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Segment Information
 12 Months Ended
Dec. 31, 2021
Segment Reporting [Abstract]  
Segment Information Segments and Major Customers
Operating segments are based upon Rambus’ internal organization structure, the manner in which its operations are managed, the criteria used by its Chief Operating Decision Maker (“CODM”) to evaluate segment performance and availability of separate financial information regularly reviewed for resource allocation and performance assessment.
The Company has determined its CODM to be the Chief Executive Officer (“CEO”). The CEO reviews financial information presented on a consolidated basis for purposes of managing the business, allocating resources, making operating decisions and assessing financial performance. On this basis, the Company is organized and operates as a single segment within the semiconductor space. As of December 31, 2021, the Company has a single operating and reportable segment. Accordingly, no additional disclosure of segment measures of profit or loss or total assets is applicable for all periods presented.
Accounts receivable from the Company’s major customers representing 10% or more of total accounts receivable at December 31, 2021 and 2020, respectively, was as follows:
As of December 31,
Customer20212020
Customer 119 %13 %
Customer 217 %*
Customer 3*14 %
Customer 4*11 %
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*    Customer accounted for less than 10% of total accounts receivable in the period.
Revenue from the Company’s major customers representing 10% or more of total revenue for the years ended December 31, 2021, 2020 and 2019, respectively, was as follows:
Years Ended December 31,
Customer202120202019
Customer A21 %12 %*
Customer B13 %**
Customer C11 %15 %10 %
Customer D**14 %
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*    Customer accounted for less than 10% of total revenue in the period.
Revenue from customers in the geographic regions based on the location of contracting parties was as follows:
Years Ended December 31,
(In thousands)202120202019
USA$211,419 $137,614 $134,526 
Singapore39,798 28,034 21,751 
Asia-Other28,949 26,249 14,356 
Taiwan23,953 21,803 24,118 
Japan14,894 20,437 15,453 
South Korea6,007 3,664 3,583 
Europe3,165 7,359 10,262 
Canada119 1,162 3,554 
Total$328,304 $246,322 $227,603 
At December 31, 2021, of the $56.0 million of total property, plant and equipment, approximately $49.8 million were located in the United States, $3.2 million were located in India and $3.0 million were located in other foreign locations. At December 31, 2020, of the $57.7 million of total property, plant and equipment, approximately $53.2 million were located in the United States, $3.3 million were located in India and $1.2 million were located in other foreign locations.