Geographic Information and Major Customer and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Major Customer [Line Items]
Total revenues	$ 1,234	$ 1,617	$ 3,692	$ 4,966
Israel [Member]
Revenue, Major Customer [Line Items]
Total revenues			2
United States [Member]
Revenue, Major Customer [Line Items]
Total revenues	569	962	1,492	3,231
Europe [Member]
Revenue, Major Customer [Line Items]
Total revenues	665	553	2,162	1,567
Asia-Pacific [Member]
Revenue, Major Customer [Line Items]
Total revenues		2	36	10
Latin America [Member]
Revenue, Major Customer [Line Items]
Total revenues				58
Africa [Member]
Revenue, Major Customer [Line Items]
Total revenues		$ 100		$ 100