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TAXES ON INCOME (Schedule Of Deferred Income Taxes) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Net operating loss carry forward $ 71,653 $ 75,755
Temporary differences mainly relating to Research and Development, reserves and allowances 25,773 24,875
Deferred tax asset before valuation allowance 97,426 100,630
Valuation allowance (89,320) (93,154)
Deferred tax asset 8,106 7,476
Deferred tax liabilities:    
Other temporary differences (28)
Deferred tax asset, net $ 8,106 $ 7,448