Taxes on Income (Details) - Components of income tax expense (benefit) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Current:
Federal		$ (777)
State and local	25
Foreign	22	26
Income tax (expense) benefit, current	47	(751)
Deferred:
Federal
State and local
Income tax (expense) benefit, deferred
Income tax expense (benefit)	$ 47	$ (751)