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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 | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Allocated Share-based Compensation Expense | $ 520 | $ 830 | $ 2,240 | $ 2,617 |
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) |  |  | $ 4.48 |  |
Grants in period, weighted average exercise price (in dollars per share) | $ 1.70 |  | 1.70 |  | $ 2.34
Exercises in period, weighted average exercise price (in dollars per share) |  |  | 2.13 |  | 0.00
Forfeitures in period, weighted average exercise price (in dollars per share) |  |  | 5.09 |  | 2.93
Expirations in period, weighted average exercise price (in dollars per share) |  |  | 8.37 |  | 8.42
Weighted average exercise price, end of period (in dollars per share) | $ 3.76 |  | $ 3.76 |  | $ 4.48
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |  |
Number of options, beginning of period (in shares) |  |  | 2,028,847 |  |
Number of grants in period, net of forfeitures (in shares) |  |  | 422,956 |  | 738,893
Number of exercises in period (in shares) |  |  | (280,235) |  | 0
Number of forfeitures in period (in shares) |  |  | (130,536) |  | (316,289)
Number of expirations in period (in shares) |  |  | (170,564) |  | (438,900)
Number of options, end of period (in shares) | 1,870,468 |  | 1,870,468 |  | 2,028,847
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) |  |  | $ 1.77 | $ 2.12 | $ 2.12
Grants in period, weighted average exercise price (in dollars per share) |  |  |  |  | 1.77
Exercises in period, weighted average exercise price (in dollars per share) |  |  |  |  | 1.70
Forfeitures in period, weighted average exercise price (in dollars per share) |  |  | 2.12 |  | 2.12
Expirations in period, weighted average exercise price (in dollars per share) |  |  | 6.08 |  | 4.48
Weighted average exercise price, end of period (in dollars per share) | $ 1.70 |  | 1.70 |  | 1.77
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) |  |  |  |  | 2.35
Exercises in period, weighted average exercise price (in dollars per share) |  |  |  |  | 2.55
Forfeitures in period, weighted average exercise price (in dollars per share) |  |  | 6.87 |  | 11.94
Expirations in period, weighted average exercise price (in dollars per share) |  |  | 10.36 |  | 12.55
Weighted average exercise price, end of period (in dollars per share) | $ 15.61 |  | $ 15.61 |  | $ 15.61
Equity Option |  |  |  |  |
Number of shares |  |  |  |  |
Number of nonvested shares, beginning of period (in shares) |  |  | 365,180 |  |
Granted, nonvested, number of shares (in shares) |  |  | 422,956 |  |
Vested, number of shares (in shares) |  |  | (438,662) |  |
Nonvested options forfeited, number of shares (in shares) |  |  | (20,830) |  |
Number of nonvested shares, end of period (in shares) | 328,644 |  | 328,644 |  | 365,180
Weighted Average Grant- Date Fair Value |  |  |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) |  |  | $ 1.20 |  |
Granted, nonvested, weighted average grant date fair value (in dollars per share) |  |  | 0.91 |  |
Vested, weighted average grant date fair value (in dollars per share) |  |  | 1.07 |  |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) |  |  | 0.64 |  |
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1.04 |  | $ 1.04 |  | $ 1.20

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- Definition Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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