Income Taxes (Significant Net Operating Losses and Credit Carryforwards) (Details) $ in Thousands	Dec. 31, 2019 USD ($)
United States | Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Tax credit carryforwards	$ 1,431
United States | State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	92,407
Israel
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 10,684