Annual report pursuant to Section 13 and 15(d)

FAIR VALUE (Details Textual)

v2.4.1.9
FAIR VALUE (Details Textual) (USD $)
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Feb. 20, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Fair Value Assumptions, Risk Free Interest Rate 1.07%us-gaap_FairValueAssumptionsRiskFreeInterestRate 2.63%us-gaap_FairValueAssumptionsRiskFreeInterestRate  
Fair Value Assumptions, Expected Volatility Rate 100.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate 115.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate  
Fair Value Assumptions, Expected Term 3 years 1 month 20 days 3 years 10 months 20 days  
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 6,604,096us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights   275,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 550,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member 		   
February 2013 Public Offering Warrants [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 825,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingWarrantsMember 		   
August 2014 Underwritten Offering [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Warrants Settleable In Cash, Cash Settlement Feature 4,943,023clrb_WarrantsSettleableInCashCashSettlementFeature
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_August2014UnderwrittenOfferingMember 		   
Legacy Warrants      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Class of Warrant or Right, Number of Securities Called by Warrants or Rights 1,365us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember 		[1]    
[1] These warrants have a certain type of cash settlement feature or their exercise prices or the number of shares for which the warrant may be exercised are subject to adjustment for “down-rounds” and the warrants have been accounted for as derivative instruments as described in Note 3, with the exception of 96,988 warrants issued in August 2014.