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Segment Information (Tables) | 6 Months Ended
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Jun. 30, 2020
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) |  | 2020 |  | 2019 |  | 2020 |  | 2019
USA |  | $ | 32,014 |  |  | $ | 29,964 |  |  | $ | 66,802 |  |  | $ | 64,203 |
Taiwan |  | 3,752 |  |  | 12,760 |  |  | 10,816 |  |  | 14,861 |
South Korea |  | 701 |  |  | 758 |  |  | 2,521 |  |  | 2,039 |
Japan |  | 6,156 |  |  | 2,527 |  |  | 8,999 |  |  | 5,146 |
Europe |  | 4,944 |  |  | 2,640 |  |  | 5,682 |  |  | 6,015 |
Canada |  | 31 |  |  | 1,423 |  |  | 543 |  |  | 2,481 |
Singapore |  | 8,802 |  |  | 4,725 |  |  | 16,432 |  |  | 6,609 |
Asia-Other |  | 3,530 |  |  | 3,500 |  |  | 12,124 |  |  | 5,327 |
Total |  | $ | 59,930 |  |  | $ | 58,297 |  |  | $ | 123,919 |  |  | $ | 106,681 |
Accounts receivable |
Concentration Risk |
Schedule of customer accounts representing 10% or more than 10% of total revenue | Accounts receivable from the Company’s major customers representing 10% or more of total accounts receivable at June 30, 2020 and December 31, 2019, respectively, was as follows:
|  | As of |  |
Customer |  | June 30, 2020 |  | December 31, 2019
Customer 1 |  | 18 | % |  | 14 | %
Customer 2 |  | * |  | 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 | Revenue from the Company’s major customers representing 10% or more of total revenue for the three and six months ended June 30, 2020 and 2019, respectively, was as follows:
|  | Three Months Ended |  |  |  | Six Months Ended |  |
|  | June 30, |  |  |  | June 30, |  |
Customer |  | 2020 |  | 2019 |  | 2020 |  | 2019
Customer A |  | 18 | % |  | 11 | % |  | 16 | % |  | 11 | %
Customer B |  | 15 | % |  | * |  | 14 | % |  | *
Customer C |  | * |  | 15 | % |  | * |  | *
Customer D |  | * |  | 14 | % |  | * |  | 15 | %
_________________________________________ * Customer accounted for less than 10% of total revenue in the period

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