Annual report pursuant to Section 13 and 15(d)

RESTRUCTURING COSTS AND OTHER CORPORATE CHANGES (Details Textual)

v2.4.1.9
RESTRUCTURING COSTS AND OTHER CORPORATE CHANGES (Details Textual) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Restructuring Cost and Reserve [Line Items]    
Severance Costs $ 160,000us-gaap_SeveranceCosts1  
Restructuring Costs, Total 221,816us-gaap_RestructuringCosts 1,096,874us-gaap_RestructuringCosts
Restructuring Charges   1,097,000us-gaap_RestructuringCharges
Severance And Retention Expense [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges   386,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= clrb_SeveranceAndRetentionExpenseMember
Stock Based Compensation Expense Related To Modification Of Options [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges 48,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= clrb_StockBasedCompensationExpenseRelatedToModificationOfOptionsMember
706,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= clrb_StockBasedCompensationExpenseRelatedToModificationOfOptionsMember
Other Administrative Expense [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges   5,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= clrb_OtherAdministrativeExpenseMember
Newton office [Member]    
Restructuring Cost and Reserve [Line Items]    
Restructuring Charges $ 14,000us-gaap_RestructuringCharges
/ us-gaap_RestructuringCostAndReserveAxis
= clrb_NewtonOfficeMember