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Fair Value - Additional Information (Detail) - USD ($)
6 Months Ended 12 Months Ended
Jun. 30, 2020
Dec. 31, 2019
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Fair value, level transfers, Amount $ 0 $ 0
Assets Measured at Fair Value on a Non-recurring Basis [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]    
Liabilities measured at fair value on a non-recurring basis $ 0 $ 0