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)