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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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