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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

X

- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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