Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Summary of net revenues by geographic region
Total revenues	$ 2,012	$ 2,375
Revenues percentage	100.00%	100.00%
Japan [Member]
Summary of net revenues by geographic region
Total revenues	$ 600	$ 788
Revenues percentage	30.00%	33.00%
Germany [Member]
Summary of net revenues by geographic region
Total revenues	$ 186	$ 228
Revenues percentage	9.00%	10.00%
United States [Member]
Summary of net revenues by geographic region
Total revenues	$ 1,063	$ 1,139
Revenues percentage	53.00%	48.00%
China [Member]
Summary of net revenues by geographic region
Total revenues	$ 75	$ 129
Revenues percentage	4.00%	5.00%
Taiwan [Member]
Summary of net revenues by geographic region
Total revenues	$ 40	$ 63
Revenues percentage	2.00%	3.00%
Other [Member]
Summary of net revenues by geographic region
Total revenues	$ 46	$ 27
Revenues percentage	2.00%	1.00%
Singapore [Member]
Summary of net revenues by geographic region
Total revenues	$ 2	$ 1
Revenues percentage