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STOCK-BASED COMPENSATION (Details Textual) (USD $) | 1 Months Ended | 12 Months Ended | 1 Months Ended
--- | --- | --- | ---
Feb. 20, 2014 | Nov. 30, 2013 | Dec. 31, 2014 | Dec. 31, 2013 | Oct. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  | 81,805 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross |  |
Share Based Compensation Arrangement By Share Based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  | $ 24.53 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice |  |
Employee Service Share Based Compensation Nonvested Total Compensation In Current Year |  |  | $ 615,754 clrb_EmployeeServiceShareBasedCompensationNonvestedTotalCompensationInCurrentYear |  |
Employee Service Share Based Compensation Nonvested Total Compensation In Year Two |  |  | 455,975 clrb_EmployeeServiceShareBasedCompensationNonvestedTotalCompensationInYearTwo |  |
Employee Service Share Based Compensation Nonvested Total Compensation In Year Three |  |  | 265,240 clrb_EmployeeServiceShareBasedCompensationNonvestedTotalCompensationInYearThree |  |
Weighted-Average Grant-Date Fair Value Of Vested Options Outstanding (in dollars per share) |  |  | $ 14.55 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue | $ 17.60 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedWeightedAverageGrantDateFairValue |
Weighted Average Grant Date Fair Value Of Unvested Options Outstanding (in dollars per share) |  |  | $ 4.67 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue | $ 6.60 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsNonvestedWeightedAverageGrantDateFairValue |
Share Based Compensation Arrangement By Share Based Payment Award Options Unvested and Expected To Vest Outstanding Number (in shares) |  |  | 253,754 clrb_ShareBasedCompensationArrangementBySharebasedPaymentAwardOptionsUnvestedAndExpectedToVestOutstandingNumber |  |
Estimated Stock Based Compensation Expense Up On Vesting Of Options |  |  | 418,024 clrb_EstimatedStockBasedCompensationExpenseUpOnVestingOfOptions |  |
Anti-Dilution Option Reduced By Expiration Of Warrants | 14,474 clrb_AntidilutionOptionReducedByExpirationOfWarrants |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 10.00 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 275,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  | 6,604,096 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |
Anti-Dilution Option Reduced Rate |  |  |  |  | 19 clrb_AntidilutionOptionReducedRate
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized |  |  | 1,754,993 us-gaap_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognized |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant |  |  | 112,657 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfSharesAvailableForGrant |  |
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost |  | 171,835 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost |  | 136,022 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardPlanModificationIncrementalCompensationCost |
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost |  | 101,972 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost | 47,853 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost | 569,496 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardAcceleratedCompensationCost |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value |  |  | $ 3.01 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue | $ 5.60 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageGrantDateFairValue |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value |  |  | $ 936,310 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 | $ 2,109,200 us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsVestedInPeriodFairValue1 |
Performance Based [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 264,278 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_AwardTypeAxis = clrb_PerformanceBasedMember
Stock Incentive Plan 2006 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance |  |  | 700,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_MajorTypesOfDebtAndEquitySecuritiesAxis = clrb_StockIncentivePlan2006Member |  |
Employee [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures Rate |  |  | 2.00%clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresRate / us-gaap_TitleOfIndividualAxis = clrb_EmployeeMember |  |
Chief Executive Officer [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross |  |  |  |  | 96,278 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriodGross / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Share Based Compensation Arrangement By Share Based Payment Award, Options, Exercisable, Weighted Average Exercise Price |  |  |  |  | 15.00 us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice / us-gaap_TitleOfIndividualAxis = us-gaap_ChiefExecutiveOfficerMember
Director [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Options Forfeitures Rate |  |  | 0.00%clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresRate / us-gaap_TitleOfIndividualAxis = us-gaap_DirectorMember |  |

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- Definition Aggregate value for unrecognized compensation cost related to the unvested stock-based compensation arrangements in year three. + References No definition available. + Details
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- Definition Aggregate value for unrecognized compensation cost related to the unvested stock-based compensation arrangements in year two. + References No definition available. + Details
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- Definition It represents annual forfeiture rate of unvested options. + References No definition available. + Details
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- Definition Number of outstanding options Unvested and expected to vest held by the Employee Stock Option Plan as of the balance sheet date. + References No definition available. + Details
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- Definition Exercise price per share or per unit of warrants or rights outstanding. + 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)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + 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 Aggregate number of common shares reserved for future issuance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.29) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Unrecognized cost of unvested share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Additional share-based compensation cost recognized as a result of an occurrence of an event that accelerates its recognition. + References No definition available. + Details
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- Definition The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition An excess of the fair value of the modified award over the fair value of the award immediately before the modification. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(2)(iii) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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