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Income Taxes - Components of Deferred Tax Asset (Detail) - USD ($) $ in Thousands | Sep. 30, 2017 | Sep. 30, 2016
--- | --- | ---
Deferred tax assets: |  |
Inventories | $ 1,028 | $ 1,095
Accrued expenses | 521 | 919
Depreciation and amortization |  | 1,497
Stock based compensation | 4,121 | 3,566
Tax loss carryforwards | 3,901 | 13,879
Other | 593 | 573
Valuation allowance | (246) | (454)
Total Long-term deferred tax assets | 9,918 | 21,075
Deferred tax liabilities: |  |
Depreciation and amortization | (1,149) |
Total long-term deferred tax liabilities | (1,149) |
Net deferred tax assets | $ 8,769 | $ 21,075

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