Cash, Cash Equivalents and Marketable Securities

3 Months Ended

Mar. 31, 2021

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents and Marketable Securities

4. Cash, Cash Equivalents and Marketable Securities

A summary of cash, cash equivalents and available-for-sale marketable securities held by the Company as of March 31, 2021 and December 31, 2020 is as follows (in thousands):

	March 31, 2021
	Cost		Unrealized gains		Unrealized losses			Fair value
Cash and cash equivalents:
Cash (Level 1)	$	710	$	—	$	—		$	710
Money market funds (Level 1)		43,495		—		—			43,495
Total cash and cash equivalents		44,205		—		—			44,205
Marketable securities:
Corporate debt securities due within 1 year of date of purchase (Level 2)		243,392		18		(34	)		243,376
U.S. government and government sponsored entities due within 1 year of date of purchase (Level 2)		13,476		6		—			13,482
Corporate debt securities due within 1 to 2 years of date of purchase (Level 2)		6,165		1		(5	)		6,161
Total cash, cash equivalents and marketable securities	$	307,238	$	25	$	(39	)	$	307,224

	December 31, 2020
	Cost		Unrealized gains		Unrealized losses			Fair value
Cash and cash equivalents:
Cash (Level 1)	$	716	$	—	$	—		$	716
Money market funds (Level 1)		53,288		—		—			53,288
Total cash and cash equivalents		54,004		—		—			54,004
Marketable securities:
Corporate debt securities due within 1 year of date of purchase (Level 2)		227,172		80		(36	)		227,216
U.S. government and government sponsored entities due within 1 year of date of purchase (Level 2)		—		—		—			—
Corporate debt securities due within 1 to 2 years of date of purchase (Level 2)		2,926		4		(1	)		2,929
Total cash, cash equivalents and marketable securities	$	284,102	$	84	$	(37	)	$	284,149