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5. Property, Plant and Equipment (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 2,024 $ 2,024
Less: Accumulated depreciation 1,891 1,864
Property, plant and equipment, net 133 160
Leasehold improvements [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 39 39
Computers and related software [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 1,075 1,068
Machinery and equipment [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross 885 892
Office furniture and fixtures [Member]    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, gross $ 25 $ 25