Financing (Details 11) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 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
Fair value adjustments:
Compound embedded derivatives	75,351	(37,941)	(14,298)	(31,270)
Warrant derivatives	42,409	(87)	921	1,695
Hybrid instruments	36,773	(15,899)	5,603	(13,428)
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 Debenture Financings	(847)		(847)
Extinguished			27,479
Conversions:
August 24, 2006 financing			(740)
December 29, 2006 financing			(176)
March 27, 2007 financing			(740)
August 24, 2007 financing			(585)
May 1, 2009 financing			(21)
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)
Ending balance, June 30, 2012	94,031		94,031
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			(370)
Warrant derivatives	6,819	(11)	(52)	178
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
Fair value adjustments:
Compound embedded derivatives			14,298
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 Debenture 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
May 1, 2009 financing			(21)
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)
Ending balance, June 30, 2012	3,409		3,409
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
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			(921)
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 Debenture Financings			0
Conversions:
August 24, 2006 financing			0
December 29, 2006 financing			0
March 27, 2007 financing			0
August 24, 2007 financing			0
May 1, 2009 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
Ending balance, June 30, 2012	14,105		14,105
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
Fair value adjustments:
Compound embedded derivatives			0
Warrant derivatives			0
Hybrid instruments			(5,603)
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 Debenture Financings			(847)
Extinguished			9,692
Conversions:
August 24, 2006 financing			0
December 29, 2006 financing			0
March 27, 2007 financing			(740)
August 24, 2007 financing			(585)
May 1, 2009 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
Ending balance, June 30, 2012	76,517		76,517
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