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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Summary of Property and Equipment
Property and equipment consist of the following:
 
    
As of December 31,
 
    
2020
    
2021
 
    
RMB
    
RMB
    
US$
 
At cost:
                          
Electronic equipment
     647,271        651,779        102,278  
Office equipment
     5,841        2,290        359  
Motor vehicles
     7,071        7,264        1,140  
Software
     305,552        419,326        65,801  
Leasehold improvements
     96,211        87,718        13,766  
    
 
 
    
 
 
    
 
 
 
       1,061,946        1,168,377        183,344  
Less: Accumulated depreciation
     (651,865      (786,881 )      (123,479 )
    
 
 
    
 
 
    
 
 
 
       410,081        381,496        59,865