	$	(653)
U.S. government debt securities	8	37,883		(108)
U.S. Treasury securities	5	24,172		(15)
Total marketable securities in unrealized loss position	123	$	365,505	$	(776)