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	2017		2016		2017		2016		September 30, 2017
A		43%		36%		59%		57%	$	20,616
B		31%		45%		25%		33%	$	11,960
C		14%		7%		7%		5%	$	4,991

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

	Three Months Ended September 30,				Nine Months Ended September 30,
Country	2017		2016		2017		2016
South Korea	$	45,803	$	24,852	$	185,937	$	111,994
China		10,234		2,095		18,130		5,663
Japan		2,462		1,230		5,590		3,334
Other non-U.S. locations		597		396		2,132		1,416
Total non-U.S. locations	$	59,096	$	28,573	$	211,789	$	122,407
United States		2,587		1,641		7,973		1,902
Total revenue	$	61,683	$	30,214	$	219,762	$	124,309

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