Income Taxes - Schedule of Income Taxes from Continuing Operations Before Income Tax Provision (Benefit) (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Current income tax provision (benefit):
U.S. federal	$ 0	$ 0
U.S. state and local	2	14
Non-U.S.	152	(9)
Total current tax provision	154	5
Deferred income tax provision (benefit):
U.S. federal	10	10
U.S. state and local	3	3
Non-U.S.	(8)	(61)
Total deferred tax provision (benefit)	5	(48)
Income tax provision (benefit)	$ 159	$ (43)