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Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
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) (850,215) $ (850,215)
Intangible assets subject to amortization, ending balance $ 19,614,224   $ 19,614,224