Cash and Investments in Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2022

Fair Value Disclosures [Abstract]

Schedule of Cash and Investments in Marketable Securities, Including Cash Equivalents

Cash and investments in marketable securities, including cash equivalents, are as follows (in thousands):

	Estimated Fair Value at
	March 31, 2022		December 31, 2021
Cash and cash equivalents	$	67,993	$	25,218
Short-term investments	599,032		708,737
Long-term investments	37,363		64,828
Total cash and investments in marketable securities	$	704,388	$	798,783

Schedule of Portfolio of Cash and Investments in Marketable Securities

Our portfolio of cash and investments in marketable securities includes (in thousands):

	Fair Value Hierarchy Level	March 31, 2022								December 31, 2021
		Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Fair Value
Corporate notes and bonds	2	$	196,643	$	4	$	(1,270)	$	195,377	$	278,121
Corporate commercial paper	2	439,280		—		(1,479)		437,801		478,629
Obligations of U.S. government agencies	2	4,880		—		(9)		4,871		5,875
Available-for-sale investments		$	640,803	$	4	$	(2,758)	$	638,049	$	762,625
Money market funds	1							43,523		23,968
Certificates of deposit	2							10,894		10,940
Cash	N/A							11,922		1,250
Total cash and investments in marketable securities								$	704,388	$	798,783