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Operating Segments and Enterprise-Wide Information
 3 Months Ended
Mar. 27, 2021
Segment Reporting [Abstract]  
Operating Segments and Enterprise-Wide Information Operating Segments and Enterprise-Wide Information
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. We operate in two reportable segments consisting of the Probe Cards segment and the Systems segment. The following table summarizes the operating results by reportable segment (dollars in thousands):
Three Months Ended
March 27, 2021March 28, 2020
Probe CardsSystemsCorporate and OtherTotalProbe CardsSystemsCorporate and OtherTotal
Revenues$158,898 $27,738 $— $186,636 $134,715 $26,038 $— $160,753 
Gross profit $70,315 $13,599 $(7,208)$76,706 $60,743 $13,334 $(6,687)$67,390 
Gross margin44.3 %49.0 %— %41.1 %45.1 %51.2 %— %41.9 %


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, inventory and fixed asset fair value adjustments due to acquisitions and share-based compensation, which are not used in evaluating the results of, or in allocating resources to, our reportable segments.

Certain revenue category information by reportable segment was as follows (in thousands):
Three Months Ended
March 27, 2021March 28, 2020
Probe CardsSystemsTotalProbe CardsSystemsTotal
Market:
Foundry & Logic$113,410 $— $113,410 $105,745 $— $105,745 
DRAM33,898 — 33,898 24,696 — 24,696 
Flash11,590 — 11,590 4,274 — 4,274 
Systems— 27,738 27,738 — 26,038 26,038 
Total$158,898 $27,738 $186,636 $134,715 $26,038 $160,753 
Timing of revenue recognition:
Products transferred at a point in time$158,476 $24,671 $183,147 $134,069 $24,858 $158,927 
Products and services transferred over time422 3,067 3,489 646 1,180 1,826 
Total$158,898 $27,738 $186,636 $134,715 $26,038 $160,753 
Geographical region:
Taiwan$44,734 $846 $45,580 $30,439 $1,341 $31,780 
China37,831 4,794 42,625 37,280 6,362 43,642 
United States21,308 8,178 29,486 25,611 6,305 31,916 
Asia-Pacific1
27,878 1,080 28,958 4,455 3,408 7,863 
South Korea18,001 1,084 19,085 13,692 396 14,088 
Europe2,833 7,166 9,999 16,210 4,833 21,043 
Japan5,249 4,072 9,321 5,535 2,835 8,370 
Rest of the world1,064 518 1,582 1,493 558 2,051 
Total$158,898 $27,738 $186,636 $134,715 $26,038 $160,753 


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