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Other operating expenses - Summary of Other Operating Expenses (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 CNY (¥)	Dec. 31, 2021 CNY (¥)
Profit or loss [abstract]
Impairment loss on investment in joint venture	¥ 0	$ 0	¥ 990	¥ 0
Impairment on property, plant and equipment	36,720	5,169	0	0
Reversal of provision for onerous contract, net	0	0	(4,829)	(8,810)
Foreign exchange loss, net	482	68	555	1,739
Written off/(write-back) of unrecoverable value-added tax	(11,164)	(1,572)	0	11,164
Others	900	127	877	5,889
Other operating expenses	¥ 26,938	$ 3,792	¥ (2,407)	¥ 9,982

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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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Other operating expenses reversal of provision for onerous contract net. .

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Others Operating Expense

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Adjustments for impairment loss (reversal of impairment loss) on property, plant and equipment recognised in profit or loss to reconcile profit (loss) to net cash flow from (used in) operating activities. [Refer: Adjustments for impairment loss (reversal of impairment loss) recognised in profit or loss; Property, plant and equipment]

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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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