Property and Equipment, Net (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Property, Plant and Equipment [Line Items]
Less: Accumulated depreciation	¥ (107,676)	$ (15,397)	¥ (126,088)
Less: Accumulated impairment	(7,188)	(1,028)	(7,188)
Property and equipment, net	40,238	5,754	51,564
Electronic equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	51,181	7,319	56,296
AI related equipment
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	50,002	7,150	75,173
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	29,281	4,187	27,382
Office equipment and fixtures
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	7,543	1,079	13,053
Mold and tooling
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	14,555	2,081	11,192
Motor vehicles [Member]
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	2,136	305	¥ 1,744
Construction in progress
Property, Plant and Equipment [Line Items]
Property plant and equipment, gross	¥ 404	$ 58

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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 before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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