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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Stock-based compensation |  |
Stock-based compensation | $ 2,976,000 | $ 4,139,000
Tax benefit from stock based compensation expense | 0 | 0
Fair value of the assumed awards attributable to future stock-based compensation expense | $ 26,300,000 |
Expected period for unrecognized expense | 3 years |
Product cost of revenue |  |
Stock-based compensation |  |
Stock-based compensation | $ 27,000 | 14,000
Service cost of revenue |  |
Stock-based compensation |  |
Stock-based compensation | 130,000 | 92,000
Research and development |  |
Stock-based compensation |  |
Stock-based compensation | 558,000 | 507,000
Sales and marketing |  |
Stock-based compensation |  |
Stock-based compensation | 752,000 | 984,000
General and administrative |  |
Stock-based compensation |  |
Stock-based compensation | $ 1,509,000 | $ 2,542,000

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