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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 30, 2024
Apr. 01, 2023
Segment Reporting Information [Line Items]    
Revenues $ 168,725 $ 167,448
Gross profit $ 62,738 $ 61,078
Gross margin 37.20% 36.50%
Probe Cards    
Segment Reporting Information [Line Items]    
Revenues $ 136,701 $ 127,328
Systems    
Segment Reporting Information [Line Items]    
Revenues 32,024 40,120
Operating segments | Probe Cards    
Segment Reporting Information [Line Items]    
Revenues 136,701 127,328
Gross profit $ 50,791 $ 43,623
Gross margin 37.20% 34.30%
Operating segments | Systems    
Segment Reporting Information [Line Items]    
Revenues $ 32,024 $ 40,120
Gross profit $ 14,506 $ 20,746
Gross margin 45.30% 51.70%
Operating segments | Corporate and Other    
Segment Reporting Information [Line Items]    
Revenues $ 0 $ 0
Gross profit $ (2,559) $ (3,291)
Gross margin