Description of Business (Liquidity and Capital Resources) (Details) (USD $)	3 Months Ended								12 Months Ended
	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2010	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2009
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Cash and cash equivalents	$ 9,047,000				$ 15,598,000				$ 9,047,000	$ 15,598,000	$ 19,944,000	$ 14,028,000
Working capital	4,000,000								4,000,000
Net loss	6,568,000	9,039,000	9,335,000	14,229,000	14,290,000	11,079,000	5,205,000	3,645,000	39,171,000	34,219,000	23,694,000
Net cash used in operating activities									$ 15,002,000	$ 6,289,000	$ (3,411,000)