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Summary of significant accounting policies - Intangible assets, net (Details)	Dec. 31, 2023
Trademarks
Intangible assets, net
Estimated useful lives of intangible assets	10 years
Patent right
Intangible assets, net
Estimated useful lives of intangible assets	10 years
Software | Minimum
Intangible assets, net
Estimated useful lives of intangible assets	3 years
Software | Maximum
Intangible assets, net
Estimated useful lives of intangible assets	5 years
Customer relationship
Intangible assets, net
Estimated useful lives of intangible assets	10 years

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- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483154/926-20-50-5

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