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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Mar. 31, 2019 | Mar. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |
Provision for income taxes | $ 0 | $ 0 | $ 0 | $ 0
Net income | $ 23,896,982 | $ (14,884,311) | $ 35,934,235 | $ (28,083,189)

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