Annual report pursuant to Section 13 and 15(d)

Warrants (Summary Of Warrants Outstanding) (Details)

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Warrants (Summary Of Warrants Outstanding) (Details) - $ / shares
 12 Months Ended
Dec. 31, 2018
Oct. 19, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]      
Number of Warrants 12,783,262   7,099,609
Exercise Price   $ 1.625  
Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 6,667,877   7,099,609
Equity-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 6,115,385.00  
July 2013 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants     200,000
Exercise Price $ 5.90    
Expiration Date 2018-07    
October 2013 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants     231,732
Exercise Price $ 5.75    
Expiration Date 2018-10    
January 2014 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 476,193   476,193
Exercise Price $ 12.80    
Expiration Date 2019-01    
November 2015 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 1,250,001   1,250,001
Exercise Price $ 5.30    
Expiration Date 2021-05    
November 2015 Placement Agent Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 3,334   3,334
Exercise Price $ 5.30    
Expiration Date 2020-11    
March 2016 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 607,806   607,806
Exercise Price $ 4.20    
Expiration Date 2021-09    
September 2016 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 805,000   805,000
Exercise Price $ 3.00    
Expiration Date 2022-03    
June 2017 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 1,515,152   1,515,152
Exercise Price $ 4.00    
Expiration Date 2022-12    
June 2017 Placement Agent Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 181,818   181,818
Exercise Price $ 4.13    
Expiration Date 2022-06    
October 2017 Investor Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 1,632,654   1,632,654
Exercise Price $ 2.85    
Expiration Date 2023-04    
October 2017 Placement Agent Warrants [Member] | Liability-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 195,919   195,919
Exercise Price $ 3.06    
Expiration Date 2022-10    
October 2018 Investor Warrants [Member] | Equity-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 5,769,231    
Exercise Price $ 1.67    
Expiration Date 2024-04    
October 2018 Placement Agent Warrants [Member] | Equity-Classified Warrants [Member]      
Class of Warrant or Right [Line Items]      
Number of Warrants 346,154    
Exercise Price $ 1.63    
Expiration Date 2023-10