Quarterly report pursuant to Section 13 or 15(d)

Warrants (Schedule Of Fair Value Of Warrants Issued) (Details)

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Warrants (Schedule Of Fair Value Of Warrants Issued) (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Class of Warrant or Right [Line Items]    
Fair value $ 4,487,139 $ 7,853,635
July 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value   8,762
October 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 6 26,288
January 2014 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 20 29,257
November 2015 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 619,096 1,260,050
November 2015 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 1,358 2,936
March 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 370,100 697,554
September 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 619,708 1,054,083
June 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 1,158,693 1,981,864
June 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 124,282 221,591
October 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value 1,433,206 2,305,552
October 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Fair value $ 160,670 $ 265,698