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Other non-current assets (Tables)
12 Months Ended
Dec. 31, 2015
Other non-current assets [Abstract]  
Schedule of other non-current assets
December 31,
2014 2015  
RMB RMB  
   
Prepayment for acquiring a land use right     -       1,860,525  
Prepayments of exclusive license fees
    31,189       69,983
 
Unamortized convertible bonds issuance cost     42,275       25,284  
Prepayment for acquiring an office building
     481,047       20,000  
Others     6,460       9,922  
                 
Total     560,971       1,985,714