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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Cost of product revenue |  |
Stock-based compensation | $ 0 | $ 1
Research and development |  |
Stock-based compensation | 2,613 | 3,210
Sales, general and administrative |  |
Stock-based compensation | $ 3,459 | $ 3,978

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