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Commitments and contingencies (Tables)
12 Months Ended
Dec. 31, 2016
Commitments and contingencies [Abstract]  
Schedule of future minimum payments under non-cancellable operating leases
 
 
Office rental
 
 
 
RMB
 
 
 
 
 
2017
 
 
41,848
 
2018
 
 
28,335
 
2019
 
 
1,876
 
2020 and after
 
 
444
 
 
 
 
72,503