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Income Taxes - Components of Deferred Tax Asset (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Deferred tax assets:    
Inventories $ 588 $ 1,028
Accrued expenses 644 521
Stock based compensation 2,258 4,121
Tax loss carryforwards 3,910 3,901
Other 580 593
Valuation allowance (119) (246)
Total long-term deferred tax assets 7,861 9,918
Deferred tax liabilities:    
Depreciation and amortization (4,453) (1,149)
Total long-term deferred tax liabilities (4,453) (1,149)
Net deferred tax assets $ 3,408 $ 8,769