Commitments and Contingencies (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Commitments and Contingencies (Textual)
Bank guarantees to government bodies	$ 1,010
Bank guarantees to others	85
Aggregate guarantee amount	1,095
Advanced deposit	500
Restricted cash	$ 4,180	$ 4,125	$ 7,388	$ 9,079
Cash and cash equivalents weighted average interest rate	0.13%
Foreign currency exchange rate risks, description	During the period January 1, 2019 through June 30, 2019, the USD has fluctuated by approximately 4.9% against the NIS (the USD has weakened relative to the NIS). By contrast, during the period January 1, 2018 through December 31, 2018, the USD fluctuated by approximately 8.1% against the NIS (the USD strengthened relative to the NIS). Continued weakening of the US dollar against the NIS will result in higher operating costs from NIS denominated expenses. To date, we have not hedged any of our currency exchange rate risks, but we may do so in the future.