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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Cost of revenue      
Stock-based compensation $ 63 $ 44 $ 19
Research and development      
Stock-based compensation 6,762 7,216 6,597
Sales, general and administrative      
Stock-based compensation $ 8,271 $ 7,470 $ 8,365