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Cash Equivalents and Marketable Securities (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2022 USD ($) security item	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Cash Equivalents and Marketable Securities
Amortized Cost	$ 482,752		$ 620,409
Gross Unrealized Gains	11		2
Gross Unrealized Losses	(4,302)		(495)
Fair Value	$ 478,461		619,916
Number of securities in an unrealized loss position for more than 12 months | item	3
Number of noncurrent securities | security	25
Noncurrent marketable securities	$ 58,844		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	$ 210,705		203,519
Fair Value	210,705		203,519
Government agency securities.
Cash Equivalents and Marketable Securities
Amortized Cost	126,455		126,927
Gross Unrealized Gains	2
Gross Unrealized Losses	(2,911)		(228)
Fair Value	123,546		126,699
U.S. Treasuries
Cash Equivalents and Marketable Securities
Amortized Cost	68,568		124,016
Gross Unrealized Gains	9		1
Gross Unrealized Losses	(425)		(84)
Fair Value	68,152		123,933
Commercial paper
Cash Equivalents and Marketable Securities
Amortized Cost	42,134		89,699
Gross Unrealized Gains			1
Gross Unrealized Losses	(100)		(13)
Fair Value	42,034		89,687
Corporate notes/bonds
Cash Equivalents and Marketable Securities
Amortized Cost	34,890		76,248
Gross Unrealized Losses	(866)		(170)
Fair Value	$ 34,024		$ 76,078

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