Property and Equipment (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Property and Equipment [Abstract]
Machinery and equipment	$ 11,783	$ 11,657
Furniture fixtures and computer equipment	4,824	4,741
Leasehold improvements	3,894	3,854
Construction in progress	43	119
Property, plant and equipment, gross	20,544	20,371
Accumulated depreciation	(19,603)	(19,174)
Property and equipment, net	941	1,197
Depreciation	$ 429	$ 705