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Convertible Senior Notes - Notes Payable (Details) - USD ($) | Sep. 30, 2018 | May 22, 2018 | Dec. 31, 2017 | Aug. 31, 2014
--- | --- | --- | --- | ---
Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Carrying value of equity component of 2023 Notes | $ 0 |  | $ 18,859,000 |
Convertible Notes | 2019 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Principal amount of 2019 Notes outstanding | 223,215,000 |  | 245,000,000 | $ 245,000,000.0
Unamortized discount (including unamortized debt issuance cost) | (10,071,000) |  | (20,471,000) |
Total current portion of notes payable | 213,144,000 |  | 224,529,000 |
Convertible Notes | 2023 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Principal amount of 2019 Notes outstanding | 750,000,000 | $ 750,000,000 | 0 |
Unamortized discount (including unamortized debt issuance cost) | (147,161,000) |  | 0 |
Total long-term portion of notes payable | 602,839,000 |  | 0 |
Carrying value of equity component of 2023 Notes | 143,986,000 |  | 0 |
Fair value of convertible senior notes outstanding (Level 2) | $ 1,729,179,000 |  | $ 446,360,000 |

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