v3.25.2
Share-based payments - Inputs to the models used for the valuation of the share options (Details)
 12 Months Ended
Dec. 31, 2024
USD ($)
Y
$ / shares
Dec. 31, 2023
USD ($)
$ / shares
Binomial    
Disclosure Of Models Used For The Valuation Of The Share Options [Line Items]    
Weighted average fair values at the measurement date | $   $ 0.46
Expected life of share options (years) | Y 9.85  
Weighted average share price | $ / shares $ 0.13 $ 0.52
Maximum | Binomial    
Disclosure Of Models Used For The Valuation Of The Share Options [Line Items]    
Expected volatility (%) 67.66%  
Risk-free interest rate (%) 4.59%  
Maximum | Monte Carlo    
Disclosure Of Models Used For The Valuation Of The Share Options [Line Items]    
Expected volatility (%) 73.45%  
Risk-free interest rate (%) 4.48%  
Bottom of range | Binomial    
Disclosure Of Models Used For The Valuation Of The Share Options [Line Items]    
Expected volatility (%) 66.48%  
Risk-free interest rate (%) 3.48%  
Bottom of range | Monte Carlo    
Disclosure Of Models Used For The Valuation Of The Share Options [Line Items]    
Weighted average fair values at the measurement date | $ $ 0.01  
Expected volatility (%) 71.93%  
Risk-free interest rate (%) 3.74%  
Expected life of share options (years) | Y 9.88