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Related party transactions (Details) ¥ in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016 CNY (¥)	Dec. 31, 2015 CNY (¥)	Dec. 31, 2014 CNY (¥)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Revenue generated	¥ 3,606	¥ 7,850	¥ 622
Amount due from related parties	38,772	37,565		$ 5,584
Amount due to related parties	0	¥ 7,469		$ 0
Acquisition percentage		100.00%
Alibaba Group Holding Limited [Member]
Related Party Transaction [Line Items]
Fees paid		¥ 69,000
Amount due from related parties	10,392	18,702
Alibaba Group Holding Limited [Member] | Marketing and Platform Service [Member]
Related Party Transaction [Line Items]
Fees paid	246,136	141,412	69,072
Alibaba Group Holding Limited [Member] | Logistic Service [Member]
Related Party Transaction [Line Items]
Fees paid		2,059	1,603
Ahead (Shanghai) Trade Co., Ltd [Member]
Related Party Transaction [Line Items]
Fees paid	4,285	1,134	484
Revenue generated	3,606	7,850	¥ 622
Amount due from related parties	28,380	18,863
Ahead (Shanghai) Trade Co., Ltd [Member] | Services Provided [Member]
Related Party Transaction [Line Items]
Amount due from related parties	27,944	15,951
Investors and Founding Shareholders [Member]
Related Party Transaction [Line Items]
Amount due to related parties		7,469
Amount of transaction		61,472
Founding Shareholders [Member]
Related Party Transaction [Line Items]
Amount of transaction		20,963
Investors [Member]
Related Party Transaction [Line Items]
Amount of transaction		47,978
Ahead on behalf of the Group [Member]
Related Party Transaction [Line Items]
Amount due from related parties	¥ 436	¥ 2,912

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Carrying amount as of the balance sheet date of obligations due all related parties. For classified balance sheets, represents the current portion of such liabilities (due within one year or within the normal operating cycle if longer).

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