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Segments and Geographic Information - Revenue by Timing of Recognition (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2024
Dec. 30, 2023
Dec. 31, 2022
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues $ 763,599 $ 663,102 $ 747,937
Products transferred at a point in time      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 742,779 649,769 732,194
Services transferred over time      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 20,820 13,333 15,743
Probe Cards      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 625,960 497,903 591,422
Probe Cards | Products transferred at a point in time      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 620,598 494,624 587,738
Probe Cards | Services transferred over time      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 5,362 3,279 3,684
Systems      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 137,639 165,199  
Systems | Products transferred at a point in time      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues 122,181 155,145 144,456
Systems | Services transferred over time      
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]      
Revenues $ 15,458 $ 10,054 $ 12,059