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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2018
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 2019 Notes and 2023 Notes (in thousands).
| December 31, 2018 |  | December 31, 2017
Principle amount of 2019 Notes outstanding | $ | 27,326 |  | $ | 245,000
Unamortized discount (including unamortized debt issuance cost) | (893) |  | (20,471)
Total current portion of notes payable | $ | 26,433 |  | $ | 224,529
Principle amount of 2023 Notes outstanding | $ | 750,000 |  | $ | —
Unamortized discount (including unamortized debt issuance cost) | (140,136) |  | —
Total long-term portion of notes payable | $ | 609,864 |  | $ | —
Carrying value of equity component of 2023 Notes | $ | 127,997 |  | $ | —
Fair value of convertible senior notes outstanding (Level 2) | $ | 713,533 |  | $ | 446,360

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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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