Financing (Details 10) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Change in fair value of derivative liability - warrants	$ 42,409	$ (87)	$ 921	$ 1,695
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	6,819	(11)	(52)	178
Warrants With Debenture Attached Series 2006 [Member]
Change in fair value of derivative liability - warrants	0	(13)	0	127
Warrants With Debenture Attached Series 2007 [Member]
Change in fair value of derivative liability - warrants	4,356	(14)	1,019	129
Warrants With Debenture Attached Series 2008 [Member]
Change in fair value of derivative liability - warrants	19,093	(25)	550	383
Warrants With Debenture Attached Series 2010 [Member]
Change in fair value of derivative liability - warrants	6,525	(43)	183	668
Warrants With Debenture Attached Series 2011 [Member]
Change in fair value of derivative liability - warrants	4,578	19	1	157
Warrants With Debenture Attached Series 2012 [Member]
Change in fair value of derivative liability - warrants	$ 1,038	$ 0	$ (780)	$ 0