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Depreciation, amortization, shipping and handling expenses - Summary of Depreciation and Amortization (Parenthetical) (Detail) ¥ in Millions	12 Months Ended
	Dec. 31, 2020 CNY (¥)
COVID - 19 [Member]
Disclosure of income statement [line items]
Rent Rebate Income	¥ 0.2

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- Definition

Disclosure of income statement [line items]

+ References

No definition available.

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- Definition

Rent rebate income.

+ References

No definition available.

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