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Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($) | Jun. 30, 2022 | Dec. 31, 2021 | May 31, 2018
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Notes Payable, Current and Noncurrent [Abstract] |  |  |
Principal amount of the 2023 Notes outstanding | $ 115,499,000 | $ 343,301,000 | $ 750,000,000
Unamortized discount (including unamortized debt issuance cost) | (525,000) | (22,584,000) |
Total long-term portion of notes payable | 114,974,000 | 320,717,000 |
Fair value of the 2023 Notes outstanding (Level 2) | $ 110,590,000 | $ 341,801,000 |

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