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CONCENTRATION OF RISK (Tables)

9 Months Ended

Sep. 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 September 30,						% of Total Revenue for the Nine Months Ended September 30,						Accounts Receivable as of
Customer		2020			2019			2020			2019			September 30, 2020
A		41%			56%			38%			45%			$	22,138
B		28%			21%			28%			24%			$	15,308
C		14%			12%			17%			17%			$	33,266

Revenues by Geographic Area

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

		Three Months Ended September 30,								Nine Months Ended September 30,
Country		2020				2019				2020				2019
South Korea		$	66,667			$	70,042			$	167,154			$	190,303
China			43,569				23,205				101,911				98,955
Japan			2,279				1,137				6,263				3,802
Other non-U.S. locations			663				539				1,475				1,718
Total non-U.S. locations			113,178				94,923				276,803				294,778
United States			3,901				2,592				10,521				8,670
Total revenue		$	117,079			$	97,515			$	287,324			$	303,448

Long-Lived Assets (Net) by Geographic Area

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

		September 30, 2020				December 31, 2019
United States		$	88,476			$	80,027
Other			8,354				7,845
Total long-lived assets		$	96,830			$	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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