Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 24, 2022	Sep. 30, 2023	Sep. 24, 2022
Segment Reporting Information [Line Items]
Revenues	$ 171,575	$ 180,869	$ 494,939	$ 581,950
Gross profit	$ 69,285	$ 62,213	$ 190,646	$ 250,806
Gross margin	40.40%	34.40%	38.50%	43.10%
Probe Cards
Segment Reporting Information [Line Items]
Revenues	$ 128,339	$ 139,365	$ 370,970	$ 467,056
Systems
Segment Reporting Information [Line Items]
Revenues	43,236	41,504	123,969	114,894
Operating segments | Probe Cards
Segment Reporting Information [Line Items]
Revenues	128,339	139,365	370,970	467,056
Gross profit	$ 49,383	$ 48,252	$ 135,118	$ 203,874
Gross margin	38.50%	34.60%	36.40%	43.70%
Operating segments | Systems
Segment Reporting Information [Line Items]
Revenues	$ 43,236	$ 41,504	$ 123,969	$ 114,894
Gross profit	$ 22,396	$ 22,284	$ 64,266	$ 59,967
Gross margin	51.80%	53.70%	51.80%	52.20%
Operating segments | Corporate and Other
Segment Reporting Information [Line Items]
Revenues	$ 0	$ 0	$ 0	$ 0
Gross profit	$ (2,494)	$ (8,323)	$ (8,738)	$ (13,035)
Gross margin