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Fair Value Measurement - Debt (Details) - Shares related to convertible senior notes - USD ($) $ in Thousands | Dec. 31, 2020 | Aug. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018
--- | --- | --- | --- | --- | ---
Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | $ 1,506,922 |  | $ 900,303 |  |
Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | 2,963,119 |  | 1,354,538 |  |
0% Convertible Senior Notes Due 2026 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unamortized debt discount | 226,732 |  |  |  |
Unamortized issuance costs | 11,338 | $ 15,900 |  |  |
0% Convertible Senior Notes Due 2026 | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | 761,930 |  | 0 |  |
0% Convertible Senior Notes Due 2026 | Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | 1,129,370 |  | 0 |  |
0.125 Percent Convertible Senior Notes Due 2025 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unamortized debt discount | 149,138 |  | 184,698 |  |
Unamortized issuance costs | 10,248 |  | 12,691 | $ 19,800 |
0.125 Percent Convertible Senior Notes Due 2025 | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | 640,614 |  | 602,611 |  |
0.125 Percent Convertible Senior Notes Due 2025 | Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | 1,456,800 |  | 831,000 |  |
0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unamortized debt discount | 9,953 |  | 42,280 |  |
Unamortized issuance costs | 1,245 |  | 5,028 |  | $ 9,400
0.25% Convertible Senior Notes Due 2023 | Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | 104,378 |  | 297,692 |  |
0.25% Convertible Senior Notes Due 2023 | Estimated Fair Value | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | $ 376,949 |  | $ 523,538 |  |

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