Fair Value Measurements (Schedule Of Assets Or Liabilities Measured On Recurring Basis) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	$ 15,514	$ 3,943	$ 20,337	$ 5,907
Net unrealized (gains) losses, included in other income (loss)	4,710	11,718	(113)	9,603
Purchases and issuances	0	0	0	151
Sales and settlements, included in derivative gain (loss)	0	(151)	0	(151)
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	20,224	15,510	20,224	15,510
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	4,710	11,718	(113)	9,603
Series C Preferred Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	10,921	2,551	13,804	3,761
Net unrealized (gains) losses, included in other income (loss)	3,288	7,746	405	6,536
Purchases and issuances	0	0	0	0
Sales and settlements, included in derivative gain (loss)	0	0	0	0
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	14,209	10,297	14,209	10,297
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	3,288	7,746	405	6,536
Warrant derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	4,593	1,241	6,533	2,146
Net unrealized (gains) losses, included in other income (loss)	1,422	3,972	(518)	3,067
Purchases and issuances	0	0	0	0
Sales and settlements, included in derivative gain (loss)	0	0	0	0
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	6,015	5,213	6,015	5,213
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	1,422	3,972	(518)	3,067
Conversion Loan Embedded Derivative [Member]
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Fair value, beginning of period	0	151	0	0
Net unrealized (gains) losses, included in other income (loss)	0	0	0	0
Purchases and issuances	0	0	0	151
Sales and settlements, included in derivative gain (loss)	0	(151)	0	(151)
Gross transfers in	0	0	0	0
Gross transfers out	0	0	0	0
Fair value, end of period	0	0	0	0
Changes in realized (gains) losses included in income on instruments held at end of period	0	0	0	0
Changes in unrealized (gains) losses included in income on instruments held at end of period	$ 0	$ 0	$ 0	$ 0