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Summary of significant accounting policies - Property and equipment and intangible assets (Details) | Dec. 31, 2024 | Jan. 31, 2024
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Software |  |
Summary of significant accounting policies |  |
Intangible assets, estimated useful life | 3 years |
Patent |  |
Summary of significant accounting policies |  |
Intangible assets, estimated useful life | 3 years |
Trademarks |  |
Summary of significant accounting policies |  |
Intangible assets, estimated useful life | 10 years |
Developed technology |  |
Summary of significant accounting policies |  |
Intangible assets, estimated useful life | 10 years | 10 years
Minimum | Distribution and licensing rights |  |
Summary of significant accounting policies |  |
Intangible assets, estimated useful life | 3 years |
Maximum | Distribution and licensing rights |  |
Summary of significant accounting policies |  |
Intangible assets, estimated useful life | 10 years |
Machinery and electronic equipment | Minimum |  |
Summary of significant accounting policies |  |
Property and equipment, estimated useful life | 3 years |
Machinery and electronic equipment | Maximum |  |
Summary of significant accounting policies |  |
Property and equipment, estimated useful life | 10 years |
Transportation vehicles |  |
Summary of significant accounting policies |  |
Property and equipment, estimated useful life | 4 years |
Office and other equipment |  |
Summary of significant accounting policies |  |
Property and equipment, estimated useful life | 5 years |

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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 842 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 7A -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478964/842-20-50-7A + Details
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- Definition Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment. + References No definition available. + Details
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