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Convertible Senior Notes - Notes Payable (Details) - Convertible Notes - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | May 31, 2018 | Aug. 31, 2014
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2019 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent [Abstract] |  |  |  |
Principal amount of Notes outstanding | $ 27,323,000 | $ 27,326,000 |  | $ 245,000,000.0
Unamortized discount (including unamortized debt issuance cost) | (567,000) | (893,000) |  |
Total current portion of notes payable | 26,756,000 | 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) | (133,013,000) | (140,136,000) |  |
Total long-term portion of notes payable | 616,987,000 | 609,864,000 |  |
Fair value of convertible senior notes outstanding (Level 2) | $ 687,180,000 | $ 713,533,000 |  |

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