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Income Taxes - Components of Provision From Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal $ 0 $ 0 $ 0
State 2 0 0
Foreign 240 0 0
Total current 242 0 0
Deferred:      
Federal 0 0 0
State 0 0 0
Foreign 0 0 0
Total deferred 0 0 0
Total provision from income taxes $ 242 $ 0 $ 0