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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended
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Mar. 31, 2019 | Mar. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |
Allocated Share-based Compensation Expense | $ 1,120 | $ 1,200
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) | $ 3.84 | $ 4.48
Grants in period, weighted average exercise price (in dollars per share) | 2.92 | 1.75
Exercises in period, weighted average exercise price (in dollars per share) | 2.40 | 2.15
Forfeitures in period, weighted average exercise price (in dollars per share) | 4.78 | 3.96
Expirations in period, weighted average exercise price (in dollars per share) | 6.77 | $ 8.18
Weighted average exercise price, end of period (in dollars per share) | $ 3.32 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |
Number of options, beginning of period (in shares) | 1,732,754 | 2,028,847
Number of grants in period, net of forfeitures (in shares) | 354,844 | 442,956
Number of exercises in period (in shares) | (33,906) | (355,092)
Number of forfeitures in period (in shares) | (227,117) | (213,393)
Number of expirations in period (in shares) | (141,800) | (170,564)
Number of options, end of period (in shares) | 1,684,775 |
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 | $ 1.77
Grants in period, weighted average exercise price (in dollars per share) |  | 1.70
Exercises in period, weighted average exercise price (in dollars per share) | 1.77 | 1.70
Forfeitures in period, weighted average exercise price (in dollars per share) | 4.44 | 1.70
Expirations in period, weighted average exercise price (in dollars per share) |  | 5.86
Weighted average exercise price, end of period (in dollars per share) | 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) |  | 2.88
Exercises in period, weighted average exercise price (in dollars per share) | 2.88 | 2.55
Forfeitures in period, weighted average exercise price (in dollars per share) | 7.42 | 6.63
Expirations in period, weighted average exercise price (in dollars per share) |  | $ 10.36
Weighted average exercise price, end of period (in dollars per share) | $ 15.61 |
Equity Option |  |
Number of shares |  |
Number of nonvested shares, beginning of period (in shares) | 297,044 |
Granted, nonvested, number of shares (in shares) | 354,844 |
Vested, number of shares (in shares) | (363,016) |
Nonvested options forfeited, number of shares (in shares) | 0 |
Number of nonvested shares, end of period (in shares) | 288,872 |
Weighted Average Grant- Date Fair Value |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) | $ 1.06 |
Granted, nonvested, weighted average grant date fair value (in dollars per share) | 1.54 |
Vested, weighted average grant date fair value (in dollars per share) | 1.31 |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) | 0.00 |
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1.33 |

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