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INCOME TAXES - Deferred income tax assets and liabilities (Details 3) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts | $ 181 | $ 58
Accruals and reserves | 1,673 | 2,552
Other | 644 | 259
Total deferred tax assets | 2,498 | 2,869
Deferred tax liabilities: |  |
Property, plant, and equipment | 3,579 | 3,610
Investments in foreign subsidiaries | 0 | 1,215
Total deferred tax liabilities | 3,579 | 4,825
Valuation Allowance | (44) | (37)
Net deferred tax asset/(liability) | $ (1,125) | $ (1,993)

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