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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, 2017
Dec. 31, 2016
Dec. 31, 2015
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) 227,178 177,698 139,600
Granted, nonvested, number of shares (in shares) 738,893 449,537 2,176,330
Vested, number of shares (in shares) (486,386) (331,482) (2,119,803)
Nonvested options forfeited, number of shares (in shares) (114,505) (68,575) (18,429)
Number of nonvested shares, end of period (in shares) 365,180 227,178 177,698
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) $ 1.48 $ 3.44 $ 5.27
Granted, nonvested, weighted average grant date fair value (in dollars per share) 1.18 1.29 1.93
Vested, weighted average grant date fair value (in dollars per share) 1.30 2.26 2.00
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) 1.22 1.56 5.17
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 1.20 $ 1.48 $ 3.44
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) 1,330,469 272,866 0
Granted, nonvested, number of shares (in shares) 1,390,705 1,205,336 282,716
Vested, number of shares (in shares) (752,580) (138,608) 0
Nonvested options forfeited, number of shares (in shares) (59,118) (9,125) (9,850)
Number of nonvested shares, end of period (in shares) 1,909,477 1,330,469 272,866
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) $ 2.37 $ 4.03 $ 0.00
Granted, nonvested, weighted average grant date fair value (in dollars per share) 2.09 2.14 4.05
Vested, weighted average grant date fair value (in dollars per share) 2.35 4.65 0.00
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) 2.29 5.39 4.68
Nonvested, weighted average grant date fair value, end of period (in dollars per share) $ 2.17 $ 2.37 $ 4.03
Restricted Stock Units (RSUs)      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of RSUs granted in period (in shares) 1,390,000 1,210,000 280,000