Fair Value Measurements (Summary Of Changes In Fair Value Of Level 3 Financial Liabilities) (Details)	12 Months Ended
	Dec. 31, 2017 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 19,787,007
Issues
Settlements
Revaluation	(212,030)
Balance at end of period	19,574,977
Warrants Issued May 2012 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	66,081
Issues
Settlements
Revaluation	(66,081)
Warrants Issued August 2013 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	151,695
Issues
Settlements
Revaluation	(145,949)
Balance at end of period	5,746
Warrants Issued September 2016 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	19,569,231
Issues
Settlements
Balance at end of period	$ 19,569,231