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Operating Segments and Enterprise-Wide Information - Operating Results by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 160,753	$ 132,213
Gross profit	$ 67,390	$ 52,521
Gross margin	41.90%	39.70%
Probe Cards
Segment Reporting Information [Line Items]
Revenues	$ 134,715	$ 108,103
Systems
Segment Reporting Information [Line Items]
Revenues	26,038	24,110
Corporate and Other
Segment Reporting Information [Line Items]
Revenues	0	0
Gross profit	$ (6,687)	$ (5,789)
Gross margin	0.00%	0.00%
Operating Segments | Probe Cards
Segment Reporting Information [Line Items]
Revenues	$ 134,715	$ 108,103
Gross profit	$ 60,743	$ 45,294
Gross margin	45.10%	41.90%
Operating Segments | Systems
Segment Reporting Information [Line Items]
Revenues	$ 26,038	$ 24,110
Gross profit	$ 13,334	$ 13,016
Gross margin	51.20%	54.00%

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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-Topic 606
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