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Convertible Notes (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total convertible notes | $ 143,612 | $ 141,934 |
Convertible notes, long-term | $ 143,612 | 141,934 |
Convertible Notes Payable [Member] | Senior, One Point Three Seven Five Percent Convertible Notes Due Two Thousand Twenty Three [Member] [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Convertible notes stated interest rate (as a percent) | 1.375% |  | 1.375%
Principal amount of convertible notes | $ 172,500 | 172,500 |
Unamortized discount | (26,964) | (28,517) |
Unamortized Debt Issuance Expense | (1,924) | (2,049) |
Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Convertible notes, long-term | 143,612 | 141,934 |
Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Convertible notes, short-term | $ 0 | $ 0 |

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