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Property and equipment, net - Depreciation expenses on property and equipment allocated to expense items (Details) - CNY (¥)
6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Property and equipment, net    
Total depreciation ¥ 27,274,000 ¥ 27,084,000
Impairment loss 0 0
Cost of revenues    
Property and equipment, net    
Total depreciation 539,000 375,000
Selling, general and administrative expenses    
Property and equipment, net    
Total depreciation 14,509,000 15,034,000
Research and development expenses    
Property and equipment, net    
Total depreciation ¥ 12,226,000 ¥ 11,675,000