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Segments and Major Customers (Tables) | 12 Months Ended
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Dec. 31, 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:
|  | Years Ended December 31,
(In thousands) |  | 2020 |  | 2019 |  | 2018
USA |  | $ | 137,614 |  |  | $ | 134,526 |  |  | $ | 129,567 |
Taiwan |  | 21,803 |  |  | 24,118 |  |  | 21,749 |
South Korea |  | 3,664 |  |  | 3,583 |  |  | 13,421 |
Japan |  | 16,862 |  |  | 11,877 |  |  | 23,222 |
Europe |  | 7,359 |  |  | 10,262 |  |  | 15,668 |
Canada |  | 1,162 |  |  | 3,554 |  |  | 4,960 |
Singapore |  | 28,034 |  |  | 21,751 |  |  | 19,140 |
Asia-Other |  | 26,249 |  |  | 14,356 |  |  | 3,474 |
Total |  | $ | 242,747 |  |  | $ | 224,027 |  |  | $ | 231,201 |
Accounts receivable |
Concentration Risk |
Schedule of customer accounts representing 10% or more than 10% of total balance | Accounts receivable from the Company’s major customers representing 10% or more of total accounts receivable at December 31, 2020 and 2019, respectively, was as follows:
|  | As of December 31,
|  | 2020 |  | 2019
Customer 1 |  | 14 | % |  | *
Customer 2 |  | 13 | % |  | 14 | %
Customer 3 |  | 11 | % |  | *
Customer 4 |  | * |  | 19 | %
_________________________________________ * Customer accounted for less than 10% of total accounts receivable in the period
Sales, net |
Concentration Risk |
Schedule of customer accounts representing 10% or more than 10% of total balance | Revenue from the Company’s major customers representing 10% or more of total revenue for the years ended December 31, 2020, 2019 and 2018 was as follows:
|  | Years Ended December 31,
|  | 2020 |  | 2019 |  | 2018
Customer A |  | 15 | % |  | 10 | % |  | *
Customer B |  | 13 | % |  | * |  | *
Customer C |  | * |  | 14 | % |  | 15 | %
Customer D |  | * |  | * |  | 11 | %

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