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Income Taxes - Components of deferred tax assets and deferred tax liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Deferred tax assets:    
Inventory $ 2,955 $ 4,426
Tax credit carryforwards 0 7,780
Operating loss carryforward-statutory tax 755 1,013
Accrued compensated absences 901 735
Allowance for sales discounts 720 411
Depreciation 601 561
Unrealized foreign exchange loss 0 179
Others 1,259 634
Deferred tax assets 7,191 15,739
Deferred tax liabilities:    
Acquired intangible assets (756) (1,014)
Remeasurement of defined benefit plans (138) (107)
Unrealized foreign exchange gain (71) (17)
Deferred tax liabilities $ (965) $ (1,138)