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Related party transactions and balances (Tables)
 12 Months Ended
Dec. 31, 2015
Related party transactions and balances [Abstract]  
Schedule of name of related parties and relationship with the Group
Name of related parties   Relationship with the Group
Ctrip Investment Holding Co., Ltd. (“Ctrip”)   one board director of the Group
JD.com, Inc. (“JD”)   one board director of the Group
Schedule of balance with related parties
    As of December 31,  
    2014     2015  
    RMB     RMB     US$ (Note 2(d))  
Due from Ctrip     637       59,142       9,130  
Due from JD     —       862       133  
Total     637       60,004       9,263  
                       
Due to Ctrip     —       28,669       4,426  
Due to JD     —       93       14  
Total     —       28,762       4,440