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INCOME TAXES (Details 1) (USD $) | Dec. 31, 2014 | Dec. 31, 2013
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Deferred tax assets |  |
Federal net operating loss | $ 29,246,965 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic | $ 25,731,718 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsDomestic
Federal research and development tax credit carryforwards | 2,689,775 clrb_DeferredTaxAssetsTaxCreditCarryForwardsDomesticResearchAndDevelopment | 2,480,417 clrb_DeferredTaxAssetsTaxCreditCarryForwardsDomesticResearchAndDevelopment
State net operating loss | 1,813,954 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal | 2,070,642 us-gaap_DeferredTaxAssetsOperatingLossCarryforwardsStateAndLocal
State research and development tax credit carryforwards | 753,818 clrb_DeferredTaxAssetsTaxCreditCarryForwardsStateAndLocalResearchAndDevelopment | 724,200 clrb_DeferredTaxAssetsTaxCreditCarryForwardsStateAndLocalResearchAndDevelopment
Capitalized research and development expenses | 10,609,942 clrb_DeferredTaxAssetsDeferredExpenseCapitalizedResearchAndDevelopmentCosts | 11,128,803 clrb_DeferredTaxAssetsDeferredExpenseCapitalizedResearchAndDevelopmentCosts
Stock-based compensation expense | 1,758,909 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost | 1,599,005 us-gaap_DeferredTaxAssetsTaxDeferredExpenseCompensationAndBenefitsShareBasedCompensationCost
Intangible assets | 313,412 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets | 380,339 us-gaap_DeferredTaxAssetsGoodwillAndIntangibleAssets
Charitable contribution carryforwards | 0 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards | 34,850 us-gaap_DeferredTaxAssetsCharitableContributionCarryforwards
Accrued liabilities | 35,392 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities | 26,112 us-gaap_DeferredTaxAssetsTaxDeferredExpenseReservesAndAccrualsAccruedLiabilities
Total deferred tax assets | 47,222,167 us-gaap_DeferredTaxAssetsGross | 44,176,086 us-gaap_DeferredTaxAssetsGross
Deferred tax liabilities |  |
Depreciable assets | (245,785)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment | (257,314)us-gaap_DeferredTaxLiabilitiesPropertyPlantAndEquipment
Total deferred tax liabilities | (245,785)us-gaap_DeferredIncomeTaxLiabilities | (257,314)us-gaap_DeferredIncomeTaxLiabilities
Net deferred tax assets | 46,976,382 us-gaap_DeferredTaxAssetsNet | 43,918,772 us-gaap_DeferredTaxAssetsNet
Less- valuation allowance | (46,976,382)us-gaap_DeferredTaxAssetsValuationAllowance | (43,918,772)us-gaap_DeferredTaxAssetsValuationAllowance
Total deferred tax assets | $ 0 us-gaap_DeferredTaxAssetsLiabilitiesNet | $ 0 us-gaap_DeferredTaxAssetsLiabilitiesNet

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