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Income Taxes (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Operating Loss Carryforwards [Line Items]      
Provision for income taxes  
Operating loss carry-forward 151,071,000   $ 147,086,000
Federal And State [Member]      
Operating Loss Carryforwards [Line Items]      
Provision for income taxes $ 0 $ 0