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Leases - Lease cost allocated expense items (Details) - CNY (¥)
¥ in Thousands
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Leases    
Total ¥ 26,818 ¥ 24,514
Selling, general and administrative expenses    
Leases    
Total 14,838 12,968
Research and development expenses    
Leases    
Total ¥ 11,980 ¥ 11,546