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REVENUE RECOGNITION - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Disaggregation of Revenue [Line Items]      
Revenue recognized $ 86.0 $ 80.0  
Customer contract expected life (in years) 5 years    
Deferred sales commissions capitalized $ 3.6   $ 3.6
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2021-01-01      
Disaggregation of Revenue [Line Items]      
Revenue to be recognized $ 7.0    
Revenue, remaining performance obligation, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2022-01-01      
Disaggregation of Revenue [Line Items]      
Revenue to be recognized $ 8.0    
Revenue, remaining performance obligation, period 1 year    
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-01-01      
Disaggregation of Revenue [Line Items]      
Revenue to be recognized $ 6.0    
Revenue, remaining performance obligation, period