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Inventories (Tables)
12 Months Ended
Dec. 31, 2021
Inventory Disclosure [Abstract]  
Schedule of Inventory, Current
The Company’s inventories consist primarily of finished goods, which consists of products to be sold to customers, and packing materials as follows: 
 
    
As of December 31,
 
    
2020
    
2021
    
2021
 
    
RMB
    
RMB
    
US$
 
    
(in thousands)
 
Products
     329,065        487,066        76,431  
Packing materials and others
     57,366        50,406        7,910  
    
 
 
    
 
 
    
 
 
 
Total
  
 
386,431
 
  
 
537,472
 
  
 
84,341