Financing (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ (21,469)	$ (13,035)
Series C Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	(20,036)	(2,066)
Series D Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	(1,448)	(1,286)
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	15	(3,005)
Debentures 2008 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	(1,350)
Debentures 2009 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	(484)
Debentures 2010 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	(34)
Debentures 2011 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	(4,825)
Debentures 2012 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ 0	$ 15