Equity (Schedule of Common Stock Reserved for Future Issuances) (Details)	Mar. 31, 2015	Sep. 30, 2014
Equity [Abstract]
Exercise of outstanding stock options	1,229,923	1,431,190
Unvested restricted stock units	593,203
Purchases under the employee stock purchase plan	1,020,874
Issuance of stock-based awards under the Equity Plans	612,707
Exercise of outstanding warrants	400,001	400,001
Purchases under the officer and director share purchase plan	88,741
Total reserved	3,945,449