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Commitments, Contingencies, and Concentrations (Geographic Concentrations) (Details) | Dec. 31, 2018 | Dec. 31, 2017
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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%

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- Definition [Line Items] for Cash and Cash Equivalents by Region [Table] + References No definition available. + Details
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- Definition The of percentage of cash and cash equivalents reported by region. + References No definition available. + Details
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