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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 29, 2024
Jul. 01, 2023
Jun. 29, 2024
Jul. 01, 2023
Segment Reporting Information [Line Items]        
Revenues $ 197,474 $ 155,916 $ 366,199 $ 323,364
Gross profit $ 86,900 $ 60,283 $ 149,638 $ 121,361
Gross margin 44.00% 38.70% 40.90% 37.50%
Systems        
Segment Reporting Information [Line Items]        
Revenues $ 30,682 $ 40,613 $ 62,706 $ 80,733
Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 166,792 115,303 303,493 242,631
Probe Cards | Systems        
Segment Reporting Information [Line Items]        
Revenues 0 0 0 0
Systems        
Segment Reporting Information [Line Items]        
Revenues 30,682 40,613 62,706 80,733
Systems | Systems        
Segment Reporting Information [Line Items]        
Revenues 30,682 40,613 62,706 80,733
Operating segments | Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 166,792 115,303 303,493 242,631
Gross profit $ 75,239 $ 42,112 $ 126,030 $ 85,735
Gross margin 45.10% 36.50% 41.50% 35.30%
Operating segments | Systems        
Segment Reporting Information [Line Items]        
Revenues $ 30,682 $ 40,613    
Gross profit $ 14,177 $ 21,124 $ 28,683 $ 41,870
Gross margin 46.20% 52.00% 45.70% 51.90%
Operating segments | Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues $ 0 $ 0 $ 0 $ 0
Gross profit $ (2,516) $ (2,953) $ (5,075) $ (6,244)