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RELATED PARTIES (Details) - USD ($)
Dec. 31, 2018
Oct. 27, 2017
GENBAND    
Related Party Transaction [Line Items]    
Promissory note issued to GENBAND equity holders   $ 22,500,000.0
Minimum | GENBAND    
Related Party Transaction [Line Items]    
Promissory note interest rate 7.50%  
Maximum | GENBAND    
Related Party Transaction [Line Items]    
Promissory note interest rate 10.00%  
Promissory Note    
Related Party Transaction [Line Items]    
Promissory note issued to GENBAND equity holders $ 22,500,000  
Promissory note balance 24,100,000  
Interest converted to principal $ 1,600,000