CONCENTRATION OF RISK (Tables)

6 Months Ended

Jun. 30, 2022

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 June 30,		% of Total Revenue for the  Six Months Ended June 30,		Accounts Receivable as of
Customer	2022	2021	2022	2021	June 30, 2022
A	39%	51%	39%	43%	$	10,467
B	30%	26%	29%	24%	$	37,895
C	14%	15%	15%	18%	$	4,892

Revenues by Geographic Area

Revenues from outside of North America represented approximately 97% for both three-month and six-month periods ended June 30, 2022 and 2021. Revenues by geographic area are as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
Country	2022		2021		2022		2021
South Korea	$	79,096	$	86,324	$	168,783	$	154,299
China		51,180		36,308		106,580		96,812
Japan		1,392		2,001		2,445		3,316
Other non-U.S. locations		715		895		1,015		1,720
Total non-U.S. locations		132,383		125,528		278,823		256,147
United States		4,178		4,132		8,208		7,513
Total revenue	$	136,561	$	129,660	$	287,031	$	263,660

Long-Lived Assets (Net) by Geographic Area

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

	June 30, 2022		December 31, 2021
United States	$	117,017	$	115,004
Other		21,011		13,828
Total long-lived assets	$	138,028	$	128,832