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Income Taxes - Components of Net Deferred Tax Asset or Liability (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Deferred Tax Assets    
Accrued reserves and allowances $ 3,916 $ 1,866
Allowance for doubtful accounts 426 448
Inventories 213 284
Intangibles 3,279 806
Net operating loss carryforwards 2,623 2,921
Other current and long-term 10 2
Long-term deferred tax assets 10,467 6,327
Less: Valuation allowance (1,746) (2,415)
Net deferred tax assets 8,721 3,912
Deferred Tax Liabilities    
Accrued reserves and allowances (308) (565)
Property and equipment (1,453) (1,505)
Intangibles (3,543) (4,899)
Investment in partnership (9,189) (9,530)
Other (208) (62)
Long-term deferred tax liabilities (14,701) (16,561)
Net deferred tax liabilities $ (5,980) $ (12,649)