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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options and Restricted Stock Units Activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Stock-option      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Number of nonvested shares, beginning of period (in shares) 223,381 297,044 365,180
Granted, nonvested, number of shares (in shares) 711,414 296,450 442,956
Vested, number of shares (in shares) (508,630) (356,626) (448,662)
Nonvested options forfeited, number of shares (in shares) (22,175) (13,487) (62,430)
Number of nonvested shares, end of period (in shares) 403,990 223,381 297,044
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) $ 1.32 $ 1.06 $ 1.20
Granted, nonvested, weighted average grant date fair value (in dollars per share) 0.82 1.54 0.96
Vested, weighted average grant date fair value (in dollars per share) 0.94 1.27 1.10
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) 0.96 1.59 0.96
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 0.94 $ 1.32 $ 1.06
RSU      
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Number of Shares [Roll Forward]      
Number of nonvested shares, beginning of period (in shares) 1,315,536 1,580,187 1,909,477
Granted, nonvested, number of shares (in shares) 740,998 731,435 1,191,132
Vested, number of shares (in shares) (746,477) (862,378) (1,486,126)
Nonvested options forfeited, number of shares (in shares) (216,001) (133,708) (34,296)
Number of nonvested shares, end of period (in shares) 1,094,056 1,315,536 1,580,187
Share-based Compensation Arrangement by Share-based Payment Award, Options, Nonvested, Weighted Average Grant Date Fair Value [Abstract]      
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) $ 2.45 $ 1.99 $ 2.17
Granted, nonvested, weighted average grant date fair value (in dollars per share) 1.65 2.91 1.70
Vested, weighted average grant date fair value (in dollars per share) 2.45 2.00 2.24
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) 2.13 2.40 2.00
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 1.98 $ 2.45 $ 1.99