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STOCK-BASED COMPENSATION (Details 2) (USD $)
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12 Months Ended | |
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Dec. 31, 2014
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Dec. 31, 2013
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| Share-based Compensation, Stock Options, Activity [Line Items] | ||
| Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options | 634,658us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 321,959us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Granted - Number of Shares Issuable Upon Exercise of Outstanding Options | 120,300us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod | 344,278us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsGrantsInPeriod |
| Canceled - Number of Shares Issuable Upon Exercise of Outstanding Options | (18,437)clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod | (9,452)clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsCancelledInPeriod |
| Forfeited - Number of Shares Issuable Upon Exercise of Outstanding Options | (17,055)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod | (22,127)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsForfeituresInPeriod |
| Outstanding - Number of Shares Issuable Upon Exercise of Outstanding Options | 719,466us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber | 634,658us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingNumber |
| Vested - Number of Shares Issuable Upon Exercise of Outstanding Options | 333,907us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingNumber | |
| Unvested - Number of Shares Issuable Upon Exercise of Outstanding Options | 385,559clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOptionsUnvestedOutstandingNumber | |
| Exercisable - Number of Shares Issuable Upon Exercise of Outstanding Options | 333,907us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableNumber | |
| Outstanding - Weighted Average Exercise Price (in dollars per share) | $ 18.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 30.40us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Granted - Weighted Average Exercise Price (in dollars per share) | $ 3.69us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice | $ 9.20us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsExercisesInPeriodWeightedAverageExercisePrice |
| Canceled - Weighted Average Exercise Price (in dollars per share) | $ 24.19clrb_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancelledInPeriodWeightedAverageExercisePrice | $ 117.80clrb_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsCancelledInPeriodWeightedAverageExercisePrice |
| Forfeited - Weighted Average Exercise Price (in dollars per share) | $ 14.58us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice | $ 15.60us-gaap_ShareBasedCompensationArrangementsByShareBasedPaymentAwardOptionsForfeituresInPeriodWeightedAverageExercisePrice |
| Outstanding - Weighted Average Exercise Price (in dollars per share) | $ 15.59us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice | $ 18.07us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsOutstandingWeightedAverageExercisePrice |
| Vested - Weighted Average Exercise Price (in dollars per share) | $ 24.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestExercisableWeightedAverageExercisePrice | |
| Unvested - Weighted Average Exercise Price (in dollars per share) | $ 7.85clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsNonVestedExercisableWeightedAverageExercisePrice | |
| Exercisable - Weighted Average Exercise Price (in dollars per share) | $ 24.53us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsExercisableWeightedAverageExercisePrice | |
| Vested - Weighted Average Remaining Contracted Term in Years | 4 years 7 months 10 days | |
| Unvested - Weighted Average Remaining Contracted Term in Years | 9 years 1 month 2 days | |
| Exercisable - Weighted Average Remaining Contracted Term in Years | 4 years 7 months 10 days | |
| Vested - Aggregate Intrinsic Value (in dollars) | $ 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsVestedAndExpectedToVestOutstandingAggregateIntrinsicValue | |
| Unvested - Aggregate Intrinsic Value (in dollars) | 17,500clrb_ShareBasedCompensationArrangementByShareBasedPaymentAwardOptionsUnvestedOutstandingAggregateIntrinsicValue | |
| Exercisable - Aggregate Intrinsic Value (in dollars) | $ 0us-gaap_SharebasedCompensationArrangementBySharebasedPaymentAwardOptionsExercisableIntrinsicValue1 | |
| X | ||||||||||
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- Definition
The number of unvested equity-based payment instruments, including stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. No definition available.
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. No definition available.
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- Definition
As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are non vested. No definition available.
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| X | ||||||||||
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- Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise prices of unvested options outstanding. No definition available.
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| X | ||||||||||
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- Definition
Weighted average of the remaining contractual term for unvested portions of options outstanding and currently exercised or convertible in the 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. No definition available.
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| X | ||||||||||
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- Definition
Weighted average exercise price of options canceled. No definition available.
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- Details
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| X | ||||||||||
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- Definition
Amount of difference between fair value of the underlying shares reserved for issuance and exercise price of vested portions of options outstanding and currently exercisable. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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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. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Net number of share options (or share units) granted during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Number of options outstanding, including both vested and non-vested options. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
As of the balance sheet date, the weighted-average exercise price (at which grantees can acquire the shares reserved for issuance) for exercisable stock options that are fully vested or expected to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Amount by which the current fair value of the underlying stock exceeds the exercise price of fully vested and expected to vest options outstanding. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
As of the balance sheet date, the number of shares into which fully vested and expected to vest stock options outstanding can be converted under the option plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average remaining contractual term for fully vested and expected to vest options outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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| X | ||||||||||
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- Definition
Weighted average price at which option holders acquired shares when converting their stock options into shares. No definition available.
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| X | ||||||||||
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- Definition
Weighted average price at which grantees could have acquired the underlying shares with respect to stock options that were terminated. No definition available.
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