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Taxes on Income - Schedule of Deferred Tax Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Dec. 31, 2016
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Income Tax Disclosure [Abstract] |  |  |  |
Net operating loss carry-forward | $ 491,965 | $ 488,603 | $ 485,830 | $ 481,052
Total deferred tax assets | 103,313 | 117,265 | 111,740 | 120,263
Valuation allowance | (103,313) | (117,265) | (111,740) | (120,263)
Net deferred tax asset |  |  |  |

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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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