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RELATED PARTIES (Details) - USD ($)	Apr. 29, 2019	Dec. 31, 2019	Dec. 31, 2018	Oct. 27, 2017
GENBAND
Related Party Transaction [Line Items]
Promissory note issued to GENBAND equity holders				$ 22,500,000.0
Minimum | GENBAND
Related Party Transaction [Line Items]
Promissory note interest rate		7.50%
Maximum | GENBAND
Related Party Transaction [Line Items]
Promissory note interest rate		10.00%
Promissory Note
Related Party Transaction [Line Items]
Promissory note issued to GENBAND equity holders			$ 22,500,000
Promissory note balance			24,100,000
Interest converted to principal			$ 1,600,000
Notes Payable, Other Payables | Promissory Note
Related Party Transaction [Line Items]
Repayments of outstanding amounts	$ 24,700,000

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