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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

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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- Definition

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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