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Income Taxes - components of deferred tax assets and deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Deferred tax assets:    
Inventory $ 5,089 $ 5,996
Tax credit carryforwards 5,645 3,567
Operating loss carryforward-statutory tax 1,254 2,166
Accrued compensated absences 588 553
Allowance for sales discounts 576 685
Depreciation 521 481
Unrealized foreign exchange loss 102 8
Others 658 448
Deferred tax assets 14,433 13,904
Deferred tax liabilities:    
Acquired intangible assets (1,255) (1,645)
Remeasurement of defined benefit plans (139) (114)
Deferred tax liabilities $ (1,394) $ (1,759)