CONCENTRATION OF RISK

6 Months Ended

Jun. 30, 2017

15.	CONCENTRATION OF RISK:

Included in contract services revenue in the accompanying statement of operations is none and $59,000 for the three months ended June 30, 2017 and 2016, respectively, and $10,000 and $116,000 for the six months ended June 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 June 30,				% of Revenues for the six months ended June 30,				Accounts Receivable as of
Customer	2017		2016		2017		2016		June 30, 2017
A		73%		76%		66%		64%	$	20,210
B		17%		18%		23%		29%	$	10,587
C		5%		3%		4%		4%	$	3,561

Revenues from outside of North America represented approximately 98% and 99% of consolidated revenue for the three months ended June 30, 2017 and 2016, respectively, and 97% and 99% of consolidated revenue for the six months ended June 30, 2017 and 2016, respectively. Revenues by geographic area are as follows (in thousands):

	Three Months Ended June 30,				Six Months Ended June 30,
Country	2017		2016		2017		2016
South Korea	$	92,206	$	61,196	$	140,134	$	87,142
China		5,414		1,812		7,896		3,569
Japan		2,044		800		3,128		2,104
Other non-U.S. locations		822		405		1,534		1,018
Total non-U.S. locations	$	100,486	$	64,213	$	152,692	$	93,833
United States		2,027		179		5,387		262
Total revenue	$	102,513	$	64,392	$	158,079	$	94,095

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):

	June 30, 2017		December 31, 2016
United States	$	38,587	$	26,917
Other		104		286
Total long-lived assets	$	38,691	$	27,203

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