Geographic Information and Major Customer and Product Data (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenue, Major Customer [Line Items]
Total revenues	$ 877	$ 1,770	$ 2,458	$ 3,349
Israel [Member]
Revenue, Major Customer [Line Items]
Total revenues	2		2
United States [Member]
Revenue, Major Customer [Line Items]
Total revenues	923	2,269	426	1,091
Europe [Member]
Revenue, Major Customer [Line Items]
Total revenues	1,497	1,014	418	673
Asia-Pacific [Member]
Revenue, Major Customer [Line Items]
Total revenues	36	8	31	6
Latin America [Member]
Revenue, Major Customer [Line Items]
Total revenues		$ 58