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Property and Equipment, Net
 12 Months Ended
Dec. 31, 2021
Property, Plant and Equipment [Abstract]  
Property and equipment, net
5
Property and equipment, net
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  
    
 
 
     
 
 
     
 
 
  
 
The Company recognized impairment charges on property and equipment of RMB10,952 for the year ended December 31, 2020, which was a result of the Company’s “Going-Cloud” project undertaken. No impairment loss charges were recognized on property and equipment for the years ended December 31, 2019 and 2021.
Depreciation expense recognized for the years ended December 31, 2019, 2020 and 2021 were RMB30,059, RMB37,704 and RMB27,337 (US$4,290), respectively.