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CONCENTRATION OF RISK (Tables)

3 Months Ended

Mar. 31, 2021

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		2021			2020			March 31, 2021
A		36%			41%			$	6,204
B		23%			25%			$	20,769
C		20%			23%			$	22,802
D		12%			7%			$	17,740

Revenues by Geographic Area

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

		Three Months Ended March 31,
Country		2021				2020
South Korea		$	67,975			$	69,425
China			60,504				37,834
Japan			1,315				1,787
Other non-U.S. locations			825				497
Total non-U.S. locations			130,619				109,543
United States			3,381				2,734
Total revenue		$	134,000			$	112,277

Long-Lived Assets (Net) by Geographic Area

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

		March 31, 2021				December 31, 2020
United States		$	99,678			$	93,230
Other			8,137				8,883
Total long-lived assets		$	107,815			$	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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