Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY (Details)

v2.4.1.9
STOCKHOLDERS' EQUITY (Details) (USD $)
 3 Months Ended
Mar. 31, 2015
Class of Warrant or Right [Line Items]  
Number Of Shares Issuable Upon Exercise Of Outstanding Warrants (in shares) 6,604,096us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
July 2010 Warrants [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]
July 2010 Warrants [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) $ 321.3us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantTwoMember
Warrants Expiration Date Jul. 27, 2015
July and December 2010 Warrants [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
July and December 2010 Warrants [Member] | Minimum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) $ 1,989.00us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
/ us-gaap_RangeAxis
= us-gaap_MinimumMember
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantThreeMember
July and December 2010 Warrants [Member] | Maximum [Member]  
Class of Warrant or Right [Line Items]  
Exercise Price (in dollars per share) $ 2,019.6us-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) $ 12.5us-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) $ 25us-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) $ 25us-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) $ 12us-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) $ 15us-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 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.