Convertible Notes and Warrants (Details 2) (USD $)	0 Months Ended	1 Months Ended	3 Months Ended				3 Months Ended						3 Months Ended								0 Months Ended	3 Months Ended	0 Months Ended		1 Months Ended	3 Months Ended					0 Months Ended		1 Months Ended	3 Months Ended	6 Months Ended			0 Months Ended			1 Months Ended	3 Months Ended
	Jan. 16, 2013	Feb. 22, 2013	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012	Dec. 31, 2011	Mar. 31, 2013 2011 Warrant Liabilities	Mar. 31, 2012 2011 Warrant Liabilities	Feb. 22, 2013 2011 Warrant Liabilities	Jan. 16, 2013 2011 Warrant Liabilities	Dec. 31, 2012 2011 Warrant Liabilities	Dec. 31, 2011 2011 Warrant Liabilities	Mar. 31, 2013 2012 Warrant Liabilities	Feb. 22, 2013 2012 Warrant Liabilities	Jan. 16, 2013 2012 Warrant Liabilities	Dec. 31, 2012 2012 Warrant Liabilities	Mar. 31, 2013 2013 Warrants Liabilities	Feb. 22, 2013 2013 Warrants Liabilities	Mar. 31, 2013 2013 SPA Option	Feb. 22, 2013 2013 SPA Option	Jan. 16, 2013 Third Tranche Warrant Liabilities	Mar. 31, 2013 Third Tranche Warrant Liabilities	Feb. 22, 2013 2011 Convertible Notes	Feb. 22, 2011 2011 Convertible Notes	Feb. 22, 2013 2011 Convertible Notes	Mar. 31, 2013 2011 Convertible Notes	Mar. 31, 2012 2011 Convertible Notes	Jan. 16, 2013 2011 Convertible Notes	Dec. 31, 2012 2011 Convertible Notes	Dec. 31, 2011 2011 Convertible Notes	Feb. 22, 2013 2012 Convertible Notes	Jul. 02, 2012 2012 Convertible Notes	Feb. 22, 2013 2012 Convertible Notes	Mar. 31, 2013 2012 Convertible Notes	Jul. 02, 2012 2012 Convertible Notes	Jan. 16, 2013 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	Feb. 22, 2013 Third Tranche Convertible Notes	Mar. 31, 2013 Third Tranche Convertible Notes
Convertible Notes
Net charge to other income (expense)			$ (1,312,000)	$ (3,107,000)																		$ 108,000					$ (3,107,000)							$ (157,000)								$ (86,000)
Net charge to other income (expense)			(3,999,000)	(2,400,000)			(3,930,000)	(2,400,000)					(958,000)
Other charge to income (expense) for loss on extinguishment and adjustments to fair value																										(652,000)	0
Debt discount to be amortized																								792,000								583,000			583,000				108,000	108,000
Write off of debt discount																							265,000								462,000							106,000
Shares of common stock issued on conversion of warrants							3,217,741
Cashless exercise of warrants			844,000				844,000
Changes in the Convertible Notes and Investor Warrants
Allocation of initial proceeds	250,000																				108,000			3,208,000								417,000			417,000				142,000	142,000
Amortization of debt discount		95,000	95,000	66,000																			38,000		38,000		66,000				55,000		55,000					2,000			2,000
Total Liabilities	12,592,000	17,490,000	21,963,000	12,500,000	11,898,000	6,927,000	5,086,000	4,000,000	3,916,000	2,000,000	2,000,000	1,600,000	1,958,000	1,632,000	1,800,000	1,800,000	3,643,000	2,759,000	1,794,000	1,211,000	300,000		6,070,000		6,070,000	7,200,000	8,500,000	6,510,000	6,510,000	5,327,000	1,516,000		1,516,000	1,800,000		1,588,000	1,588,000	386,000	394,000	394,000	386,000	482,000
Fair value of amended convertible note		$ 7,972,000																							$ 6,070,000								$ 1,516,000								$ 386,000
Warrants exercised							8,749,999