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Intangible assets, Net (Details)
¥ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2016
CNY (¥)
Dec. 31, 2015
CNY (¥)
Dec. 31, 2014
CNY (¥)
Dec. 31, 2016
USD ($)
Finite-Lived Intangible Assets [Line Items]        
Accumulated amortization ¥ (23,402) ¥ (14,181)    
Intangible assets, net 26,984 20,128   $ 3,887
Amortization expenses 9,221 6,532 ¥ 4,542  
Estimated amortization expenses of the existing intangible assets for the next five years        
2017 12,106      
2018 9,012      
2019 5,353      
2020 86      
2021 83      
Internally developed software [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets 49,426 33,624    
Trademark [Member]        
Finite-Lived Intangible Assets [Line Items]        
Intangible assets ¥ 960 ¥ 685