Quarterly report pursuant to Section 13 or 15(d)

Warrants (Summary Of Shares Indexed To The Warrants) (Details)

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Warrants (Summary Of Shares Indexed To The Warrants) (Details) - shares
Jun. 30, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Number of shares indexed 7,099,609 7,099,609
July 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 200,000 200,000
October 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 231,732 231,732
January 2014 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 476,193 476,193
November 2015 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 1,250,001 1,250,001
November 2015 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 3,334 3,334
March 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 607,806 607,806
September 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 805,000 805,000
June 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 1,515,152 1,515,152
June 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 181,818 181,818
October 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 1,632,654 1,632,654
October 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Number of shares indexed 195,919 195,919