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BUSINESS ACQUISITONS - GENBAND MERGER (Details) - USD ($)
12 Months Ended
Oct. 27, 2017
Dec. 31, 2018
Dec. 31, 2017
Business Acquisition [Line Items]      
Debt average interest rate   5.96% 4.51%
Former Sonus Networks Inc. shareholders      
Business Acquisition [Line Items]      
Percentage of ownership after transaction   50.00%  
Former GENBAND Holdings Company and two related holding companies shareholders      
Business Acquisition [Line Items]      
Sale of stock, percentage of ownership after transaction 50.00%    
GENBAND      
Business Acquisition [Line Items]      
Shares issued as consideration in connection with acquisition (in shares) 50,900,000.0   50,857,708
Repayments of long-term debt $ 47,973,000    
Payment of GENBAND management fee 10,302,000    
Promissory note issued to GENBAND equity holders $ 22,500,000.0    
Debt average interest rate 4.67%    
Weighted average life of identifiable intangible assets (in years)   8 years 3 months 18 days  
GENBAND | Line of Credit      
Business Acquisition [Line Items]      
Debt assumed as part of GENBAND merger $ 17,900,000    
GENBAND | Letter of Credit      
Business Acquisition [Line Items]      
Debt assumed as part of GENBAND merger $ 2,900,000