Financing (Details 4) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ 137	$ 1,943
Series C Convertible Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	128	1,798
Series D Convertible Preferred Stock [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	9	129
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from change in fair value of derivative liability	$ 0	$ 16