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Depreciation, amortization, shipping and handling expenses - Summary of Other Operating Expenses (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021 CNY (¥)	Dec. 31, 2021 USD ($)	Dec. 31, 2020 CNY (¥)	Dec. 31, 2019 CNY (¥)
Profit or loss [abstract]
Fair value loss on quoted equity securities	¥ 0	$ 0	¥ 1,196
Fair value loss on foreign exchange forward contract	0	0		¥ 5,529
Loss on disposal of property, plant and equipment	0	0	4,183	645
Provision/(reversal) for onerous contract, net	(8,810)	(1,394)	13,639
Realised foreign exchange loss, net	(1,532)	(242)
Unrealised foreign exchange loss, net	3,271	518
Unrecoverable value added tax	11,164	1,766
Others	5,889	931	2,304	2,501
Other operating expenses	¥ 9,982	$ 1,579	¥ 21,322	¥ 8,675

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- Definition

Losses on financial assets at fair value through profit or loss classified as quoted equity securities

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Other operating expenses realised foreign exchange loss net.

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- Definition

Unrecoverable value added tax.

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The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'function of expense' form for its analysis of expenses.

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