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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, 2015
Dec. 31, 2014
Current provision:    
Federal $ 443  
Foreign 131  
Total current provision 574  
Deferred provision (benefit):    
Federal (114) $ (309)
States (32) (25)
Total deferred provision (benefit): (146) (334)
Total provision (benefit) for income taxes $ 428 $ (334)