Other Income and Expenses Recognized in Statement of Profit and Loss - Summary of Other Operating Expenses (Detail) ¥ in Thousands, $ in Thousands	12 Months Ended
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

The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'function of expense' form for its analysis of expenses.

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