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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. 30, 2017 | Dec. 31, 2016
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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 | $ 5,757 | $ 4,411
Research and development credits | 2,839 | 2,113
Accruals and reserves | 2,031 | 2,158
Deferred revenue | 341 | 104
Property and equipment | 314 | 396
Intangible assets | 495 | 783
Stock compensation | 528 | 972
Other tax credits | 1 | 90
Net deferred tax asset | 12,306 | 11,027
Valuation allowance | (12,320) | (11,095)
Net deferred tax liabilities | $ (14) | $ (68)

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