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Income Taxes - Schedule of Components of Provision (Benefit) for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Current:      
Federal $ (736)   $ 144
State 156 $ 172 (473)
Foreign 396 137 111
Current, Total (184) 309 (218)
Deferred:      
Federal   (55) (274)
Foreign (172) (23) 91
Deferred Income Tax Expense (Benefit) (172) (78) (183)
Provision (benefit) for income taxes $ (356) $ 231 $ (401)