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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options and Restricted Stock Units Activity (Details) - $ / shares
 3 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
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)     365,180 227,178 177,698
Granted, nonvested, number of shares (in shares)     442,956 738,893 449,537
Vested, number of shares (in shares)     (448,662) (486,386) (331,482)
Nonvested options forfeited, number of shares (in shares)     (62,430) (114,505) (68,575)
Number of nonvested shares, end of period (in shares) 365,180 177,698 297,044 365,180 227,178
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)     $ 1.20 $ 1.48 $ 3.44
Granted, nonvested, weighted average grant date fair value (in dollars per share)     0.96 1.18 1.29
Vested, weighted average grant date fair value (in dollars per share)     1.10 1.30 2.26
Nonvested options forfeited, weighted average grant date fair value (in dollars per share)     0.96 1.22 1.56
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 1.20 $ 3.44 $ 1.06 $ 1.20 $ 1.48
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)     1,909,477 1,330,469 272,866
Granted, nonvested, number of shares (in shares)     1,191,132 1,390,705 1,205,336
Vested, number of shares (in shares)     (1,486,126) (752,580) (138,608)
Nonvested options forfeited, number of shares (in shares)     (34,296) (59,118) (9,125)
Number of nonvested shares, end of period (in shares) 1,909,477 272,866 1,580,187 1,909,477 1,330,469
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)     $ 2.17 $ 2.37 $ 4.03
Granted, nonvested, weighted average grant date fair value (in dollars per share)     1.70 2.09 2.14
Vested, weighted average grant date fair value (in dollars per share)     2.24 2.35 4.65
Nonvested options forfeited, weighted average grant date fair value (in dollars per share)     2.00 2.29 5.39
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 2.17 $ 4.03 $ 1.99 $ 2.17 2.37
Restricted Stock Units (RSUs)          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Grant Date Intrinsic Value $ 1,490,000 $ 1,693,303     $ 300,000
Number of RSUs granted in period (in shares)     1,190,000 1,390,000 1,210,000