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INCOME TAXES - Deferred income tax assets and liabilities (Details 3) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Deferred tax assets:    
Allowance for doubtful accounts $ 58 $ 78
Accruals and reserves 2,552 3,468
Other 222 179
Total deferred tax assets 2,832 3,725
Deferred tax liabilities:    
Property, plant, and equipment 3,610 2,499
Investments in foreign subsidiaries 1,215  
Total deferred tax liabilities 4,825 2,499
Net deferred tax asset/(liability) $ (1,993) $ 1,226