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Income Taxes (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Income Taxes [Abstract]          
Income tax (benefit) expense $ 0 $ 0 $ (393) $ 5  
Valuation allowance carried against net deferred tax assets 37,000   37,000   $ 36,000
Federal [Member]          
Income Taxes [Abstract]          
Net operating loss carryforwards 127,000   $ 127,000    
Federal [Member] | Earliest Tax Year [Member]          
Income Taxes [Abstract]          
Operating loss carryforwards, expiration dates     Dec. 31, 2027    
State [Member]          
Income Taxes [Abstract]          
Net operating loss carryforwards $ 108,000   $ 108,000    
State [Member] | Earliest Tax Year [Member]          
Income Taxes [Abstract]          
Operating loss carryforwards, expiration dates     Dec. 31, 2028