Fair Value Measurements (Assets And Liabilities Measured At Fair Value On Recurring Basis By Level) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued		$ 19,574,977
Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total liabilities at fair value		19,574,977
Recurring [Member] | Warrants Issued May 2012 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued
Recurring [Member] | Warrants Issued August 2013 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued		5,746
Recurring [Member] | Warrants Issued September 2016 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrants issued		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]
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]
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]
Total liabilities at fair value		19,574,977
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
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		5,746
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		$ 19,569,231