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Income Taxes - Schedule of Components of Deferred Tax Assets and Deferred Tax Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019
--- | --- | --- | ---
Deferred tax assets (liabilities): |  |  |
Capitalized inventory costs | $ 103 | $ 204 |
Inventory write-downs | 815 | 991 |
Accrued warranty | 78 | 53 |
Deferred profits |  | 1 |
Accruals and reserves not currently deductible | 1,827 | 2,913 |
Stock option expense | 832 | 806 |
Federal net operating loss carryforwards | 20,365 | 18,445 |
Foreign and state net operating losses | 285 | 231 |
Book vs. tax depreciation and amortization | (1,724) | (1,465) |
Foreign tax credits | 1,207 |  |
Other deferred tax assets | 135 | 120 |
Total deferred tax assets | 23,923 | 22,299 |
Valuation allowance | (23,292) | (21,733) | $ (23,900)
Deferred tax assets, net of valuation allowance | $ 631 | $ 566 |

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