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Summary of significant accounting policies - Estimated useful lives of intangible assets (Details) | 12 Months Ended
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Dec. 31, 2021
Software | Maximum |
Finite-Lived Intangible Asset, Useful Life | 10 years
Software | Minimum |
Finite-Lived Intangible Asset, Useful Life | 5 years
Land use right |
Finite-Lived Intangible Asset, Useful Life | 50 years
Patents |
Finite-Lived Intangible Asset, Useful Life | 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_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |