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EMPLOYEE BENEFITS - Stock Based Incentive Plans (Details)
12 Months Ended
Dec. 31, 2020
plan
shares
Dec. 31, 2019
shares
Dec. 31, 2018
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of stock-based compensation plans | plan 3    
2020 Stock Option and Incentive Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 3,700,000    
2010 Inducement Stock Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized 1,845,000    
Shares issued in period 0 0 576,612
Employee Stock Purchase Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Shares issued in period 214,637    
Purchase price of common stock percent 85.00%    
Stock plan offering period 6 months    
Minimum | Employee Stock Purchase Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee subscription rate 1.00%    
Maximum | Employee Stock Purchase Plans      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Employee subscription rate 15.00%