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Commitments, Contingencies, and Concentrations (Geographic Concentrations) (Details)
Dec. 31, 2018
Dec. 31, 2017
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 100.00% 100.00%
Asia    
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 28.00% 28.00%
United States    
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 7.00% 7.00%
Israel    
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 35.00% 37.00%
Europe    
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 13.00% 15.00%
United Kingdom    
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 12.00% 5.00%
Canada    
Cash and Cash Equivalents by Region [Line Items]    
Percentage of cash and cash equivalents by region 5.00% 8.00%