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Property and Equipment - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Property Plant And Equipment [Abstract]        
Depreciation and amortization expense for property and equipment $ 578,342 $ 751,134 $ 2,081,447 $ 2,195,558