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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Intangible Assets Net Excluding Goodwill [Abstract]    
Intangible assets subject to amortization, beginning balance $ 20,464,439  
Intangible assets subject to amortization, Amortization (425,107) $ (425,107)
Intangible assets subject to amortization, ending balance $ 20,039,332