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Convertible Senior Notes - Equity and Liability Components of Financing Arrangements (Details) - USD ($) | Dec. 31, 2018 | May 22, 2018 | Dec. 31, 2017 | Aug. 31, 2014
--- | --- | --- | --- | ---
Notes Payable, Current and Noncurrent |  |  |  |
Carrying value of equity component of 2023 Notes | $ 0 |  | $ 18,859,000 |
Convertible Notes |  |  |  |
Notes Payable, Current and Noncurrent |  |  |  |
Total current portion of notes payable | 26,433,000 |  | 224,529,000 |
Total long-term portion of notes payable | 609,864,000 |  | 0 |
Fair value of convertible senior notes outstanding (Level 2) | 713,533,000 |  | 446,360,000 |
Convertible Notes | 2019 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent |  |  |  |
Principal amount outstanding | 27,326,000 |  | 245,000,000 | $ 245,000,000.0
Unamortized discount | (893,000) |  | (20,471,000) |
Convertible Notes | 2023 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent |  |  |  |
Principal amount outstanding | 750,000,000 | $ 750,000,000 | 0 |
Unamortized discount | (140,136,000) |  | 0 |
Carrying value of equity component of 2023 Notes | $ 127,997,000 |  | $ 0 |

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