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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 28, 2024
Sep. 30, 2023
Sep. 28, 2024
Sep. 30, 2023
Segment Reporting Information [Line Items]        
Revenues $ 207,917 $ 171,575 $ 574,116 $ 494,939
Gross profit $ 84,705 $ 69,285 $ 234,343 $ 190,646
Gross margin 40.70% 40.40% 40.80% 38.50%
Systems        
Segment Reporting Information [Line Items]        
Revenues $ 35,743 $ 43,236 $ 98,449 $ 123,969
Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 172,174 128,339 475,667 370,970
Probe Cards | Systems        
Segment Reporting Information [Line Items]        
Revenues 0 0 0 0
Systems        
Segment Reporting Information [Line Items]        
Revenues 35,743 43,236 98,449 123,969
Systems | Systems        
Segment Reporting Information [Line Items]        
Revenues 35,743 43,236 98,449 123,969
Operating segments | Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 172,174 128,339 475,667 370,970
Gross profit $ 72,855 $ 49,383 $ 198,885 $ 135,118
Gross margin 42.30% 38.50% 41.80% 36.40%
Operating segments | Systems        
Segment Reporting Information [Line Items]        
Revenues $ 35,743 $ 43,236    
Gross profit $ 14,838 $ 22,396 $ 43,521 $ 64,266
Gross margin 41.50% 51.80% 44.20% 51.80%
Operating segments | Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues $ 0 $ 0 $ 0 $ 0
Gross profit $ (2,988) $ (2,494) $ (8,063) $ (8,738)