Income Taxes - Schedule of Income Taxes from Continuing Operations Before Income Tax Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Current income tax provision (benefit):
U.S. federal	$ 0	$ 0
U.S. state and local	19	(27)
Non-U.S.	192	(109)
Total current tax provision (benefit)	211	(136)
Deferred income tax provision (benefit):
U.S. federal	10	8
U.S. state and local	1	2
Non-U.S.	(433)	(575)
Total deferred tax provision (benefit)	(422)	(565)
Income tax benefit	$ (211)	$ (701)