Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis By Level) (Details) - USD ($)	Mar. 31, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Total assets at fair value
Warrants issued	$ 16,657,699	19,787,007
Total liabilities at fair value	16,657,699	19,787,007
Warrants Issued May 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued	12,731	66,081
Warrants Issued August 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued	103,429	151,695
Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued	16,541,539	19,569,231
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Total assets at fair value
Total liabilities at fair value
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member] | Recurring [Member] | Warrants Issued May 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member] | Recurring [Member] | Warrants Issued August 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Quoted Prices In Active Markets For Identical Instruments (Level 1) [Member] | Recurring [Member] | Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Total assets at fair value
Total liabilities at fair value
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Warrants Issued May 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Warrants Issued August 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Significant Other Observable Inputs (Level 2) [Member] | Recurring [Member] | Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents
Total assets at fair value
Total liabilities at fair value	16,657,699	19,787,007
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Warrants Issued May 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued	12,731	66,081
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Warrants Issued August 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued	103,429	151,695
Significant Unobservable Inputs (Level 3) [Member] | Recurring [Member] | Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued	$ 16,541,539	$ 19,569,231