Financing (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
(Gain) loss from change in fair value of derivative liability - warrants	$ 3,122	$ (41,488)
Series D Preferred Stock [Member]
(Gain) loss from change in fair value of derivative liability - warrants	608	(6,871)
Warrants With Debenture Attached Series 2007 [Member]
(Gain) loss from change in fair value of derivative liability - warrants	0	(3,337)
Warrants With Debenture Attached Series 2008 [Member]
(Gain) loss from change in fair value of derivative liability - warrants	1,424	(18,543)
Warrants With Debenture Attached Series 2010 [Member]
(Gain) loss from change in fair value of derivative liability - warrants	480	(6,342)
Warrants With Debenture Attached Series 2011 [Member]
(Gain) loss from change in fair value of derivative liability - warrants	387	(4,577)
Warrants With Debenture Attached Series 2012 [Member]
(Gain) loss from change in fair value of derivative liability - warrants	$ 223	$ (1,818)