CONCENTRATION OF RISK (Tables)

12 Months Ended

Dec. 31, 2022

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, 2022, 2021 and 2020 were as follows (in thousands):

	2022			2021			2020
Customer	% of Total Revenue	Accounts Receivable		% of Total Revenue	Accounts Receivable		% of Total Revenue	Accounts Receivable
A	41%	$	11,425	44%	$	10,850	41%	$	20,476
B	25%		24,440	26%		45,867	30%		26,776
C	16%		22,291	14%		18,557	13%		2,757

Revenues by Geographic Area

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

	Year Ended December 31,
Country	2022		2021		2020
South Korea	$	360,640	$	334,835	$	263,079
China		230,582		192,079		142,076
Japan		5,579		7,358		7,405
Other non-U.S. locations		3,829		3,137		1,728
Total non-U.S. locations		600,630		537,409		414,288
United States		15,989		16,116		14,579
Total revenue	$	616,619	$	553,525	$	428,867

Long-Lived Assets (Net) by Geographic Area

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

	December 31,
Country	2022		2021
United States	$	117,255	$	115,004
Ireland		20,270		7,000
Other		5,920		6,828
Total long-lived assets	$	143,445	$	128,832