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Property and equipment, net - Depreciation expenses on property and equipment allocated to expense items (Details) - CNY (¥) ¥ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Property and equipment, net |  |  |
Total depreciation | ¥ 56,791 | ¥ 53,959 | ¥ 50,527
Impairment loss | 1,039 | 7,292 | 0
Cost of revenues |  |  |
Property and equipment, net |  |  |
Total depreciation | 4,454 | 544 | 1,022
Selling, general and administrative expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | 18,599 | 29,914 | 31,931
Impairment loss | 0 | 454 | 0
Research and development expenses |  |  |
Property and equipment, net |  |  |
Total depreciation | 33,738 | 23,501 | 17,574
Impairment loss | ¥ 1,039 | ¥ 6,838 | ¥ 0

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