CONCENTRATION OF RISK (Tables)

6 Months Ended

Jun. 30, 2019

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 Revenues for the Three months ended June 30,		% of Revenues for the Six Months Ended June 30,		Accounts Receivable as of
Customer	2019	2018	2019	2018	June 30, 2019
A	39%	33%	39%	26%	$	15,041
B	24%	9%	19%	9%	$	17,088
C	23%	42%	26%	48%	$	16,701

Revenues by Geographic Area

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

	Three Months Ended June 30,				Six Months Ended June 30,
Country	2019		2018		2019		2018
South Korea	$	58,762	$	42,132	$	120,261	$	72,906
China		54,972		8,479		75,750		17,331
Japan		818		686		2,665		1,561
Other non-U.S. locations		597		1,061		1,179		1,622
Total non-U.S. locations	$	115,149	$	52,358	$	199,855	$	93,420
United States		3,019		3,791		6,078		6,301
Total revenue	$	118,168	$	56,149	$	205,933	$	99,721

Long-Lived Assets (Net) by Geographic Area

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

	June 30, 2019		December 31, 2018
United States	$	78,115	$	64,560
Other		5,480		5,179
Total long-lived assets	$	83,595	$	69,739