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Property and Equipment, Net (Tables)
12 Months Ended
Dec. 31, 2017
Schedule of property and equipment, net
     As of December 31,  
     2016      2017  
     RMB      RMB      US$  

Electronic equipment

     127,786        129,403        19,890  

Leasehold improvements

     62,702        62,216        9,562  

Office equipment and fixtures

     25,091        26,495        4,072  

Motor vehicles

     4,209        4,472        687  

Construction in progress

     —          2,466        379  

Less: Accumulated depreciation

     (102,349      (135,915      (20,890
  

 

 

    

 

 

    

 

 

 

Property and equipment, net

     117,439        89,137        13,700