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Other operating expenses - Summary of Other Operating Expenses (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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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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- Definition 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)] + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 21 -IssueDate 2023-01-01 -Paragraph 52 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=21&code=ifrs-tx-2023-en-r&anchor=para_52_a&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2023-01-01 -Paragraph 35 -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2023-en-r&anchor=para_35&doctype=Standard -URIDate 2023-03-23 + Details
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