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STOCK-BASED COMPENSATION PLANS - Stock-Based Compensation (Details) - USD ($)		3 Months Ended	12 Months Ended
	Dec. 13, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Tax benefit for employee stock-based compensation			$ 0	$ 0	$ 0
Stock-based compensation			11,072,000	25,657,000	19,768,000
Unrecognized stock-based compensation expense			$ 10,700,000
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				8,600,000
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation			$ 2,935,000	$ 4,885,000	$ 6,209,000
Restatement Adjustment | Sales and marketing | Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation		$ (1,000,000)

X

- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period.

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