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Condensed Consolidated Statements of Operations (Parenthetical) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Stock-based compensation | $ (1,252) | $ (1,294) |  |
Cost of revenue |  |  |  |
Stock-based compensation | 21 | (47) | $ 67 | $ 20
Cost of revenue | Acquired intangible assets |  |  |  |
Amortization of acquired intangible assets | 0 | 0 | 0 | 72
Research and development |  |  |  |
Stock-based compensation | 452 | 565 | 1,470 | 1,795
Selling, general and administrative |  |  |  |
Stock-based compensation | 779 | 776 | 2,140 | 2,223
Amortization of acquired intangible assets | $ 0 | $ 0 | $ 0 | $ 18

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