Fair Value Measures (Details 2) (USD $)	0 Months Ended	1 Months Ended		3 Months Ended		1 Months Ended		3 Months Ended		1 Months Ended			0 Months Ended	1 Months Ended					0 Months Ended		1 Months Ended		3 Months Ended		0 Months Ended		1 Months Ended		6 Months Ended		0 Months Ended			1 Months Ended
	Jan. 16, 2013	Mar. 31, 2013	Feb. 22, 2013	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013 2011 Warrant Liabilities	Feb. 22, 2013 2011 Warrant Liabilities	Mar. 31, 2012 2011 Warrant Liabilities	Dec. 31, 2012 2011 Warrant Liabilities	Mar. 31, 2013 2012 Warrant Liabilities	Feb. 22, 2013 2012 Warrant Liabilities	Dec. 31, 2012 2012 Warrant Liabilities	Jan. 16, 2013 Third Tranche Warrant Liabilities	Feb. 22, 2013 Third Tranche Warrant Liabilities	Mar. 31, 2013 2013 Warrants	Feb. 22, 2013 2013 Warrants	Mar. 31, 2013 2013 SPA Option	Feb. 22, 2013 2013 SPA Option	Feb. 22, 2013 2011 Convertible Notes	Feb. 22, 2011 2011 Convertible Notes	Mar. 31, 2013 2011 Convertible Notes	Feb. 22, 2013 2011 Convertible Notes	Mar. 31, 2012 2011 Convertible Notes	Dec. 31, 2012 2011 Convertible Notes	Feb. 22, 2013 2012 Convertible Notes	Jul. 02, 2012 2012 Convertible Notes	Mar. 31, 2013 2012 Convertible Notes	Feb. 22, 2013 2012 Convertible Notes	Jul. 02, 2012 2012 Convertible Notes	Dec. 31, 2012 2012 Convertible Notes	Feb. 22, 2013 Third Tranche Convertible Notes	Jan. 16, 2013 Third Tranche Convertible Notes	Jan. 16, 2013 Third Tranche Convertible Notes	Mar. 31, 2013 Third Tranche Convertible Notes	Feb. 22, 2013 Third Tranche Convertible Notes
Changes in the Convertible Notes and Investor Warrants
Fair value of liabilities at the beginning of the period	$ 11,898,000	$ 17,490,000	$ 12,592,000	$ 11,898,000	$ 6,927,000	$ 3,916,000	$ 2,000,000	$ 1,600,000	$ 2,000,000	$ 1,632,000	$ 1,800,000	$ 1,800,000		$ 300,000	$ 2,759,000		$ 1,211,000				$ 6,070,000	$ 6,510,000	$ 5,327,000	$ 6,510,000			$ 1,516,000	$ 1,588,000		$ 1,588,000				$ 386,000	$ 394,000
Amortization of debt discount			95,000	95,000	66,000														38,000			38,000	66,000		55,000			55,000			2,000				2,000
Allocation of initial proceeds	250,000												108,000							3,208,000						417,000			417,000			142,000	142,000
Initial fair value adjustment/Fair value adjustment	444,000	5,317,000	(450,000)		5,507,000	2,014,000		2,400,000		326,000			192,000		884,000		583,000				1,130,000	(370,000)	3,107,000				284,000	(72,000)					252,000	96,000	(8,000)
Carrying value of old debt at modification			(8,137,000)																			(6,178,000)						(1,571,000)							(388,000)
Fair value of new debt at modification			7,972,000																			6,070,000						1,516,000							386,000
Modification of warrants			2,548,000				1,916,000				632,000
Cancellation/retirement of warrants			(1,100,000)								(800,000)			(300,000)
Exercise of warrants		(844,000)				(844,000)
Fair value of instruments at issuance			3,970,000													2,759,000		1,211,000
Fair value of liabilities at the end of the period	$ 12,592,000	$ 21,963,000	$ 17,490,000	$ 21,963,000	$ 12,500,000	$ 5,086,000	$ 3,916,000	$ 4,000,000	$ 2,000,000	$ 1,958,000	$ 1,632,000	$ 1,800,000	$ 300,000		$ 3,643,000	$ 2,759,000	$ 1,794,000	$ 1,211,000	$ 6,070,000		$ 7,200,000	$ 6,070,000	$ 8,500,000	$ 6,510,000	$ 1,516,000		$ 1,800,000	$ 1,516,000		$ 1,588,000	$ 386,000	$ 394,000	$ 394,000	$ 482,000	$ 386,000