Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Summary of net revenues by geographic region
Total revenues	$ 2,375	$ 2,332
Revenues percentage	100.00%	100.00%
United States [Member]
Summary of net revenues by geographic region
Total revenues	$ 1,139	$ 1,118
Revenues percentage	48.00%	48.00%
Japan [Member]
Summary of net revenues by geographic region
Total revenues	$ 788	$ 448
Revenues percentage	33.00%	19.00%
Germany [Member]
Summary of net revenues by geographic region
Total revenues	$ 228	$ 314
Revenues percentage	10.00%	13.00%
China [Member]
Summary of net revenues by geographic region
Total revenues	$ 129	$ 269
Revenues percentage	5.00%	12.00%
Taiwan [Member]
Summary of net revenues by geographic region
Total revenues	$ 63	$ 70
Revenues percentage	3.00%	3.00%
Singapore [Member]
Summary of net revenues by geographic region
Total revenues	$ 1	$ 45
Revenues percentage		2.00%
Canada [Member]
Summary of net revenues by geographic region
Total revenues		$ 50
Revenues percentage		2.00%
Other [Member]
Summary of net revenues by geographic region
Total revenues	$ 27	$ 18
Revenues percentage	1.00%	1.00%