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Operating Segments and Enterprise-Wide Information
 9 Months Ended
Sep. 25, 2021
Segment Reporting [Abstract]  
Operating Segments and Enterprise-Wide Information Operating Segments and Enterprise-Wide InformationOur 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
September 25, 2021September 26, 2020
Probe CardsSystemsCorporate and OtherTotalProbe CardsSystemsCorporate and OtherTotal
Revenues$154,850 $35,114 $— $189,964 $150,773 $27,223 $— $177,996 
Gross profit $69,868 $17,553 $(7,202)$80,219 $69,641 $13,565 $(6,457)$76,749 
Gross margin45.1 %50.0 %42.2 %46.2 %49.8 %43.1 %
Nine Months Ended
September 25, 2021September 26, 2020
Probe CardsSystemsCorporate and OtherTotalProbe CardsSystemsCorporate and OtherTotal
Revenues$467,389 $97,287 $— $564,676 $419,272 $77,301 $— $496,573 
Gross profit $206,783 $48,059 $(21,634)$233,208 $191,907 $37,618 $(19,219)$210,306 
Gross margin44.2 %49.4 %41.3 %45.8 %48.7 %42.4 %

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, share-based compensation, and restructuring charges 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
September 25, 2021September 26, 2020
Probe CardsSystemsTotalProbe CardsSystemsTotal
Market:
Foundry & Logic$104,640 $— $104,640 $108,411 $— $108,411 
DRAM39,816 — 39,816 31,379 — 31,379 
Flash10,394 — 10,394 10,983 — 10,983 
Systems— 35,114 35,114 — 27,223 27,223 
Total$154,850 $35,114 $189,964 $150,773 $27,223 $177,996 
Timing of revenue recognition:
Products transferred at a point in time$154,217 $33,564 $187,781 $150,252 $25,987 $176,239 
Products and services transferred over time633 1,550 2,183 521 1,236 1,757 
Total$154,850 $35,114 $189,964 $150,773 $27,223 $177,996 
Geographical region:
China$46,011 $5,036 $51,047 $24,851 $3,695 $28,546 
Taiwan34,100 7,474 41,574 33,351 3,584 36,935 
South Korea27,895 1,077 28,972 28,337 1,234 29,571 
United States18,530 6,938 25,468 31,596 4,732 36,328 
Asia-Pacific1
18,566 1,315 19,881 5,505 3,449 8,954 
Japan5,767 4,961 10,728 12,288 4,857 17,145 
Europe3,595 6,891 10,486 11,679 5,300 16,979 
Rest of the world386 1,422 1,808 3,166 372 3,538 
Total$154,850 $35,114 $189,964 $150,773 $27,223 $177,996 
Nine Months Ended
September 25, 2021September 26, 2020
Probe CardsSystemsTotalProbe CardsSystemsTotal
Market:
Foundry & Logic$321,776 $— $321,776 $323,503 $— $323,503 
DRAM115,802 — 115,802 75,127 — 75,127 
Flash29,811 — 29,811 20,642 — 20,642 
Systems— 97,287 97,287 — 77,301 77,301 
Total$467,389 $97,287 $564,676 $419,272 $77,301 $496,573 
Timing of revenue recognition:
Products transferred at a point in time$465,822 $89,119 $554,941 $417,529 $73,393 $490,922 
Products and services transferred over time1,567 8,168 9,735 1,743 3,908 5,651 
Total$467,389 $97,287 $564,676 $419,272 $77,301 $496,573 
Geographical region:
Taiwan$125,571 $13,467 $139,038 $93,596 $8,290 $101,886 
China107,838 17,661 125,499 107,756 13,190 120,946 
United States64,012 23,592 87,604 79,575 16,790 96,365 
South Korea81,322 2,912 84,234 56,278 2,494 58,772 
Asia-Pacific1
59,013 4,114 63,127 14,307 9,010 23,317 
Europe12,894 19,601 32,495 36,656 15,498 52,154 
Japan14,493 13,260 27,753 24,502 11,072 35,574 
Rest of the world2,246 2,680 4,926 6,602 957 7,559 
Total$467,389 $97,287 $564,676 $419,272 $77,301 $496,573 

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