Financing (Details 10) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2013	Mar. 31, 2012
Beginning balance, December 31, 2012	$ 70,126
Fair value adjustments:
Compound embedded derivatives	6,774	(89,649)
Warrant derivatives	3,122	(41,488)
Hybrid instruments	(299)	(31,170)
Conversions:
August 24, 2006 financing	(516)
December 29, 2006 financing	(503)
March 27, 2007 financing	(190)
July 15, 2009 financing	(614)
August 14, 2009 financing	(192)
April 13, 2011 financing	(199)
October 25, 2011 financing	(37)
December 8, 2011 financing	(217)
March 26, 2012 financing	(141)
June 1, 2012 financing	(506)
Ending balance, March 31, 2013	57,414
Embedded Derivative Financial Instruments [Member]
Beginning balance, December 31, 2012	2,147
Fair value adjustments:
Compound embedded derivatives	299
Warrant derivatives	0
Hybrid instruments	0
Conversions:
August 24, 2006 financing	0
December 29, 2006 financing	0
March 27, 2007 financing	0
July 15, 2009 financing	0
August 14, 2009 financing	0
April 13, 2011 financing	0
October 25, 2011 financing	0
December 8, 2011 financing	0
March 26, 2012 financing	0
June 1, 2012 financing	0
Ending balance, March 31, 2013	2,446
Warrant [Member]
Beginning balance, December 31, 2012	3,687
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	(3,122)
Hybrid instruments	0
Conversions:
August 24, 2006 financing	0
December 29, 2006 financing	0
March 27, 2007 financing	0
July 15, 2009 financing	0
August 14, 2009 financing	0
April 13, 2011 financing	0
October 25, 2011 financing	0
December 8, 2011 financing	0
March 26, 2012 financing	0
June 1, 2012 financing	0
Ending balance, March 31, 2013	565
Hybrid Instrument [Member]
Beginning balance, December 31, 2012	64,292
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	0
Hybrid instruments	(6,774)
Conversions:
August 24, 2006 financing	(516)
December 29, 2006 financing	(503)
March 27, 2007 financing	(190)
July 15, 2009 financing	(614)
August 14, 2009 financing	(192)
April 13, 2011 financing	(199)
October 25, 2011 financing	(37)
December 8, 2011 financing	(217)
March 26, 2012 financing	(141)
June 1, 2012 financing	(506)
Ending balance, March 31, 2013	$ 54,403

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