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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Cash consideration:          
Net cash consideration     $ 0 $ 46,389 $ 42,951
Fair value of Ribbon stock issued   $ 413,982      
Intangible assets:          
Goodwill     224,896 $ 383,655 $ 335,716
Edgewater          
Cash consideration:          
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    
Fair value of assets acquired and liabilities assumed:          
Current assets, net of cash acquired     16,098    
Property and equipment     245    
Intangible assets:          
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          
Intangible assets:          
Finite-lived intangibles     29,500    
Customer relationships | Edgewater          
Intangible assets:          
Finite-lived intangibles     26,100    
Trade names | Edgewater          
Intangible assets:          
Finite-lived intangibles     $ 1,100