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Income Taxes - Summary of Income Tax Expense (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 0 $ 0 $ 0
State (153) 5 5
Foreign 61 63 44
Total current (92) 68 49
Deferred:      
Federal 0 0 0
State 0 0 0
Foreign (137) 0 0
Total deferred (137) 0 0
Total provision $ (229) $ 68 $ 49