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SHARE-BASED PAYMENTS - Share option plan stock options outstanding (Details) - Share options Options in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2020 Options USD ($) $ / shares | Dec. 31, 2019 Options $ / shares | Dec. 31, 2018 Options $ / shares
Share options outstanding |  |  |
Exercise price range |  | $ 4.59 |
Number of options | Options | 5,601 | 10,170 | 12,344
Weighted average exercise price | $ 4.68 | $ 5.16 | $ 5.77
Weighted average remaining contractual life (years) | 2 years 9 months |  |
Share options exercisable |  |  |
Number of options | Options | 3,813 | 6,459 |
Weighted average exercise price | $ 4.68 | $ 5.38 |
Weighted average remaining contractual life (years) | 2 years 2 months 1 day |  |
Options granted | 0 | 2,042 |
$3.73 to $4.50 |  |  |
Share options outstanding |  |  |
Number of options | Options | 1,438 |  |
Weighted average exercise price | $ 3.89 |  |
Weighted average remaining contractual life (years) | 1 year 5 months 23 days |  |
Share options exercisable |  |  |
Number of options | Options | 1,438 |  |
Weighted average exercise price | $ 3.89 |  |
Weighted average remaining contractual life (years) | 1 year 5 months 23 days |  |
$4.51 to $5.00 |  |  |
Share options outstanding |  |  |
Number of options | Options | 2,794 |  |
Weighted average exercise price | $ 4.74 |  |
Weighted average remaining contractual life (years) | 3 years 10 months 24 days |  |
Share options exercisable |  |  |
Number of options | Options | 1,006 |  |
Weighted average exercise price | $ 4.82 |  |
Weighted average remaining contractual life (years) | 3 years 9 months 4 days |  |
$5.01 to $5.82 |  |  |
Share options outstanding |  |  |
Number of options | Options | 1,369 |  |
Weighted average exercise price | $ 5.39 |  |
Weighted average remaining contractual life (years) | 1 year 8 months 27 days |  |
Share options exercisable |  |  |
Number of options | Options | 1,369 |  |
Weighted average exercise price | $ 5.40 |  |
Weighted average remaining contractual life (years) | 1 year 8 months 27 days |  |
Minimum | $3.73 to $4.50 |  |  |
Share options outstanding |  |  |
Exercise price range | $ 3.73 |  |
Minimum | $4.51 to $5.00 |  |  |
Share options outstanding |  |  |
Exercise price range | 4.51 |  |
Minimum | $5.01 to $5.82 |  |  |
Share options outstanding |  |  |
Exercise price range | 5.01 |  |
Maximum | $3.73 to $4.50 |  |  |
Share options outstanding |  |  |
Exercise price range | 4.50 |  |
Maximum | $4.51 to $5.00 |  |  |
Share options outstanding |  |  |
Exercise price range | 5.00 |  |
Maximum | $5.01 to $5.82 |  |  |
Share options outstanding |  |  |
Exercise price range | $ 5.82 |  |

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