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Acquisitions - Summary of Estimated Relative Fair Values at Date of Acquisition (Detail) - USD ($)
 12 Months Ended
Mar. 03, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Asset Acquisition [Line Items]        
Assets acquired   $ 23,879,181 $ 68,538 $ 123,191
Acquired in-process research and development - Pre-Clinical Candidates   $ 10,142,786    
Novartis        
Asset Acquisition [Line Items]        
Acquired in-process research and development - Pre-Clinical Candidates $ 10,142,786      
Total purchase consideration 35,000,000      
Novartis | Patents        
Asset Acquisition [Line Items]        
Assets acquired 21,728,334      
Novartis | License        
Asset Acquisition [Line Items]        
Assets acquired $ 3,128,880