CONCENTRATION OF RISK

9 Months Ended

Sep. 30, 2017

15.	CONCENTRATION OF RISK:

Included in contract services revenue in the accompanying statement of operations is zero and $32,000 for the three months ended September 30, 2017 and 2016, respectively, and $10,000 and $148,000 for the nine months ended September 30, 2017 and 2016, respectively, which was derived from contracts with United States government agencies. Revenues derived from contracts with United States government agencies represented less than 1% of the consolidated revenue for all periods presented.

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 from outside of North America represented approximately 96% and 95% of consolidated revenue for the three months ended September 30, 2017 and 2016, respectively, and 96% and 98% of consolidated revenue for the nine months ended September 30, 2017 and 2016, respectively. 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

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

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

	September 30, 2017		December 31, 2016
United States	$	47,695	$	26,917
Other		1,663		286
Total long-lived assets	$	49,358	$	27,203

Substantially all chemical materials were purchased from one supplier. See Note 9.