Financing (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Fair value adjustments:
Compound embedded derivatives	$ (29)	$ (31)	$ (273)	$ (2,029)
Warrant derivatives	(38)	(90)	(618)	(3,514)
Hybrid instruments	1,369	(4,495)	2,542	(28,549)
Debt Extinguishment	0	(53)	(4,247)	(53)
Fair Value, Inputs, Level 3 [Member]
Statement [Line Items]
Beginning balance, December 31, 2013:			39,166
Fair value adjustments:
Compound embedded derivatives			(273)
Warrant derivatives			(618)
Hybrid instruments			2,542
Debt Extinguishment			(4,247)
Conversions:
Series D Preferred Stock			(1)
August 24, 2006 financing			(195)
December 29, 2006 financing			(61)
March 27, 2007 financing			(97)
October 28, 2008 financing			(148)
August 14, 2009 financing			(133)
February 8, 2011 financing			(35)
March 11, 2011 financing			(11)
April 13, 2011 financing			(3)
May 31, 2011 financing			(1)
June 28, 2011 financing			(3)
December 8, 2011 financing			(30)
July 1, 2013 financing			(40)
Ending balance, September 30, 2014	35,812		35,812
Fair Value, Inputs, Level 3 [Member] | Embedded Derivative Financial Instruments [Member]
Statement [Line Items]
Beginning balance, December 31, 2013:			296
Fair value adjustments:
Compound embedded derivatives			(273)
Warrant derivatives			0
Hybrid instruments			0
Conversions:
Series D Preferred Stock			(1)
August 24, 2006 financing			0
December 29, 2006 financing			0
March 27, 2007 financing			0
October 28, 2008 financing			0
August 14, 2009 financing			0
February 8, 2011 financing			0
March 11, 2011 financing			0
April 13, 2011 financing			0
May 31, 2011 financing			0
June 28, 2011 financing			0
Ending balance, September 30, 2014	22		22
Fair Value, Inputs, Level 3 [Member] | Warrant [Member]
Statement [Line Items]
Beginning balance, December 31, 2013:			620
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			(618)
Hybrid instruments			0
Conversions:
Series D Preferred Stock			0
August 24, 2006 financing			0
December 29, 2006 financing			0
March 27, 2007 financing			0
October 28, 2008 financing			0
August 14, 2009 financing			0
February 8, 2011 financing			0
March 11, 2011 financing			0
April 13, 2011 financing			0
May 31, 2011 financing			0
June 28, 2011 financing			0
Ending balance, September 30, 2014	2		2
Fair Value, Inputs, Level 3 [Member] | Hybrid Instrument [Member]
Statement [Line Items]
Beginning balance, December 31, 2013:			38,250
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			0
Hybrid instruments			2,542
Debt Extinguishment			(4,247)
Conversions:
Series D Preferred Stock			0
August 24, 2006 financing			(195)
December 29, 2006 financing			(61)
March 27, 2007 financing			(97)
October 28, 2008 financing			(148)
August 14, 2009 financing			(133)
February 8, 2011 financing			(35)
March 11, 2011 financing			(11)
April 13, 2011 financing			(3)
May 31, 2011 financing			(1)
June 28, 2011 financing			(3)
December 8, 2011 financing			(30)
July 1, 2013 financing			(40)
Ending balance, September 30, 2014	$ 35,788		$ 35,788