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Cash Equivalents and Marketable Securities (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2022 USD ($) security item	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($)
Cash Equivalents and Marketable Securities
Amortized Cost	$ 568,917		$ 620,409
Gross Unrealized Gains	12		2
Gross Unrealized Losses	(2,521)		(495)
Fair Value	$ 566,408		619,916
Number of securities in an unrealized loss position for more than 12 months | item	0
Number of noncurrent securities | security	38
Noncurrent marketable securities	$ 78,046		120,071
Realized gains (losses) on available-for-sale securities	$ 0	$ 0
Minimum
Cash Equivalents and Marketable Securities
Remaining maturity term	1 year
Maximum
Cash Equivalents and Marketable Securities
Remaining maturity term	2 years
Money market funds
Cash Equivalents and Marketable Securities
Amortized Cost	$ 210,881		203,519
Fair Value	210,881		203,519
U.S. Treasuries
Cash Equivalents and Marketable Securities
Amortized Cost	91,947		124,016
Gross Unrealized Gains	12		1
Gross Unrealized Losses	(287)		(84)
Fair Value	91,672		123,933
Government agency securities.
Cash Equivalents and Marketable Securities
Amortized Cost	134,433		126,927
Gross Unrealized Losses	(1,529)		(228)
Fair Value	132,904		126,699
Commercial paper
Cash Equivalents and Marketable Securities
Amortized Cost	63,179		89,699
Gross Unrealized Gains			1
Gross Unrealized Losses	(37)		(13)
Fair Value	63,142		89,687
Corporate notes/bonds
Cash Equivalents and Marketable Securities
Amortized Cost	68,477		76,248
Gross Unrealized Losses	(668)		(170)
Fair Value	$ 67,809		$ 76,078

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Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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