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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Share-Based Compensation (Details)
12 Months Ended
Dec. 31, 2019
Dec. 31, 2017
Market Performance Based Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 10 years  
Vesting period 4 years  
Vesting price hurdle, percent of premium to closing stock price on grant date   25.00%
Number of consecutive trading days 30 days  
Market Performance Based Options | Tranche 1    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 25.00%  
Market Performance Based Options | Tranche 2    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 25.00%  
Market Performance Based Options | Tranche 3    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 25.00%  
Market Performance Based Options | Tranche 4    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Vesting percentage 25.00%  
Stock Options    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiration period 10 years