Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)	Jun. 30, 2015	Sep. 30, 2014
Property Plant And Equipment [Abstract]
Computers, office equipment and furniture	$ 372,401	$ 334,162
Research equipment	5,552,187	4,614,176
Software	110,428	69,623
Leasehold improvements	3,117,537	3,045,022
Total gross fixed assets	9,152,553	8,062,983
Less: Accumulated depreciation and amortization	(5,043,886)	(4,190,230)
Property and equipment, net	$ 4,108,667	$ 3,872,753