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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Stock-based compensation |  |  |  |
Stock-based compensation | $ 3,969,000 | $ 2,485,000 | $ 10,167,000 | $ 8,154,000
Tax benefit from stock based compensation expense |  |  | 0 | 0
Fair value of the assumed awards attributable to future stock-based compensation expense | 23,000,000.0 |  | $ 23,000,000.0 |
Expected period for unrecognized expense |  |  | 2 years 6 months |
Product cost of revenue |  |  |  |
Stock-based compensation |  |  |  |
Stock-based compensation | 57,000 | 26,000 | $ 123,000 | 62,000
Service cost of revenue |  |  |  |
Stock-based compensation |  |  |  |
Stock-based compensation | 204,000 | 124,000 | 493,000 | 367,000
Research and development |  |  |  |
Stock-based compensation |  |  |  |
Stock-based compensation | 868,000 | 521,000 | 2,164,000 | 1,359,000
Sales and marketing |  |  |  |
Stock-based compensation |  |  |  |
Stock-based compensation | 1,189,000 | 721,000 | 2,952,000 | 2,265,000
General and administrative |  |  |  |
Stock-based compensation |  |  |  |
Stock-based compensation | $ 1,651,000 | $ 1,093,000 | $ 4,435,000 | $ 4,101,000

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