Fair Value Measurements (Summary Of Changes In Fair Value Of Level 3 Financial Liabilities) (Details)	6 Months Ended
	Jun. 30, 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	(3,429,563)
Balance at end of period	16,357,444
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	(64,262)
Balance at end of period	1,819
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	(116,070)
Balance at end of period	35,625
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	(3,249,231)
Balance at end of period	$ 16,320,000