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SHARE-BASED PAYMENTS - Schedule of Share-based Compensation, Stock Options, Activity (Details) - $ / shares | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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) | $ 6.54 | $ 11.66 | $ 14.27
Grants in period, weighted average exercise price (in dollars per share) | 2.13 | 6.02 | 9.05
Exercises in period, weighted average exercise price (in dollars per share) | 2.12 | 3.78 | 8.75
Forfeitures in period, weighted average exercise price (in dollars per share) | 5.52 | 7.29 | 14.70
Expirations in period, weighted average exercise price (in dollars per share) | 8.03 | 7.42 | 17.50
Weighted average exercise price, end of period (in dollars per share) | $ 5.69 | $ 6.54 | $ 11.66
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number of options, beginning of period (in shares) | 2,122,897 | 905,413 | 795,318
Stock options granted in period (in shares) | 449,537 | 2,176,330 | 307,250
Number of exercises in period (in shares) | (8,369) | (48,802) | (15,000)
Number of forfeitures in period (in shares) | (317,960) | (574,486) | (158,655)
Number of expirations in period (in shares) | (200,962) | (335,558) | (23,500)
Number of options, end of period (in shares) | 2,045,143 | 2,122,897 | 905,413
Expected volatility | 0.00% |  | 0.00%
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) | $ 2.55 | $ 7.60 | $ 7.60
Grants in period, weighted average exercise price (in dollars per share) | 2.12 | 2.55 |
Exercises in period, weighted average exercise price (in dollars per share) |  | 2.55 |
Forfeitures in period, weighted average exercise price (in dollars per share) | 2.12 | 4.44 | 7.60
Expirations in period, weighted average exercise price (in dollars per share) | 2.95 | 7.47 |
Weighted average exercise price, end of period (in dollars per share) | 2.12 | 2.55 | 7.60
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) | 32.10 | 44.22 | 44.22
Grants in period, weighted average exercise price (in dollars per share) | 2.22 | 18.55 |
Exercises in period, weighted average exercise price (in dollars per share) |  | 4.48 |
Forfeitures in period, weighted average exercise price (in dollars per share) | 18.99 | 29.71 | 44.22
Expirations in period, weighted average exercise price (in dollars per share) | 32.03 | 32.10 |
Weighted average exercise price, end of period (in dollars per share) | $ 15.61 | $ 32.10 | $ 44.22

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- Definition The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period. + 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 (f)(2)(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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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=6415400&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=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Number of options outstanding, including both vested and non-vested options. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 Reference 2: 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)-(ii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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=6415400&loc=d3e5070-113901 + Details
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- Definition Weighted average price at which option holders acquired shares when converting their stock options into shares. + References No definition available. + Details
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