Financing (Details 8) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Debt Conversion [Line Items]
Warrant derivatives	$ 92	$ 4,897	$ 3,503	$ 5,818
Series D Preferred Stock [Member]
Debt Conversion [Line Items]
Warrant derivatives	16	847	675	795
Warrants with Debenture Attached Series 2007 [Member]
Debt Conversion [Line Items]
Warrant derivatives	0	492	0	1,511
Warrants with Debenture Attached Series 2008 [Member]
Debt Conversion [Line Items]
Warrant derivatives	44	2,107	1,605	2,657
Warrants with Debenture Attached Series 2010 [Member]
Debt Conversion [Line Items]
Warrant derivatives	15	718	543	901
Warrants with Debenture Attached Series 2011 [Member]
Debt Conversion [Line Items]
Warrant derivatives	11	565	431	566
Warrants with Debenture Attached Series 2012 [Member]
Debt Conversion [Line Items]
Warrant derivatives	$ 6	$ 168	$ 249	$ (612)