Income Taxes - Schedule of Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2019
Current:
Domestic federal		$ (239)
Foreign	$ 1,999	1,407	$ 1,278
Foreign withholding taxes	292	201	94
Domestic state	(300)	(59)	58
Total current	1,991	1,310	1,430
Deferred:
Foreign	(65)	(566)
Total deferred	(65)	(566)
Total provision	$ 1,926	$ 744	$ 1,430