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Nature of Operations and Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) (USD $)
3 Months Ended 6 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2014
Mar. 31, 2013
Comprehensive Income Net Of Tax [Abstract]        
Net loss $ (2,193,017) $ (2,393,275) $ (3,661,317) $ (3,752,917)
Other comprehensive loss:        
Change in unrealized gains (losses) on marketable securities 6,686 (1,842) 5,845 2,536
Total comprehensive loss $ (2,186,331) $ (2,395,117) $ (3,655,472) $ (3,750,381)