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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($) |  | 12 Months Ended
--- | --- | ---
Dec. 13, 2017 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Tax benefit for employee stock-based compensation |  | $ 0 | $ 0 | $ 0
Stock-based compensation |  | 12,601,000 | 11,072,000 | 25,657,000
Unrecognized stock-based compensation expense |  | $ 11,300,000 |  |
Weighted average period (in years) |  | 2 years |  |
Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation | $ 1,600,000 |  |  |
GENBAND | Stock options |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation |  | $ 1,600,000 |  | 8,600,000
Sales and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Stock-based compensation |  | $ 3,028,000 | $ 2,935,000 | $ 4,885,000

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