Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)	12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Intangible Assets Net Excluding Goodwill [Abstract]
Intangible assets not subject to amortization, beginning balance	$ 944,935	$ 3,117,322
Intangible assets not subject to amortization, Impairment		(2,172,387)
Intangible assets not subject to amortization, ending balance	944,935	944,935	$ 3,117,322
Intangible assets subject to amortization, beginning balance	68,538	123,191
Intangible assets subject to amortization, Acquisition of Novartis RNAi Assets	24,857,214
Intangible assets subject to amortization, Amortization	(1,046,571)	(54,653)	(236,009)
Intangible assets subject to amortization, ending balance	23,879,181	68,538	123,191
Total Intangible assets, beginning balance	1,013,473	3,240,513
Total Intangible assets, Impairment		(2,172,387)	(1,308,047)
Total Intangible assets, ending balance	$ 24,824,116	$ 1,013,473	$ 3,240,513