Geographic Information and Major Customer and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenue, Major Customer [Line Items]
Total revenues	$ 1,581	$ 1,579
Israel [Member]
Revenue, Major Customer [Line Items]
Total revenues
United States [Member]
Revenue, Major Customer [Line Items]
Total revenues	497	1,178
Europe [Member]
Revenue, Major Customer [Line Items]
Total revenues	1,079	341
Asia-Pacific [Member]
Revenue, Major Customer [Line Items]
Total revenues	5	2
Latin America [Member]
Revenue, Major Customer [Line Items]
Total revenues		$ 58