Property And Equipment, Net - Summary of Property And Equipment Consist of The Following (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	¥ 521,369	$ 74,553	¥ 528,525
Accumulated depreciation	(457,973)	(65,488)	(448,194)
Accumulated impairment	(32,297)	(4,618)	(33,179)
Total	31,099	4,447	47,152
Machinery And Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	273,051	39,045	272,231
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,572	224	1,572
Furniture And Tools [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,189	2,029	14,660
Electronic Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	44,895	6,420	52,203
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	187,028	26,744	187,225
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	¥ 634	$ 91	¥ 634

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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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