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Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Expenses (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 (¥)
Profit or loss [abstract] |  |  |  |
Fair value loss on quoted equity securities | ¥ 1,196 | $ 185 |  | ¥ 3,433
Fair value loss on foreign exchange forward contract |  |  | ¥ 5,529 |
Loss on disposal of property, plant and equipment | 4,183 | 646 | 645 |
Provision for onerous contract | 13,639 | 2,108 |  |
Others | 2,304 | 356 | 2,501 | 9,030
Other operating expenses | ¥ 21,322 | $ 3,295 | ¥ 8,675 | ¥ 12,463

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