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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, 2018
Dec. 31, 2017
Dec. 31, 2016
Current:      
Federal $ 0 $ 0 $ 0
State 2 2 2
Foreign 302 319 139
Total current 304 321 141
Deferred:      
Federal 0 0 (212)
State 0 0 0
Foreign 0 0 0
Total deferred 0 0 (212)
Total provision for (benefit from) income taxes $ 304 $ 321 $ (71)