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
Mar. 31, 2018
Mar. 31, 2017
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants $ 3,366,496 $ (17,689,580)
Expired And Fully Exercised Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants   (814,903)
July 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 8,762 (549,380)
October 2013 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 26,282 (677,210)
January 2014 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 29,237 (1,081,810)
November 2015 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 640,954 (4,119,750)
November 2015 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 1,578 (271,825)
March 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 327,454 (3,932,511)
September 2016 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 434,375 $ (6,242,191)
June 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 823,171  
June 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 97,309  
October 2017 Investor Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants 872,346  
October 2017 Placement Agent Warrants [Member]    
Class of Warrant or Right [Line Items]    
Unrealized gain (loss) on fair value of warrants $ 105,028