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TERM LOAN (Details) (Term Loan, USD $)
In Millions, unless otherwise specified
 1 Months Ended 12 Months Ended 1 Months Ended
May 31, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Mar. 31, 2011
Term Loan          
Repayment of principal amount $ 8.8cldx_RepaymentOfLongTermDebtPrincipalAmount        
Amount of interest, prepayment and final payment fees 0.7cldx_DebtInstrumentInterestAndPrepaymentFees        
Interest expense on the term loan   0.8us-gaap_InterestExpenseLongTermDebt 1.5us-gaap_InterestExpenseLongTermDebt    
MidCap          
Term Loan          
Amount borrowed       10.0us-gaap_ProceedsFromIssuanceOfDebt
/ cldx_DebtInstrumentLenderAxis
= cldx_MidCapFinancialLLCMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember		  
GECC          
Term Loan          
Amount borrowed         $ 5.0us-gaap_ProceedsFromIssuanceOfDebt
/ cldx_DebtInstrumentLenderAxis
= cldx_GeneralElectricCapitalCorporationMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SecuredDebtMember