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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)

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