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Income Taxes - Components of Deferred Tax Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Sep. 30, 2014
Current deferred tax assets:    
Inventories $ 1,361 $ 1,712
Accrued expenses 911 1,110
Tax loss carryforwards 7,560  
Current deferred tax assets 9,832 2,822
Valuation allowance (578) (2,822)
Net current deferred tax assets 9,254  
Long-term deferred tax assets:    
Depreciation and amortization 5,152 6,008
Stock based compensation 3,776 3,902
Tax loss carryforwards 9,890 24,418
Other 585 374
Long-term deferred tax assets 19,403 34,702
Valuation allowance (1,140) $ (34,702)
Net long-term deferred tax assets $ 18,263