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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2021
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Coupon Rates on Financing Arrangements | The following table summarizes information about the 2023 Notes (in thousands):
| September 30, 2021 |  | December 31, 2020
Principal amount of the 2023 Notes outstanding | $ | 343,301 |  |  | $ | 495,280 |
Unamortized discount (including unamortized debt issuance cost) | (26,412) |  |  | (52,987) |
Total long-term portion of notes payable | $ | 316,889 |  |  | $ | 442,293 |
Carrying value of equity component of the 2023 Notes | $ | 24,124 |  |  | $ | 48,397 |
Fair value of the 2023 Notes outstanding (Level 2) | $ | 343,888 |  |  | $ | 466,053 |

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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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