Property, Plant and Equipment (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Property, Plant and Equipment
Property, plant and equipment, gross	$ 2,269	$ 2,248
Less: Accumulated depreciation	2,137	2,102
Property, plant and equipment, net	132	146
Leasehold improvements
Property, Plant and Equipment
Property, plant and equipment, gross	32	32
Computers and related software
Property, Plant and Equipment
Property, plant and equipment, gross	1,276	1,281
Machinery and equipment
Property, Plant and Equipment
Property, plant and equipment, gross	842	810
Office furniture and fixtures
Property, Plant and Equipment
Property, plant and equipment, gross	$ 119	$ 125