Fair Value Measurements And Derivative Instruments (Reconciliation Of Fair Value Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ 8,759
Fair value, end of period	1,613
Series C Preferred Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	6,271
Warrant Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	2,411
Level 3 [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	8,682	$ 20,337
Net (gains) losses recognized in earnings	(6,261)	$ (4,823)
Purchases and issuances	1,012
Sales and settlements	$ (1,423)
Gross transfers into Level 3
Gross transfers out of Level 3	$ (611)
Fair value, end of period	$ 1,399	$ 15,514
Total unrealized (gains) losses during the period included in earnings related to instruments held at end of period		(4,823)
Level 3 [Member] | Series C Preferred Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ 6,271	13,804
Net (gains) losses recognized in earnings	$ (4,848)	$ (2,883)
Purchases and issuances
Sales and settlements	$ (1,423)
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period		$ 10,921
Total unrealized (gains) losses during the period included in earnings related to instruments held at end of period		(2,883)
Level 3 [Member] | Warrant Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ 2,411	6,533
Net (gains) losses recognized in earnings	$ (1,800)	$ (1,940)
Purchases and issuances
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3	$ (611)
Fair value, end of period		$ 4,593
Total unrealized (gains) losses during the period included in earnings related to instruments held at end of period		$ (1,940)
Level 3 [Member] | Convertible Debt [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period
Net (gains) losses recognized in earnings	$ 387
Purchases and issuances	$ 1,012
Sales and settlements
Gross transfers into Level 3
Gross transfers out of Level 3
Fair value, end of period	$ 1,399
Total unrealized (gains) losses during the period included in earnings related to instruments held at end of period	$ 387