Income Taxes - Schedule of Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Deferred tax assets:
Net operating loss carryforwards	$ 17,112	$ 17,180
Accruals and reserves	2,865	1,441
Foreign tax credits	1,618	811
Operating lease liabilities	2,719	2,492
Research and development costs	1,011
Foreign service fee	1,579	1,579
Other assets	731	467
Total deferred tax assets	27,635	23,970
Valuation allowance	(21,506)	(20,000)	$ (23,292)
Deferred tax assets, net of valuation allowance	6,129	3,970
Deferred tax liabilities:
Goodwill and identifiable intangible assets	(1,616)	(321)
Property and equipment, net	(1,356)	(758)
Operating lease, right-of-use assets	(2,720)	(2,494)
Prepaid assets	(336)	(318)
Total deferred tax liabilities	(6,028)	(3,891)
Total deferred tax assets, net	$ 101	$ 79