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Fair Value Measurement of Assets and Liabilities - Other Financial Instruments (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
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Convertible Debt |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Principal | $ 105,125 | $ 105,125
Level 3 | Fair Value, Measurements, Nonrecurring |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Convertible debt, fair value | $ 101,300 | $ 93,100

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