Financing (Details 4) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ 289	$ 1,841
Series C Convertible Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	270	1,712
Series D Convertible Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	19	123
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	6
Debentures 2008 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0
Debentures 2009 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0
Debentures 2010 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0
Debentures 2011 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	0	0
Debentures 2012 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ 0	$ 0