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Income Taxes - Summary of Benefit for Income Taxes (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Deferred:    
Federal $ (12) $ (5,563)
State (2) (159)
Subtotal (14) (5,722)
Income tax benefit $ (14) $ (5,722)