Nature of Operations and Summary of Significant Accounting Policies - Components of Comprehensive Loss (Detail) (USD $)	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net loss	$ (5,291,869)	$ (7,275,706)	$ (7,839,996)
Other comprehensive loss:
Change in unrealized gains (losses) on marketable securities	(9,648)	2,454	9,239
Total comprehensive loss	$ (5,301,517)	$ (7,273,252)	$ (7,830,757)