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Income Taxes - components of deferred tax assets and deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Deferred tax assets:    
Inventory $ 4,426 $ 5,089
Tax credit carryforwards 7,780 5,645
Operating loss carryforward-statutory tax 1,013 1,254
Accrued compensated absences 735 588
Allowance for sales discounts 411 576
Depreciation 561 521
Unrealized foreign exchange loss 179 102
Others 634 658
Deferred tax assets 15,739 14,433
Deferred tax liabilities:    
Acquired intangible assets (1,014) (1,255)
Remeasurement of defined benefit plans (107) (139)
Unrealized foreign exchange gain (17) 0
Deferred tax liabilities $ (1,138) $ (1,394)