Share-Based Compensation - 2019 Stock-Based Incentive Compensation Plan (Details) - USD ($)		12 Months Ended
	Aug. 27, 2020	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Share-based compensation.
Common stock, shares authorized		75,000,000	75,000,000
Share-based compensation expense		$ 341,000	$ 177,000	$ 173,000
Options
Outstanding at the beginning of the period (in shares)		104,500	550,834
Outstanding at the end of the period (in shares)		100,000	104,500	550,834
2019 Plan
Share-based compensation.
Common stock, shares authorized		139,691
Number of shares of common stock reserved for awards		750,000
Number of shares of common stock available for awards under the plan		689,147
2019 Plan | Employee
Share-based compensation.
Number of shares of common stock reserved for awards		300,000
2019 Plan | Employee and Non Employee Stock Option
Share-based compensation.
Share-based compensation expense		$ 181,000	$ 17,000	$ 0
Options
Outstanding at the beginning of the period (in shares)		100,000
Granted (in shares)		100,000		100,000
Outstanding at the end of the period (in shares)		100,000	100,000
Vested and expected to vest (in shares)		100,000
Options exercisable at the end of the period (in shares)		50,000
Weighted Average Exercise Price
Outstanding at the beginning of the period (in dollars per share)		$ 7.10
Granted (in dollars per share)				$ 7.10
Outstanding at the end of the period (in dollars per share)		7.10	$ 7.10
Vested and expected to vest (in dollars per share)		7.10
Options exercisable at the end of the period (in dollars per share)		$ 7.10
2019 Plan | Employee and Non Employee Stock Option | Chief Financial Officer
Options
Granted (in shares)	100,000