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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Jan. 01, 2021
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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

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