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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

X

- Definition

The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation.

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The aggregate amount of write-downs for impairments recognized during the period for long-lived assets held for abandonment, exchange or sale.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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