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SHARE-BASED COMPENSATION - Disclosure of share options and average life (Details) shares in Thousands, Share in Thousands | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2020 $ / shares | Dec. 31, 2020 Share | Dec. 31, 2020 shares | Dec. 31, 2019 Share | Dec. 31, 2018 Share
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price, option |  | 8,969 | 8,969 | 10,756 | 10,337
Exercise price, Average life (years) | 2 years 2 months 1 day |  |  |  |
$0.38 to $0.75 [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price, option | shares |  |  | 2,670 |  |
Exercise price, Average life (years) | 2 years 6 months 7 days |  |  |  |
$0.38 to $0.75 [Member] | Bottom of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 0.38 |  |  |  |
$0.38 to $0.75 [Member] | Top of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 0.75 |  |  |  |
$0.76 to $1.00 [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price, option | shares |  |  | 2,823 |  |
Exercise price, Average life (years) | 3 years 10 days |  |  |  |
$0.76 to $1.00 [Member] | Bottom of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 0.76 |  |  |  |
$0.76 to $1.00 [Member] | Top of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 1.00 |  |  |  |
$1.01 to $1.38 [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price, option | shares |  |  | 1,928 |  |
Exercise price, Average life (years) | 1 year 5 months 19 days |  |  |  |
$1.01 to $1.38 [Member] | Bottom of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 1.01 |  |  |  |
$1.01 to $1.38 [Member] | Top of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 1.38 |  |  |  |
$1.39 to $2.86 [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price, option | shares |  |  | 1,548 |  |
Exercise price, Average life (years) | 1 year 6 months 18 days |  |  |  |
$1.39 to $2.86 [Member] | Bottom of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 1.39 |  |  |  |
$1.39 to $2.86 [Member] | Top of range [Member] |  |  |  |  |
Disclosure of number and weighted average remaining contractual life of outstanding share options [line items] |  |  |  |  |
Exercise price | $ 2.86 |  |  |  |

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