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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2015
Commitments and contingencies [Abstract]  
Schedule of future minimum payments under non-cancellable operating leases
    Office rental  
    RMB  
       
2016     40,495  
2017     32,247  
2018     19,567  
2019 and after       1,209  
      93,518