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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, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)	Dec. 31, 2020 CNY (¥)
Profit or loss [abstract]
Fair value loss on quoted equity securities	¥ 0	$ 0	¥ 0	¥ 1,196
Impairment loss on investment in joint venture	990	142	0	0
Loss on disposal of property, plant and equipment	0	0	0	4,183
Provision/(reversal) for onerous contract, net	(4,829)	(695)	(8,810)	13,639
Foreign exchange loss, net	555	80	1,739
Unrecoverable value added tax	0	0	11,164
Others	877	127	5,889	2,304
Other operating expenses	¥ (2,407)	$ (346)	¥ 9,982	¥ 21,322

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Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss, investment in joint venture.

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Loss on disposal of property, plant and equipment.

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

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Other operating expenses provision reversal for onerous contract net.

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Others Operating Expense

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The net loss arising from exchange differences recognised in profit or loss, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: Foreign exchange gain (loss)]

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The amount of operating income (expense) that the entity does not separately disclose in the same statement or note.

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