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INCOME TAXES - Narrative (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Jun. 24, 2018
Jan. 01, 2018
Operating Loss Carryforwards [Line Items]          
Tax credit carryforward $ 32,900        
Significant change in shareholder ownership, period of change 3 years        
Significant change in shareholder ownership, benchmark percentage 50.00%        
Decrease in deferred tax assets $ (4,959) $ (9,152)      
BEAT tax expense     $ 400    
Decrease in valuation allowance 500 200      
Deferred tax assets, valuation allowance 94,980 101,484      
Potential penalties and interest 100 100 200    
Interest and penalties accrued in deferred tax liability 700 600 600    
Income tax benefit (7,182) (3,400) 18,440    
Internal Revenue Service (IRS)          
Operating Loss Carryforwards [Line Items]          
Operating loss carryforwards 224,800        
Domestic Tax Authority          
Operating Loss Carryforwards [Line Items]          
Deferred tax assets, valuation allowance 71,400 82,400      
Edgewater          
Operating Loss Carryforwards [Line Items]          
Net operating loss carryforwards acquired       $ 34,000  
Tax credit carryforwards acquired       $ 6,000  
Deferred tax assets, valuation allowance 200        
Income tax benefit   700      
GENBAND          
Operating Loss Carryforwards [Line Items]          
Deferred tax assets, valuation allowance 11,000        
Income tax benefit     $ 16,400    
IRELAND | GENBAND          
Operating Loss Carryforwards [Line Items]          
Deferred tax assets, valuation allowance 9,200 $ 9,500      
BRAZIL | GENBAND          
Operating Loss Carryforwards [Line Items]          
Deferred tax assets, valuation allowance $ 2,700        
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09          
Operating Loss Carryforwards [Line Items]          
Decrease in deferred tax assets         $ 2,200