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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, 2019 | 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) | $ 3.84 | $ 4.48 | $ 5.69 |
Grants in period, weighted average exercise price (in dollars per share) | 2.92 | 1.75 | 2.34 |
Exercises in period, weighted average exercise price (in dollars per share) | 2.27 | 2.15 | 0.00 |
Forfeitures in period, weighted average exercise price (in dollars per share) | 3.94 | 3.96 | 2.93 |
Expirations in period, weighted average exercise price (in dollars per share) | 6.97 | 8.18 | 8.42 |
Weighted average exercise price, end of period (in dollars per share) | $ 3.43 | $ 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) | 1,732,754 | 2,028,847 | 2,045,143 |
Stock options granted in period (in shares) | 296,450 | 442,956 | 738,893 |
Number of exercises in period (in shares) | (54,805) | (355,092) | 0 |
Number of forfeitures in period (in shares) | (342,866) | (213,393) | (316,289) |
Number of expirations in period (in shares) | (144,100) | (170,564) | (438,900) |
Number of options, end of period (in shares) | 1,487,433 | 1,732,754 | 2,028,847 | 2,045,143
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 |  |
2.92 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Lower range limit (in dollars per share) | $ 2.92 |  |  |
1.70 - 2.92 |  |  |  |
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) | 2.92 |  |  |
1.70 - 7.42 |  |  |  |
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) | 7.42 |  |  |
6.97 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] |  |  |  |
Lower range limit (in dollars per share) | 6.97 |  |  |
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
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