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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Cost of product revenue        
Stock-based compensation $ 20 $ 14 $ 53 $ 42
Research and development        
Stock-based compensation 2,969 2,337 9,048 6,526
Sales, general and administrative        
Stock-based compensation $ 3,975 $ 3,092 $ 11,068 $ 8,788