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Share-based compensation expense - Schedule of Fair Value Assumptions For Options Granted (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
shares
$ / shares
Sep. 30, 2022
USD ($)
shares
$ / shares
Sep. 30, 2023
USD ($)
shares
$ / shares
Sep. 30, 2022
USD ($)
shares
$ / shares
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Award life, in years | shares   6.08   6.08
Expected dividends | $ $ 0 $ 0 $ 0 $ 0
Minimum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average share price (in USD per share) $ 0.82 $ 4.83 $ 0.82 $ 4.83
Strike price (in USD per share) $ 0.82 $ 4.83 $ 0.82 $ 4.83
Expected volatility, in % 80.00% 70.00% 75.00% 70.00%
Award life, in years | shares 6.08   6.08  
Risk-free interest rate, in % 411.00% 2.61% 3.39% 1.46%
Maximum        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Weighted average share price (in USD per share) $ 1.51 $ 8.54 $ 5.45 $ 19.69
Strike price (in USD per share) $ 1.51 $ 8.54 $ 5.45 $ 19.69
Expected volatility, in %   80.00% 80.00% 80.00%
Risk-free interest rate, in % 4.62% 3.77% 4.62% 3.77%