Taxes on Income - Schedule of Changes in Valuation Allowance (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017		Dec. 31, 2016
Income Tax Disclosure [Abstract]
Balance at the beginning of the year		$ 29,682	[1]	$ 28,970
Changes following enactment of the Act		(5,879)
Other changes		3,437		712
Balance at the end of the year	[1]	$ 27,240		$ 29,682

[1] 2017 balances are presented under long term deferred taxes, due to implementation of ASU 2015-17.