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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, 2016
Dec. 31, 2015
Current provision:    
Federal   $ 443
Foreign $ 119 131
Total current provision 119 574
Deferred provision (benefit):    
Federal (24) (114)
States (51) (32)
Total deferred provision (benefit): (75) (146)
Total provision (benefit) for income taxes $ 44 $ 428