Quarterly report pursuant to Section 13 or 15(d)

FAIR VALUE (Details)

v2.4.1.9
FAIR VALUE (Details) (USD $)
Mar. 31, 2015
Dec. 31, 2014
Liabilities:    
Warrants $ 4,888,664us-gaap_DerivativeLiabilitiesCurrent $ 5,176,915us-gaap_DerivativeLiabilitiesCurrent
February 2013 Public Offering Warrants [Member]    
Liabilities:    
Warrants 1,039,500us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingWarrantsMember
1,127,500us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingWarrantsMember
July 2010 Warrants [Member]    
Liabilities:    
Warrants 700us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember
999us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember
August 2014 Warrants [Member]    
Liabilities:    
Warrants 3,848,464us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
4,048,416us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
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] | July 2010 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 1 [Member] | August 2014 Warrants [Member]    
Liabilities:    
Warrants 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel1Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
Fair Value, Inputs, Level 2 [Member]    
Liabilities:    
Warrants 3,849,164us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
4,049,415us-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] | July 2010 Warrants [Member]    
Liabilities:    
Warrants 700us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember
999us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarrantOneMember
Fair Value, Inputs, Level 2 [Member] | August 2014 Warrants [Member]    
Liabilities:    
Warrants 3,848,464us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
4,048,416us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel2Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
Fair Value, Inputs, Level 3 [Member]    
Liabilities:    
Warrants 1,039,500us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
1,127,500us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
Fair Value, Inputs, Level 3 [Member] | February 2013 Public Offering Warrants [Member]    
Liabilities:    
Warrants 1,039,500us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingWarrantsMember
1,127,500us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_SubsidiarySaleOfStockAxis
= clrb_February2013PublicOfferingWarrantsMember
Fair Value, Inputs, Level 3 [Member] | July 2010 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
Fair Value, Inputs, Level 3 [Member] | August 2014 Warrants [Member]    
Liabilities:    
Warrants $ 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember
$ 0us-gaap_DerivativeLiabilitiesCurrent
/ us-gaap_FairValueByFairValueHierarchyLevelAxis
= us-gaap_FairValueInputsLevel3Member
/ us-gaap_StatementEquityComponentsAxis
= clrb_WarranttwomemberMember