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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 | Dec. 29, 2018 | Dec. 30, 2017
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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 | $ 8,195 | $ 5,757
Research and development credits | 3,048 | 2,839
Accruals and reserves | 2,357 | 2,031
Deferred revenue | 304 | 341
Property and equipment | 314 | 314
Intangible assets | 452 | 495
Stock compensation | 797 | 528
Other tax credits | 1 | 1
Net deferred tax asset | 15,468 | 12,306
Valuation allowance | (15,485) | (12,320)
Net deferred tax liabilities | $ (17) | $ (14)

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