Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Summary of net revenues by geographic region
Total revenues	$ 1,923	$ 2,305	$ 6,174	$ 6,966
Revenues percentage	100.00%	100.00%	100.00%	100.00%
United States [Member]
Summary of net revenues by geographic region
Total revenues	$ 1,101	$ 977	$ 3,033	$ 3,203
Revenues percentage	57.00%	42.00%	49.00%	46.00%
Japan [Member]
Summary of net revenues by geographic region
Total revenues	$ 623	$ 771	$ 2,119	$ 1,666
Revenues percentage	32.00%	33.00%	34.00%	24.00%
Germany [Member]
Summary of net revenues by geographic region
Total revenues	$ 195	$ 341	$ 604	$ 911
Revenues percentage	10.00%	15.00%	10.00%	13.00%
China [Member]
Summary of net revenues by geographic region
Total revenues	$ (67)	$ 92	$ 130	$ 631
Revenues percentage	(3.00%)	4.00%	2.00%	9.00%
Taiwan [Member]
Summary of net revenues by geographic region
Total revenues	$ 49	$ 43	$ 159	$ 137
Revenues percentage	3.00%	2.00%	3.00%	2.00%
Sweden [Member]
Summary of net revenues by geographic region
Total revenues			$ 10	$ 106
Revenues percentage				2.00%
Singapore [Member]
Summary of net revenues by geographic region
Total revenues				$ 141
Revenues percentage				2.00%
Other [Member]
Summary of net revenues by geographic region
Total revenues	$ 22	$ 81	$ 119	$ 171
Revenues percentage	1.00%	4.00%	2.00%	2.00%