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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, 2018 | Dec. 31, 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) | $ 4.48 | $ 5.69 | $ 6.54
Grants in period, weighted average exercise price (in dollars per share) | 1.75 | 2.34 | 2.13
Exercises in period, weighted average exercise price (in dollars per share) | 2.15 | 0.00 | 2.12
Forfeitures in period, weighted average exercise price (in dollars per share) | 3.96 | 2.93 | 5.52
Expirations in period, weighted average exercise price (in dollars per share) | 8.18 | 8.42 | 8.03
Weighted average exercise price, end of period (in dollars per share) | $ 3.84 | $ 4.48 | $ 5.69
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Number of options, beginning of period (in shares) | 2,028,847 | 2,045,143 | 2,122,897
Stock options granted in period (in shares) | 442,956 | 738,893 | 449,537
Number of exercises in period (in shares) | (355,092) | 0 | (8,369)
Number of forfeitures in period (in shares) | (213,393) | (316,289) | (317,960)
Number of expirations in period (in shares) | (170,564) | (438,900) | (200,962)
Number of options, end of period (in shares) | 1,732,754 | 2,028,847 | 2,045,143
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 |  |
1.77 - 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) | 1.77 |  |
Upper range limit (in dollars per share) | 15.61 |  |
1.70 - 2.88 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 1.70 |  |
Upper range limit (in dollars per share) | 2.88 |  |
1.70 - 2.55 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 1.70 |  |
Upper range limit (in dollars per share) | 2.55 |  |
1.70 - 6.63 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 1.70 |  |
Upper range limit (in dollars per share) | 6.63 |  |
5.86 - 10.36 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 5.86 |  |
Upper range limit (in dollars per share) | 10.36 |  |
1.70 - 15.61 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |
Lower range limit (in dollars per share) | 1.70 |  |
Upper range limit (in dollars per share) | $ 15.61 |  |

X
- 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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