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Summary of significant accounting policies - Significant property and equipment (Details)	6 Months Ended
	Jun. 30, 2022
Buildings
Estimated useful lives for significant property and equipment
Plant and equipment useful life	20 years
Machinery and equipment | Minimum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	5 years
Machinery and equipment | Maximum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	10 years
Transportation equipment | Minimum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	4 years
Transportation equipment | Maximum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	5 years
Office equipment | Minimum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	4 years
Office equipment | Maximum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	5 years
Electronic equipment | Minimum
Estimated useful lives for significant property and equipment
Plant and equipment useful life	3 years
Electronic equipment | Maximum
Estimated useful lives for significant property and equipment
Plant and equipment 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

No definition available.

+ 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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