Geographic Segment Information (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Revenues
Revenues	$ 16,421	$ 18,060	$ 25,045	$ 21,663	$ 18,810	$ 18,096	$ 24,199	$ 24,882	$ 81,189	$ 85,987	$ 76,070
Property and Equipment, net
Property and Equipment, net	16,183				13,868				16,183	13,868
North America [Member]
Revenues
Revenues									45,033	52,101	42,815
Europe [Member]
Revenues
Revenues									17,513	18,102	15,604
Asia [Member]
Revenues
Revenues									18,643	15,784	17,651
United States [Member]
Property and Equipment, net
Property and Equipment, net	191				185				191	185
Taiwan [Member]
Property and Equipment, net
Property and Equipment, net	9,016				8,568				9,016	8,568
China [Member]
Property and Equipment, net
Property and Equipment, net	$ 6,976				$ 5,115				6,976	5,115
Connectivity Products [Member]
Revenues
Revenues									61,282	64,791	57,660
Optical Passive Products [Member]
Revenues
Revenues									$ 19,907	$ 21,196	$ 18,410