Quarterly report pursuant to Section 13 or 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 ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants $ 1,558,760 $ 3,665,365 $ 1,674,175 $ (7,995,159)
Exercised And Expired Warrants [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants   434,420   (309,881)
March 31, 2011 Warrants To Institutional Investors [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 202,963 725,883 305,040 (748,090)
December 4, 2012 Warrants To Institutional Investors [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 32,568 55,683 29,671 (4,170,019)
December 4, 2012 Warrants To Placement Agent [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 5,434 9,359 5,577 (523,891)
July 26, 2013 Warrants To Institutional Investors [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 289,146 501,262 264,360 (1,699,355)
July 26, 2013 Warrants To Placement Agent [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 15,209 28,959 19,554 (264,579)
October 16, 2013 Warrants To Institutional Investors [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 323,698 604,836 305,938 (1,435,140)
October 16, 2013 Warrants To Placement Agent [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants 48,918 95,196 64,097 (122,066)
January 21, 2014 Warrants To Institutional Investors [Member]        
Class of Warrant or Right [Line Items]        
Unrealized gain (loss) on fair value of warrants $ 640,824 $ 1,209,767 $ 679,938 $ 1,277,862