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Segments and Geographic Information - Operating Results By Segment (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2022
USD ($)
segment
Dec. 25, 2021
USD ($)
Dec. 26, 2020
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 2    
Segment Reporting Information [Line Items]      
Revenues $ 747,937 $ 769,674 $ 693,616
Gross profit $ 296,009 $ 322,767 $ 287,920
Gross margin 39.60% 41.90% 41.50%
Probe Cards      
Segment Reporting Information [Line Items]      
Revenues $ 591,422 $ 633,281 $ 581,739
Systems      
Segment Reporting Information [Line Items]      
Revenues 156,515 136,393 111,877
Operating Segments | Probe Cards      
Segment Reporting Information [Line Items]      
Revenues 591,422 633,281 581,739
Gross profit $ 235,562 $ 279,873 $ 263,215
Gross margin 39.80% 44.20% 45.20%
Operating Segments | Systems      
Segment Reporting Information [Line Items]      
Revenues $ 156,515 $ 136,393 $ 111,877
Gross profit $ 80,937 $ 65,834 $ 51,835
Gross margin 51.70% 48.30% 46.30%
Corporate and Other      
Segment Reporting Information [Line Items]      
Revenues $ 0 $ 0 $ 0
Gross profit $ (20,490) $ (22,940) $ (27,130)