v3.26.1
Share-based Compensation - Summary of aggregate option activity (Details) - $ / shares
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2022
Number of options      
Exercised (in shares) 0 0 2,097,750
Stock options      
Number of options      
Outstanding at beginning of the year (in shares) 223,648,753    
Forfeited (in shares) (125,000)    
Outstanding at end of the year (in shares) 223,523,753 223,648,753  
Options exercisable on end of the year (in shares) 223,523,753    
Vested or expected to vest (in shares) 223,523,753    
Weighted average exercise price      
Outstanding at beginning of the year (in dollars per share) $ 0.03    
Forfeited (in dollars per share) 0.0002    
Outstanding at end of the year (in dollars per share) 0.03 $ 0.03  
Options exercisable on end of the year (in dollars per share) 0.03    
Vested or expected to vest (in dollars per share) $ 0.03    
Weighted average remaining contractual term      
Outstanding Weighted average remaining contractual term (in years) 2 years 7 days 2 years 7 months 20 days  
Options exercisable on end of the year (in years) 2 years 7 days    
Vested or expected to vest (in years) 2 years 7 days    
Weighted average grant date fair value      
Outstanding at beginning of the year (in dollars per share) $ 0.05    
Granted (in dollars per share)     $ 0.01
Forfeited (in dollars per share) 0.03    
Outstanding at end of the year (in dollars per share) 0.05 $ 0.05  
Options exercisable on end of the year (in dollars per share) 0.05    
Vested or expected to vest (in dollars per share) $ 0.05