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Income Taxes - Components of Provision (Benefit) for Income Taxes by Taxing Authority (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Current provision:    
Foreign $ 78 $ 119
Total current provision 78 119
Deferred provision (benefit):    
Federal (3,033) (24)
States   (51)
Total deferred provision (benefit): (3,033) (75)
Total provision (benefit) for income taxes $ (2,955) $ 44