CONCENTRATION OF RISK

12 Months Ended

Dec. 31, 2023

19.

CONCENTRATION OF RISK:

Revenues and accounts receivable from the Company's largest customers for the years ended December 31, 2023, 2022 and 2021 were as follows (in thousands):


	2023			2022			2021
Customer	% of Total Revenue	Accounts Receivable		% of Total Revenue	Accounts Receivable		% of Total Revenue	Accounts Receivable
A	36%	$	38,105	41%	$	11,425	44%	$	10,850
B	23%		30,142	25%		24,440	26%		45,867
C	17%		38,529	16%		22,291	14%		18,557

Revenues from outside of North America represented approximately 98%, 97%, and 97% of consolidated revenue for each of the years ended December 31, 2023, 2022 and 2021, respectively. Revenues by geographic area are as follows (in thousands):


	Year Ended December 31,
Country	2023		2022		2021
South Korea	$	322,509	$	360,640	$	334,835
China		229,727		230,582		192,079
Japan		6,971		5,579		7,358
Other non-U.S. locations		4,411		3,829		3,137
Total non-U.S. locations		563,618		600,630		537,409
United States		12,811		15,989		16,116
Total revenue	$	576,429	$	616,619	$	553,525

The Company attributes revenue to different geographic areas on the basis of the location of the customer.

Property and equipment, net by geographic area are as follows (in thousands):


	December 31,
Country	2023		2022
United States	$	118,250	$	117,255
Ireland		42,203		20,270
Other		14,697		5,920
Total long-lived assets	$	175,150	$	143,445

Substantially all chemical materials were purchased from one supplier. See Note 13.