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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. 01, 2022 | Jan. 02, 2021
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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 | $ 13,751 | $ 11,769
Research and development credits | 3,582 | 3,273
Accruals and reserves | 2,637 | 2,382
Deferred revenue | 82 | 81
Property and equipment | 361 | 307
Intangible assets | 268 | 328
Stock compensation | 574 | 658
Net deferred tax asset | 21,255 | 18,798
Valuation allowance | (21,280) | (18,820)
Net deferred tax liabilities | $ (25) | $ (22)

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