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Inventories (Tables)
12 Months Ended
Dec. 31, 2022
Inventory Disclosure [Abstract]  
Summary of Inventories
Inventories consisted of the following:
 
    
As of December 31,
 
    
2021
    
2022
 
    
RMB
    
RMB
    
US$
 
Raw materials
     62,462        49,127        7,123  
Work in progress
     17,134        4,939        716  
Finished goods
     27,168        28,188        4,087  
    
 
 
    
 
 
    
 
 
 
Inventories, total
     106,764        82,254        11,926  
Inventories provision
     (28,689      (9,890      (1,434
    
 
 
    
 
 
    
 
 
 
    
 
78,075
 
  
 
72,364
 
  
 
10,492