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Income Taxes (Significant Valuation Allowances) (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | $ 14,455 | $ 12,434
United States |  |
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | 12,300 | 10,100
Domestic Tax Authority | United States |  |
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | 4,240 | 3,040
State and Local Jurisdiction | United States |  |
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | 8,057 | 7,092
Capital Loss Carryforward | Israel |  |
Tax Credit Carryforward [Line Items] |  |
Valuation allowance | $ 1,457 | $ 1,622

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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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