Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Sep. 30, 2022
Deferred tax assets:
Net U.S. operating loss carryforwards	$ 8,107	$ 6,166
Net non-U.S. operating loss carryforwards	740	1,023
Employee benefits	1,088	1,514
Inventory reserves	569	1,045
Allowance for doubtful accounts	62	33
Intangibles	759	1,223
Foreign tax credits	1,724	1,724
Other tax credits	1,882	1,684
Other	2,130	1,171
Total deferred tax assets	17,061	15,583
Deferred tax liabilities:
Depreciation	(6,548)	(7,298)
Prepaid expenses	(355)	(286)
Other	(408)	(419)
Total deferred tax liabilities	(7,311)	(8,003)
Net deferred tax assets	9,750	7,580
Valuation allowance	(9,892)	(7,717)
Net deferred tax liabilities	$ (142)	$ (137)