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CONCENTRATION OF RISK (Tables)

3 Months Ended

Mar. 31, 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 March 31,						Accounts Receivable as of
Customer		2020			2019			March 31, 2020
A		41%			40%			$	20,663
B		25%			30%			$	10,870
C		23%			13%			$	33,421

Revenues by Geographic Area

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

		Three Months Ended March 31,
Country		2020				2019
South Korea		$	69,425			$	61,499
China			37,834				20,778
Japan			1,787				1,846
Other non-U.S. locations			497				583
Total non-U.S. locations			109,543				84,706
United States			2,734				3,059
Total revenue		$	112,277			$	87,765

Long-Lived Assets (Net) by Geographic Area

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

		March 31, 2020				December 31, 2019
United States		$	79,969			$	80,027
Other			8,381				7,845
Total long-lived assets		$	88,350			$	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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