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, 2019 CNY (¥)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 CNY (¥)	Dec. 31, 2017 CNY (¥)
Profit or loss [abstract]
Fair value loss on quoted equity securities			¥ 3,433
Fair value loss on foreign exchange forward contract	¥ 5,529	$ 780
Loss on disposal of property, plant and equipment	645	91
Others	2,501	353	9,030	¥ 22,719
Other operating expenses	¥ 8,675	$ 1,224	¥ 12,463	¥ 22,719

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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