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CAPITAL STOCK - Disclosure of number and weighted average exercise prices of share options (Details)
 12 Months Ended
Dec. 31, 2019
CAD ($)
Share
Dec. 31, 2018
CAD ($)
Share
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 6,775,000 5,247,500
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period | $ $ 1.16 $ 1.10
Number of share options granted in share-based payment arrangement | Share 1,740,000 1,810,000
Weighted average exercise price of share options granted in share-based payment arrangement | $ $ 1.71 $ 1.32
Number of share options exercised in share-based payment arrangement | Share (1,790,300) (192,500)
Weighted average exercise price of share options exercised in share-based payment arrangement | $ $ 1.18 $ 0.97
Number of share options forfeited in share-based payment arrangement | Share (10,000) (90,000)
Weighted average exercise price of share options forfeited in share-based payment arrangement | $ $ 1.45 $ 1.11
Number of share options outstanding in share-based payment arrangement at end of period | Share 6,714,700 6,775,000
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period | $ $ 1.3 $ 1.16
Number of share options exercisable in share-based payment arrangement | Share 6,697,200  
Weighted average exercise price of share options exercisable in share-based payment arrangement | $ $ 1.3