Fair Value Measurements (Details 2) (USD $)	0 Months Ended		1 Months Ended	7 Months Ended	9 Months Ended		0 Months Ended	1 Months Ended	7 Months Ended	0 Months Ended	7 Months Ended	0 Months Ended	1 Months Ended	7 Months Ended	9 Months Ended		0 Months Ended	1 Months Ended	7 Months Ended	9 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended	1 Months Ended	7 Months Ended	0 Months Ended	7 Months Ended	0 Months Ended			1 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended		0 Months Ended		1 Months Ended	3 Months Ended	7 Months Ended	9 Months Ended		0 Months Ended			1 Months Ended	7 Months Ended
	Sep. 30, 2013	Jan. 16, 2013	Feb. 22, 2013	Sep. 18, 2013	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 February 2013 SPA Option	Feb. 22, 2013 February 2013 SPA Option	Sep. 18, 2013 February 2013 SPA Option	Sep. 30, 2013 September 2013 SPA Option	Sep. 18, 2013 September 2013 SPA Option	Sep. 30, 2013 2011 Warrant Liabilities	Feb. 22, 2013 2011 Warrant Liabilities	Sep. 18, 2013 2011 Warrant Liabilities	Sep. 30, 2012 2011 Warrant Liabilities	Dec. 31, 2012 2011 Warrant Liabilities	Sep. 30, 2013 2012 Warrant Liabilities	Feb. 22, 2013 2012 Warrant Liabilities	Sep. 18, 2013 2012 Warrant Liabilities	Sep. 30, 2012 2012 Warrant Liabilities	Dec. 31, 2012 2012 Warrant Liabilities	Jan. 16, 2013 Third Tranche Warrant Liabilities	Feb. 22, 2013 Third Tranche Warrant Liabilities	Sep. 30, 2013 February 2013 Warrants	Feb. 22, 2013 February 2013 Warrants	Sep. 18, 2013 February 2013 Warrants	Sep. 30, 2013 September 2013 Warrants	Sep. 18, 2013 September 2013 Warrants	Sep. 30, 2013 2011 Convertible Notes	Feb. 22, 2013 2011 Convertible Notes	Feb. 22, 2011 2011 Convertible Notes	Feb. 22, 2013 2011 Convertible Notes	Sep. 30, 2012 2011 Convertible Notes	Sep. 18, 2013 2011 Convertible Notes	Sep. 30, 2012 2011 Convertible Notes	Dec. 31, 2012 2011 Convertible Notes	Sep. 30, 2013 2012 Convertible Notes	Jul. 02, 2012 2012 Convertible Notes	Feb. 22, 2013 2012 Convertible Notes	Sep. 30, 2012 2012 Convertible Notes	Sep. 18, 2013 2012 Convertible Notes	Sep. 30, 2012 2012 Convertible Notes	Dec. 31, 2012 2012 Convertible Notes	Sep. 30, 2013 Third Tranche Convertible Notes	Jan. 16, 2013 Third Tranche Convertible Notes	Jan. 16, 2013 Third Tranche Convertible Notes	Feb. 22, 2013 Third Tranche Convertible Notes	Sep. 18, 2013 Third Tranche Convertible Notes
Changes in the Convertible Notes and Investor Warrants
Fair value of liabilities at the beginning of the period	$ 13,537,000	$ 11,898,000	$ 12,592,000	$ 17,490,000	$ 11,898,000	$ 6,927,000	$ 404,000		$ 1,211,000	$ 1,166,000		$ 1,048,000	$ 2,000,000	$ 3,916,000	$ 1,600,000	$ 2,000,000	$ 424,000	$ 1,800,000	$ 1,632,000		$ 1,800,000		$ 300,000	$ 2,017,000		$ 2,759,000	$ 1,807,000		$ 4,920,000			$ 6,510,000		$ 6,070,000	$ 5,327,000	$ 6,510,000	$ 1,390,000		$ 1,588,000		$ 1,516,000		$ 1,588,000	$ 361,000			$ 394,000	$ 386,000
Amortization of debt discount			95,000		158,000	215,000																								38,000		38,000	67,000		198,000				55,000	17,000		17,000					2,000
Allocation of initial proceeds		250,000				1,000,000														583,000		108,000									3,208,000							417,000				417,000			142,000	142,000
Modification of warrants			2,548,000										1,916,000					632,000
Conversion of debentures and warrants	(569,000)			(2,969,000)								(265,000)		(2,152,000)					(238,000)										(304,000)					(579,000)
Initial fair value adjustment/Fair value adjustment	(723,000)	444,000	(450,000)	(5,948,000)		7,734,000	(404,000)		(807,000)	(291,000)		(245,000)		(716,000)	1,600,000		(141,000)		(970,000)	1,917,000		192,000		1,165,000		(742,000)	(233,000)		(426,000)			(370,000)		(2,041,000)	2,715,000		(100,000)		(72,000)		(536,000)	1,502,000		(48,000)		252,000	(8,000)	(136,000)
Carrying value of old debt at modification			(8,137,000)	(4,680,000)																												(6,178,000)		(3,450,000)					(1,571,000)		(980,000)						(388,000)	(250,000)
Fair value of new debt at modification			7,972,000	6,671,000																												6,070,000		4,920,000					1,516,000		1,390,000						386,000	361,000
Cancellation/retirement of warrants			(1,100,000)															(800,000)					(300,000)
Fair value of instruments at issuance			3,970,000	2,973,000				1,211,000			1,166,000														2,759,000			1,807,000
Fair value of liabilities at the end of the period	$ 12,245,000	$ 12,592,000	$ 17,490,000	$ 13,537,000	$ 12,245,000	$ 15,876,000		$ 1,211,000	$ 404,000	$ 875,000	$ 1,166,000	$ 538,000	$ 3,916,000	$ 1,048,000	$ 3,200,000	$ 2,000,000	$ 283,000	$ 1,632,000	$ 424,000	$ 2,500,000	$ 1,800,000	$ 300,000		$ 3,182,000	$ 2,759,000	$ 2,017,000	$ 1,574,000	$ 1,807,000	$ 4,190,000	$ 6,070,000		$ 6,070,000	$ 8,240,000	$ 4,920,000	$ 8,240,000	$ 6,510,000	$ 1,290,000		$ 1,516,000	$ 1,936,000	$ 1,390,000	$ 1,936,000	$ 1,588,000	$ 313,000	$ 394,000	$ 394,000	$ 386,000	$ 361,000