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Share capital and Contributed Surplus - Schedule of number and weighted average exercise prices of share options (Details)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
share
$ / shares
shares
Sep. 30, 2022
share
$ / shares
Sep. 30, 2021
share
$ / shares
Dec. 31, 2019
share
$ / shares
Disclosure of classes of share capital [abstract]        
Options outstanding, beginning of the period | share 0 59,536 28,838  
Number of share options granted | share 29,357 9,500 52,988 0
Options from the Foremost qualifying transaction | shares 1,224      
Number of share options exercised | share (1,743)   (18,194)  
Number of share options cancelled | share   (11,928) (4,096)  
Options outstanding, end of the period | share 28,838 57,108 59,536 0
Number of share options exercisable | share 7,474 43,618    
Weighted average exercise price, beginning of the period $ 0 $ 95.9 $ 45.5  
Weighted average exercise price of share options granted 45.5 69.59 104.3  
Weighted average exercise price of share options granted from Foremost qualifying transaction 32.9      
Weighted average exercise price of share options exercised 35   50.4  
Weighted average exercise price of share options cancelled   131.76 48.3  
Weighted average exercise price, end of the period 45.5 83.87 $ 95.9 $ 0
Weighted average exercise price of share options exercisable $ 42 $ 83.9