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Income Taxes - Summary of Provision for Income Taxes (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Current:      
Federal $ 0 $ 0 $ (248)
State (6) 21 33
Foreign 81 16 (229)
Total Current 75 37 (444)
Deferred:      
Federal 0 0 53
State 0 0 0
Foreign 106 87 474
Total Deferred 106 87 527
Provision for income taxes $ 181 $ 124 $ 83