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STOCK-BASED COMPENSATION - Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ 6,905 | $ 3,018 | $ 21,025 | $ 15,710
Restricted Stock Units (RSUs) |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 6,100 | 6,400 | 17,300 | 17,300
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 | 300 | (3,900) | 2,300 | (2,900)
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 | 1,400 | 1,300
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 446 | 172 | 1,193 | 727
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 2,895 | 2,334 | 7,992 | 7,712
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | 1,787 | 1,267 | 5,061 | 4,392
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-based compensation expense | $ 1,777 | $ (755) | $ 6,779 | $ 2,879

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