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4. Property and Equipment (Details) - USD ($)
Dec. 31, 2016
Dec. 31, 2015
Property and equipment, gross $ 49,000 $ 82,000
Less: accumulated depreciation (32,000) (60,000)
Property and equipment, net 17,000 22,000
Office equipment [Member]    
Property and equipment, gross 28,000 65,000
Furniture and fixtures [Member]    
Property and equipment, gross 3,000 4,000
Testing equipment [Member]    
Property and equipment, gross $ 18,000 $ 13,000