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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2011
Income Taxes [Line Items]      
Recognition of a valuation allowance against deferred tax assets in the U.S $ 11,280 $ 8,590  
Net operating loss carry forwards, federal 17,300    
Net operating loss carry forwards, state $ 14,000    
Income tax examination, year under examination 2008    
Annual net operating loss carry forward limitation expiration year 2027    
Effective tax rate 34.00% 34.00%  
Annual Net Operating Loss Carry Forward Limitation      
Income Taxes [Line Items]      
Net operating loss carry forwards related to business combination $ 7,400    
Annual Net Operating Loss Carry Forward Limitation | U.S. federal | Internal Revenue Service (IRS)      
Income Taxes [Line Items]      
Net operating loss carry forwards subject to expiration     $ 299
Earliest Tax Year      
Income Taxes [Line Items]      
Operating loss carry forwards expiration date Dec. 31, 2019    
Latest Tax Year      
Income Taxes [Line Items]      
Operating loss carry forwards expiration date Dec. 31, 2032