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Income Taxes (Significant Net Operating Losses and Credit Carryforwards) (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
United States | Foreign Tax Authority  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 748
United States | State and Local Jurisdiction  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards 85,137
Israel  
Operating Loss Carryforwards [Line Items]  
Operating loss carryforwards $ 3,202