Segment Information (Details 1) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Product Information [Line Items]
Revenue	$ 1,269	$ 4,287
Optical [Member]
Product Information [Line Items]
Revenue	1,218	1,404
Core [Member]
Product Information [Line Items]
Revenue	15	441
Wafer [Member]
Product Information [Line Items]
Revenue	10	2,345
Research & development [Member]
Product Information [Line Items]
Revenue	$ 26	$ 97