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Income Taxes - Additional Information (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Examination [Line Items]      
Net operating loss carryforward $ 109 $ 157 $ 572
Corporate income tax rate 35.00% 35.00% 35.00%
Income tax examination net of federal and state tax benefit, accrued interest $ 29 $ 42  
Reduction in income tax liability if tax positions sustained 122    
Change in unrecognized tax benefits reasonably possible $ 54    
Income tax examination years description The Company is no longer subject to U.S. Federal income tax examinations for the years prior to 2014.    
State Jurisdiction      
Income Tax Examination [Line Items]      
Net operating loss carryforward $ 13,100    
Net operating loss carryforward expiration 2026    
State Jurisdiction | Minimum      
Income Tax Examination [Line Items]      
Income tax examination year 2012    
State Jurisdiction | Maximum      
Income Tax Examination [Line Items]      
Income tax examination year 2015    
Foreign      
Income Tax Examination [Line Items]      
Net operating loss carryforward $ 5,800    
Net operating loss carryforward expiration 2020    
UNITED KINGDOM | Fiscal Year 2016      
Income Tax Examination [Line Items]      
Corporate income tax rate 20.00%    
UNITED KINGDOM | Fiscal Year 2020      
Income Tax Examination [Line Items]      
Corporate income tax rate 17.00%