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, 2017
Dec. 31, 2016
Dec. 31, 2015
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants $ (7,594,162) $ 5,529,907 $ 3,986,727
Expired Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants   2,590 458,439
December 2012 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants 49 9,769 70,856
July 2013 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (6,702) 119,360 666,894
October 2013 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (22,580) 165,641 780,407
January 2014 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (28,543) 130,762 1,347,724
November 2015 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (999,550) 1,908,875 623,125
November 2015 Placement Agent Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (365,748) 121,593 $ 39,282
March 2016 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (2,708,163) 2,060,977  
March 2016 Placement Agent Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (351,899) 134,617  
September 2016 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (4,571,872) 816,480  
September 2016 Placement Agent Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants (503,150) $ 59,243  
June 2017 Investor Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants 1,691,304    
June 2017 Placement Agent Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants 212,729    
October 2017 Investor Warrants      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants 54,907    
October 2017 Placement Agent Warrants [Member]      
Class of Warrant or Right [Line Items]      
Unrealized (loss) gain on fair value of warrants $ 5,056