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Summary of significant accounting policies - Estimated useful lives of intangible assets (Details) | 6 Months Ended
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Jun. 30, 2022
Software | Minimum |
Estimated useful lives of the Company's intangible assets |
Intangible assets | 5 years
Software | Maximum |
Estimated useful lives of the Company's intangible assets |
Intangible assets | 10 years
Land use right |
Estimated useful lives of the Company's intangible assets |
Intangible assets | 50 years
Patents |
Estimated useful lives of the Company's intangible assets |
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 No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration

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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 No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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- Details
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- Details
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Period Type: |

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- Details
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- Details
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- Details
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Balance Type: |
Period Type: |