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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares
 6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted average exercise price, beginning of period (in dollars per share) $ 2.91 $ 3.43
Grants in period, weighted average exercise price (in dollars per share) 3.94 1.77
Exercises in period, weighted average exercise price (in dollars per share) 2.60 1.97
Forfeitures in period, weighted average exercise price (in dollars per share) 3.16 3.26
Expirations in period, weighted average exercise price (in dollars per share) 8.14 4.40
Weighted average exercise price, end of period (in dollars per share) $ 2.97 $ 2.91
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Number of options, beginning of period (in shares) 1,609,087 1,487,433
Number of grants in period, net of forfeitures (in shares) 163,988 711,414
Number of exercises in period (in shares) (530,070) (302,707)
Number of forfeitures in period (in shares) (8,049) (188,541)
Number of expirations in period (in shares) (51,653) (98,512)
Number of options, end of period (in shares) 1,183,303 1,609,087
Minimum    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted average exercise price, beginning of period (in dollars per share) $ 1.70 $ 1.70
Grants in period, weighted average exercise price (in dollars per share) 3.89 1.76
Exercises in period, weighted average exercise price (in dollars per share) 1.70 1.70
Forfeitures in period, weighted average exercise price (in dollars per share) 1.76 1.70
Expirations in period, weighted average exercise price (in dollars per share) 1.70 4.12
Weighted average exercise price, end of period (in dollars per share) 1.70 1.70
Maximum    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Weighted average exercise price, beginning of period (in dollars per share) 15.61 15.61
Grants in period, weighted average exercise price (in dollars per share) 7.14 3.06
Exercises in period, weighted average exercise price (in dollars per share) 5.18 2.92
Forfeitures in period, weighted average exercise price (in dollars per share) 5.91 5.18
Expirations in period, weighted average exercise price (in dollars per share) 15.61 5.22
Weighted average exercise price, end of period (in dollars per share) $ 7.42 $ 15.61
Equity Option    
Number of Shares    
Number of nonvested shares, beginning of period (in shares) 403,990  
Granted, nonvested, number of shares (in shares) 163,988  
Vested, number of shares (in shares) (280,438)  
Nonvested options forfeited, number of shares (in shares) (8,049)  
Number of nonvested shares, end of period (in shares) 279,491 403,990
Weighted Average Grant Date Fair Value    
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) $ 0.94  
Granted, nonvested, weighted average grant date fair value (in dollars per share) 2.03  
Vested, weighted average grant date fair value (in dollars per share) 1.35  
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) 1.60  
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 1.15 $ 0.94