Financing (Details 10) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Adjustment for change in fair value of derivative liability- warrants	$ 11,347	$ (12,223)
Series C Preferred Stock [Member]
Adjustment for change in fair value of derivative liability- warrants	0	53
Series D Preferred Stock [Member]
Adjustment for change in fair value of derivative liability- warrants	1,826	(2,280)
Warrants With Debenture Attached Series 2006 [Member]
Adjustment for change in fair value of derivative liability- warrants	0	185
Warrants With Debenture Attached Series 2007 [Member]
Adjustment for change in fair value of derivative liability- warrants	1,510	(1,316)
Warrants With Debenture Attached Series 2008 [Member]
Adjustment for change in fair value of derivative liability- warrants	5,185	(6,317)
Warrants With Debenture Attached Series 2010 [Member]
Adjustment for change in fair value of derivative liability- warrants	1,764	(1,368)
Warrants With Debenture Attached Series 2011 [Member]
Adjustment for change in fair value of derivative liability- warrants	1,233	(1,180)
Warrants With Debenture Attached Series 2012 [Member]
Adjustment for change in fair value of derivative liability- warrants	$ (171)	$ 0