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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

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