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CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS' EQUITY/(DEFICIT) (Parenthetical) (CNY)
12 Months Ended
Dec. 31, 2014
Initial public offering  
Issuance costs 22,731,781us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_IPOMember
Private Placement  
Issuance costs 14,279,026us-gaap_PaymentsOfStockIssuanceCosts
/ us-gaap_SubsidiarySaleOfStockAxis
= us-gaap_PrivatePlacementMember