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Convertible Senior Notes - Equity and Liability Components of Financing Arrangements (Details) - Convertible Notes - USD ($) | Dec. 31, 2019 | Dec. 31, 2018 | May 22, 2018 | Aug. 31, 2014
--- | --- | --- | --- | ---
Notes Payable, Current and Noncurrent |  |  |  |
Total current portion of notes payable |  | $ 26,433,000 |  |
Total long-term portion of notes payable | $ 638,959,000 | 609,864,000 |  |
Fair value of convertible senior notes outstanding (Level 2) | 647,280,000 | 713,533,000 |  |
2019 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent |  |  |  |
Principal amount outstanding | 0 | 27,326,000 |  | $ 245,000,000.0
Unamortized discount | 0 | (893,000) |  |
2023 Convertible Senior Notes |  |  |  |
Notes Payable, Current and Noncurrent |  |  |  |
Principal amount outstanding | 750,000,000 | 750,000,000 | $ 750,000,000 |
Unamortized discount | (111,041,000) | (140,136,000) |  |
Carrying value of equity component of 2023 Notes | $ 101,422,000 | $ 127,997,000 |  |

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