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Income Taxes - Components of Income Tax (Provision) Benefit (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Current income tax provision      
Federal $ (184)    
State (140) $ (144) $ (95)
Foreign (1,508) (1,077) (579)
Total current income tax provision (1,832) (1,221) (674)
Deferred income tax benefit      
Federal 21 10,435 61
State   977  
Foreign (57) 134 80
Total deferred income tax benefit (36) 11,546 141
Total income tax benefit (provision) $ (1,868) $ 10,325 $ (533)