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CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Cost of revenue      
Stock-based compensation $ 56 $ 63 $ 44
Research and development      
Stock-based compensation 9,165 6,762 7,216
Sales, general and administrative      
Stock-based compensation $ 11,792 $ 8,271 $ 7,470