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Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 28, 2019	Dec. 29, 2018	Dec. 30, 2017
Income Taxes [Line Items]
Accrued interest and penalty	$ 0
Ending balance of unrecognized tax benefits	1,192,000	$ 1,155,000	$ 1,105,000
Unrecognized tax benefits recognition impact on income tax rate	$ 0
Earliest Tax Year
Income Taxes [Line Items]
Open Tax Year	2010
Latest Tax Year
Income Taxes [Line Items]
Open Tax Year	2019
Federal
Income Taxes [Line Items]
Net operating loss	$ 41,900,000
Net operating loss expiration year	2033
Federal | Research Tax Credit Carryforward
Income Taxes [Line Items]
Research credit	$ 2,000,000
State
Income Taxes [Line Items]
Net operating loss	$ 24,200,000
Net operating loss expiration year	2021
State | Research Tax Credit Carryforward
Income Taxes [Line Items]
Research credit	$ 2,800,000

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Income taxes.

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