Segment Information (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Product Information [Line Items]
Total revenue	$ 3,526	$ 3,878
Core [Member]
Product Information [Line Items]
Total revenue	9	41
Optical [Member]
Product Information [Line Items]
Total revenue	3,338	3,781
Research and Development [Member]
Product Information [Line Items]
Total revenue		56
Rubicon DTP [Member]
Product Information [Line Items]
Total revenue	$ 179