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Convertible Senior Notes (Tables) | 9 Months Ended
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Sep. 30, 2019
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Coupon Rates on Financing Arrangements | The following table summarizes information about the 2019 Notes and 2023 Notes (in thousands):
| September 30, 2019 |  | December 31, 2018
Principal amount of 2019 Notes outstanding | $ | — |  |  | $ | 27,326 |
Unamortized discount (including unamortized debt issuance cost) | — |  |  | (893) |
Total current portion of notes payable | $ | — |  |  | $ | 26,433 |
Principal amount of 2023 Notes outstanding | $ | 750,000 |  |  | $ | 750,000 |
Unamortized discount (including unamortized debt issuance cost) | (118,467) |  |  | (140,136) |
Total long-term portion of notes payable | $ | 631,533 |  |  | $ | 609,864 |
Carrying value of equity component of 2023 Notes | $ | 108,205 |  |  | $ | 127,997 |
Fair value of both 2019 Notes and 2023 Notes outstanding (Level 2) | $ | 625,088 |  |  | $ | 713,533 |

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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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