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SHARE-BASED COMPENSATION - Disclosure of changes in number of share options and average price (Details) shares in Thousands, Share in Thousands | 12 Months Ended
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Dec. 31, 2020 Share $ / shares | Dec. 31, 2020 Share $ / shares | Dec. 31, 2020 Share shares $ / shares | Dec. 31, 2019 Share $ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |  |  |
Outstanding , beginning balance | Share |  | 10,756 |  | 10,337
Granted | Share |  | 1,835 |  | 4,612
Exercised | Share |  | (1,599) |  | (463)
Cancelled/forfeited | Share |  | (74) |  | (178)
Expired | Share |  | (1,949) |  | (3,552)
Outstanding, ending balance |  | 8,969 | 8,969 | 10,756
Options, Exercisable | Share | 6,365 | 6,365 | 6,365 |
Average price, Outstanding beginning balance | $ 1.12 |  |  | $ 1.64
Granted | 0.85 |  |  | 0.75
Exercised | 0.53 |  |  | 0.38
Cancelled/forfeited | 1.31 |  |  | 1.58
Expired | 1.02 |  |  | 2.23
Average price, Outstanding ending balance | 1.19 |  |  | $ 1.12
Average price, Exercisable | $ 1.35 | $ 1.35 | $ 1.35 |

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