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Fair Value - Additional Information (Detail) - USD ($)
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Financial assets transfers level 1 to 2 $ 0  
Financial assets transfers level 2 to 1 0  
Financial liabilities transfers level 1 to 2 0  
Financial liabilities transfers level 2 to 1 0  
Liabilities measured at fair value   $ 3,447,000
Fair Value, Measurements, Recurring [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Assets measured at fair value 0  
Liabilities measured at fair value $ 0