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ACCRUED EXPENSES (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2014
Dec. 31, 2013
ACCRUED EXPENSES.    
Accrued Royalty and License Fees   $ 250cldx_AccruedRoyaltyAndLicenseFeesCurrent
Accrued Payroll and Employee Benefits 4,284us-gaap_EmployeeRelatedLiabilitiesCurrent 3,515us-gaap_EmployeeRelatedLiabilitiesCurrent
Accrued Research and Development Contract Costs 12,696cldx_AccruedResearchAndDevelopmentContractCostsCurrent 11,840cldx_AccruedResearchAndDevelopmentContractCostsCurrent
Accrued Professional Fees 490us-gaap_AccruedProfessionalFeesCurrent 556us-gaap_AccruedProfessionalFeesCurrent
Other Accrued Expenses 1,826us-gaap_OtherAccruedLiabilitiesCurrent 1,018us-gaap_OtherAccruedLiabilitiesCurrent
Accrued Expenses $ 19,296us-gaap_AccruedLiabilitiesCurrent $ 17,179us-gaap_AccruedLiabilitiesCurrent