Property and Equipment - Summary of Property and Equipment (Detail) - USD ($)	Sep. 30, 2016	Sep. 30, 2015
Property Plant And Equipment [Abstract]
Computers, office equipment and furniture	$ 442,915	$ 404,964
Research equipment	7,490,400	6,354,584
Software	80,841	110,428
Leasehold improvements	11,885,365	3,117,537
Total gross fixed assets	19,899,521	9,987,513
Less: Accumulated depreciation and amortization	(4,512,760)	(5,460,665)
Property and equipment, net	$ 15,386,761	$ 4,526,848