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Property And Equipment, Net - Summary of Property And Equipment Consist of The Following (Detail) ¥ in Thousands, $ in Thousands	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	¥ 528,525	$ 72,407	¥ 536,010
Accumulated depreciation	(448,194)	(61,401)	(404,098)
Accumulated impairment	(33,179)	(4,546)	0
Property, Plant and Equipment, Net	47,152	6,460	131,912
Machinery And Laboratory Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	272,231	37,295	275,209
Vehicles [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	1,572	215	2,229
Furniture And Tools [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,660	2,008	18,192
Electronic Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	52,203	7,152	52,442
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	187,225	25,650	187,390
Construction In Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	¥ 634	$ 87	¥ 548

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