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CONCENTRATION OF RISK (Tables)

12 Months Ended

Dec. 31, 2021

Risks and Uncertainties [Abstract]

Revenues and Accounts Receivable From Our Largest Customers

Revenues and accounts receivable from the Company's largest customers for the years ended December 31, 2021, 2020 and 2019 were as follows (in thousands):

		2021						2020						2019
Customer		% of Total Revenue		Accounts Receivable				% of Total Revenue		Accounts Receivable				% of Total Revenue		Accounts Receivable
A		44%		$	10,850			41%		$	20,476			44%		$	13,830
B		26%			45,867			30%			26,776			27%			19,346
C		14%			18,557			13%			2,757			15%			10,592

Revenues by Geographic Area

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

		Year Ended December 31,
Country		2021				2020				2019
South Korea		$	334,835			$	263,079			$	250,562
China			192,079				142,076				135,259
Japan			7,358				7,405				5,276
Other non-U.S. locations			3,137				1,728				2,270
Total non-U.S. locations			537,409				414,288				393,367
United States			16,116				14,579				11,810
Total revenue		$	553,525			$	428,867			$	405,177

Long-Lived Assets (Net) by Geographic Area

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

		2021				2020
United States		$	115,004			$	93,230
Other			13,828				8,883
Total long-lived assets		$	128,832			$	102,113

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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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