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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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Income taxes.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible state and local operating loss carryforwards.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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A credit or adjustment for government or taxing authority authorized decrease in taxes owed as a result of meeting certain tax policy conditions.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

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