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Convertible Preferred Shares (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
1 Months Ended 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, 2013
shares
Dec. 31, 2014
CNY (¥)
Dec. 31, 2013
CNY (¥)
May. 28, 2014
CNY (¥)
shares
Convertible Preferred Shares                
Accretion of Series C Preference Shares | ¥           ¥ 7,957,640 ¥ 2,435,366  
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       25,247,161      
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 redeemable 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