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STOCK PLANS AND SHARE BASED COMPENSATION (Stock-Based Compensation) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 22,364 | $ 37,609 | $ 30,912
Unrecognized Compensation Expense for Unvested Awards | 46,906 |  |
Long-Term Performance-Based Awards (PRSUs) |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Unrecognized Compensation Expense for Unvested Awards | $ 0 |  |
Weighted Average Remaining Recognition Period | 0 years |  |
Restricted Stock Units (RSUs) |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 23,200 | 19,900 | 18,700
Unrecognized Compensation Expense for Unvested Awards | $ 46,724 |  |
Weighted Average Remaining Recognition Period | 2 years 9 months 29 days |  |
Employee Stock Purchase Plan |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 1,900 | 2,000 | 2,000
Unrecognized Compensation Expense for Unvested Awards | $ 182 |  |
Weighted Average Remaining Recognition Period | 1 month |  |
Cost of revenues |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 1,132 | 2,359 | 1,963
Research and development |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 10,428 | 12,127 | 10,378
Sales and marketing |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | 6,035 | 7,630 | 6,290
General and administrative |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |
Stock-based compensation expense | $ 4,769 | $ 15,493 | $ 12,281

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