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Inventories, Net (Tables)
12 Months Ended
Dec. 31, 2024
Inventory, Work in Process and Raw Materials [Abstract]  
Summary of Inventories
    
As of December 31,
 
    
2023
    
2024
 
    
RMB
    
RMB
    
US$
 
Raw materials
     42,703        32,827        4,497  
Work in progress
     5,258        6,617        907  
Finished goods
     21,059        14,319        1,962  
Contract cost
     —         8,862        1,214  
  
 
 
    
 
 
    
 
 
 
    
69,020
    
62,625
    
8,580