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v3.19.1

Fair Value Measurements - Additional Information (Details) - USD ($) | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018 | Jul. 31, 2018
Significant Unobservable Inputs (Level 3) |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Fair value of financial liabilities measured at fair value on a recurring basis | $ 585,000 | $ 585,000 |
Changes in fair value of Level 3 liabilities | $ 0 |  |
3.5% Convertible Notes Due 2023 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Debt instrument, interest rate, stated percentage | 3.50% |  | 3.50%
Fair value of convertible debt | $ 122,000,000 | 141,000,000 |
Carrying value of convertible debt | $ 150,314,000 | $ 148,101,000 | $ 143,723,000

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