Financing (Details 4) (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]
Gain (loss) from change in fair value of derivative liability	$ (2,620)	$ 1,036	$ (4,769)	$ (13,262)
Series C Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	(2,473)	918	(4,462)	(2,284)
Series D Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	(178)	44	(322)	(1,302)
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	31	74	15	(2,996)
Debentures 2008 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0	0	(1,350)
Debentures 2009 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0	0	(486)
Debentures 2010 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0	0	(34)
Debentures 2011 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0	0	(4,825)
Debentures 2012 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ 0	$ 0	$ 0	$ 15