Financing (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	$ 289	$ 42,409	$ 3,411	$ 921
Series D Preferred Stock [Member]
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	51	6,819	659	(52)
Warrants With Debenture Attached Series 2007 [Member]
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	0	4,356	0	1,019
Warrants With Debenture Attached Series 2008 [Member]
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	137	19,093	1,561	550
Warrants With Debenture Attached Series 2010 [Member]
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	48	6,525	528	183
Warrants With Debenture Attached Series 2011 [Member]
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	33	4,578	420	1
Warrants With Debenture Attached Series 2012 [Member]
Debt Conversion [Line Items]
(Gain) loss from change in fair value of derivative liability - warrants	$ 20	$ 1,038	$ 243	$ (780)