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Income taxes - Schedule of reconciliation of effective income tax rate (Details) - CAD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2019
Major components of tax expense (income) [abstract]        
Loss before income taxes $ (3,536,778) $ (10,569,732) $ (9,315,372) $ (1,147,280)
Expected statutory tax rate 26.50% 26.50% 26.50% 26.50%
Expected tax recovery resulting from loss $ (937,246) $ (2,800,979) $ (2,468,574) $ (304,029)
Increase (reduction) in income taxes resulting from:        
Non-deductible expenses 275,273 563,842 654,956 28,115
Foreign operations subject to different tax rates 0 5,329 3,593  
Unrecognized temporary differences 661,973 2,182,366 1,826,279 275,914
Prior year differences 0 0 (16,254)  
Total tax expense (recovery) $ 0 $ (49,442) $ 0 $ 0