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CONCENTRATION OF RISK (Tables)

6 Months Ended

Jun. 30, 2020

Risks And Uncertainties [Abstract]

Revenues and Accounts Receivable From Our Largest Customers

Revenues and accounts receivable from the Company's largest customers were as follows (in thousands):

		% of Total Revenue for the Three Months Ended June 30,						% of Total Revenue for the Six Months Ended June 30,						Accounts Receivable as of
Customer		2020			2019			2020			2019			June 30, 2020
A		34%			23%			28%			26%			$	19,609
B		28%			39%			36%			39%			$	6,836
C		13%			24%			19%			19%			$	26,182
D		10%			9%			8%			8%			$	4,625

Revenues by Geographic Area

Revenues by geographic area are as follows (in thousands):

		Three Months Ended June 30,								Six Months Ended June 30,
Country		2020				2019				2020				2019
South Korea		$	31,062			$	58,762			$	100,487			$	120,261
China			20,508				54,972				58,342				75,750
Japan			2,197				818				3,984				2,665
Other non-U.S. locations			315				597				812				1,179
Total non-U.S. locations			54,082				115,149				163,625				199,855
United States			3,886				3,019				6,620				6,078
Total revenue		$	57,968			$	118,168			$	170,245			$	205,933

Long-Lived Assets (Net) by Geographic Area

Long-lived assets (net), by geographic area are as follows (in thousands):

		June 30, 2020				December 31, 2019
United States		$	83,659			$	80,027
Other			8,344				7,845
Total long-lived assets		$	92,003			$	87,872

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Tabular disclosure of the names of foreign countries from which revenue is material and the amount of revenue from external customers attributed to those countries. An entity may also provide subtotals of geographic information about groups of countries.

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