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Nature of Operations and Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) (USD $)
3 Months Ended 9 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Comprehensive Income Net Of Tax [Abstract]        
Net loss $ (1,632,601) $ (2,052,059) $ (5,293,919) $ (5,804,976)
Other comprehensive loss:        
Change in unrealized (losses) gain on marketable securities (4,948) (5,481) 897 (2,945)
Total comprehensive loss $ (1,637,549) $ (2,057,540) $ (5,293,022) $ (5,807,921)