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Share based compensation - Activities of options (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Jul. 31, 2021
$ / shares
Dec. 31, 2024
$ / shares
shares
Dec. 31, 2024
CNY (¥)
shares
Dec. 31, 2022
CNY (¥)
Weighted remaining contractual years            
Oustanding       7 years 6 months 18 days    
PSU            
Number of options            
Outstanding at the beginning (in shares) | shares          
Granted (in shares) | shares       2,000,000    
Vested (in shares) | shares       0    
Forfeited (in shares) | shares       0    
Outstanding at the end (in shares) | shares 2,000,000   2,000,000    
Vested and expected to vest (in shares) | shares         2,000,000  
Weighted Average Fair value at grant date            
Outstanding at the beginning (in USD per share)          
Granted (in USD per share)       1.69    
Vested (in USD per Share)       0    
Forfeited (in USD per share)       0    
Outstanding at the end (in USD per share) $ 1.69   1.69    
Vested and expected to vest (in USD per share) $ 1.69     $ 1.69    
2021 Option Plan            
Number of options            
Outstanding at the beginning (in shares) | shares       11,260,718    
Granted (in shares) | shares 246,724 93,904   5,821,580    
Forfeited (in shares) | shares       (950,819)    
Exercised (in shares) | shares       (196,423)    
Outstanding at the end (in shares) | shares 15,935,056 11,260,718   15,935,056    
Exercisable (in shares) | shares         11,638,041,000  
Weighted Average Exercise Price            
Outstanding at the beginning (in USD per share)       $ 9.62    
Granted (in dollars per share)     $ 9.70 0.50    
Forfeited (in USD per share)       5.40    
Exercised (in USD per share)       0.50    
Outstanding at the end (in USD per share) $ 6.65 $ 9.62   6.65    
Exercisable (in USD per share) 8.26     8.26    
Weighted Average Fair value at grant date            
Outstanding at the beginning (in USD per share)       3.11    
Granted (in USD per share)       1.24    
Forfeited (in USD per share)       1.35    
Exercised ( in USD per share)       1.19    
Outstanding at the end (in USD per share) 2.57 $ 3.11   2.57    
Exercisable (in USD per share) $ 2.70     $ 2.70    
Weighted remaining contractual years            
Exercisable       7 years 1 month 17 days    
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Exercisable, Intrinsic Value   $ 0     ¥ 982 ¥ 0