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Fair Value Measurements - Additional Information (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | 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 | $ 0 | $ 585 |
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 | $ 73,000 | 126,000 |
Carrying value of convertible debt | $ 162,661 | $ 157,560 | $ 143,723

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