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Share-based compensation - Schedule of fair value assumptions of share options granted (Details) - Stock options
12 Months Ended
Dec. 31, 2021
Year
$ / shares
Dec. 31, 2020
Year
$ / shares
Dec. 31, 2019
Year
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Expected dividend yield 0.00% 0.00% 0.00%
Expected life (years) | Year     5
Expected volatility   120.00% 100.00%
Bottom of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Grant date share price $ 1.96 $ 3.75 $ 6.45
Exercise price $ 1.70 $ 3.68 $ 7.17
Risk free interest rate 0.34% 0.27% 1.24%
Expected life (years) | Year 2 4  
Expected volatility 116.00%    
Top of range      
Disclosure of terms and conditions of share-based payment arrangement [line items]      
Grant date share price $ 2.85 $ 9.54 $ 75.38
Exercise price $ 4.25 $ 9.80 $ 75.38
Risk free interest rate 1.10% 1.55% 1.90%
Expected life (years) | Year 6 9  
Expected volatility 132.00%