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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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