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WARRANTS AND STOCK OPTIONS - Disclosure of number and weighted average exercise prices of share options (Details)
1 Months Ended 12 Months Ended
Nov. 09, 2020
shares
Jul. 27, 2020
shares
Jun. 11, 2020
shares
Jun. 18, 2019
shares
Apr. 23, 2019
shares
Dec. 31, 2020
Share
$ / shares
Dec. 31, 2019
Share
$ / shares
Warrants And Stock Options [Abstract]              
Number of share options outstanding in share-based payment arrangement at beginning of period | Share           6,150,001 5,200,001
Weighted average exercise price of share options outstanding in share-based payment arrangement at beginning of period           $ 0.96 $ 0.98
Number of share options granted in share-based payment arrangement 200,000 1,950,000 200,000 1,675,000 400,000 2,350,000 2,075,000
Weighted average exercise price of share options granted in share-based payment arrangement           $ 1.59 $ 0.87
Number of share options exercised in share-based payment arrangement | Share           (1,133,334) (125,000)
Weighted average exercise price of share options exercised in share-based payment arrangement           $ 0.75 $ 0.58
Number of share options expired in share-based payment arrangement | Share           (100,000) (850,000)
Weighted average exercise price of share options expired in share-based payment arrangement           $ 0.67 $ 0.90
Number of share options cancelled in share based payment arrangement | Share           (100,000)  
Weighted average exercise price of share options cancelled in share based payment arrangement           $ 0.90  
Number of share options forfeited in share-based payment arrangement | Share           (66,667) (150,000)
Weighted average exercise price of share options forfeited in share-based payment arrangement           $ 1.66 $ 1.20
Number of share options outstanding in share-based payment arrangement at end of period | Share           7,075,000 6,150,001
Weighted average exercise price of share options outstanding in share-based payment arrangement at end of period           $ 1.19 $ 0.96