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Income Taxes - Components of Net Deferred Tax Liability (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income Tax Disclosure [Abstract] |  |
Inventories | $ 400 | $ 356
Property and equipment | (3,058) | (2,912)
Accrued liabilities and other deductible differences | 19 | 25
Accrued employee benefits | 1,054 | 1,032
Goodwill | (1,693) | (1,693)
Other taxable differences | (9) | (6)
Total deferred tax liability | $ (3,287) | $ (3,198)

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