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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ 3,018 | $ 9,645 | $ 15,710 | $ 27,325
Restricted Stock Units (RSUs) |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 6,400 | 5,000 | 17,300 | 15,000
Performance Based Awards and Long Term Performance based Units |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | (3,900) | 4,200 | (2,900) | 10,900
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 500 | 400 | 1,300 | 1,400
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 172 | 664 | 727 | 1,935
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 2,334 | 3,055 | 7,712 | 8,605
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 1,267 | 2,201 | 4,392 | 5,540
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ (755) | $ 3,725 | $ 2,879 | $ 11,245

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