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Income Taxes - Components of Net Deferred Tax Asset or Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Deferred Tax Assets    
Accrued reserves and allowances $ 4,245 $ 3,916
Allowance for doubtful accounts 500 426
Inventories 335 213
Intangibles 4,937 3,279
Net operating loss carryforwards 1,446 2,623
Other 4 10
Long-term deferred tax assets 11,467 10,467
Less: Valuation allowance (1,255) (1,746)
Net deferred tax assets 10,212 8,721
Deferred Tax Liabilities    
Accrued reserves and allowances (365) (308)
Property and equipment (2,091) (1,453)
Intangibles (3,850) (3,543)
Investment in partnership (10,266) (9,189)
Other (242) (208)
Long-term deferred tax liabilities (16,814) (14,701)
Net deferred tax liabilities $ (6,602) $ (5,980)