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STOCK BASED COMPENSATION - Narrative (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate unamortized outstanding stock based compensation $ 31.1 $ 23.8
Stock options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period (in years) 10 years  
2013 Omnibus Equity Award Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Aggregate common stock available for future grants (in shares) 5,414,796