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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2017 | Dec. 31, 2016
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) |  | $ 5.69 | $ 6.54
Grants in period, weighted average exercise price (in dollars per share) | $ 2.35 | 2.34 | 2.13
Exercises in period, weighted average exercise price (in dollars per share) |  | 0.00 | 2.12
Forfeitures in period, weighted average exercise price (in dollars per share) |  | 2.93 | 5.52
Expirations in period, weighted average exercise price (in dollars per share) |  | 8.45 | 8.03
Weighted average exercise price, end of period (in dollars per share) | $ 4.49 | $ 4.49 | $ 5.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number of options, beginning of period (in shares) |  | 2,045,143 | 2,122,897
Number of grants in period, net of forfeitures (in shares) |  | 738,893 | 449,537
Number of exercises in period (in shares) |  | 0 | (8,369)
Number of forfeitures in period (in shares) |  | (316,289) | (317,960)
Number of expirations in period (in shares) |  | (438,900) | (200,962)
Number of options, end of period (in shares) | 2,028,847 | 2,028,847 | 2,045,143
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) |  | $ 2.12 | $ 2.55
Grants in period, weighted average exercise price (in dollars per share) |  |  | 2.12
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) |  | 4.48 | 2.95
Weighted average exercise price, end of period (in dollars per share) | $ 2.12 | 2.12 | 2.12
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 | 32.10
Grants in period, weighted average exercise price (in dollars per share) |  |  | 2.22
Exercises in period, weighted average exercise price (in dollars per share) |  | 0.00 | 2.12
Forfeitures in period, weighted average exercise price (in dollars per share) |  | 11.94 | 18.99
Expirations in period, weighted average exercise price (in dollars per share) |  | 12.55 | 32.03
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) |  | 227,178 |
Granted, nonvested, number of shares (in shares) |  | 738,893 |
Vested, number of shares (in shares) |  | (486,386) |
Nonvested options forfeited, number of shares (in shares) |  | (114,505) |
Number of nonvested shares, end of period (in shares) | 365,180 | 365,180 | 227,178
Weighted Average Grant- Date Fair Value |  |  |
Nonvested, weighted average grant date fair value, beginning of period (in dollars per share) |  | $ 1.48 |
Granted, nonvested, weighted average grant date fair value (in dollars per share) |  | 1.18 |
Vested, weighted average grant date fair value (in dollars per share) |  | 1.30 |
Nonvested options forfeited, weighted average grant date fair value (in dollars per share) |  | 1.22 |
Nonvested, weighted average grant date fair value, end of period (in dollars per share) | $ 1.20 | $ 1.20 | $ 1.48

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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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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under 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)(i) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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