Summary of significant accounting policies (Details) ¥ in Thousands	12 Months Ended
Dec. 31, 2023 CNY (¥) segment	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)
Summary of significant accounting policies
Number of reportable segments \| segment	1
Foreign exchange losses/(gains)	¥ 11,061	¥ (13,733)	¥ 8,205
Bank acceptance notes endorsed to suppliers	143,752	192,691
Impairment of goodwill	0	0	0
Accounts and notes receivable related to marketplace service	964,587	489,777
Shipping cost	103,940	105,420	111,592
Advertising costs	34,830	18,730	50,412
Employee social security and welfare benefits	323,685	339,155	291,839
Government grants	71,503	24,330	¥ 17,832
Profit appropriation to statutory reserves	¥ 735	¥ 0

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Amount charged to advertising expense for the period, which are expenses incurred with the objective of increasing revenue for a specified brand, product or product line.

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Amount of expense for employee benefit and equity-based compensation.

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Amount, before tax, of realized and unrealized gain (loss) from foreign currency transaction.

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Amount of loss from the write-down of an asset representing the future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of government assistance recognized.

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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of accounts and notes receivable related to marketplace service.

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Amount of bank acceptance notes endorsed to suppliers.

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The amount of profit appropriation to statutory reserves.

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Amount of shipping costs incurred during the period.

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