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BUSINESS ACQUISITIONS - Schedule of Preliminary Allocation of Purchase Consideration (Details) - USD ($)
$ in Thousands
 12 Months Ended
Nov. 14, 2019
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Cash consideration:        
Net cash consideration   $ 0 $ 0 $ 346,852
Fair value of assets acquired and liabilities assumed:        
Goodwill   300,892 $ 300,892 $ 416,892
ECI        
Cash consideration:        
Repayment of ECI outstanding debt obligations   183,266    
Cash paid to selling shareholders $ 139,200 139,244    
Payment to selling shareholders from sale of ECI real estate assets   33,400    
Less cash and restricted cash acquired   (9,058)    
Net cash consideration 322,500 346,852    
Fair value of Ribbon stock issued $ 108,600 108,550    
Fair value of total consideration   455,402    
Fair value of assets acquired and liabilities assumed:        
Current assets, net of cash and restricted cash acquired   120,203    
Property and equipment   54,913    
Goodwill   191,996    
Other noncurrent assets   37,528    
Deferred revenue   (4,369)    
Other current liabilities   (146,618)    
Deferred revenue, net of current   (3,726)    
Deferred tax liability   (13,308)    
Other long-term liabilities   (46,117)    
Assets acquired and liabilities assumed   455,402    
ECI | In-process research and development        
Fair value of assets acquired and liabilities assumed:        
Intangible assets   34,000    
ECI | Developed technology        
Fair value of assets acquired and liabilities assumed:        
Intangible assets   111,900    
ECI | Customer relationships        
Fair value of assets acquired and liabilities assumed:        
Intangible assets   116,000    
ECI | Trade names        
Fair value of assets acquired and liabilities assumed:        
Intangible assets   $ 3,000