Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY (Details)

v2.4.1.9
STOCKHOLDERS' EQUITY (Details) (USD $)
 12 Months Ended
Dec. 31, 2014
Feb. 20, 2014
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 6,604,096us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights 275,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Exercise Price (in dollars per share)   $ 10.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Warrant One [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 1,365us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember 		[1]  
Exercise Price (in dollars per share) $ 3.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember 		[1]  
Warrants Expiration Date Jul. 27, 2015 [1]  
Warrant Two [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 5,252us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantTwoMember 		 
Exercise Price (in dollars per share) $ 321.30us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantTwoMember 		 
Warrants Expiration Date Jul. 27, 2015  
Warrant Three [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 4,570us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantThreeMember 		 
Warrants Expiration Date Dec. 31, 2015  
Warrant Three [Member] | Minimum [Member]    
Class of Warrant or Right [Line Items]    
Exercise Price (in dollars per share) $ 1,989us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantThreeMember 		 
Warrant Three [Member] | Maximum [Member]    
Class of Warrant or Right [Line Items]    
Exercise Price (in dollars per share) $ 2,019.60us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantThreeMember 		 
August 2014 Public Offering [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 5,040,011us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_August2014PublicOfferingMember 		[1]  
Exercise Price (in dollars per share) $ 4.68us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_August2014PublicOfferingMember 		[1]  
Warrants Expiration Date Aug. 20, 2019 [1]  
February 2013 Public Offering [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 550,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingMember 		[1]  
Exercise Price (in dollars per share) $ 3.75us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingMember 		[1]  
Warrants Expiration Date Feb. 20, 2018 [1]  
February 2013 Public Offering - Placement Agents [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 38,496us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingPlacementAgentsMember 		 
Exercise Price (in dollars per share) $ 12.50us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingPlacementAgentsMember 		 
Warrants Expiration Date Feb. 04, 2018  
November 2012 Private Placement [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 50,000us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_NovemberPrivatePlacementMember 		 
Exercise Price (in dollars per share) $ 25.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_NovemberPrivatePlacementMember 		 
Warrants Expiration Date Nov. 02, 2017  
June 2012 Public Offering [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 149,069us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_JunePublicOfferingMember 		 
Exercise Price (in dollars per share) $ 25.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_JunePublicOfferingMember 		 
Warrants Expiration Date Jun. 13, 2017  
December 2011 Underwritten Offering [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 462,411us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_UnderwrittenOfferingMember 		 
Exercise Price (in dollars per share) $ 12.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_UnderwrittenOfferingMember 		 
Warrants Expiration Date Dec. 06, 2016  
April 2011 Private Placement [Member]    
Class of Warrant or Right [Line Items]    
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 302,922us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_AprilPrivatePlacementMember 		 
Exercise Price (in dollars per share) $ 15.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_AprilPrivatePlacementMember 		 
Warrants Expiration Date Mar. 31, 2016  
[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.