CONCENTRATION OF RISK (Tables)

Revenues and accounts receivable from the Company's largest customers were as follows (in thousands):

	% of Revenues for the three months ended September 30,		% of Revenues for the nine months ended September 30,		Accounts Receivable as of
Customer	2018	2017	2018	2017	September 30, 2018
A	50%	43%	36%	59%	$	11,788
B	19%	31%	35%	25%	$	10,869
C	10%	3%	9%	2%	$	3,372
D	9%	14%	8%	7%	$	11,758

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

	Three Months Ended September 30,				Nine Months Ended September 30,
Country	2018		2017		2018		2017
South Korea	$	53,883	$	45,803	$	126,789	$	185,937
China		17,037		10,234		34,368		18,130
Japan		3,076		2,462		4,637		5,590
Other non-U.S. locations		457		597		2,078		2,132
Total non-U.S. locations	$	74,453	$	59,096	$	167,872	$	211,789
United States		3,097		2,587		9,399		7,973
Total revenue	$	77,550	$	61,683	$	177,271	$	219,762

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