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Organization and Significant Accounting Policies - Additional Information (Detail) - USD ($)
 12 Months Ended
Mar. 03, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2012
Schedule Of Investments [Line Items]          
Cash to fund operations   $ 81,214,354 $ 132,510,610 $ 19,114,444 $ 3,377,288
Investments   17,539,902 44,741,378    
Net increase (decrease) in cash   (51,296,256) 113,396,166 15,737,156  
Cash outflow related to continuing operating activities   (65,707,615) (35,416,373) (19,032,826)  
Cash payment for acquisition   10,000,000      
Capital expenditures   1,970,612 1,717,362 296,880  
Proceeds from sale of marketable securities   26,090,950 11,591,120 1,419,079  
Proceeds from the exercise of warrants and stock options   $ 504,512 12,878,044 $ 2,057,178  
Cash and cash equivalents, maturity description   three months or less      
Restricted Cash   $ 0 $ 0    
Amount insured in FDIC per account   $ 250,000      
Minimum          
Schedule Of Investments [Line Items]          
Property, Plant and Equipment, Useful Life   3 years      
Maximum          
Schedule Of Investments [Line Items]          
Property, Plant and Equipment, Useful Life   7 years      
Commercial bonds          
Schedule Of Investments [Line Items]          
Maturity description   less than 12 months      
Investments   $ 17,539,902      
Novartis          
Schedule Of Investments [Line Items]          
Cash payment for acquisition $ 10,000,000 $ 10,000,000