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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Jan. 01, 2021
Deferred tax assets:    
Allowance for doubtful accounts and sales returns $ 195 $ 357
Inventories 444 691
Accrued vacation 581 599
Accrued other expenses 1,869 786
Stock-based compensation 2,146 3,277
Pensions 824 1,679
Net operating loss carryforwards 48,223 38,642
Business, foreign, AMT and R&D credit carryforwards 3,100 3,051
Prepaid expenses 272 280
Capitalized R&D 880 1,000
Operating lease liability 6,894 1,687
Other 67 19
Valuation allowance (51,794) (42,502)
Total deferred tax assets 13,701 9,566
Deferred tax liabilities:    
Foreign tax withholding (1,295) (1,295)
Operating lease ROU assets (6,862) (1,662)
Depreciation and amortization (888) (424)
Amortization of R&D (763) (846)
Net foreign earnings not permanently reinvested (891) (617)
Total deferred tax liabilities (10,699) (4,844)
Total net deferred tax assets $ 3,002 $ 4,722