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REVENUE (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended 1 Months Ended 0 Months Ended
Dec. 31, 2013
Dec. 31, 2012
May 31, 1995
May 31, 2005
REVENUE        
Product royalty expense $ 2,334us-gaap_RoyaltyExpense $ 10,775us-gaap_RoyaltyExpense    
Collaboration arrangement for development and commercialization of oral rotavirus strain | Glaxo | Rotarix        
REVENUE        
Product royalty expense $ 2,300us-gaap_RoyaltyExpense
/ us-gaap_CounterpartyNameAxis
= cldx_GlaxoSmithKlinePlcMember
/ us-gaap_ProductOrServiceAxis
= cldx_RotarixRotavirusVaccineMember
/ us-gaap_TypeOfArrangementAxis
= cldx_CollaborativeArrangementForDevelopmentAndCommercializationOfProductMember		 $ 10,800us-gaap_RoyaltyExpense
/ us-gaap_CounterpartyNameAxis
= cldx_GlaxoSmithKlinePlcMember
/ us-gaap_ProductOrServiceAxis
= cldx_RotarixRotavirusVaccineMember
/ us-gaap_TypeOfArrangementAxis
= cldx_CollaborativeArrangementForDevelopmentAndCommercializationOfProductMember		    
License agreements | Cincinnati Children's Hospital Medical Center | Rotarix        
REVENUE        
Percentage of license fee payable on net royalties received     30.00%cldx_PercentageOfLicenseFeeDueOnNetRoyaltiesReceived
/ us-gaap_CounterpartyNameAxis
= cldx_CincinnatiChildrensHospitalMedicalCenterMember
/ us-gaap_ProductOrServiceAxis
= cldx_RotarixRotavirusVaccineMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		  
Royalty Agreement | PRF | Rotarix        
REVENUE        
Percentage of interest in net royalties sold       70.00%cldx_PercentageOfInterestInNetRoyaltiesSold
/ us-gaap_CounterpartyNameAxis
= cldx_PRFAgreementMember
/ us-gaap_ProductOrServiceAxis
= cldx_RotarixRotavirusVaccineMember
/ us-gaap_TypeOfArrangementAxis
= cldx_RoyaltyAgreementMember