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Property and Equipment, Net - Schedule of Property and Equipment, Net (Details)
¥ in Thousands, $ in Thousands
Jun. 30, 2025
CNY (¥)
Jun. 30, 2025
USD ($)
Dec. 31, 2024
CNY (¥)
Jun. 30, 2024
CNY (¥)
Schedule of Property and Equipment, Net [Line Items]        
Total cost ¥ 42,821   ¥ 47,558  
Less: Accumulated depreciation (30,632)   (30,899)  
Less: Amortization of leasehold improvements (196) $ (134) (62)
Total property and Equipment, net 11,993 $ 1,674 16,597  
Machinery and equipment [Member]        
Schedule of Property and Equipment, Net [Line Items]        
Total cost 37,555   42,350  
Office equipment [Member]        
Schedule of Property and Equipment, Net [Line Items]        
Total cost 3,216   3,158  
Vehicles [Member]        
Schedule of Property and Equipment, Net [Line Items]        
Total cost 713   713  
Leasehold improvements [Member]        
Schedule of Property and Equipment, Net [Line Items]        
Total cost ¥ 1,337   ¥ 1,337