Warrants (Summary Of Changes In Warrants Outstanding During The Period) (Details) - $ / shares		6 Months Ended
	Jan. 25, 2019	Jun. 30, 2019
Class of Warrant or Right [Line Items]
Number of warrants, Outstanding		1,065,286
Number of warrants, issued	895,886	895,886
Number of warrants, Exercised
Number of warrants, Expired		(39,683)
Number of warrants, Outstanding		1,921,489
Weigted average exercise price, Outstanding		$ 37.52
Weighted average exercise price, Issued		9.60
Weighted average exercise price, Exercised
Weighted average exercise price, Expired		153.60
Weigted average exercise price, Outstanding		$ 22.10
Liability-Classified Warrants [Member]
Class of Warrant or Right [Line Items]
Number of warrants, Outstanding		555,667
Number of warrants, Exercised
Number of warrants, Expired		(39,683)
Number of warrants, Outstanding		515,984
Equity-Classified Warrants [Member]
Class of Warrant or Right [Line Items]
Number of warrants, Outstanding		509,619
Number of warrants, issued		895,886
Number of warrants, Exercised
Number of warrants, Outstanding		1,405,505