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Taxes on Income - Schedule of Deferred Tax Assets (Details) (10-K) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |
Net operating loss carry-forward | $ 488,603 | $ 481,052
Total deferred tax assets | 117,265 | 120,263
Valuation allowance | (117,265) | (120,263)
Net deferred tax asset |  |

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