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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended
--- | ---
Mar. 31, 2022 | Mar. 31, 2021
Stock-based compensation |  |
Stock-based compensation | $ 4,255 | $ 5,060
Product cost of revenue |  |
Stock-based compensation |  |
Stock-based compensation | 99 | 27
Service cost of revenue |  |
Stock-based compensation |  |
Stock-based compensation | 481 | 235
Research and development |  |
Stock-based compensation |  |
Stock-based compensation | 1,206 | 627
Sales and marketing |  |
Stock-based compensation |  |
Stock-based compensation | 1,371 | 1,874
General and administrative |  |
Stock-based compensation |  |
Stock-based compensation | $ 1,098 | $ 2,297

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