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STOCK PLANS - Schedule of Stock Based Compensation Expenses (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-Based Compensation |  |  |  |
Stock-based compensation expense | $ 10,784 | $ 10,954 | $ 31,356 | $ 29,024
Stock-based compensation from: |  |  |  |
Stock options | 6,458 | 7,181 | 19,507 | 19,795
Restricted stock units | 4,126 | 3,552 | 11,164 | 8,589
Employee stock purchase plan | 200 | 221 | 685 | 640
Total | 10,784 | 10,954 | 31,356 | 29,024
Cost of goods sold |  |  |  |
Share-Based Compensation |  |  |  |
Stock-based compensation expense | 1,512 | 1,546 | 4,429 | 4,050
Research and development |  |  |  |
Share-Based Compensation |  |  |  |
Stock-based compensation expense | 1,156 | 1,401 | 3,591 | 3,944
Selling, general and administrative |  |  |  |
Share-Based Compensation |  |  |  |
Stock-based compensation expense | $ 8,116 | $ 8,007 | $ 23,336 | $ 21,030

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