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Share-based payments (Details) - CNY (¥)
1 Months Ended 12 Months Ended
Sep. 10, 2019
Nov. 07, 2017
Jan. 01, 2017
Sep. 30, 2020
Dec. 31, 2022
Dec. 31, 2021
Disclosure of terms and conditions of share-based payment arrangement            
Consideration recognized for shares held for share option scheme         ¥ 88,280,000 ¥ 88,280,000
Period for which the share option plan is effective   10 years        
Repurchase of shares, shares         8.02  
Repurchase of shares, value         ¥ (74,992,000)  
Shares recognized            
Disclosure of terms and conditions of share-based payment arrangement            
Shares held for share option scheme     66,171,600      
Consideration recognized for shares held for share option scheme     ¥ 88,280,000      
Percentage of options vested   100.00%        
Options vesting period   4 years        
Shares recognized | Minimum            
Disclosure of terms and conditions of share-based payment arrangement            
Option exercise period   12 months        
Shares recognized | Maximum            
Disclosure of terms and conditions of share-based payment arrangement            
Option exercise period   8 years        
Shares reserved            
Disclosure of terms and conditions of share-based payment arrangement            
Shares held for share option scheme   66,171,600        
Percentage of options vested 100.00%          
Options vesting period 4 years          
Xin Ding Heng            
Disclosure of terms and conditions of share-based payment arrangement            
Shares held for share option scheme     66,171,600 66,171,600