Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income (Loss) Per Share (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Earnings Per Share Basic And Diluted [Abstract]
Net income (loss)	$ 916,961	$ (1,632,601)	$ 1,570,791	$ (5,293,919)
Weighted-average common shares outstanding - basic	30,764,694	30,481,168	30,704,250	30,451,058
Weighted-average common shares outstanding - diluted	31,645,696	30,481,168	31,389,569	30,451,058
Net income (loss) per share - Basic	$ 0.03	$ (0.05)	$ 0.05	$ (0.17)
Net income (loss) per share - Diluted	$ 0.03	$ (0.05)	$ 0.05	$ (0.17)