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Acquisitions and disposals - Asset acquisitions (Details) - Puluo - CNY (¥) ¥ in Thousands	1 Months Ended	12 Months Ended
	Aug. 31, 2020	Dec. 31, 2021
Asset Acquisition [Line Items]
Ownership interest percentage acquired	100.00%
Gross consideration of asset acquired	¥ 2,063
Consideration prepaid	¥ 1,500
Total assets acquired		¥ 3,806
Deferred tax liabilities		(927)
Accrued expenses and other current liabilities		(816)
Total liabilities assumed		(1,743)
Net assets acquired		2,063
Medical institution license
Asset Acquisition [Line Items]
Total assets acquired		3,708
Trademark and software copyright
Asset Acquisition [Line Items]
Total assets acquired		¥ 98

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- Definition

Amount of consideration transferred in asset acquisition. Includes, but is not limited to, cash, liability incurred by acquirer, and equity interest issued by acquirer.

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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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- Definition

The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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Amount of prepaid consideration in asset acquisition.

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Percentage of ownership interests acquired in the asset acquisition.

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Amount of other liabilities due after one year or the normal operating cycle, if longer, assumed at the acquisition date.

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Amount of deferred tax liability attributable to taxable temporary differences assumed at the acquisition date.

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The amount of identifiable intangible assets recognized as of the acquisition date.

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Amount of liabilities assumed at the acquisition date.

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