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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		6 Months Ended
	Jun. 25, 2022	Jun. 26, 2021	Jun. 25, 2022	Jun. 26, 2021
Disaggregation of Revenue [Line Items]
Revenues	$ 203,907	$ 188,076	$ 401,081	$ 374,712
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	167,708	153,641	327,691	312,539
Systems
Disaggregation of Revenue [Line Items]
Revenues	36,199	34,435	73,390	62,173
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	50,020	51,884	103,089	97,464
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	45,188	46,737	87,710	91,471
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,832	5,147	15,379	5,993
China
Disaggregation of Revenue [Line Items]
Revenues	49,735	31,827	88,134	74,452
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	40,578	23,996	73,369	61,827
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	9,157	7,831	14,765	12,625
United States
Disaggregation of Revenue [Line Items]
Revenues	31,242	32,650	56,889	62,136
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	21,539	24,174	41,515	45,482
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	9,703	8,476	15,374	16,654
South Korea
Disaggregation of Revenue [Line Items]
Revenues	28,755	36,177	56,256	55,262
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	27,418	35,426	52,299	53,427
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,337	751	3,957	1,835
Malaysia
Disaggregation of Revenue [Line Items]
Revenues	16,244	3,195	38,443	23,125
Malaysia | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	16,157	3,034	37,674	22,922
Malaysia | Systems
Disaggregation of Revenue [Line Items]
Revenues	87	161	769	203
Japan
Disaggregation of Revenue [Line Items]
Revenues	9,937	7,704	19,319	17,025
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	6,716	3,477	11,501	8,726
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,221	4,227	7,818	8,299
Singapore
Disaggregation of Revenue [Line Items]
Revenues	7,108	9,962	18,004	18,520
Singapore | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,131	8,602	15,415	16,229
Singapore | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,977	1,360	2,589	2,291
Europe
Disaggregation of Revenue [Line Items]
Revenues	8,091	12,010	16,486	22,009
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	3,824	6,466	6,206	9,299
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,267	5,544	10,280	12,710
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	2,775	2,667	4,461	4,719
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,157	1,729	2,002	3,156
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,618	938	2,459	1,563
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	199,782	184,013	394,034	367,160
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	166,701	153,129	325,537	311,605
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	33,081	30,884	68,497	55,555
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	4,125	4,063	7,047	7,552
Products and services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	1,007	512	2,154	934
Products and services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,118	3,551	4,893	6,618
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	122,380	103,726	236,501	217,136
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	122,380	103,726	236,501	217,136
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	36,843	42,088	71,280	75,986
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	36,843	42,088	71,280	75,986
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	8,485	7,827	19,910	19,417
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	8,485	7,827	19,910	19,417
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	36,199	34,435	73,390	62,173
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 36,199	$ 34,435	$ 73,390	$ 62,173

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