Financing (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Fair value adjustments:
Compound embedded derivatives	$ (107)	$ (55)	$ (244)	$ (1,998)
Warrant derivatives	(207)	(258)	(580)	(3,424)
Hybrid instruments	628	433	1,173	(24,054)
Debt Extinguishment	(4,247)	0	(4,247)	0
Fair Value, Inputs, Level 3 [Member]
Statement [Line Items]
Beginning balance, December 31, 2013:			39,166
Fair value adjustments:
Compound embedded derivatives			(244)
Warrant derivatives			(580)
Hybrid instruments			1,173
Debt Extinguishment			(4,247)
Conversions:
Series D Preferred Stock			(1)
August 24, 2006 financing			(60)
December 29, 2006 financing			(48)
March 27, 2007 financing			(20)
October 28, 2008 financing			(30)
August 14, 2009 financing			(44)
February 8, 2011 financing			(14)
March 11, 2011 financing			(11)
April 13, 2011 financing			(3)
May 31, 2011 financing			(1)
June 28, 2011 financing			(3)
Ending balance, June 30, 2014	35,033		35,033
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			(244)
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, June 30, 2014	51		51
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			(580)
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, June 30, 2014	40		40
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			1,173
Debt Extinguishment			(4,247)
Conversions:
Series D Preferred Stock			0
August 24, 2006 financing			(60)
December 29, 2006 financing			(48)
March 27, 2007 financing			(20)
October 28, 2008 financing			(30)
August 14, 2009 financing			(44)
February 8, 2011 financing			(14)
March 11, 2011 financing			(11)
April 13, 2011 financing			(3)
May 31, 2011 financing			(1)
June 28, 2011 financing			(3)
Ending balance, June 30, 2014	$ 34,942		$ 34,942