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Segment Information
 9 Months Ended
Sep. 30, 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 September 30, 2021, the Company has a single operating and reportable segment.
Accounts receivable from the Company’s major customers representing 10% or more of total accounts receivable at September 30, 2021 and December 31, 2020, respectively, was as follows:
As of
Customer September 30, 2021December 31, 2020
Customer 118 %*
Customer 214 %*
Customer 3 10 %13 %
Customer 4*14 %
Customer 5*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 three and nine months ended September 30, 2021 and 2020, respectively, was as follows:
Three Months EndedNine Months Ended
 September 30,September 30,
Customer 2021202020212020 (As Restated)
Customer A23 %12 %21 %13 %
Customer B15 %*10 %*
Customer C11 %18 %11 %16 %
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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:
Three Months EndedNine Months Ended
 September 30,September 30,
(In thousands)2021202020212020 (As Restated)
USA$55,337 $29,068 $147,029 $95,870 
Taiwan4,170 8,234 22,031 19,050 
South Korea1,350 719 3,947 3,240 
Japan3,095 4,175 11,509 16,749 
Europe661 728 2,294 6,410 
Canada19 534 111 1,077 
Singapore8,214 6,754 28,882 23,186 
Asia-Other8,436 6,703 20,720 18,827 
Total$81,282 $56,915 $236,523 $184,409