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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2022
Property, Plant and Equipment [Abstract]  
Schedule of Property and Equipment
Property and equipment consist of the following:
 
     As of December 31,  
     2021      2022  
     RMB      RMB      US$  
Office furniture and equipment
     4,744        5,008        726  
Computer equipment and servers
     163,392        163,366        23,686  
Leasehold improvements
     5,451        4,313        625  
Construction-in
 
progress
     85        85        12  
Less: Accumulated depreciation and impairment
     (111,493      (157,825      (22,882
    
 
 
    
 
 
    
 
 
 
Total property and equipment, net
     62,179        14,947        2,167