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Income Taxes - Schedule of Domestic and Foreign Components of Income (Loss) Before Income Taxes and before the Gain from Sale of Equity Method Investment (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]      
Domestic $ (1,591) $ (6,034) $ 1,373
Foreign 1,493 4 (1,615)
Loss before income taxes $ (98) $ (6,030) $ (242)