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Segments and Geographic Information
 12 Months Ended
Dec. 26, 2020
Segment Reporting [Abstract]  
Segments and Geographic Information Segments and Geographic Information
We operate in two reportable segments consisting of the Probe Cards Segment and the Systems Segment.

Our chief operating decision maker ("CODM") is our Chief Executive Officer, who reviews operating results to make decisions about allocating resources and assessing performance for the entire company.


The following table summarizes the operating results by reportable segment (dollars in thousands):
Fiscal 2020
Probe CardsSystemsCorporate and OtherTotal
Revenues$581,739 $111,877 $— $693,616 
Gross profit$263,215 $51,835 $(27,130)$287,920 
Gross margin45.2 %46.3 %— %41.5 %

Fiscal 2019
Probe CardsSystemsCorporate and OtherTotal
Revenues$491,363 $98,101 $— $589,464 
Gross profit$211,382 $50,927 $(24,813)$237,496 
Gross margin43.0 %51.9 %— %40.3 %

Fiscal 2018
Probe CardsSystemsCorporate and OtherTotal
Revenues$434,269 $95,406 $— $529,675 
Gross profit$187,320 $47,074 $(24,055)$210,339 
Gross margin43.1 %
49.3%
— %39.7 %

Operating results provide useful information to our management for assessment of our performance and results of operations. Certain components of our operating results are utilized to determine executive compensation along with other measures.

Corporate and Other includes unallocated expenses relating to amortization of intangible assets, share-based compensation expense, acquisition-related costs, including charges related to inventory stepped up to fair value, and other costs, which are not used in evaluating the results of, or in allocating resources to, our reportable segments. Acquisition-related costs include transaction costs and any costs directly related to the acquisition and integration of acquired businesses.
The following table summarizes revenue, by geographic region, as a percentage of total revenues based upon ship-to location:
Fiscal Year Ended
December 26, 2020December 28, 2019December 29, 2018
China25.2 %18.0 %14.7 %
Taiwan21.7 14.7 20.3 
United States18.4 26.3 25.2 
South Korea12.5 19.8 17.2 
Europe9.5 7.0 7.5 
Japan6.3 8.9 9.4 
Asia-Pacific (1)
4.8 3.7 4.9 
Rest of World1.6 1.6 0.8 
Total Revenues100.0 %100.0 %100.0 %

(1)Asia-Pacific includes all countries in the region except Taiwan, South Korea, China, and Japan, which are disclosed separately.

The following table summarizes revenue by market (in thousands):
 Fiscal Year Ended
 December 26, 2020December 28, 2019December 29, 2018
Foundry & Logic$446,183 $318,552 $258,459 
DRAM109,734 147,257 135,333 
Flash25,822 25,554 40,477 
Systems111,877 98,101 95,406 
Total revenues$693,616 $589,464 $529,675 

The following table summarizes revenue by timing of revenue recognition (in thousands):

Fiscal Year Ended
December 26,
2020		December 28,
2019		December 29,
2018
Probe CardsSystemsTotalProbe CardsSystemsTotalProbe CardsSystemsTotal
Products transferred at a point in time$579,569 $104,858 $684,427 $488,925 $93,837 $582,762 $432,033 $91,514 $523,547 
Services transferred over time2,170 7,019 9,189 2,438 4,264 6,702 2,236 3,892 6,128 
Total$581,739 $111,877 $693,616 $491,363 $98,101 $589,464 $434,269 $95,406 $529,675 

Long-lived assets, comprised of Operating lease, right-of-use-assets, Property, plant and equipment, net, Goodwill and Intangibles, net, reported based on the location of the asset was as follows (in thousands):
December 26, 2020December 28, 2019December 29, 2018
United States$347,654 $287,600 $280,405 
Europe51,791 52,309 26,118 
Asia-Pacific7,322 7,064 4,385 
Total$406,767 $346,973 $310,908