Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE (Details Textual)

v2.4.1.9
FAIR VALUE (Details Textual)
 3 Months Ended 12 Months Ended
Mar. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Aug. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Fair Value Assumptions, Risk Free Interest Rate 0.87%us-gaap_FairValueAssumptionsRiskFreeInterestRate 1.07%us-gaap_FairValueAssumptionsRiskFreeInterestRate 2.63%us-gaap_FairValueAssumptionsRiskFreeInterestRate  
Fair Value Assumptions, Expected Volatility Rate 90.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate 100.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate 115.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate  
Fair Value Assumptions, Expected Term 2 years 10 months 20 days 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      
February 2013 Public Offering Warrants [Member] | Fair Value, Inputs, Level 3 [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Class of Warrant or Right, Outstanding 550,000us-gaap_ClassOfWarrantOrRightOutstanding
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingWarrantsMember 		     
August 2014 Public Offering Warrants [Member]        
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]        
Number Of Warrants Issued       4,943,023clrb_NumberOfWarrantsIssued
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_August2014PublicOfferingWarrantsMember
July 2010 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 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 warrants may be exercised are subject to adjustment for “down-rounds” and the warrants have been accounted for as derivative instruments as described in Note 2, with the exception of 96,988 warrants issued to the underwriter in August 2014, which did not include the cash settlement feature.