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TAXES ON INCOME (Schedule of Deferred Income Taxes) (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
In respect of:        
Net operating loss carry forward $ 34,835 $ 25,879    
Research and development expenses 7,133 7,842    
Other 1,085 1,226    
Less - valuation allowance (43,053) (34,947) $ (26,166) $ (21,982)
Net deferred tax assets