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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		9 Months Ended
	Sep. 24, 2022	Sep. 25, 2021	Sep. 24, 2022	Sep. 25, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 180,869	$ 189,964	$ 581,950	$ 564,676
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	139,365	154,850	467,056	467,389
Systems
Disaggregation of Revenue [Line Items]
Revenues	41,504	35,114	114,894	97,287
United States
Disaggregation of Revenue [Line Items]
Revenues	38,089	25,468	94,978	87,604
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	25,909	18,530	67,424	64,012
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	12,180	6,938	27,554	23,592
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	36,838	41,574	139,927	139,038
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	32,227	34,100	119,937	125,571
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,611	7,474	19,990	13,467
China
Disaggregation of Revenue [Line Items]
Revenues	36,728	51,047	124,862	125,499
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	27,973	46,011	101,342	107,838
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	8,755	5,036	23,520	17,661
South Korea
Disaggregation of Revenue [Line Items]
Revenues	28,937	28,972	85,193	84,234
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	28,118	27,895	80,417	81,322
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	819	1,077	4,776	2,912
Europe
Disaggregation of Revenue [Line Items]
Revenues	11,798	10,486	28,284	32,495
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	3,682	3,595	9,888	12,894
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	8,116	6,891	18,396	19,601
Singapore
Disaggregation of Revenue [Line Items]
Revenues	10,357	7,552	28,361	26,072
Singapore | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	7,983	6,841	23,398	23,070
Singapore | Systems
Disaggregation of Revenue [Line Items]
Revenues	2,374	711	4,963	3,002
Japan
Disaggregation of Revenue [Line Items]
Revenues	7,692	10,728	27,011	27,753
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	4,533	5,767	16,034	14,493
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,159	4,961	10,977	13,260
Malaysia
Disaggregation of Revenue [Line Items]
Revenues	6,509	11,633	44,952	34,758
Malaysia | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	6,272	11,353	43,946	34,275
Malaysia | Systems
Disaggregation of Revenue [Line Items]
Revenues	237	280	1,006	483
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	3,921	2,504	8,382	7,223
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	2,668	758	4,670	3,914
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,253	1,746	3,712	3,309
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	176,444	187,781	570,478	554,941
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	138,602	154,217	464,139	465,822
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	37,842	33,564	106,339	89,119
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	4,425	2,183	11,472	9,735
Products and services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	763	633	2,917	1,567
Products and services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,662	1,550	8,555	8,168
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	90,605	104,640	327,106	321,776
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	90,605	104,640	327,106	321,776
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	34,922	39,816	106,202	115,802
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	34,922	39,816	106,202	115,802
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	13,838	10,394	33,748	29,811
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	13,838	10,394	33,748	29,811
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	41,504	35,114	114,894	97,287
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 41,504	$ 35,114	$ 114,894	$ 97,287

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