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CAPITAL STOCK - Disclosure of detailed information about number and weighted average exercise prices of share options (Details) | 12 Months Ended
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Dec. 31, 2020 Share $ / shares | Dec. 31, 2019 Share $ / shares
Disclosure of terms and conditions of share-based payment arrangement [abstract] |  |
Number of share options outstanding in share-based payment arrangement at beginning of period | Share | 6,714,700 | 6,775,000
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period | $ / shares | $ 1.30 | $ 1.16
Number of share options granted in share-based payment arrangement | Share | 1,645,500 | 1,740,000
Weighted average exercise price of share options granted in share-based payment arrangement | $ / shares | $ 2.62 | $ 1.71
Number of share options exercised in share-based payment arrangement | Share | (1,967,800) | (1,790,300)
Weighted average exercise price of share options exercised in share-based payment arrangement | $ / shares | $ 1.10 | $ 1.18
Number of share options forfeited in share-based payment arrangement | Share | (10,000) | (10,000)
Weighted average exercise price of share options forfeited in share-based payment arrangement | $ / shares | $ 1.70 | $ 1.45
Number of share options outstanding in share-based payment arrangement at end of period | Share | 6,382,400 | 6,714,700
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period | $ / shares | $ 1.70 | $ 1.30
Number of share options exercisable in share-based payment arrangement | Share | 6,372,400 |
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ / shares | $ 1.70 |

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