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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | $ 9,358 | $ 5,106 | $ 22,049 | $ 15,009
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 | 4,200 | 300 | 6,600 | 600
Restricted Stock Units (RSUs) |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 4,700 | 4,400 | 14,100 | 13,200
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 | 1,200
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 602 | 280 | 1,250 | 824
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 2,976 | 1,893 | 7,436 | 5,669
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 1,900 | 1,211 | 4,550 | 3,413
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | $ 3,880 | $ 1,722 | $ 8,813 | $ 5,103

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