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Fair Value Measurement - Additional Information (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Probability of low case scenario | 20.00% |
Probability of base case scenario | 75.00% |
Probability of high case scenario | 5.00% |
Fair Value, Measurements, Nonrecurring [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Assets recorded at fair value on a non-recurring basis | $ 0 | $ 0
Hybrid Instrument | Measurement Input, Discount Rate |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Derivative liability, measurement input | 0.18 |

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