CONCENTRATION OF RISK

12 Months Ended

Dec. 31, 2016

17.	CONCENTRATION OF RISK:

Included in technology development and support revenue in the accompanying consolidated statements of income is $156,000, $185,000, and $118,000 for the years ended December 31, 2016, 2015, and 2014, respectively, of revenue which was derived from contracts with United States government agencies. Revenues derived from contracts with United States government agencies represented approximately less than 1% of the consolidated revenue for the years ended December 31, 2016, 2015, and 2014, respectively.

Revenues and accounts receivable from the Company's largest customers for the years ended December 31 were as follows (in thousands):

	2016				2015				2014
Customer	% of Total Revenue		Accounts Receivable		% of Total Revenue		Accounts Receivable		% of Total Revenue		Accounts Receivable
A		63%	$	12,050		62%	$	13,355		54%	$	8,550
B		28%		9,128		25%		8,477		19%		7,598
C		4%		1,427		1%		1,564		1%		540

Revenues from outside of North America represented approximately 98%, 99%, and 99% of the consolidated revenue for the years ended December 31, 2016, 2015, and 2014, respectively. Revenues by geographic area are as follows (in thousands):

	Year Ended December 31,
Country	2016		2015		2014
South Korea	$	181,771	$	168,267	$	141,922
China		7,180		2,685		1,260
Japan		4,310		16,542		44,903
Other non-U.S. locations		1,849		2,334		2,240
Total non-U.S. locations	$	195,110	$	189,828	$	190,325
United States		3,776		1,218		706
Total revenue	$	198,886	$	191,046	$	191,031

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):

	2016		2015
United States	$	26,917	$	22,187
Other		286		220
Total long-lived assets	$	27,203	$	22,407

Substantially all chemical materials were purchased from one supplier. See Note 11.