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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2014
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of Prepaid Expenses and Other Current Assets

Prepaid expenses and other current assets consist of the following:

 

     December 31,  
     2013      2014  
     RMB      RMB      US$  

Rental deposits

     2,105         843         136   

Prepayments

     7,769         42,120         6,789   

Staff advances

     867         2,435         392   

Interest receivable

     1,602         12,040         1,940   

Receivables from third-party payment platform

     —           12,283         1,980   

Other receivables

     944         4,190         675   
  

 

 

    

 

 

    

 

 

 
  13,287      73,911      11,912