Intangible Assets - Schedule of Intangible Assets (Detail) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2015	Mar. 31, 2014	Sep. 30, 2014
Intangible Assets Net Excluding Goodwill [Abstract]
Intangible assets not subject to amortization, beginning balance			$ 944,935	$ 3,117,322	$ 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		944,935
Intangible assets subject to amortization, beginning balance			68,538	123,191	123,191
Intangible assets subject to amortization, Acquisition of Novartis RNAi Assets			24,857,214
Intangible assets subject to amortization, Amortization	(155,366)	(13,663)	(169,030)	(27,327)	(54,653)
Intangible assets subject to amortization, ending balance	24,756,722		24,756,722		68,538
Total Intangible assets, beginning balance			1,013,473	3,240,513	3,240,513
Total Intangible assets, Impairment					(2,172,387)
Total Intangible assets, ending balance	$ 25,701,657		$ 25,701,657		$ 1,013,473