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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