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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
3 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Intangible Assets Net Excluding Goodwill [Abstract]    
Intangible assets subject to amortization, beginning balance $ 22,164,868  
Intangible assets subject to amortization, Amortization (425,107) $ (438,991)
Intangible assets subject to amortization, ending balance $ 21,739,761