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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