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4. Property and Equipment (Details Narrative) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Property, Plant and Equipment [Abstract]        
Depreciation expense $ 4,000 $ 6,000 $ 21,000 $ 11,000