Warrant Liability (Details) (USD $)	1 Months Ended				3 Months Ended			9 Months Ended		32 Months Ended
	Oct. 31, 2012	May 31, 2012	Dec. 31, 2011	Jul. 31, 2008	Sep. 30, 2012	Mar. 31, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Nov. 07, 2012
Warrant Liability [Abstract]
Units issued in direct offering	12,385,321	10,000,000	700,000	6,686,650				8,400,000		24,957,715
Common shares per unit				1.0
Proceeds from direct offering		$ 12,100,000		$ 17,500,000		$ 800,000		$ 14,000,000		$ 49,900,000
Shares entitled per warrant				0.5
Price per unit				$ 2.68
Aggregate shares common stock callable by warrants				3,343,325
Exercise price of warrants				3.62
Change in fair value of warrant liability					(401,000)		736,000	(401,000)	1,973,000
Warrant liability					$ 769,000			$ 769,000