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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Jan. 03, 2020 | Dec. 28, 2018
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts and sales returns | $ 233 | $ 252
Inventories | 703 | 560
Accrued vacation | 428 | 387
Accrued other expenses | 1,036 | 1,232
Stock-based compensation | 3,455 | 2,489
Pensions | 1,159 | 884
Depreciation and amortization | 162 | 843
Net operating loss carryforwards | 32,251 | 34,347
Business, foreign, AMT and R and D credit carryforwards | 3,164 | 3,256
Prepaid expenses | 272 | 272
Capitalized R&D | 986 | 968
Operating lease liability | 1,309 |
Other | 5 | 122
Valuation allowance | (37,603) | (43,075)
Total deferred tax assets | 7,560 | 2,537
Deferred tax liabilities: |  |
Foreign tax withholding | (1,295) | (1,282)
Operating lease ROU assets | (1,309) |
Amortization of R&D | (805) | (759)
Net foreign earnings not permanently reinvested | (401) | (240)
Total deferred tax liabilities | (3,810) | (2,281)
Total net deferred tax assets | $ 3,750 | $ 256

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