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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Property and equipment consist of the following:
 
     As of December 31,  
     2020      2021  
     RMB      RMB      US$  
Office furniture and
equipment
     4,414        4,744        744  
Computer equipment and servers
     162,587        163,392        25,640  
Leasehold improvements
     100        5,451        855  
Construction-in
progress
     2,840        85        13  
Less: Accumulated depreciation and impairment
     (96,419      (111,493      (17,495
    
 
 
    
 
 
    
 
 
 
Total property and equipment, net
     73,522        62,179        9,757