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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)