TAXES ON INCOME (Deferred Income Taxes) (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
In respect of:
Research and development expenses	$ 9,247	$ 6,188
Other timing differences	25	(11)
Net operating loss carry forwards	50,236	49,436
Valuation allowance	(59,508)	(55,613)
Deferred Tax Assets, Net of Valuation Allowance, Total	$ 0	$ 0