Acquisitions - Summary of Estimated Fair Values at Date of Acquisition (Detail) - USD ($)		9 Months Ended
	Mar. 03, 2015	Jun. 30, 2015	Sep. 30, 2014	Sep. 30, 2013
Asset Acquisition [Line Items]
Assets acquired		$ 24,317,951	$ 68,538	$ 123,191
Acquired in-process research and development - Pre-Clinical Candidates		10,142,786
Assets acquired		$ 24,857,214
Novartis
Asset Acquisition [Line Items]
Acquired in-process research and development - Pre-Clinical Candidates	$ 10,142,786
Assets acquired	35,000,000
Novartis | Patents [Member]
Asset Acquisition [Line Items]
Assets acquired	21,728,334
Novartis | License [Member]
Asset Acquisition [Line Items]
Assets acquired	$ 3,128,880