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Income Taxes - Components of Deferred Federal Income Taxes (Detail) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Accrued liabilities | $ 136 | $ 15
Deferred compensation | 520 | 1,113
Allowance for doubtful accounts | 71 | 101
Inventory | 73 | 83
Net operating loss | 2,783 | 6,528
Property and equipment | 71 | 143
Foreign tax credit carry forward |  | 3,297
Deferred tax assets | 3,654 | 11,280
Deferred tax liabilities: |  |
Valuation allowance | (3,654) | (11,280)
Equity in foreign investments |  | (2,824)
Deferred tax liabilities | $ (3,654) | (14,104)
Net deferred tax assets (liabilities) |  | $ (2,824)

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