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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Intangible Assets Net Excluding Goodwill [Abstract]        
Intangible assets subject to amortization, beginning balance     $ 18,764,010  
Intangible assets subject to amortization, Amortization $ (425,107) $ (425,107) (1,275,322) $ (1,275,322)
Intangible assets subject to amortization, ending balance $ 17,488,688   $ 17,488,688