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Income Taxes - Tax Effect of Temporary Differences and Carryforwards that Give Rise to Significant Portions of the Net Deferred Tax Assets (Details) - USD ($) $ in Thousands | Jan. 02, 2021 | Dec. 28, 2019
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Tax effect of temporary differences and carryforwards that give rise to significant portions of the net deferred tax assets |  |
Net operating losses | $ 11,769 | $ 10,426
Research and development credits | 3,273 | 3,175
Accruals and reserves | 2,382 | 2,334
Deferred revenue | 81 | 54
Property and equipment | 307 | 316
Intangible assets | 328 | 370
Stock compensation | 658 | 657
Net deferred tax asset | 18,798 | 17,332
Valuation allowance | (18,820) | (17,351)
Net deferred tax liabilities | $ (22) | $ (19)

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