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Debt - Convertible Notes (Details) - Convertible debt - USD ($) | Sep. 30, 2019 | Dec. 31, 2018 | Aug. 31, 2015
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3.00% Convertible senior notes due 2022 |  |  |
Long-term debt |  |  |
Principal | $ 150,000,000 | $ 150,000,000 | $ 150,000,000.0
Less: Debt issuance costs | (1,438,000) | (1,746,000) |
Less: Debt discount, net | (28,862,000) | (35,054,000) |
Net carrying amount | 119,700,000 | $ 113,200,000 |
1.50% Convertible senior notes due 2026 |  |  |
Long-term debt |  |  |
Principal | 287,500,000 |  |
Less: Debt issuance costs | (4,692,000) |  |
Less: Debt discount, net | (122,618,000) |  |
Net carrying amount | $ 160,190,000 |  |

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