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Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 28, 2018 | Dec. 29, 2017
--- | --- | ---
Deferred tax assets: |  |
Allowance for doubtful accounts and sales returns | $ 252 | $ 230
Inventories | 560 | 381
Accrued vacation | 387 | 322
Accrued other expenses | 1,232 | 559
Stock-based compensation | 2,489 | 1,444
Pensions | 884 | 720
Depreciation and amortization | 843 | 959
Net operating loss carryforwards | 34,347 | 33,770
Business, foreign, AMT and R and D credit carryforwards | 3,256 | 3,706
Prepaid expenses | 272 | 188
Capitalized R&D | 968 | 941
Other | 122 | 92
Valuation allowance | (43,075) | (40,656)
Total deferred tax assets | 2,537 | 2,656
Deferred tax liabilities: |  |
Foreign tax withholding | (1,282) | (881)
Amortization of R&D | (759) | (723)
Net foreign earnings not permanently reinvested | (240) | (160)
Total deferred tax liabilities | (2,281) | (1,764)
Total net deferred tax assets | $ 256 | $ 892

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