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Operating Segments and Enterprise-Wide Information - Revenue by Segment, Recognition Type, and Geographic Area (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 26, 2022	Mar. 27, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 197,174	$ 186,636
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	159,983	158,898
Systems
Disaggregation of Revenue [Line Items]
Revenues	37,191	27,738
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	53,069	45,580
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	42,522	44,734
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	10,547	846
China
Disaggregation of Revenue [Line Items]
Revenues	38,399	42,625
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	32,791	37,831
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,608	4,794
South Korea
Disaggregation of Revenue [Line Items]
Revenues	27,501	19,085
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	24,881	18,001
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	2,620	1,084
Malaysia
Disaggregation of Revenue [Line Items]
Revenues	22,199	19,930
Malaysia | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	21,517	19,888
Malaysia | Systems
Disaggregation of Revenue [Line Items]
Revenues	682	42
United States
Disaggregation of Revenue [Line Items]
Revenues	25,647	29,486
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	19,976	21,308
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,671	8,178
Singapore
Disaggregation of Revenue [Line Items]
Revenues	10,896	8,558
Singapore | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	10,284	7,627
Singapore | Systems
Disaggregation of Revenue [Line Items]
Revenues	612	931
Japan
Disaggregation of Revenue [Line Items]
Revenues	9,382	9,321
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	4,785	5,249
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,597	4,072
Europe
Disaggregation of Revenue [Line Items]
Revenues	8,395	9,999
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	2,382	2,833
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	6,013	7,166
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	1,686	2,052
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	845	1,427
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	841	625
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	194,252	183,147
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	158,836	158,476
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	35,416	24,671
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	2,922	3,489
Products and services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,147	422
Products and services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,775	3,067
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	114,121	113,410
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	114,121	113,410
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	34,437	33,898
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	34,437	33,898
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	11,425	11,590
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	11,425	11,590
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	37,191	27,738
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 37,191	$ 27,738

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