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Share repurchase program (Details)
$ / shares in Units, ¥ in Millions, $ in Millions
12 Months Ended 36 Months Ended
Dec. 31, 2021
USD ($)
$ / shares
shares
Dec. 31, 2021
CNY (¥)
shares
Dec. 31, 2020
USD ($)
$ / shares
shares
Dec. 31, 2020
CNY (¥)
shares
Dec. 31, 2024
shares
Oct. 03, 2024
Oct. 02, 2024
May 06, 2020
shares
Share repurchase program                
Number of shares repurchased 6,646,700 6,646,700 12,996,125 12,996,125 0      
Treasury shares exercised         19,027,882      
Treasury shares repurchase program         614,943      
ADS                
Share repurchase program                
Number of shares authorized to repurchase               1,000,000
Number of shares repurchased 265,868 265,868 519,845 519,845        
Payments for repurchase of shares $ 0.9 ¥ 5.8 $ 1.7 ¥ 11.7        
Weighted average price | $ / shares $ 3.3   $ 3.3          
Class A Ordinary Shares                
Share repurchase program                
Ratio of ADSs to Class A ordinary shares           500 25 25