Financing (Details 6) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	$ (1,716)	$ (628)	$ (3,231)	$ (1,173)
Debentures 2006 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	(94)	(170)	(177)	(61)
Debentures 2007 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	(39)	(71)	(73)	(14)
Debentures 2008 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	(92)	(145)	(173)	(58)
Debentures 2009 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	0	(13)	0	(5)
Debentures 2011 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	(38)	(94)	(72)	(26)
Debentures 2012 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	(47)	(34)	(88)	(45)
Debentures 2013 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	(1,399)	(101)	(2,635)	(964)
Debentures 2014 Series [Member]
Debt Conversion [Line Items]
Gain (loss) from changes in fair value of hybrid instruments	$ (7)	$ 0	$ (13)	$ 0