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COLLABORATION AGREEMENTS (Details) (License agreements, USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Collaborative Agreements      
Nonrefundable license fee expense $ 3.2cldx_NonRefundableLicenseFee $ 0.7cldx_NonRefundableLicenseFee $ 0.7cldx_NonRefundableLicenseFee
Medarex | Maximum
      
Collaborative Agreements      
Period from the first commercial sale of licensed product for royalty payment 10 years    
Milestone payment due 7.0cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_MedarexIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Rockefeller | Maximum
      
Collaborative Agreements      
Milestone payment due 3.8cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_RockefellerUniversityMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Duke | Maximum
      
Collaborative Agreements      
Milestone payment due 0.7cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_DukeUniversityBrainTumorCancerCenterMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Ludwig | Maximum
      
Collaborative Agreements      
Milestone payment due 1.0cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_LudwigInstituteForCancerResearchMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Alteris | Maximum
      
Collaborative Agreements      
Milestone payment due 5.0cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_AlterisTherapeuticsIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Southampton | Maximum
      
Collaborative Agreements      
Milestone payment due 1.4cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_UniversityOfSouthamptonUKMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Amgen | Maximum
      
Collaborative Agreements      
Milestone payment due 1.0cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_CounterpartyNameAxis
= cldx_AmgenIncMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Seattle Genetics | CuraGen | Maximum | Glembatumumab Vedotin
      
Collaborative Agreements      
Milestone payment due 5.0cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_BusinessAcquisitionAxis
= cldx_CuraGenCorporationMember
/ us-gaap_CounterpartyNameAxis
= cldx_SeattleGeneticIncMember
/ us-gaap_ProductOrServiceAxis
= cldx_GlembatumumabVedotinMember
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember		    
Seattle Genetics | CuraGen | Maximum | CDX-014
      
Collaborative Agreements      
Milestone payment due $ 9.0cldx_CollaborativeArrangementTotalPotentialMilestonePayments
/ us-gaap_BusinessAcquisitionAxis
= cldx_CuraGenCorporationMember
/ us-gaap_CounterpartyNameAxis
= cldx_SeattleGeneticIncMember
/ us-gaap_ProductOrServiceAxis
= cldx_Cdx014Member
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_TypeOfArrangementAxis
= cldx_LicenseAgreementsMember