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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. 28, 2019	Dec. 29, 2018
Tax effect of temporary differences and carryforwards that give rise to significant portions of the net deferred tax assets
Net operating losses	$ 10,426	$ 8,195
Research and development credits	3,175	3,048
Accruals and reserves	2,334	2,357
Deferred revenue	54	304
Property and equipment	316	314
Intangible assets	370	452
Stock compensation	657	797
Other tax credits		1
Net deferred tax asset	17,332	15,468
Valuation allowance	(17,351)	(15,485)
Net deferred tax liabilities	$ (19)	$ (17)

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