Financing (Details 9) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Fair value adjustments:
Compound embedded derivatives	$ (5)	$ (137)
Warrant derivatives	1	(373)
Hybrid instruments	1,515	545
Fair Value, Inputs, Level 3 [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:	37,392
Fair value adjustments:
Compound embedded derivatives	(5)
Warrant derivatives	1
Hybrid instruments	1,515
Conversions:
Series C Preferred Stock	0
August 24, 2006 financing	(12)
December 29, 2006 financing	0
March 27, 2007 financing	0
October 28, 2008 financing	0
August 14, 2009 financing	(16)
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
December 8, 2011 financing	0
July 1, 2013 financing	0
Sep 15, 2014 financing	(20)
Ending balance, March 31, 2015	38,855
Fair Value, Inputs, Level 3 [Member] \| Compound embedded derivatives [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:	6
Fair value adjustments:
Compound embedded derivatives	(5)
Warrant derivatives	0
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
March 11, 2011 financing	0
April 13, 2011 financing	0
May 31, 2011 financing	0
June 28, 2011 financing	0
December 8, 2011 financing	0
July 1, 2013 financing	0
Sep 15, 2014 financing	0
Ending balance, March 31, 2015	1
Fair Value, Inputs, Level 3 [Member] \| Warrant derivatives [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:	2
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	1
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
March 11, 2011 financing	0
April 13, 2011 financing	0
May 31, 2011 financing	0
June 28, 2011 financing	0
December 8, 2011 financing	0
July 1, 2013 financing	0
Sep 15, 2014 financing	0
Ending balance, March 31, 2015	3
Fair Value, Inputs, Level 3 [Member] \| Hybrid instruments [Member]
Debt Conversion [Line Items]
Beginning balance, December 31, 2014:	37,384
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	0
Hybrid instruments	1,515
Conversions:
Series C Preferred Stock	0
August 24, 2006 financing	(12)
December 29, 2006 financing	0
March 27, 2007 financing	0
October 28, 2008 financing	0
August 14, 2009 financing	(16)
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
December 8, 2011 financing	0
July 1, 2013 financing	0
Sep 15, 2014 financing	(20)
Ending balance, March 31, 2015	$ 38,851

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