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Depreciation, amortization, shipping and handling expenses - Summary of Depreciation and Amortization (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 CNY (¥) | Dec. 31, 2021 USD ($) | Dec. 31, 2020 CNY (¥) | Dec. 31, 2019 CNY (¥)
Disclosure of income statement [line items] |  |  |  |  |  |
Amortization of intangible assets | ¥ 38,957 | $ 6,162 | ¥ 1,012 |  | ¥ 1,012 |
Depreciation of investment property | 355 | 56 | 376 |  | 380 |
Depreciation of property, plant and equipment | 492,826 | 77,952 | 450,092 |  | 422,859 |
Depreciation of right-of-use assets | 41,458 | 6,558 | 43,127 | [1] | 40,958 | [1]
Depreciation and amortization expenses | 573,596 | 90,728 | 494,607 |  | 465,209 |
Cost of sales [member] |  |  |  |  |  |
Disclosure of income statement [line items] |  |  |  |  |  |
Depreciation and amortization expenses | 381,248 | 60,303 | 327,866 |  | 315,445 |
Research and development expenses [Member] |  |  |  |  |  |
Disclosure of income statement [line items] |  |  |  |  |  |
Depreciation and amortization expenses | 41,835 | 6,618 | 26,815 |  | 16,470 |
Selling general and administrative expenses [member] |  |  |  |  |  |
Disclosure of income statement [line items] |  |  |  |  |  |
Depreciation and amortization expenses | ¥ 150,513 | $ 23,807 | ¥ 139,926 |  | ¥ 133,294 |
[1] | In 2020, COVID-19 related rent rebate received from lessors of RMB 0.2 million has been offset against the depreciation of right-of-use assets.

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- Definition The amount of depreciation and amortisation expense. Depreciation and amortisation are the systematic allocations of depreciable amounts of assets over their useful lives. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 23 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_23_e&doctype=Standard -URIDate 2021-03-24 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 8 -IssueDate 2021-01-01 -Paragraph 28 -Subparagraph e -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=8&code=ifrs-tx-2021-en-r&anchor=para_28_e&doctype=Standard -URIDate 2021-03-24 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 12 -IssueDate 2021-01-01 -Paragraph B13 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=12&code=ifrs-tx-2021-en-r&anchor=para_B13_d&doctype=Appendix&subtype=B -URIDate 2021-03-24 Reference 4: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_102&doctype=Standard -URIDate 2021-03-24 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_99&doctype=Standard -URIDate 2021-03-24 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2021-01-01 -Paragraph 104 -URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2021-en-r&anchor=para_104&doctype=Standard -URIDate 2021-03-24 + Details
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