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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, 2023
Disclosure of terms and conditions of share-based payment arrangement            
Shares available for award grant purpose         35,099,420  
Shares issued under incentive scheme         101,271,020  
Period for which the share option plan is effective   10 years        
Repurchase of shares, shares         8,020,000.00  
Repurchase of shares, value         ¥ (74,992,000)  
Adr            
Disclosure of terms and conditions of share-based payment arrangement            
Repurchase of shares, shares         24,070,000.00  
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     ¥ 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   10 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