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Income Taxes - Components of Deferred Federal Income Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax assets: |  |
Accrued liabilities | $ 11 | $ 136
Deferred compensation | 642 | 520
Allowance for doubtful accounts |  | 71
Inventory |  | 73
Net operating loss | 3,430 | 2,783
Property and equipment |  | 71
Deferred tax assets | 4,083 | 3,654
Valuation allowance | $ (4,083) | $ (3,654)

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