Business Combination, Additional Consideration Transferred for Assumed Options

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Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Deferred Revenue

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Business Combination, Unpaid Cash Consideration

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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Amount of equity interests of the acquirer, including instruments or interests issued or issuable in consideration for the business combination.

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- Definition

Amount of assets that are expected to be realized or consumed within one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of other assets expected to be realized or consumed before one year or the normal operating cycle, if longer, acquired at the acquisition date.

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Amount of liabilities due within one year or within the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred revenue expected to be recognized as such within one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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The amount of property, plant, and equipment recognized as of the acquisition date.

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Amount recognized for assets, including goodwill, in excess of (less than) the aggregate liabilities assumed.

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The cash inflow associated with the acquisition of business during the period (for example, cash that was held by the acquired business).

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount paid to managing member or general partner for management of the day-to-day business functions of the limited liability company (LLC) or limited partnership (LP).

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The cash outflow associated with the acquisition of a business, net of the cash acquired from the purchase.

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BUSINESS ACQUISITONS - SCHEDULE OF EDGEWATER PURCHASE PRICE ALLOCATION (Details) - USD ($) $ in Thousands			12 Months Ended
	Jun. 24, 2018	Oct. 27, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Net cash consideration			$ 46,389	$ 42,951	$ 20,669
Fair value of Ribbon stock issued		$ 413,982
Goodwill			383,655	$ 335,716	$ 49,393
Edgewater
Business Acquisition [Line Items]
Cash paid to Edgewater Selling Stakeholders			51,162
Less cash acquired			(4,773)
Net cash consideration	$ 46,400		46,389
Unpaid cash consideration			30,000
Fair value of Ribbon stock issued			30,000
Fair value of equity awards assumed (see Note 16)	$ 700		747
Fair value of total consideration			107,136
Current assets			16,098
Property and equipment			245
Goodwill			48,053
Other noncurrent assets			103
Deferred revenue			(2,749)
Other current liabilities			(9,926)
Deferred revenue, net of current			(669)
Other long-term liabilities			(719)
Assets acquired and liabilities assumed			107,136
Developed technology \| Edgewater
Business Acquisition [Line Items]
Finite-lived intangibles			29,500
Customer relationships \| Edgewater
Business Acquisition [Line Items]
Finite-lived intangibles			26,100
Trade names \| Edgewater
Business Acquisition [Line Items]
Finite-lived intangibles			$ 1,100