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Segment Information (Tables)
 12 Months Ended
Dec. 31, 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:
Years Ended December 31,
(In thousands)202120202019
USA$211,419 $137,614 $134,526 
Singapore39,798 28,034 21,751 
Asia-Other28,949 26,249 14,356 
Taiwan23,953 21,803 24,118 
Japan14,894 20,437 15,453 
South Korea6,007 3,664 3,583 
Europe3,165 7,359 10,262 
Canada119 1,162 3,554 
Total$328,304 $246,322 $227,603 
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, 2021 and 2020, respectively, was as follows:
As of December 31,
Customer20212020
Customer 119 %13 %
Customer 217 %*
Customer 3*14 %
Customer 4*11 %
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*    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 balance
Revenue from the Company’s major customers representing 10% or more of total revenue for the years ended December 31, 2021, 2020 and 2019, respectively, was as follows:
Years Ended December 31,
Customer202120202019
Customer A21 %12 %*
Customer B13 %**
Customer C11 %15 %10 %
Customer D**14 %
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*    Customer accounted for less than 10% of total revenue in the period.