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Share capital - Schedule of fair value assumptions of warrants (Details) - $ / shares
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Disclosure of warrants [Line Items]      
Expected dividend yield   0.00% 0.00%
Expected life (years)     5 years
Expected volatility 96.00% 120.00%  
Bottom of range      
Disclosure of warrants [Line Items]      
Grant date share price   $ 2 $ 2.58
Exercise price   $ 1.53 $ 3.46
Risk free interest rate   0.43% 0.32%
Expected life (years)   1 year 2 months 8 days  
Expected volatility   88.00% 118.00%
Top of range      
Disclosure of warrants [Line Items]      
Grant date share price   $ 2.04 $ 4
Exercise price   $ 2.5 $ 5.8
Risk free interest rate   0.46% 0.36%
Expected life (years)   2 years  
Expected volatility   129.00% 121.00%