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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Sep. 30, 2017
--- | --- | ---
Deferred Tax Assets: |  |
Net operating loss | $ 13,444 | $ 11,823
Credit carryforwards | 3,987 | 3,258
Deferred compensation | 1,456 | 2,009
Uniform capitalization and inventory | 1,043 | 1,432
Stock-based compensation | 879 | 1,094
Reserve for accrued employee benefits | 791 | 1,208
Warranty accrual | 448 | 892
Accrued legal | 154 | 435
Postretirement benefits liability | 112 | 264
Allowance for doubtful accounts | 0 | 14
Goodwill | 54 | 64
Other | 112 | 44
Deferred tax assets | 22,480 | 22,537
Deferred Tax Liabilities: |  |
Depreciation and amortization | (6,946) | (10,002)
Deferred tax liabilities | (6,946) | (10,002)
Less: valuation allowance | (9,597) | (8,767)
Net deferred income tax asset | $ 5,937 | $ 3,768

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