Fair Value Measurements (Summary Of Changes In Fair Value Of Level 3 Financial Liabilities) (Details)	3 Months Ended
	Mar. 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	(3,129,308)
Balance at end of period	16,657,699
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	(53,350)
Balance at end of period	12,731
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	(48,266)
Balance at end of period	103,429
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
Revaluation	(3,027,692)
Balance at end of period	$ 16,541,539