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Income Taxes - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2017 | Sep. 30, 2018 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Line Items] |  |  |  |  |  |
Federal corporate tax rate | 35.00% | 21.00% | 21.00% | 21.00% | 24.50% |
Non-cash adjustment to income tax expense |  |  |  |  | $ 805,000 |
Reversal of outstanding deferred tax asset valuation allowance due |  |  | $ 164,000 |  |  |
Deferred tax asset |  |  | 800,000 |  |  |
Domestic Country |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Net operating loss (NOL) carryforwards |  |  | $ 15,400,000 |  |  | $ 0
Minimum [Member] | State And Local Jurisdiction |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carry forwards expiration year |  |  | 2029 |  |  |
Maximum [Member] | State And Local Jurisdiction |  |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |  |
Operating loss carry forwards expiration year |  |  | 2032 |  |  |

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