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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Cost of revenue        
Stock-based compensation $ 14 $ 12 $ 42 $ 51
Research and development        
Stock-based compensation 2,337 1,548 6,526 5,303
Sales, general and administrative        
Stock-based compensation $ 3,092 $ 2,008 $ 8,788 $ 6,395