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Short-term deposits (Tables)
12 Months Ended
Dec. 31, 2015
Short-term deposits [Abstract]  
Schedule of short-term deposits
   
December 31, 2014 December 31, 2015  
Amount RMB
 equivalent
    Amount     RMB
 equivalent
 
               
RMB     1,921,520       1,921,520       250,000       250,000  
US$     374,685       2,293,056       253,322       1,644,946  
Total             4,214,576               1,894,946