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Financial Instruments - Cash Equivalents, Restricted Cash and Investments, Classified as Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 537,235 | $ 535,042
Unrealized Gains | 2,330 | 1,595
Unrealized Losses | (277) | (8)
Cash equivalents | 122,141 | 122,900
Short-term investments | 357,026 | 355,407
Long-term investments | 60,121 | 58,322
Total cash equivalents and investments | 539,288 | 536,629
Money market funds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 113,143 | 122,900
Unrealized Gains | 0 | 0
Unrealized Losses | 0 | 0
Fair Value | 113,143 | 122,900
Commercial paper |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 25,786 | 204,144
Unrealized Gains | 0 | 871
Unrealized Losses | 0 | (4)
Fair Value | 25,786 | 205,011
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 190,625 | 181,340
Unrealized Gains | 505 | 557
Unrealized Losses | (276) | (3)
Fair Value | 190,854 | 181,894
U.S. treasury securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 178,695 | 25,658
Unrealized Gains | 1,618 | 167
Unrealized Losses | 0 | (1)
Fair Value | 180,313 | 25,824
U.S. agency securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 28,986 |
Unrealized Gains | 207 |
Unrealized Losses | (1) |
Fair Value | $ 29,192 |
Certificates of deposit |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost |  | 1,000
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Fair Value |  | $ 1,000

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