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DEBT - Promissory Note (Details) - USD ($)	Apr. 29, 2019	Dec. 31, 2019	Dec. 31, 2018	Oct. 27, 2017
GENBAND
Debt Instrument [Line Items]
Promissory note issued to GENBAND equity holders				$ 22,500,000.0
GENBAND | Minimum
Debt Instrument [Line Items]
Promissory note interest rate		7.50%
GENBAND | Maximum
Debt Instrument [Line Items]
Promissory note interest rate		10.00%
Promissory Note
Debt Instrument [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
Debt Instrument [Line Items]
Repayments of outstanding amounts	$ 24,700,000

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Including the current and noncurrent portions, aggregate carrying amount of all types of notes payable, as of the balance sheet date, with initial maturities beyond one year or beyond the normal operating cycle, if longer.

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