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Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | May 31, 2018 | Aug. 31, 2014
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Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Fair value of convertible senior notes outstanding (Level 2) | $ 625,088,000 | $ 713,533,000 |  |
2019 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Principal amount of Notes outstanding | 0 | 27,326,000 |  | $ 245,000,000.0
Unamortized discount (including unamortized debt issuance cost) | 0 | (893,000) |  |
Total current portion of notes payable | 0 | 26,433,000 |  |
2023 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Principal amount of Notes outstanding | 750,000,000 | 750,000,000 | $ 750,000,000.0 |
Unamortized discount (including unamortized debt issuance cost) | (118,467,000) | (140,136,000) |  |
Total long-term portion of notes payable | 631,533,000 | 609,864,000 |  |
Carrying value of equity component of 2023 Notes | $ 108,205,000 | $ 127,997,000 |  |

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