Financing (Details 6) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	$ 154	$ (1,369)	$ (3,077)	$ (2,542)
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	8	(83)	(169)	(144)
Debentures 2007 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	3	(35)	(70)	(49)
Debentures 2008 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	8	(82)	(165)	(140)
Debentures 2009 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	0	(1)	0	(6)
Debentures 2011 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	3	(35)	(69)	(61)
Debentures 2012 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	4	(41)	(84)	(86)
Debentures 2013 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	127	(1,092)	(2,508)	(2,056)
Debentures 2014 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	$ 1	$ 0	$ (12)	$ 0