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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. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Segment Reporting Information [Line Items]
Revenues	$ 188,076	$ 157,824	$ 374,712	$ 318,577
Gross profit	$ 76,283	$ 66,167	$ 152,989	$ 133,557
Gross margin	40.60%	41.90%	40.80%	41.90%
Probe Cards
Segment Reporting Information [Line Items]
Revenues	$ 153,641	$ 133,784	$ 312,539	$ 268,499
Systems
Segment Reporting Information [Line Items]
Revenues	34,435	24,040	62,173	50,078
Corporate and Other
Segment Reporting Information [Line Items]
Revenues			0	0
Gross profit			$ (14,432)	$ (12,762)
Gross margin
Operating segments | Probe Cards
Segment Reporting Information [Line Items]
Revenues	153,641	133,784	$ 312,539	$ 268,499
Gross profit	$ 66,600	$ 61,523	$ 136,915	$ 122,266
Gross margin	43.30%	46.00%	43.80%	45.50%
Operating segments | Systems
Segment Reporting Information [Line Items]
Revenues	$ 34,435	$ 24,040	$ 62,173	$ 50,078
Gross profit	$ 16,907	$ 10,719	$ 30,506	$ 24,053
Gross margin	49.10%	44.60%	49.10%	48.00%
Operating segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0
Gross profit	$ (7,224)	$ (6,075)
Gross margin

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