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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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