Annual report pursuant to Section 13 and 15(d)

FAIR VALUE (Details Textual)

v2.4.1.9
FAIR VALUE (Details Textual)
 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 		   
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] The exercise prices of these warrants are subject to adjustment for “down-rounds” and the warrants have been accounted for as derivative instruments as described in Note 3.