Financing (Details 10) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Change in fair value of derivative liability - warrants	$ 4,897	$ 568	$ 5,818	$ 2,263
Series C Preferred Stock [Member]
Change in fair value of derivative liability - warrants	0	0	0	53
Series D Preferred Stock [Member]
Change in fair value of derivative liability - warrants	847	42	795	220
Warrants With Debenture Attached Series 2006 [Member]
Change in fair value of derivative liability - warrants	0	54	0	181
Warrants With Debenture Attached Series 2007 [Member]
Change in fair value of derivative liability - warrants	492	40	1,511	169
Warrants With Debenture Attached Series 2008 [Member]
Change in fair value of derivative liability - warrants	2,107	95	2,657	478
Warrants With Debenture Attached Series 2010 [Member]
Change in fair value of derivative liability - warrants	718	163	901	831
Warrants With Debenture Attached Series 2011 [Member]
Change in fair value of derivative liability - warrants	565	174	566	331
Warrants With Debenture Attached Series 2012 [Member]
Change in fair value of derivative liability - warrants	$ 168	$ 0	$ (612)	$ 0