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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Cost of product revenue |  |  |  |
Stock-based compensation | $ 0 | $ 1 | $ 0 | $ 2
Research and development |  |  |  |
Stock-based compensation | 2,515 | 3,058 | 5,128 | 6,268
Sales, general and administrative |  |  |  |
Stock-based compensation | $ 4,192 | $ 4,021 | $ 7,651 | $ 7,999

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