Equity (Schedule of Common Stock Reserved for Future Issuances) (Details)	Dec. 31, 2013	Sep. 30, 2013
Equity [Abstract]
Exercise of outstanding stock options	1,706,678	1,745,948
Unvested restricted stock units	739,209
Purchases under the employee stock purchase plan	433,958
Issuance of stock-based awards under the Equity Plans	576,834
Exercise of outstanding warrants	400,001	400,001
Purchases under the officer and director share purchase plan	88,741
Total reserved	3,945,421