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Taxes on Income - Schedule of Deferred Tax Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Income Tax Disclosure [Abstract]    
Net operating loss carry-forwards $ 512,260 $ 503,065
Other net deferred tax assets 107,574 115,705
Valuation allowance (107,574) (115,705)
Net deferred tax assets $ 0 $ 0