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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2021
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 |  | Six Months Ended
|  | June 30, |  | June 30,
(In thousands) |  | 2021 |  | 2020 (As Restated) |  | 2021 |  | 2020 (As Restated)
USA |  | $ | 45,541 |  |  | $ | 32,014 |  |  | $ | 91,692 |  |  | $ | 66,802 |
Taiwan |  | 9,018 |  |  | 3,752 |  |  | 17,861 |  |  | 10,816 |
South Korea |  | 2,209 |  |  | 701 |  |  | 2,597 |  |  | 2,521 |
Japan |  | 3,826 |  |  | 7,943 |  |  | 8,414 |  |  | 12,574 |
Europe |  | 1,187 |  |  | 4,944 |  |  | 1,633 |  |  | 5,682 |
Canada |  | 38 |  |  | 31 |  |  | 92 |  |  | 543 |
Singapore |  | 14,330 |  |  | 8,802 |  |  | 20,668 |  |  | 16,432 |
Asia-Other |  | 8,710 |  |  | 3,530 |  |  | 12,284 |  |  | 12,124 |
Total |  | $ | 84,859 |  |  | $ | 61,717 |  |  | $ | 155,241 |  |  | $ | 127,494 |
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 June 30, 2021 and December 31, 2020, respectively, was as follows:
|  | As of
Customer |  | June 30, 2021 |  | December 31, 2020
Customer 1 |  | 13 | % |  | 13 | %
Customer 2 |  | 11 | % |  | *
Customer 3 |  | 10 | % |  | 14 | %
Customer 4 |  | * |  | 11 | %
_________________________________________ * 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 and six months ended June 30, 2021 and 2020, respectively, was as follows:
|  | Three Months Ended |  | Six Months Ended
|  | June 30, |  | June 30,
Customer |  | 2021 |  | 2020 (As Restated) |  | 2021 |  | 2020 (As Restated)
Customer A |  | 16 | % |  | 15 | % |  | 19 | % |  | 13 | %
Customer B |  | * |  | 18 | % |  | 11 | % |  | 16 | %
Customer C |  | 13 | % |  | * |  | * |  | *
_________________________________________ * Customer accounted for less than 10% of total revenue in the period.

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