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Income Taxes - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Income Tax Disclosure [Abstract]        
Provision for income taxes $ 0 $ 0 $ 0 $ 0
Net income $ 20,335,708 $ (15,606,017) $ 56,269,944 $ (43,689,207)