Financing (Details 11) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Beginning balance, December 31, 2011:			$ 40,571
January 11, 2012			302
February 6, 2012			185
March 26, 2012			329
April 26, 2012			889
June 1, 2012			808
July 20, 2012			740
Fair value adjustments:
Compound embedded derivatives	1,036	43,727	(13,262)	12,457
Warrant derivatives	4,897	568	5,818	2,263
Hybrid instruments	6,353	17,631	11,958	4,203
Change to fair value option related to compound embedded derivative			0
Change to fair value option related to debenture carrying value			26,809
Day-one loss from derivative financings	(315)	0	(1,162)	0
Extinguished			27,479
Conversions:
August 24, 2006 financing			(1,016)
December 29, 2006 financing			(692)
March 27, 2007 financing			(1,047)
August 24, 2007 financing			(831)
October 28, 2008 financing			(162)
May 1, 2009 financing			(21)
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			(467)
July 13, 2011 financing			(1,656)
August 15, 2011 financing			(1,440)
September 15, 2011 financing			(1,458)
October 25, 2011 financing			(141)
January 11, 2012 financing			(195)
Ending balance, September 30, 2012	78,612		78,612
Series C Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives			(632)
Warrant derivatives	0	0	0	53
Series D Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives			(1,295)
Warrant derivatives	847	42	795	220
Embedded Derivative Financial Instruments [Member]
Beginning balance, December 31, 2011:			9,171
January 11, 2012			289
February 6, 2012			176
March 26, 2012			287
April 26, 2012			0
June 1, 2012			0
July 20, 2012			0
Fair value adjustments:
Compound embedded derivatives			13,262
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
Day-one loss from derivative financings			0
Extinguished			17,787
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)
December 15, 2010 financing			0
January 10, 2011 financing			0
February 8, 2011 financing			0
April 13, 2011 financing			(226)
May 31, 2011 financing			(885)
June 28, 2011 financing			(414)
July 13, 2011 financing			(1,656)
August 15, 2011 financing			(1,440)
September 15, 2011 financing			(1,458)
October 25, 2011 financing			0
January 11, 2012 financing			0
Ending balance, September 30, 2012	2,373		2,373
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			(1,295)
Warrant [Member]
Beginning balance, December 31, 2011:			14,942
January 11, 2012			13
February 6, 2012			9
March 26, 2012			42
April 26, 2012			11
June 1, 2012			9
July 20, 2012			8
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			(5,818)
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
Day-one loss from derivative financings			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
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
January 11, 2012 financing			0
Ending balance, September 30, 2012	9,216		9,216
Warrant [Member] | Series C Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			0
Warrant [Member] | Series D Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			0
Hybrid Instrument [Member]
Beginning balance, December 31, 2011:			16,458
January 11, 2012			0
February 6, 2012			0
March 26, 2012			0
April 26, 2012			878
June 1, 2012			799
July 20, 2012			732
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			0
Hybrid instruments			(11,958)
Change to fair value option related to compound embedded derivative			29,656
Change to fair value option related to debenture carrying value			26,809
Day-one loss from derivative financings			(1,162)
Extinguished			9,692
Conversions:
August 24, 2006 financing			(276)
December 29, 2006 financing			(516)
March 27, 2007 financing			(1,047)
August 24, 2007 financing			(831)
October 28, 2008 financing			(162)
May 1, 2009 financing			0
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)
January 11, 2012 financing			(195)
Ending balance, September 30, 2012	67,023		67,023
Hybrid Instrument [Member] | Series C Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives			0
Hybrid instruments			0
Hybrid Instrument [Member] | Series D Preferred Stock [Member]
Fair value adjustments:
Compound embedded derivatives			0
Hybrid instruments			$ 0