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Summary of significant accounting policies - Additional information (Details) ¥ in Thousands	12 Months Ended
	Dec. 31, 2022 CNY (¥) segment	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Summary of significant accounting policies
Advertising costs	¥ 11,800	¥ 13,674	¥ 5,139
Employee social benefits expense	¥ 184,004	¥ 165,935	95,913
Number of operating segments | segment	1
VIE's
Summary of significant accounting policies
Percentage of Vat on sale of products	6.00%
Percentage of Vat on provision of services	13.00%
Employee social benefits expense			¥ 22,473

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The percentage of Vat on provision of services.

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The percentage of Vat on sale of products.

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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

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 720
-SubTopic 35
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI https://asc.fasb.org/extlink&oid=6420018&loc=d3e36677-107848

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

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 18
-URI https://asc.fasb.org/extlink&oid=126901519&loc=d3e8672-108599

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