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Income Taxes - Summary of Effective Income Tax Rate Reconciliation (Detail)	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2019	Sep. 30, 2018
Income Tax Disclosure [Abstract]
At U.S. federal statutory rate	35.00%	21.00%	21.00%
State taxes, net of federal effect		7.30%	7.90%
Stock compensation		(15.00%)	2.60%
Mark-to-market adjustments		0.00%	0.20%
Valuation allowance		(13.00%)	36.20%
Federal tax rate change in 2018			(67.90%)
Effective income tax rate		0.30%	0.00%

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to stock compensation.

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to mark-to-market adjustments.

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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

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