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Segment Information (Tables) | 3 Months Ended
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Mar. 31, 2022
Concentration risk |
Revenue from external customer by geographic regions | Revenue from customers in the geographic regions based on the location of contracting parties was as follows:
|  | Three Months Ended |  |
|  | March 31, |  |
(In thousands) |  | 2022 |  | 2021 |  |  |  |
USA |  | $ | 55,684 |  |  | $ | 46,151 |  |  |  |  |
Asia-Other |  | 17,792 |  |  | 3,574 |  |  |  |  |
Singapore |  | 14,045 |  |  | 6,338 |  |  |  |  |
Taiwan |  | 4,960 |  |  | 8,843 |  |  |  |  |
Japan |  | 3,535 |  |  | 4,588 |  |  |  |  |
Europe |  | 1,564 |  |  | 446 |  |  |  |  |
South Korea |  | 1,465 |  |  | 388 |  |  |  |  |
Canada |  | 5 |  |  | 54 |  |  |  |  |
Total |  | $ | 99,050 |  |  | $ | 70,382 |  |  |  |  |
Accounts receivable |
Concentration risk |
Schedule of customer accounts representing 10% or more than 10% of total | Accounts receivable from the Company’s major customers representing 10% or more of total accounts receivable at March 31, 2022 and December 31, 2021, respectively, was as follows:
|  | As of
Customer |  | March 31, 2022 |  | December 31, 2021
Customer 1 |  | 18 | % |  | *
Customer 2 |  | 17 | % |  | 17 | %
Customer 3 |  | 14 | % |  | 19 | %
_________________________________________ * Customer accounted for less than 10% of total accounts receivable in the period.
Revenue |
Concentration risk |
Schedule of customer accounts representing 10% or more than 10% of total | Revenue from the Company’s major customers representing 10% or more of total revenue for the three months ended March 31, 2022 and 2021, respectively, was as follows:
|  | Three Months Ended |  |
|  | March 31, |  |
Customer |  | 2022 |  | 2021 |  |  |  |
Customer A |  | 25 | % |  | 23 | % |  |  |  |
Customer B |  | 14 | % |  | * |  |  |  |
Customer C |  | * |  | 14 | % |  |  |  |
_________________________________________ * Customer accounted for less than 10% of total revenue in the period.

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