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Operating Segments and Enterprise-Wide Information - Revenue by Geography (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Segment Reporting Information [Line Items]
Revenues	$ 160,753	$ 132,213
United States
Segment Reporting Information [Line Items]
Revenues	31,916	34,263
Taiwan
Segment Reporting Information [Line Items]
Revenues	31,780	22,387
South Korea
Segment Reporting Information [Line Items]
Revenues	14,088	26,723
Asia-Pacific
Segment Reporting Information [Line Items]
Revenues	7,863	3,263
Europe
Segment Reporting Information [Line Items]
Revenues	21,043	9,493
Japan
Segment Reporting Information [Line Items]
Revenues	8,370	10,432
China
Segment Reporting Information [Line Items]
Revenues	43,642	21,843
Rest of the world
Segment Reporting Information [Line Items]
Revenues	2,051	3,809
Probe Cards
Segment Reporting Information [Line Items]
Revenues	134,715	108,103
Probe Cards | United States
Segment Reporting Information [Line Items]
Revenues	25,611	27,655
Probe Cards | Taiwan
Segment Reporting Information [Line Items]
Revenues	30,439	21,257
Probe Cards | South Korea
Segment Reporting Information [Line Items]
Revenues	13,692	25,018
Probe Cards | Asia-Pacific
Segment Reporting Information [Line Items]
Revenues	4,455	2,790
Probe Cards | Europe
Segment Reporting Information [Line Items]
Revenues	16,210	5,373
Probe Cards | Japan
Segment Reporting Information [Line Items]
Revenues	5,535	5,300
Probe Cards | China
Segment Reporting Information [Line Items]
Revenues	37,280	18,151
Probe Cards | Rest of the world
Segment Reporting Information [Line Items]
Revenues	1,493	2,559
Systems
Segment Reporting Information [Line Items]
Revenues	26,038	24,110
Systems | United States
Segment Reporting Information [Line Items]
Revenues	6,305	6,608
Systems | Taiwan
Segment Reporting Information [Line Items]
Revenues	1,341	1,130
Systems | South Korea
Segment Reporting Information [Line Items]
Revenues	396	1,705
Systems | Asia-Pacific
Segment Reporting Information [Line Items]
Revenues	3,408	473
Systems | Europe
Segment Reporting Information [Line Items]
Revenues	4,833	4,120
Systems | Japan
Segment Reporting Information [Line Items]
Revenues	2,835	5,132
Systems | China
Segment Reporting Information [Line Items]
Revenues	6,362	3,692
Systems | Rest of the world
Segment Reporting Information [Line Items]
Revenues	558	1,250
Foundry & Logic
Segment Reporting Information [Line Items]
Revenues	105,745	71,580
Foundry & Logic | Probe Cards
Segment Reporting Information [Line Items]
Revenues	105,745	71,580
Foundry & Logic | Systems
Segment Reporting Information [Line Items]
Revenues	0	0
DRAM
Segment Reporting Information [Line Items]
Revenues	24,696	28,886
DRAM | Probe Cards
Segment Reporting Information [Line Items]
Revenues	24,696	28,886
DRAM | Systems
Segment Reporting Information [Line Items]
Revenues	0	0
Flash
Segment Reporting Information [Line Items]
Revenues	4,274	7,637
Flash | Probe Cards
Segment Reporting Information [Line Items]
Revenues	4,274	7,637
Flash | Systems
Segment Reporting Information [Line Items]
Revenues	0	0
Systems
Segment Reporting Information [Line Items]
Revenues	26,038	24,110
Systems | Probe Cards
Segment Reporting Information [Line Items]
Revenues	0	0
Systems | Systems
Segment Reporting Information [Line Items]
Revenues	26,038	24,110
Products transferred at a point in time
Segment Reporting Information [Line Items]
Revenues	158,927	130,633
Products transferred at a point in time | Probe Cards
Segment Reporting Information [Line Items]
Revenues	134,069	107,491
Products transferred at a point in time | Systems
Segment Reporting Information [Line Items]
Revenues	24,858	23,142
Services transferred over time
Segment Reporting Information [Line Items]
Revenues	1,826	1,580
Services transferred over time | Probe Cards
Segment Reporting Information [Line Items]
Revenues	646	612
Services transferred over time | Systems
Segment Reporting Information [Line Items]
Revenues	$ 1,180	$ 968

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- Definition

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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No definition available.

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