Segment Information - Segment information by geographic area (Details) $ in Thousands	12 Months Ended
	Dec. 28, 2024 USD ($) segment	Dec. 30, 2023 USD ($)	Dec. 31, 2022 USD ($)
Segment Information
Number of operating segments | segment	1
Revenues	$ 584,386	$ 782,258	$ 1,024,106
Property and equipment, net	132,136	145,890
United States
Segment Information
Revenues	56,493	92,550	176,379
Property and equipment, net	107,612	116,357
China
Segment Information
Revenues	188,169	219,741	334,821
Taiwan
Segment Information
Revenues	77,430	90,382	105,602
Rest of world
Segment Information
Revenues	262,294	379,585	$ 407,304
Property and equipment, net	$ 24,524	$ 29,533