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Property and equipment - Depreciation charge (Details) - CNY (¥)
¥ in Thousands
12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Property and equipment      
Depreciation of property and equipment ¥ 51,889 ¥ 68,729 ¥ 106,118
Discontinued operations      
Property and equipment      
Depreciation of property and equipment 1,012 6,179 13,191
Continuing and Discontinued operations      
Property and equipment      
Depreciation of property and equipment 52,901 74,908 119,309
Cost of revenue      
Property and equipment      
Depreciation of property and equipment 4,030 5,567 2,743
Research and development expenses      
Property and equipment      
Depreciation of property and equipment 3,222 7,023 11,098
Selling and marketing expenses      
Property and equipment      
Depreciation of property and equipment 1,055 2,676 4,809
General and administrative expenses      
Property and equipment      
Depreciation of property and equipment ¥ 43,582 ¥ 53,463 ¥ 87,468