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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $) | Total | Common Stock [Member] | Additional Paid-in Capital [Member] | Accumulated Deficit [Member]
--- | --- | --- | --- | ---
BALANCE at Dec. 31, 2012 | $ 10,158,375 us-gaap_StockholdersEquity | $ 23 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 50,435,752 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (40,277,400)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE (in shares) at Dec. 31, 2012 |  | 2,319,739 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock and warrants, net of issuance costs | 4,975,153 us-gaap_StockIssuedDuringPeriodValueNewIssues | 6 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,975,147 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Issuance of common stock and warrants, net of issuance costs (in shares) |  | 550,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Fair value of warrants issued in connection with sale of common stock and recorded as a derivative liability | (4,975,043)clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock | 0 clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (4,975,043)clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock-based compensation | 2,323,233 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 2,323,233 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net loss | (10,782,168)us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (10,782,168)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE at Dec. 31, 2013 | 1,699,550 us-gaap_StockholdersEquity | 29 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 52,759,089 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (51,059,568)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE (in shares) at Dec. 31, 2013 |  | 2,869,739 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock and warrants, net of issuance costs | 11,877,143 us-gaap_StockIssuedDuringPeriodValueNewIssues | 36 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 11,877,107 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Issuance of common stock and warrants, net of issuance costs (in shares) |  | 3,583,333 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Issuance of common stock and warrants to extinguish convertible debentures and accrued interest | 4,172,435 clrb_StockAndWarrantsIssuedValueToExtinguishConvertibleDebentures | 11 clrb_StockAndWarrantsIssuedValueToExtinguishConvertibleDebentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,172,424 clrb_StockAndWarrantsIssuedValueToExtinguishConvertibleDebentures / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember |
Issuance of common stock and warrants to extinguish convertible debentures and accrued interest (in shares) |  | 1,109,690 clrb_StockAndWarrantsIssuedSharesToExtinguishConvertibleDebentures / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |
Fair value of warrants issued in connection with sale of common stock and recorded as a derivative liability | (4,102,709)clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock | 0 clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (4,102,709)clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 clrb_AdjustmentsToAdditionalPaidInCapitalWarrantsIssuedSaleOfCommonStock / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Stock-based compensation | 850,350 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 850,350 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalSharebasedCompensationRequisiteServicePeriodRecognitionValue / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Relative fair value of warrants issued with debentures | 254,024 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 254,024 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalWarrantIssued / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Cash paid in lieu of fractional shares in reverse stock split | (1,158)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockSplit | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockSplit / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | (1,158)us-gaap_AdjustmentsToAdditionalPaidInCapitalStockSplit / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | 0 us-gaap_AdjustmentsToAdditionalPaidInCapitalStockSplit / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
Net loss | (8,052,102)us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 0 us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | (8,052,102)us-gaap_NetIncomeLoss / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE at Dec. 31, 2014 | $ 6,697,533 us-gaap_StockholdersEquity | $ 76 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | $ 65,809,127 us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_AdditionalPaidInCapitalMember | $ (59,111,670)us-gaap_StockholdersEquity / us-gaap_StatementEquityComponentsAxis = us-gaap_RetainedEarningsMember
BALANCE (in shares) at Dec. 31, 2014 |  | 7,562,762 us-gaap_SharesOutstanding / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |

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