Segments and Major Customers (Tables)

12 Months Ended

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	%

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*    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	%