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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. 26, 2020	Sep. 28, 2019	Sep. 26, 2020	Sep. 28, 2019
Disaggregation of Revenue [Line Items]
Revenues	$ 177,996	$ 140,604	$ 496,573	$ 410,835
Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	150,773	116,447	419,272	338,187
Systems
Disaggregation of Revenue [Line Items]
Revenues	27,223	24,157	77,301	72,648
China
Disaggregation of Revenue [Line Items]
Revenues	28,546	31,383	120,946	73,581
China | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	24,851	24,427	107,756	58,882
China | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,695	6,956	13,190	14,699
Taiwan
Disaggregation of Revenue [Line Items]
Revenues	36,935	18,255	58,772	78,491
Taiwan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	33,351	16,513	56,278	75,157
Taiwan | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,584	1,742	2,494	3,334
United States
Disaggregation of Revenue [Line Items]
Revenues	36,328	33,665	96,365	106,297
United States | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	31,596	28,400	79,575	88,127
United States | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,732	5,265	16,790	18,170
South Korea
Disaggregation of Revenue [Line Items]
Revenues	29,571	23,597	101,886	55,514
South Korea | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	28,337	22,779	93,596	50,596
South Korea | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,234	818	8,290	4,918
Europe
Disaggregation of Revenue [Line Items]
Revenues	16,979	9,548	52,154	29,689
Europe | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	11,679	5,754	36,656	15,601
Europe | Systems
Disaggregation of Revenue [Line Items]
Revenues	5,300	3,794	15,498	14,088
Japan
Disaggregation of Revenue [Line Items]
Revenues	17,145	16,929	23,317	16,611
Japan | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	12,288	13,640	14,307	12,568
Japan | Systems
Disaggregation of Revenue [Line Items]
Revenues	4,857	3,289	9,010	4,043
Asia-Pacific
Disaggregation of Revenue [Line Items]
Revenues	8,954	5,665	35,574	43,454
Asia-Pacific | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	5,505	3,516	24,502	31,807
Asia-Pacific | Systems
Disaggregation of Revenue [Line Items]
Revenues	3,449	2,149	11,072	11,647
Rest of the world
Disaggregation of Revenue [Line Items]
Revenues	3,538	1,562	7,559	7,198
Rest of the world | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	3,166	1,418	6,602	5,449
Rest of the world | Systems
Disaggregation of Revenue [Line Items]
Revenues	372	144	957	1,749
Products transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenues	176,239	138,885	490,922	405,885
Products transferred at a point in time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	150,252	115,324	417,529	335,054
Products transferred at a point in time | Systems
Disaggregation of Revenue [Line Items]
Revenues	25,987	23,561	73,393	70,831
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenues	1,757	1,719	5,651	4,950
Services transferred over time | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	521	1,123	1,743	3,133
Services transferred over time | Systems
Disaggregation of Revenue [Line Items]
Revenues	1,236	596	3,908	1,817
Foundry & Logic
Disaggregation of Revenue [Line Items]
Revenues	108,411	68,431	323,503	213,453
Foundry & Logic | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	108,411	68,431	323,503	213,453
Foundry & Logic | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
DRAM
Disaggregation of Revenue [Line Items]
Revenues	31,379	39,425	75,127	104,355
DRAM | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	31,379	39,425	75,127	104,355
DRAM | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Flash
Disaggregation of Revenue [Line Items]
Revenues	10,983	8,591	20,642	20,379
Flash | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	10,983	8,591	20,642	20,379
Flash | Systems
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems
Disaggregation of Revenue [Line Items]
Revenues	27,223	24,157	77,301	72,648
Systems | Probe Cards
Disaggregation of Revenue [Line Items]
Revenues	0	0	0	0
Systems | Systems
Disaggregation of Revenue [Line Items]
Revenues	$ 27,223	$ 24,157	$ 77,301	$ 72,648

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