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Convertible preferred shares (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
12 Months Ended
Sep. 21, 2010
USD ($)
$ / shares
shares
Jan. 12, 2009
USD ($)
$ / shares
shares
Aug. 15, 2007
USD ($)
$ / shares
shares
Mar. 27, 2007
USD ($)
$ / shares
shares
Dec. 31, 2014
CNY (¥)
May 28, 2014
CNY (¥)
shares
Convertible preferred shares            
Accretion of Series C Preference Shares | ¥         ¥ 7,957,640  
Series A convertible redeemable preferred shares            
Convertible preferred shares            
Shares Issued       155,000,000    
Issue Price per Share (in dollars per share) | $ / shares       $ 0.0323    
Proceeds from Issuance, convertible preferred shares | $       $ 5,000    
Preferred shares, shares Outstanding           155,000,000
Preferred shares, carrying Amount | ¥           ¥ 215,626
Series A-1 convertible preferred shares            
Convertible preferred shares            
Shares Issued     130,940,000      
Issue Price per Share (in dollars per share) | $ / shares     $ 0.0382      
Proceeds from Issuance, convertible preferred shares | $     $ 5,000      
Preferred shares, shares Outstanding           36,894,000
Preferred shares, carrying Amount | ¥           ¥ 40,224
Conversion of preferred shares to ordinary shares (in shares) 64,579,075          
Series B convertible preferred shares            
Convertible preferred shares            
Shares Issued   235,310,000        
Issue Price per Share (in dollars per share) | $ / shares   $ 0.0892        
Proceeds from Issuance, convertible preferred shares | $   $ 21,000        
Preferred shares, shares Outstanding           59,539,244
Preferred shares, carrying Amount | ¥           ¥ 88,241
Conversion of preferred shares to ordinary shares (in shares) 15,498,980          
Series C Preferred Shares            
Convertible preferred shares            
Shares Issued 178,238,250          
Issue Price per Share (in dollars per share) | $ / shares $ 0.7742          
Proceeds from Issuance, convertible preferred shares | $ $ 138,000          
Convertible redeemable preferred shares, shares Outstanding           258,316,305
Convertible redeemable preferred shares, carrying Amount | ¥           ¥ 15,130,903
Accretion of Series C Preference Shares | ¥         ¥ 7,957,640