Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Total	$ 45,585	$ 52,071
Less accumulated depreciation	(28,286)	(28,956)
Property, plant and equipment, net	17,299	23,115
Construction in progress	1,590	684
Property, plant and equipment, net plus construction in progress	18,889	23,799
Land [Member]
Property, Plant and Equipment [Line Items]
Total	339	372
Office buildings [Member]
Property, Plant and Equipment [Line Items]
Expected Life	39 years
Total	3,709	4,012
Production facilities [Member]
Property, Plant and Equipment [Line Items]
Total	9,345	9,209
Production facilities [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Expected Life	10 years
Production facilities [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Expected Life	20 years
Machinery and equipment [Member]
Property, Plant and Equipment [Line Items]
Total	30,683	36,944
Machinery and equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Expected Life	3 years
Machinery and equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Expected Life	15 years
Furniture and fixtures [Member]
Property, Plant and Equipment [Line Items]
Total	$ 1,509	$ 1,534
Furniture and fixtures [Member] | Minimum [Member]
Property, Plant and Equipment [Line Items]
Expected Life	3 years
Furniture and fixtures [Member] | Maximum [Member]
Property, Plant and Equipment [Line Items]
Expected Life	20 years