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STOCK-BASED COMPENSATION - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ 6,752 | $ 3,679 | $ 14,120 | $ 12,692
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 | 5,300 | 11,200 | 10,900
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 | 1,000 | 2,100 | 1,900 | 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 | 500 | 1,000 | 900
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 446 | 235 | 747 | 555
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 2,429 | 2,323 | 5,097 | 5,378
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 1,621 | 1,177 | 3,274 | 3,125
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ 2,256 | $ (56) | $ 5,002 | $ 3,634

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