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Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($) | Jun. 30, 2021 | Dec. 31, 2020 | May 31, 2018
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Notes Payable, Current and Noncurrent [Abstract] |  |  |
Principal amount of the 2023 Notes outstanding | $ 345,729,000 | $ 495,280,000 | $ 750,000,000.0
Unamortized discount (including unamortized debt issuance cost) | (30,411,000) | (52,987,000) |
Total long-term portion of notes payable | 315,318,000 | 442,293,000 |
Carrying value of equity component of the 2023 Notes | 27,776,000 | 48,397,000 |
Fair value of the 2023 Notes outstanding (Level 2) | $ 341,687,000 | $ 466,053,000 |

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