Supplementary Balance Sheet Information (Details) (USD $)	Mar. 31, 2013	Sep. 30, 2012
Supplementary Balance Sheet Information
Restricted cash	$ 500,000
Payroll and employee-related expenses	4,975,599	4,412,741
Accrued income, property, sales and use tax payable	2,749,957	2,197,419
Other	1,794,075	1,173,270
Total accrued expenses	$ 9,519,631	$ 7,783,430