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Convertible Senior Notes - Equity and Liability Components of Financing Arrangements (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($) | Dec. 31, 2021 | Dec. 31, 2020 | May 22, 2018
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Notes Payable, Current and Noncurrent |  |  |
Principal amount of 2023 Notes outstanding | $ 343,301,000 | $ 495,280,000 | $ 750,000,000
Unamortized discount (including unamortized debt issuance cost) | (22,584,000) | (52,987,000) |
Total long-term portion of notes payable | 320,717,000 | 442,293,000 |
Carrying value of equity component of 2023 Notes | 20,627,000 | 48,397,000 |
Fair value of convertible senior notes outstanding (Level 2) | $ 341,801,000 | $ 466,053,000 |

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