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STOCK-BASED COMPENSATION - Changes in Outstanding Stock Options (Details) - USD ($)
3 Months Ended 12 Months Ended
Dec. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Shares        
Balance at beginning of period (shares)   23,984,000    
Granted (shares) 0 0 0 0
Exercised (shares) (12,931,000)      
Forfeited (shares) (352,000)      
Expired (shares) (12,000)      
Balance at end of period (shares) 10,689,000 10,689,000 23,984,000  
Options exercisable (shares) 8,944,000 8,944,000    
Weighted Average Exercise Price        
Balance at beginning of period (USD per share)   $ 3.89    
Granted (USD per share) $ 0      
Exercised (USD per share) 3.18      
Forfeited (USD per share) 6.16      
Expired (USD per share) 15.03      
Balance at end of period (USD per share) 4.67 4.67 $ 3.89  
Options exercisable (USD per share) $ 4.59 $ 4.59    
Weighted Average Remaining Contractual Term (In Years)        
Balance at end of period   5 years 8 months 4 days    
Options exercisable   5 years 7 months 2 days    
Aggregate Intrinsic Value        
Balance at end of period $ 92,080.00 $ 92,080.00    
Options exercisable $ 77,970 $ 77,970