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Borrowings - Balances of long-term bank loan (Details) - CNY (¥)
¥ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Borrowings    
Outstanding loan ¥ 538,780 ¥ 82,100
Current portion according to the repayment schedule 108,320 39,840
Long-term portion 430,460 42,260
Loan Agreement with Bank of Shanghai, Maturity, December 2023    
Borrowings    
Outstanding loan   33,440
Current portion according to the repayment schedule   16,560
Long-term portion   16,880
Loan Agreement with Bank of Shanghai, Maturity, February 2024    
Borrowings    
Outstanding loan   48,660
Current portion according to the repayment schedule   23,280
Long-term portion   ¥ 25,380
Loan Agreement with Bank of Beijing, Maturity, March 2024    
Borrowings    
Outstanding loan 149,000  
Current portion according to the repayment schedule 2,000  
Long-term portion 147,000  
Loan Agreement with Bank of Shanghai, Maturity, June 2025    
Borrowings    
Outstanding loan 172,980  
Current portion according to the repayment schedule 46,320  
Long-term portion 126,660  
Loan Agreement with Hang Seng Bank, Maturity, June 2024    
Borrowings    
Outstanding loan 180,000  
Current portion according to the repayment schedule 60,000  
Long-term portion 120,000  
Loan Agreement with China Construction Bank, Maturity, July 2029, One    
Borrowings    
Outstanding loan 6,800  
Long-term portion 6,800  
Loan Agreement with Industrial and Commercial Bank of China, Maturity, July 2029    
Borrowings    
Outstanding loan 10,200  
Long-term portion 10,200  
Loan Agreement with China Construction Bank, Maturity, July 2029, Two    
Borrowings    
Outstanding loan 19,800  
Long-term portion ¥ 19,800