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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ 3,679 | $ 9,200 | $ 12,692 | $ 17,680
Restricted Stock Units (RSUs) |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 5,300 | 4,700 | 10,900 | 10,000
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 | (2,100) | 4,000 | 900 | 6,700
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 | 500 | 900 | 1,000
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 235 | 640 | 555 | 1,271
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 2,323 | 3,159 | 5,378 | 5,550
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 1,177 | 1,725 | 3,125 | 3,339
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ (56) | $ 3,676 | $ 3,634 | $ 7,520

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