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Income Taxes - Reconciliation of U.S. Federal Statutory Income Tax Rate (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]    
Statutory Federal income tax rate $ (4,460) $ (1,923)
Foreign losses 59 328
Tax credits (2) (58)
Change in statutory rates 1,859  
Stock-based compensation 135  
Permanent items 693  
Other 43 404
Change in valuation allowance $ 1,673 $ 1,249