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STOCK-BASED COMPENSATION Stock-Based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | $ 5,496 | $ 6,115 | $ 9,903 | $ 11,740
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 | 900 | 1,800 | 300 | 2,700
Restricted Stock Units (RSUs) |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 4,200 | 3,900 | 8,800 | 8,200
Employee Stock Purchase Plan |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 400 | 400 | 800 | 800
Cost of revenues |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 273 | 292 | 544 | 541
Research and development |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 2,144 | 2,271 | 3,776 | 4,110
Sales and marketing |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | 1,141 | 1,126 | 2,202 | 2,402
General and administrative |  |  |  |
Stock-based compensation expense for stock options, stock awards and employee stock purchases included in operations: |  |  |  |
Stock-Based Compensation Expense | $ 1,938 | $ 2,426 | $ 3,381 | $ 4,687

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