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INCOME TAXES (Narrative) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
INCOME TAXES [Abstract]      
Israeli corporate tax rate 26.50%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate 25.00%us-gaap_EffectiveIncomeTaxRateReconciliationAtFederalStatutoryIncomeTaxRate
Tax payment withheld $ 360us-gaap_IncomeTaxesPaid    
U.S. income state and local taxes rate (as a percent) 35.00%us-gaap_EffectiveIncomeTaxRateReconciliationStateAndLocalIncomeTaxes    
Milestone payments received 7,200us-gaap_RevenueRecognitionMilestoneMethodRevenueRecognized    
Israel [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward 167,255us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_DomesticCountryMember
   
United States [Member]      
Operating Loss Carryforwards [Line Items]      
Net operating loss carryforward $ 14,455us-gaap_OperatingLossCarryforwards
/ us-gaap_IncomeTaxAuthorityAxis
= us-gaap_InternalRevenueServiceIRSMember
   
United States [Member] | Minimum [Member]      
Operating Loss Carryforwards [Line Items]      
Year of expiration of operating loss carryforward Dec. 31, 2019    
United States [Member] | Maximum [Member]      
Operating Loss Carryforwards [Line Items]      
Year of expiration of operating loss carryforward Dec. 31, 2032