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Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Summary of net revenues by geographic region
Total revenues	$ 1,310	$ 1,923	$ 5,032	$ 6,174
Revenues percentage	100.00%	100.00%	100.00%	100.00%
United States [Member]
Summary of net revenues by geographic region
Total revenues	$ 548	$ 1,101	$ 2,510	$ 3,033
Revenues percentage	42.00%	57.00%	50.00%	49.00%
Japan [Member]
Summary of net revenues by geographic region
Total revenues	$ 498	$ 623	$ 1,515	$ 2,119
Revenues percentage	38.00%	32.00%	30.00%	34.00%
Germany [Member]
Summary of net revenues by geographic region
Total revenues	$ 106	$ 195	$ 477	$ 604
Revenues percentage	8.00%	10.00%	9.00%	10.00%
China [Member]
Summary of net revenues by geographic region
Total revenues	$ 49	$ (67)	$ 177	$ 130
Revenues percentage	4.00%	(3.00%)	4.00%	2.00%
Taiwan [Member]
Summary of net revenues by geographic region
Total revenues	$ 13	$ 49	$ 31	$ 159
Revenues percentage	1.00%	3.00%	1.00%	3.00%
Singapore [Member]
Summary of net revenues by geographic region
Total revenues			$ 2
Revenues percentage
Sweden [Member]
Summary of net revenues by geographic region
Total revenues	$ 7		$ 6	$ 10
Revenues percentage	1.00%
Canada [Member]
Summary of net revenues by geographic region
Total revenues			$ 7
Revenues percentage
South Korea [Member]
Summary of net revenues by geographic region
Total revenues	$ 4		$ 8
Revenues percentage
Switzerland [Member]
Summary of net revenues by geographic region
Total revenues	$ 52		$ 109
Revenues percentage	4.00%		2.00%
France [Member]
Summary of net revenues by geographic region
Total revenues			$ 152
Revenues percentage			3.00%
India [Member]
Summary of net revenues by geographic region
Total revenues	$ 32		$ 32
Revenues percentage	2.00%		1.00%
Spain [Member]
Summary of net revenues by geographic region
Total revenues			$ 6
Revenues percentage
Other [Member]
Summary of net revenues by geographic region
Total revenues	$ 1	$ 22	$ (1)	$ 119
Revenues percentage		1.00%		2.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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