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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. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Disaggregation of Revenue [Line Items]
Revenues	$ 188,076	$ 157,824	$ 374,712	$ 318,577
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	153,641	133,784	312,539	268,499
Systems
Disaggregation of Revenue [Line Items]
Revenues	34,435	24,040	62,173	50,078
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	51,884	33,171	55,262	29,201
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	46,737	29,806	53,427	27,941
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,147	3,365	1,835	1,260
South Korea
Disaggregation of Revenue [Line Items]
Revenues	36,177	15,113	97,464	64,951
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	35,426	14,249	91,471	60,245
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	751	864	5,993	4,706
United States
Disaggregation of Revenue [Line Items]
Revenues	32,650	28,121	62,136	60,037
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	24,174	22,368	45,482	47,979
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	8,476	5,753	16,654	12,058
China
Disaggregation of Revenue [Line Items]
Revenues	31,827	48,758	74,452	92,400
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	23,996	45,625	61,827	82,905
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	7,831	3,133	12,625	9,495
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues	14,288	6,500	17,025	18,429
Asia-Pacific | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	12,569	4,347	8,726	12,214
Asia-Pacific | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,719	2,153	8,299	6,215
Europe
Disaggregation of Revenue [Line Items]
Revenues	12,010	14,132	22,009	35,175
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	6,466	8,767	9,299	24,977
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,544	5,365	12,710	10,198
Japan
Disaggregation of Revenue [Line Items]
Revenues	7,704	10,059	43,246	14,363
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	3,477	6,679	40,447	8,802
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,227	3,380	2,799	5,561
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	1,536	1,970	3,118	4,021
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	796	1,943	1,860	3,436
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	740	27	1,258	585
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	184,013	155,756	367,160	314,683
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	153,129	133,208	311,605	267,277
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	30,884	22,548	55,555	47,406
Products and services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	4,063	2,068	7,552	3,894
Products and services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	512	576	934	1,222
Products and services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,551	1,492	6,618	2,672
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	103,726	109,347	217,136	215,092
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	103,726	109,347	217,136	215,092
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	42,088	19,052	75,986	43,748
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	42,088	19,052	75,986	43,748
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	7,827	5,385	19,417	9,659
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	7,827	5,385	19,417	9,659
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	34,435	24,040	62,173	50,078
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 34,435	$ 24,040	$ 62,173	$ 50,078

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