Notes Payable - Schedule of Future Payments of Debt (Detail) (USD $)	Sep. 30, 2013	Sep. 30, 2012
Debt Disclosure [Abstract]
2014	$ 10,749,024
2015	13,437,031
2016	12,177,774
Total minimum payments	36,363,829
Less amount representing interest	6,363,829
Notes payable, gross	30,000,000
Unamortized discount on notes payable	(634,892)
Notes payable balance	29,365,108
Current portion of notes payable, net of debt discount	7,942,945	2,162,263
Notes payable, net of current portion and debt discount	$ 21,422,163	$ 26,698,263