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Income Taxes - Additional Information (Detail) - USD ($)
 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Income Taxes [Line Items]    
Net deferred tax asset $ 0  
Income tax expense 0  
Dividend from subsidiaries $ 4,400,000  
Estimated annual effective tax rate 11.22%  
Effective tax rate   0.00%
Federal [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 4,400,000  
Net operating loss carryforwards subject to expiration $ 158,800,000  
Net operating loss carryforwards expiration year 2025  
Net operating loss carryforwards expiration year 2035  
Foreign [Member]    
Income Taxes [Line Items]    
Net operating loss carryforwards $ 4,800,000  
Net operating loss carryforwards subject to expiration $ 30,000,000