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Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Current:      
Federal $ 0 $ 0 $ 0
State 0 (6) 21
Foreign 185 81 16
Total current 185 75 37
Deferred:      
Federal 156 0 0
State 0 0 0
Foreign 40 106 87
Total deferred 196 106 87
Provision for income taxes $ 381 $ 181 $ 124