Income Taxes - Unrecognized tax benefits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Jan. 01, 2022	Jan. 02, 2021
Summary of the activity related to gross unrecognized tax benefits
Beginning balance	$ 3,677	$ 2,853	$ 2,276
Additions based on tax positions related to current year	872	830	577
Reductions based on tax positions related to prior years	(6)	(6)
Reductions for tax positions as a result of a lapse of the applicable statute of limitations	(434)
Ending balance	4,109	3,677	2,853
Unrecognized tax benefits, other disclosures
Gross unrecognized tax benefits, inclusive of interest	4,400	3,900	3,000
Gross unrecognized tax benefits which would affect the effective tax rate if recognized	$ 4,400	$ 3,900	$ 2,100