Annual report pursuant to Section 13 and 15(d)

Warrants (Schedule Of Unrealized Gain/(Loss) On Fair Value Of Warrants) (Details)

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Warrants (Schedule Of Unrealized Gain/(Loss) On Fair Value Of Warrants) (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants $ 3,986,727 $ (5,180,107) $ (1,365,654)
Exercised And Expired Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants   (277,769) 104,887
March 31, 2011 Warrants To Institutional Investors [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 319,247 (7,917) (5,027)
December 4, 2012 Warrants To Institutional Investors [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 70,856 (4,120,103) (1,598,195)
December 4, 2012 Warrants To Placement Agent [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 13,389 (514,881) (75,062)
July 26, 2013 Warrants To Institutional Investors [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 666,894 (1,272,731) 147,562
July 26, 2013 Warrants To Placement Agent [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 30,210 (234,877) 26,681
October 16, 2013 Warrants To Institutional Investors [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 780,407 (940,100) 18,739
October 16, 2013 Warrants To Placement Agent [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 95,593 (23,956) $ 14,761
January 21, 2014 Warrants To Institutional Investors [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 1,347,724 $ 2,212,227  
November 12, 2015 Warrants To Institutional Investors [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants 623,125    
November 12, 2015 Warrants To Placement Agent [Member]      
Class of Warrant or Right [Line Items]      
Unrealized gain (loss) on fair value of warrants $ 39,282