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Debt - Equity and Liability Components of Financing Arrangements (Details) - Convertible Notes - 2023 Convertible Senior Notes - USD ($) | Dec. 31, 2022 | May 31, 2018
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Notes Payable, Current and Noncurrent |  |
Principal amount of 2023 Notes outstanding | $ 76,854,000 | $ 750,000,000
Unamortized discount (including unamortized debt issuance cost) | (159,000) |
Total long-term portion of notes payable | 76,695,000 |
Fair value of convertible senior notes outstanding (Level 2) | $ 74,789,000 |

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