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BUSINESS ACQUISITONS - GENBAND MERGER (Details) - USD ($) |  | 12 Months Ended |
--- | --- | --- | ---
Oct. 27, 2017 | Dec. 31, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Business Acquisition [Line Items] |  |  |  |
Debt average interest rate |  |  |  | 5.96%
Former Sonus Networks Inc. shareholders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of ownership after transaction |  | 50.00% |  |
Former GENBAND Holdings Company and two related holding companies shareholders |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Sale of stock, percentage of ownership after transaction | 50.00% |  |  |
GENBAND |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Shares issued as consideration in connection with acquisition (in shares) | 50,900,000.0 |  | 50,857,708 |
Repayments of long-term debt | $ 47,973,000 |  |  |
Payment of GENBAND management fee | 10,302,000 |  |  |
Promissory note issued to GENBAND equity holders | $ 22,500,000.0 |  |  |
Debt average interest rate | 4.67% |  |  |
Weighted average life of identifiable intangible assets (in years) |  | 8 years 3 months 18 days |  |
GENBAND | Line of Credit |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt assumed as part of GENBAND merger | $ 17,900,000 |  |  |
GENBAND | Letter of Credit |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Debt assumed as part of GENBAND merger | $ 2,900,000 |  |  |

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