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Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($) | Sep. 30, 2020 | Dec. 31, 2019 | May 31, 2018
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Notes Payable, Current and Noncurrent [Abstract] |  |  |
Principal amount of the 2023 Notes outstanding | $ 515,560,000 | $ 750,000,000 | $ 750,000,000.0
Unamortized discount (including unamortized debt issuance cost) | (60,587,000) | (111,041,000) |
Total long-term portion of notes payable | 454,973,000 | 638,959,000 |
Carrying value of equity component of the 2023 Notes | 55,339,000 | 101,422,000 |
Fair value of the 2023 Notes outstanding (Level 2) | $ 464,958,000 | $ 647,280,000 |

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