Financing (Details 11) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Beginning balance, December 31, 2011:	$ 40,571
Issuances:
January 11, 2012	302
February 6, 2012	185
March 26, 2012	329
April 26, 2012	889
July 20, 2012	740
June 1, 2012	808
Fair value adjustments:
Compound embedded derivatives	(13,035)	15,715
Warrant derivatives	11,347	(12,223)
Hybrid instruments	11,926	5,351
Change to fair value option related to compound embedded derivative	0
Change to fair value option related to debenture carrying value	26,809
Less: Day-one loss from debenture financings	(1,162)	0
Extinguished	27,479
Repayments
June 1, 2012 financing	(28)
July 20, 2012 financing	(666)
Conversions:
August 24, 2006 financing	(1,666)
December 29, 2006 financing	(853)
March 27, 2007 financing	(1,047)
August 24, 2007 financing	(831)
October 28, 2008 financing	(383)
May 1, 2009 financing	(21)
July 15, 2009 financing	(637)
December 15, 2010 financing	(215)
January 10, 2011 financing	(267)
February 8, 2011 financing	(180)
March 11, 2011 financing	(788)
April 13, 2011 financing	(436)
May 31, 2011 financing	(885)
June 28, 2011 financing	(466)
July 13, 2011 financing	(1,656)
August 15, 2011 financing	(1,441)
September 15, 2011 financing	(1,458)
October 25, 2011 financing	(141)
December 8, 2011 financing	(209)
January 11, 2012 financing	(386)
March 26, 2012 financing	0
Ending balance, December 31, 2012	70,126	40,571
Series C Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives	(632)
Warrant derivatives	0	53
Hybrid instruments	0
Series D Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives	(1,294)
Warrant derivatives	1,826	(2,280)
Hybrid instruments	0
Embedded Derivative Financial Instruments [Member]
Beginning balance, December 31, 2011:	9,171
Issuances:
January 11, 2012	289
February 6, 2012	176
March 26, 2012	287
April 26, 2012	0
June 1, 2012	0
Fair value adjustments:
Compound embedded derivatives	(13,035)
Warrant derivatives	0
Hybrid instruments	0
Change to fair value option related to compound embedded derivative	(29,656)
Change to fair value option related to debenture carrying value	0
Less: Day-one loss from debenture financings	0
Extinguished	17,787
Repayments
June 1, 2012 financing	0
July 20, 2012 financing	0
Conversions:
August 24, 2006 financing	(740)
December 29, 2006 financing	(176)
March 27, 2007 financing	0
August 24, 2007 financing	0
October 28, 2008 financing	0
May 1, 2009 financing	(21)
July 15, 2009 financing	0
December 15, 2010 financing	0
January 10, 2011 financing	0
February 8, 2011 financing	0
March 11, 2011 financing	0
April 13, 2011 financing	(226)
May 31, 2011 financing	(885)
June 28, 2011 financing	(413)
July 13, 2011 financing	(1,656)
August 15, 2011 financing	(1,441)
September 15, 2011 financing	(1,458)
October 25, 2011 financing	0
December 8, 2011 financing	0
January 11, 2012 financing	0
March 26, 2012 financing	0
Ending balance, December 31, 2012	2,147
Embedded Derivative Financial Instruments [Member] | Series C Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives	(632)
Embedded Derivative Financial Instruments [Member] | Series D Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives	(1,294)
Warrant [Member]
Beginning balance, December 31, 2011:	14,942
Issuances:
January 11, 2012	13
February 6, 2012	9
March 26, 2012	42
April 26, 2012	11
July 20, 2012	8
June 1, 2012	9
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	(11,347)
Hybrid instruments	0
Change to fair value option related to compound embedded derivative	0
Change to fair value option related to debenture carrying value	0
Less: Day-one loss from debenture financings	0
Repayments
June 1, 2012 financing	0
July 20, 2012 financing	0
Conversions:
August 24, 2006 financing	0
December 29, 2006 financing	0
March 27, 2007 financing	0
August 24, 2007 financing	0
October 28, 2008 financing	0
May 1, 2009 financing	0
July 15, 2009 financing	0
December 15, 2010 financing	0
January 10, 2011 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
July 13, 2011 financing	0
August 15, 2011 financing	0
September 15, 2011 financing	0
October 25, 2011 financing	0
December 8, 2011 financing	0
January 11, 2012 financing	0
March 26, 2012 financing	0
Ending balance, December 31, 2012	3,687
Warrant [Member] | Series C Preferred Stock [Member]
Fair value adjustments:
Warrant derivatives	0
Warrant [Member] | Series D Preferred Stock [Member]
Fair value adjustments:
Warrant derivatives	0
Hybrid Instrument [Member]
Beginning balance, December 31, 2011:	16,458
Issuances:
January 11, 2012	0
February 6, 2012	0
March 26, 2012	0
April 26, 2012	878
July 20, 2012	732
June 1, 2012	799
Fair value adjustments:
Compound embedded derivatives	0
Warrant derivatives	0
Hybrid instruments	(11,926)
Change to fair value option related to compound embedded derivative	29,656
Change to fair value option related to debenture carrying value	26,809
Less: Day-one loss from debenture financings	(1,162)
Extinguished	9,692
Repayments
June 1, 2012 financing	(28)
July 20, 2012 financing	(666)
Conversions:
August 24, 2006 financing	(926)
December 29, 2006 financing	(677)
March 27, 2007 financing	(1,047)
August 24, 2007 financing	(831)
October 28, 2008 financing	(383)
May 1, 2009 financing	0
July 15, 2009 financing	(637)
December 15, 2010 financing	(215)
January 10, 2011 financing	(267)
February 8, 2011 financing	(180)
March 11, 2011 financing	(788)
April 13, 2011 financing	(210)
May 31, 2011 financing	0
June 28, 2011 financing	(53)
July 13, 2011 financing	0
August 15, 2011 financing	0
September 15, 2011 financing	0
October 25, 2011 financing	(141)
December 8, 2011 financing	(209)
January 11, 2012 financing	(386)
March 26, 2012 financing	0
Ending balance, December 31, 2012	64,292
Hybrid Instrument [Member] | Series C Preferred Stock [Member]
Fair value adjustments:
Hybrid instruments	0
Hybrid Instrument [Member] | Series D Preferred Stock [Member]
Fair value adjustments:
Hybrid instruments	$ 0