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Fair Value Measurement - Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 8,722 $ 0
Fair Value, Option, Changes in Fair Value, Gain (Loss) (184)  
Financial and Nonfinancial Liabilities, Fair Value Disclosure 0 $ 0
Fair Value Measurements at Reporting Date Using Level 1 Inputs    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 8,722  
Fair Value Measurements at Reporting Date Using Level 2 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure 0  
Fair Value Measurements at Reporting Date Using Level 3 Inputs [Member]    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets, Fair Value Disclosure $ 0