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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ 11.66
Grants in period, weighted average exercise price (in dollars per share) | 2.34 | 2.13 | 6.02
Exercises in period, weighted average exercise price (in dollars per share) | 0.00 | 2.12 | 3.78
Forfeitures in period, weighted average exercise price (in dollars per share) | 2.93 | 5.52 | 7.29
Expirations in period, weighted average exercise price (in dollars per share) | 8.42 | 8.03 | 7.42
Weighted average exercise price, end of period (in dollars per share) | $ 4.48 | $ 5.69 | $ 6.54
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 | 905,413
Stock options granted in period (in shares) | 738,893 | 449,537 | 2,176,330
Number of exercises in period (in shares) | 0 | (8,369) | (48,802)
Number of forfeitures in period (in shares) | (316,289) | (317,960) | (574,486)
Number of expirations in period (in shares) | (438,900) | (200,962) | (335,558)
Number of options, end of period (in shares) | 2,028,847 | 2,045,143 | 2,122,897
7.60 - 44.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | $ 7.60 |  |
Upper range limit (in dollars per share) | 44.22 |  |
2.55 - 18.55 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.55 |  |
Upper range limit (in dollars per share) | 18.55 |  |
2.55 - 4.48 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.55 |  |
Upper range limit (in dollars per share) | 4.48 |  |
4.44 - 29.71 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 4.44 |  |
Upper range limit (in dollars per share) | 29.71 |  |
7.47 - 32.10 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 7.47 |  |
Upper range limit (in dollars per share) | 32.10 |  |
2.55 - 32.10 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.55 |  |
Upper range limit (in dollars per share) | 32.10 |  |
2.12 - 2.22 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.12 |  |
Upper range limit (in dollars per share) | 2.22 |  |
2.12 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.12 |  |
2.12 - 18.99 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.12 |  |
Upper range limit (in dollars per share) | 18.99 |  |
2.95 - 32.03 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.95 |  |
Upper range limit (in dollars per share) | 32.03 |  |
2.12 - 15.61 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.12 |  |
Upper range limit (in dollars per share) | 15.61 |  |
2.35 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 1.77 |  |
Upper range limit (in dollars per share) | 2.35 |  |
2.12 - 11.94 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.12 |  |
Upper range limit (in dollars per share) | 11.94 |  |
4.48 - 12.55 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 4.48 |  |
Upper range limit (in dollars per share) | 12.55 |  |
1.77 - 15.61 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 2.12 |  |
Upper range limit (in dollars per share) | $ 15.61 |  |

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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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