Property, Equipment and Improvements, Net - Tabular (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	$ 9,044	$ 9,182
Less accumulated depreciation and amortization	(8,519)	(8,535)
Property, equipment and improvements, net	525	647
Leasehold improvements
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	224	224
Equipment
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	8,626	8,842
Automobiles
Property, Plant and Equipment [Line Items]
Property, equipment and improvements, gross	$ 194	$ 116