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v3.21.1

Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Depreciation and Amortization (Detail) ¥ in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2020 CNY (¥) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 CNY (¥) | Dec. 31, 2018 CNY (¥)
Disclosure of income statement [line items] |  |  |  |  |  |
Amortization of intangible assets | ¥ 1,012 |  | $ 156 |  | ¥ 1,012 |
Amortization of prepaid operating lease |  |  |  |  |  | ¥ 12,724
Depreciation of investment property | 376 |  | 58 |  | 380 | 884
Depreciation of property, plant and equipment | 450,092 |  | 69,552 |  | 422,859 | 420,277
Depreciation of right-of-use assets | 43,127 | [1] | 6,664 | [1] | 40,958 |
Depreciation and amortization expenses | 494,607 |  | 76,430 |  | 465,209 | 433,885
Cost of sales [member] |  |  |  |  |  |
Disclosure of income statement [line items] |  |  |  |  |  |
Depreciation and amortization expenses | 327,866 |  | 50,664 |  | 315,445 | 312,769
Research and development expenses [Member] |  |  |  |  |  |
Disclosure of income statement [line items] |  |  |  |  |  |
Depreciation and amortization expenses | 26,815 |  | 4,144 |  | 16,470 | 26,751
Selling general and administrative expenses [member] |  |  |  |  |  |
Disclosure of income statement [line items] |  |  |  |  |  |
Depreciation and amortization expenses | ¥ 139,926 |  | $ 21,622 |  | ¥ 133,294 | ¥ 94,365
[1] | In 2020, COVID-19 related rent rebate received from lessors of RMB 0.2 million (less than US$ 0.1 million) has been offset against the depreciation of right-of-use assets.

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