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Financial Instruments - Additional Information (Detail) | Dec. 31, 2019 USD ($)
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Measurement Input, Discount Rate | Probability Weighted |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Measurement input | 0.135
Measurement Input, Discount Rate | Monte Carlo |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Measurement input | 0.136
Measurement Input, Price Volatility | Monte Carlo |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Measurement input | 0.300

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