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Income Taxes - Summary of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred tax assets: |  |
Net U.S. operating loss carryforwards | $ 5,002 | $ 3,200
Net non-U.S. operating loss carryforwards | 866 | 592
Employee benefits | 2,456 | 1,656
Inventory reserves | 970 | 1,029
Allowance for doubtful accounts | 144 | 126
Intangibles | 2,535 | 2,826
Foreign tax credits | 1,724 | 1,956
Other tax credits | 1,232 | 1,164
Other | 918 | 1,015
Total deferred tax assets | 15,847 | 13,564
Deferred tax liabilities: |  |
Depreciation | (8,135) | (5,449)
Prepaid expenses | (192) | (296)
Other | (1,681) | (1,832)
Total deferred tax liabilities | (10,008) | (7,577)
Net deferred tax assets | 5,839 | 5,987
Valuation allowance | (7,557) | (8,400)
Net deferred tax liabilities | $ (1,718) | $ (2,413)

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