Financing (Details 9) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013
Fair value adjustments:
Compound embedded derivatives	$ (289)	$ (1,841)
Warrant derivatives	(618)	(3,067)
Hybrid instruments	4,173	(21,809)
Debt Extinguishment	(4,247)	(53)
Fair Value, Inputs, Level 3 [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2013:	39,166
Fair value adjustments:
Compound embedded derivatives	(289)
Warrant derivatives	(618)
Hybrid instruments	4,173
Debt Extinguishment	(4,247)
Conversions:
Series C Preferred Stock	(1)
August 24, 2006 financing	(213)
December 29, 2006 financing	(61)
March 27, 2007 financing	(97)
October 28, 2008 financing	(155)
August 14, 2009 financing	(140)
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	(31)
July 1, 2013 financing	(40)
Sep 15, 2014 financing	(1)
Ending balance, December 31, 2014	37,392
Fair Value, Inputs, Level 3 [Member] \| Embedded Derivative Financial Instruments [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2013:	296
Fair value adjustments:
Compound embedded derivatives	(289)
Warrant derivatives	0
Hybrid instruments	0
Conversions:
Series C 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
April 13, 2011 financing	0
May 31, 2011 financing	0
December 8, 2011 financing	0
Sep 15, 2014 financing	0
Ending balance, December 31, 2014	6
Fair Value, Inputs, Level 3 [Member] \| Warrant [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2013:	620
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	(618)
Hybrid instruments	0
Conversions:
Series C 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
April 13, 2011 financing	0
May 31, 2011 financing	0
December 8, 2011 financing	0
Sep 15, 2014 financing	0
Ending balance, December 31, 2014	2
Fair Value, Inputs, Level 3 [Member] \| Hybrid Instrument [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2013:	38,250
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	0
Hybrid instruments	4,173
Debt Extinguishment	(4,247)
Conversions:
Series C Preferred Stock	0
August 24, 2006 financing	(213)
December 29, 2006 financing	(61)
March 27, 2007 financing	(97)
October 28, 2008 financing	(155)
August 14, 2009 financing	(140)
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	(31)
July 1, 2013 financing	(40)
Sep 15, 2014 financing	(1)
Ending balance, December 31, 2014	$ 37,384

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