| FAIR VALUE (Details) (USD $)
 | Dec. 31, 2014 | Dec. 31, 2013 | 
      
        | Liabilities: |  |  | 
      
        | Warrants | $ 5,176,915us-gaap_DerivativeLiabilitiesCurrent | $ 3,359,363us-gaap_DerivativeLiabilitiesCurrent | 
      
        | February 2013 Public Offering Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 1,127,500us-gaap_DerivativeLiabilitiesCurrent / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 3,355,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 
      
        | August 2014 Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 4,048,416us-gaap_DerivativeLiabilitiesCurrent / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_August2014WarrantsMember
 |  | 
      
        | Legacy Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 999us-gaap_DerivativeLiabilitiesCurrent / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | 4,363us-gaap_DerivativeLiabilitiesCurrent / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | 
      
        | Fair Value, Inputs, Level 1 [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 | 
      
        | Fair Value, Inputs, Level 1 [Member] | February 2013 Public Offering Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 
      
        | Fair Value, Inputs, Level 1 [Member] | August 2014 Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_August2014WarrantsMember
 |  | 
      
        | Fair Value, Inputs, Level 1 [Member] | Legacy Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel1Member
 / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | 
      
        | Fair Value, Inputs, Level 2 [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 4,049,415us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 | 4,363us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 | 
      
        | Fair Value, Inputs, Level 2 [Member] | February 2013 Public Offering Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 
      
        | Fair Value, Inputs, Level 2 [Member] | August 2014 Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 4,048,416us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_August2014WarrantsMember
 |  | 
      
        | Fair Value, Inputs, Level 2 [Member] | Legacy Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 999us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | 4,363us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel2Member
 / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | 
      
        | Fair Value, Inputs, Level 3 [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 1,127,500us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 | 3,355,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 | 
      
        | Fair Value, Inputs, Level 3 [Member] | February 2013 Public Offering Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 1,127,500us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 3,355,000us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_February2013PublicOfferingWarrantsMember
 | 
      
        | Fair Value, Inputs, Level 3 [Member] | August 2014 Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 / us-gaap_SubsidiarySaleOfStockAxis
 = clrb_August2014WarrantsMember
 |  | 
      
        | Fair Value, Inputs, Level 3 [Member] | Legacy Warrants [Member] |  |  | 
      
        | Liabilities: |  |  | 
      
        | Warrants | $ 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 | $ 0us-gaap_DerivativeLiabilitiesCurrent / us-gaap_FairValueByFairValueHierarchyLevelAxis
 = us-gaap_FairValueInputsLevel3Member
 / us-gaap_StatementEquityComponentsAxis
 = clrb_WarrantOneMember
 |