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Intangible Assets (Narrative) (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Amortization expense, remainder of 2018 $ 38,000  
Amortization expense, 2019 137,000  
Amortization expense, 2020 106,000  
Amortization expense, 2021 32,000  
Amortization expense, 2022 9,000  
Amortization expense, 2023 9,000  
Net $ 333,000 $ 380,000