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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares | 3 Months Ended | 6 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
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) |  | 0.00 | 0.00
Forfeitures in period, weighted average exercise price (in dollars per share) |  | 3.08 | 2.93
Expirations in period, weighted average exercise price (in dollars per share) |  | 10.05 | 8.42
Weighted average exercise price, end of period (in dollars per share) | $ 3.74 | $ 3.74 | $ 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) |  | 0 | 0
Number of forfeitures in period (in shares) |  | (31,610) | (316,289)
Number of expirations in period (in shares) |  | (83,264) | (438,900)
Number of options, end of period (in shares) | 2,336,929 | 2,336,929 | 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
Grants in period, weighted average exercise price (in dollars per share) |  |  | 1.77
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
Grants in period, weighted average exercise price (in dollars per share) |  |  | 2.35
Exercises in period, weighted average exercise price (in dollars per share) |  | 0.00 | 0.00
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) |  | (377,087) |
Nonvested options forfeited, number of shares (in shares) |  | (20,405) |
Number of nonvested shares, end of period (in shares) | 390,645 | 390,645 | 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) |  | 1.06 |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) |  | 0.92 |
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 Number of options or other stock instruments for which the right to exercise has lapsed under the terms of the plan agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(4) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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