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STOCK-BASED COMPENSATION PLANS - Stock Option Activity (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Weighted average exercise price
Granted (in dollars per share)	$ 0.00
Range of assumptions used in estimating fair value of options
Expected dividends	0.00%	0.00%	0.00%
Expected life (in years)		5 years
Stock options
Number of shares
Outstanding at the beginning of the period (in shares)	435,187
Granted (in shares)	0
Edgewater outstanding options converted to Ribbon options (in shares)	312,452
Exercised (in shares)	(15,935)
Forfeited (in shares)	(35,431)
Expired (in shares)	(114,212)
Outstanding at the end of the period (in shares)	582,061	435,187
Vested or expected to vest at the end of the period (in shares)	560,325
Exercisable at the end of the period (in shares)	428,097
Weighted average exercise price
Outstanding at the beginning of the period (in dollars per share)	$ 14.71
Edgewater outstanding options converted to Ribbon options (in dollars per share)	1.97
Exercised (in dollars per share)	4.58
Forfeited (in dollars per share)	1.81
Expired (in dollars per share)	14.33
Outstanding at the end of the period (in dollars per share)	9.01	$ 14.71
Vested or expected to vest at the end of the period (in dollars per share)	9.27
Exercisable at the end of the period (in dollars per share)	$ 11.47
Weighted average remaining contractual life (in years)
Outstanding at the end of the period	4 years 9 months 27 days
Vested or expected to vest at the end of the period	4 years 8 months 2 days
Exercisable at the end of the period	3 years 7 months 5 days
Aggregate intrinsic value (in dollars)
Outstanding at the end of the period (in dollars)	$ 774
Vested or expected to vest at the end of the period (in dollars)	720
Exercisable at the end of the period (in dollars)	$ 366
Range of assumptions used in estimating fair value of options
Risk-free interest rates, minimum		1.22%	1.00%
Risk-free interest rates, maximum		1.95%	1.61%
Weighted average volatility		51.10%	54.80%

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- Definition

The number of shares under options of acquired entity that were converted into entity's options.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The maximum risk-free interest rate assumption that is used in valuing an option on its own shares.

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Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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