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Cash Equivalents and Marketable Securities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) item
Cash Equivalents and Marketable Securities
Amortized Cost		$ 511,820
Gross Unrealized Gains		18
Gross Unrealized Losses		(64)
Fair Value	$ 238,183	$ 511,774
Cash Equivalents, Marketable Securities and Equity Securities
Amortized Cost	460,700
Gross Unrealized Gains	107
Fair Value	460,807
Number of securities in an unrealized loss position for more than 12 months		0
Number of noncurrent securities | item		62
Noncurrent marketable securities		$ 109,664
U.S. Treasuries
Cash Equivalents and Marketable Securities
Amortized Cost	71,348	180,376
Gross Unrealized Gains	20	8
Gross Unrealized Losses		(11)
Fair Value	71,368	180,373
Government agency securities
Cash Equivalents and Marketable Securities
Amortized Cost	155,484	107,665
Gross Unrealized Gains	87
Gross Unrealized Losses		(20)
Fair Value	155,571	107,645
Corporate equity securities
Equity securities included in other non-current assets:
Amortized Cost	3,667
Fair Value	3,667
Commercial paper
Cash Equivalents and Marketable Securities
Amortized Cost		41,912
Gross Unrealized Losses		(8)
Fair Value		41,904
Corporate notes/bonds
Cash Equivalents and Marketable Securities
Amortized Cost		42,185
Gross Unrealized Gains		10
Gross Unrealized Losses		(25)
Fair Value		42,170
Money market funds
Cash Equivalents and Marketable Securities
Amortized Cost	230,201	139,682
Fair Value	$ 230,201	$ 139,682

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