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Convertible Senior Notes (Tables) | 3 Months Ended
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Mar. 31, 2019
Debt Disclosure [Abstract] |
Schedule of Carrying Values and Coupon Rates on Financing Arrangements | The following table summarizes information about the equity and liability components of the 2019 Notes and 2023 Notes (in thousands):
| March 31, 2019 |  | December 31, 2018
Principal amount of 2019 Notes outstanding | $ | 27,323 |  | $ | 27,326
Unamortized discount (including unamortized debt issuance cost) | (567) |  | (893)
Total current portion of notes payable | $ | 26,756 |  | $ | 26,433
Principal amount of 2023 Notes outstanding | $ | 750,000 |  | $ | 750,000
Unamortized discount (including unamortized debt issuance cost) | (133,013) |  | (140,136)
Total long-term portion of notes payable | $ | 616,987 |  | $ | 609,864
Fair value of convertible senior notes outstanding (Level 2) | $ | 687,180 |  | $ | 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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