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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2020
Debt Disclosure [Abstract] |
Schedule of Equity and Liability Components of the Convertible Senior Notes | The following table summarizes information about the equity and liability components of the 2023 Notes (in thousands).
| December 31, 2020 |  | December 31, 2019
Principal amount of 2023 Notes outstanding | $ | 495,280 |  |  | $ | 750,000 |
Unamortized discount (including unamortized debt issuance cost) | (52,987) |  |  | (111,041) |
Total long-term portion of notes payable | $ | 442,293 |  |  | $ | 638,959 |
Carrying value of equity component of 2023 Notes | $ | 48,397 |  |  | $ | 101,422 |
Fair value of convertible senior notes outstanding (Level 2) | $ | 466,053 |  |  | $ | 647,280 |

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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