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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
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) $ 3.43 $ 3.84 $ 4.48
Grants in period, weighted average exercise price (in dollars per share) 1.77 2.92 1.75
Exercises in period, weighted average exercise price (in dollars per share) 1.97 2.27 2.15
Forfeitures in period, weighted average exercise price (in dollars per share) 3.26 3.94 3.96
Expirations in period, weighted average exercise price (in dollars per share) 4.40 6.97 8.18
Weighted average exercise price, end of period (in dollars per share) $ 2.91 $ 3.43 $ 3.84
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]      
Number of options, beginning of period (in shares) 1,487,433 1,732,754 2,028,847
Stock options granted in period (in shares) 711,414 296,450 442,956
Number of exercises in period (in shares) (302,707) (54,805) (355,092)
Number of forfeitures in period (in shares) (188,541) (342,866) (213,393)
Number of expirations in period (in shares) (98,512) (144,100) (170,564)
Number of options, end of period (in shares) 1,609,087 1,487,433 1,732,754
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 $ 1.77
Grants in period, weighted average exercise price (in dollars per share) 1.76   1.70
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) 1.70 1.70 1.70
Expirations in period, weighted average exercise price (in dollars per share) 4.12   5.86
Weighted average exercise price, end of period (in dollars per share) 1.70 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 15.61
Grants in period, weighted average exercise price (in dollars per share) 3.06   2.88
Exercises in period, weighted average exercise price (in dollars per share)   2.92 2.55
Forfeitures in period, weighted average exercise price (in dollars per share) 5.18 7.42 6.63
Expirations in period, weighted average exercise price (in dollars per share) 5.22   10.36
Weighted average exercise price, end of period (in dollars per share) $ 15.61 $ 15.61 $ 15.61