Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 29, 2018	Dec. 30, 2017	Dec. 31, 2016	Dec. 31, 2015
Income Taxes [Line Items]
Corporate federal income tax rate	21.00%	34.00%
Accrued interest and penalty	$ 0
Ending balance of unrecognized tax benefits	1,155,000	$ 1,105,000	$ 1,029,000
Unrecognized tax benefits recognition impact on income tax rate	$ 0
Earliest Tax Year
Income Taxes [Line Items]
Open Tax Year	2011
Latest Tax Year
Income Taxes [Line Items]
Open Tax Year	2017
Maximum
Income Taxes [Line Items]
Corporate federal income tax rate		35.00%
Federal
Income Taxes [Line Items]
Net operating loss	$ 32,300,000
Net operating loss expiration year	2033
Research credit				$ 1,900,000
State
Income Taxes [Line Items]
Net operating loss	$ 21,100,000
Net operating loss expiration year	2021
Research credit				$ 2,700,000