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Property and Equipment, Net - Summary of Plant and Equipment, Net (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2022 CNY (¥)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 CNY (¥)
Property, Plant and Equipment, Net [Abstract]
Leasehold improvements	¥ 32,634	$ 4,731	¥ 30,250
Machinery and electronic equipment	29,061	4,214	22,547
Transportation equipment	3,249	471	3,643
Office equipment	2,641	383	2,511
Construction in progress	1,885	273	1,720
Mold and tooling	2,290	332
Property,plant and equipment,gross	71,760	10,404	60,671
Less: accumulated depreciation	(23,240)	(3,369)	(25,223)
Less: accumulated impairment	(1,460)	(212)	(1,627)
Total	¥ 47,060	$ 6,823	¥ 33,821

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The aggregate amount of accumulated impairment of property plant and equipment recognized during the period.

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Amount before accumulated depreciation of property used for ground transportation

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Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount of structure or a modification to a structure under construction. Includes recently completed structures or modifications to structures that have not been placed into service.

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