Taxes on Income (Details) - Components of income tax expense (benefit) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Current:
Federal	$ (89)
State and local
Foreign	23	23
Income tax (expense) benefit, current	(66)	23
Deferred:
Federal
State and local
Income tax (expense) benefit, deferred
Income tax (benefit) expense	$ (66)	$ 23