v3.26.1
Share-based compensation - Restricted stocks unit (Details)
1 Months Ended 4 Months Ended 12 Months Ended
Oct. 31, 2025
shares
Nov. 30, 2021
shares
Nov. 30, 2019
CNY (¥)
shares
Nov. 30, 2019
USD ($)
shares
Aug. 31, 2019
CNY (¥)
shares
Aug. 31, 2019
USD ($)
shares
Nov. 30, 2019
shares
Dec. 31, 2025
¥ / shares
shares
Dec. 31, 2024
¥ / shares
shares
Dec. 31, 2023
shares
Dec. 31, 2022
shares
Dec. 31, 2021
shares
Dec. 31, 2020
shares
Dec. 31, 2019
shares
Share-based compensation                            
Expiration term               10 years            
Minimum                            
Share-based compensation                            
Vesting term               3 years            
Maximum                            
Share-based compensation                            
Vesting term               4 years            
Restricted stock units                            
Share-based compensation                            
Expiration term                           10 years
Vesting term               3 years            
Incremental compensation expenses     ¥ 360,592 $ 52,281 ¥ 360,592 $ 52,281                
Unrecognized compensation expense 1,683,606             1,683,606            
Number of Restricted Shares                            
Outstanding opening balance (in shares)               13,375,270            
Granted (in shares)   26,657,998           3,847,044 7,210,000 180,000 35,230,698 35,230,698 35,230,698 35,230,698
Vested (in shares)               (7,486,266)            
Forfeited (in shares)               (63,256)            
Cancelled (in shares) (1,683,606)             (1,683,606)            
Outstanding ending balance (in shares)               7,989,186 13,375,270          
Weighted-Average Grant-Date Fair Value                            
Outstanding opening balance (in dollars per share) | ¥ / shares               ¥ 4.94            
Granted (in dollars per share) | ¥ / shares               11.2            
Vested (in dollars per share) | ¥ / shares               5.97            
Forfeited (in dollars per share) | ¥ / shares               4.97            
Cancelled (in dollars per share) | ¥ / shares               6.78            
Outstanding ending balance (in dollars per share) | ¥ / shares               ¥ 6.6 ¥ 4.94          
Restricted stock units | Minimum                            
Share-based compensation                            
Vesting term                           2 years
Restricted stock units | Maximum                            
Share-based compensation                            
Vesting term                           4 years
Restricted stock units | Certain senior managements                            
Share-based compensation                            
Stock options cancelled (in shares)     1,750,000 1,750,000 1,750,000 1,750,000                
Number of Restricted Shares                            
Granted (in shares)             1,750,000