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Income Taxes - Components of Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Sep. 30, 2018
--- | --- | ---
Deferred tax assets: |  |
Inventories | $ 774 | $ 588
Accrued expenses | 492 | 644
Stock based compensation | 2,388 | 2,258
Tax loss carryforwards | 2,316 | 3,910
Other | 562 | 580
Valuation allowance | (164) | (119)
Total long-term deferred tax assets | 6,368 | 7,861
Deferred tax liabilities: |  |
Depreciation and amortization | (7,510) | (4,453)
Total long-term deferred tax liabilities | (7,510) | (4,453)
Net deferred tax assets |  | $ 3,408
Net deferred tax liabilities | $ (1,142) |

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