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Fair Value Measurement - Debt (Details) - Senior Notes - USD ($) $ in Thousands | Sep. 30, 2020 | Aug. 31, 2020 | Dec. 31, 2019 | Apr. 30, 2019 | Apr. 30, 2018
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Carrying Amount | Fair Value, Measurements, Nonrecurring |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes | $ 1,536,984 |  | $ 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 | 2,671,158 |  | 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 | 236,809 |  |  |  |
Unamortized issuance costs | 11,842 | $ 15,900 |  |  |
0% Convertible Senior Notes Due 2026 | Carrying Amount |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes |  | 758,700 |  |  |
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 | 751,349 |  | 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 | 1,000,000 |  | 0 |  |
0.125% Convertible Senior Notes Due 2025 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Unamortized debt discount | 158,077 |  | 184,698 |  |
Unamortized issuance costs | 10,862 |  | 12,691 | $ 19,800 |
0.125% Convertible Senior Notes Due 2025 | Carrying Amount |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes |  |  |  | $ 588,000 |
0.125% 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 | 631,061 |  | 602,611 |  |
0.125% 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 | 1,208,800 |  | 831,000 |  |
0.25% Convertible Senior Notes Due 2023 |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes |  | $ 156,100 |  |  |
Unamortized debt discount | 16,484 |  | 42,280 |  |
Unamortized issuance costs | 1,960 |  | 5,028 |  | $ 9,400
0.25% Convertible Senior Notes Due 2023 | Carrying Amount |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Convertible senior notes |  |  |  |  | $ 280,800
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 | 154,574 |  | 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 | $ 462,358 |  | $ 523,538 |  |

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