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Income Taxes - Schedule of Components of Provision For (Benefit From) Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 0 $ 0 $ 0
State 2 2 0
Foreign 139 240 0
Total current 141 242 0
Deferred:      
Federal (212) 0 0
State 0 0 0
Foreign 0 0 0
Total deferred (212) 0 0
Total provision for (benefit from) income taxes $ (71) $ 242 $ 0