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SHARE-BASED PAYMENTS - Number of Options and Weighted Averages of Exercise Prices (Details) | 12 Months Ended
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Dec. 31, 2020 Option $ / shares | Dec. 31, 2020 Option $ / shares | Dec. 31, 2020 Option USD ($) $ / shares | Dec. 31, 2019 Option $ / shares | Dec. 31, 2019 Option $ / shares | Dec. 31, 2019 Option USD ($) $ / shares
SHARE-BASED PAYMENTS |  |  |  |  |  |
Number of options, outstanding at beginning of year | Option | 4,050,898 |  |  | 2,936,024 |  |
Number of options, exercised | Option | (8,156) |  |  | (875) |  |
Number of options, expired and forfeited | Option | (264,939) |  |  | (69,250) |  |
Number of options, granted | 1,651,000 |  | 1,651,000 | 1,185,000 |  | 1,185,000
Number of options, outstanding at end of year | Option | 5,428,803 |  |  | 4,050,898 |  |
Number of options, exercisable at end of year | Option | 3,178,317 | 3,178,317 | 3,178,317 | 2,490,292 | 2,490,292 | 2,490,292
Weighted average of exercise price, outstanding at beginning of year |  | $ 10.30 |  |  | $ 10.50 |
Weighted average of exercise price, exercised |  | 6.38 |  |  | 6.10 |
Weighted average of exercise price, expired and forfeited |  | 9.65 |  |  | 10.30 |
Weighted average of exercise price, granted |  | 6.90 |  |  | 8.70 |
Weighted average of exercise price, outstanding at end of year |  | 9.08 |  |  | 10.30 |
Weighted average of exercise price, exercisable at end of year | $ 10.19 | $ 10.19 | $ 10.19 | $ 11.40 | $ 11.40 | $ 11.40

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