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Other long-term liabilities - Convertible Note (Details) - CNY (¥)
¥ in Thousands
1 Months Ended 12 Months Ended
Dec. 07, 2021
Aug. 31, 2021
Dec. 31, 2021
Dec. 31, 2024
Other long-term liabilities        
Proceeds from convertible note ¥ 20,000   ¥ 20,000  
Basic interest rate       4.50%
Debt instrument term   2 years    
Unpaid interest     4.75  
If holder choose to convert in first three years        
Other long-term liabilities        
Basic interest rate     2.50%  
Debt instrument term     3 years  
If holder choose to convert in fourth or fifth year        
Other long-term liabilities        
Proceeds from convertible note     ¥ 20,000  
Percentage of proceeds from convertible note     80.00%  
Convertible debt        
Other long-term liabilities        
Principal amount     ¥ 20,000  
Basic interest rate     4.75%  
Debt instrument term     5 years