Equity - Schedule of Common Stock Reserved for Future Issuances (Details)	Jun. 30, 2012	Sep. 30, 2011
Exercise of outstanding stock options	2,109,032
Purchases under the employee stock purchase plan	900,956
Vesting of restricted stock awards and units	1,033,685
Outstanding warrants	750,010	750,010
Purchases under the officer and director share purchase plan	96,446
Total common stock reserved for future issuances	4,890,129