Net Loss Per Share (Schedule Of Anti-Dilutive Securities Excluded From Computation Of Diluted Earnings Per Share) (Details) - shares	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	79,410,284	78,138,047
Stock Options And Stock Appreciation Rights [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	413,301	671,887
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	39,537,501	37,335,618
Restricted Stock Units [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	680,363	1,167,099
Warrants [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive common shares excluded from the computation of diluted earnings per share	38,779,119	38,963,443