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FAIR VALUE (Details Textual) (USD $) | 12 Months Ended |
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Dec. 31, 2014 | Dec. 31, 2013 | Feb. 20, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Fair Value Assumptions, Risk Free Interest Rate | 1.07%us-gaap_FairValueAssumptionsRiskFreeInterestRate |  | 2.63%us-gaap_FairValueAssumptionsRiskFreeInterestRate |
Fair Value Assumptions, Expected Volatility Rate | 100.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate |  | 115.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate |
Fair Value Assumptions, Expected Term | 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 | 6,604,096 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  | 275,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights
Fair Value, Inputs, Level 3 [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 | 550,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_FairValueByFairValueHierarchyLevelAxis = us-gaap_FairValueInputsLevel3Member |  |  |
February 2013 Public Offering 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 | 825,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_SubsidiarySaleOfStockAxis = clrb_February2013PublicOfferingWarrantsMember |  |  |
August 2014 Underwritten Offering [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Warrants Settleable In Cash, Cash Settlement Feature | 4,943,023 clrb_WarrantsSettleableInCashCashSettlementFeature / us-gaap_SubsidiarySaleOfStockAxis = clrb_August2014UnderwrittenOfferingMember |  |  |
Legacy Warrants |  |  |  |
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 | 1,365 us-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 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.

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- Definition Warrants settleable in cash which reclassified as liability. + References No definition available. + Details
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- Definition Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph i -Subparagraph 2 -Article 4 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Measure of dispersion, in percentage terms (for instance, the standard deviation or variance), for a given stock price. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Risk-free interest rate assumption used in valuing an instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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