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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. 25, 2022
Jun. 26, 2021
Jun. 25, 2022
Jun. 26, 2021
Segment Reporting Information [Line Items]        
Revenues $ 203,907 $ 188,076 $ 401,081 $ 374,712
Gross profit $ 94,369 $ 76,283 $ 188,593 $ 152,989
Gross margin 46.30% 40.60% 47.00% 40.80%
Probe Cards        
Segment Reporting Information [Line Items]        
Revenues $ 167,708 $ 153,641 $ 327,691 $ 312,539
Systems        
Segment Reporting Information [Line Items]        
Revenues 36,199 34,435 73,390 62,173
Operating segments | Probe Cards        
Segment Reporting Information [Line Items]        
Revenues 167,708 153,641 327,691 312,539
Gross profit $ 78,420 $ 66,600 $ 155,622 $ 136,915
Gross margin 46.80% 43.30% 47.50% 43.80%
Operating segments | Systems        
Segment Reporting Information [Line Items]        
Revenues $ 36,199 $ 34,435 $ 73,390 $ 62,173
Gross profit $ 18,276 $ 16,907 $ 37,683 $ 30,506
Gross margin 50.50% 49.10% 51.30% 49.10%
Operating segments | Corporate and Other        
Segment Reporting Information [Line Items]        
Revenues $ 0 $ 0 $ 0 $ 0
Gross profit $ (2,327) $ (7,224) $ (4,712) $ (14,432)
Gross margin