Segment, Geographic, Product and Significant Customer Information

The Company has one operating segment, which is the sale, design, manufacture, marketing and support of optical critical dimension and thin film systems. The following tables summarize total net revenues and long-lived assets (excluding intangible assets) attributed to significant countries (in thousands):



	Three Months Ended
	March 28, 2015		March 29, 2014
Total net revenues:
United States	$	9,078	6,741
South Korea	14,643		15,889
China	4,001		15,488
Taiwan	14,428		4,416
Other	8,226		9,042
Total net revenues	$	50,376	$	51,576



Long-lived tangible assets:	March 28, 2015		December 27, 2014
United States	$	46,011	$	47,729
Japan	65		71
South Korea	249		284
All Other	1,475		1,549
Total long-lived tangible assets	$	47,800	$	49,633

The following customers accounted for 10% or more of total accounts receivable, net:



	At
	March 28, 2015		December 27, 2014
Samsung Electronics Co. Ltd.	17.3	%	10.0	%
Taiwan Semiconductor Manufacturing Company Limited	27.8	%	20.2	%
SK Hynix	17.5	%	***
Micron	***		23.7	%
GLOBALFOUNDRIES	***		10.2	%

*** The customer accounted for less than 10% of total accounts receivable, net, as of that period end.

The following customers accounted for 10% or more of total net revenues:




	March 28, 2015		March 29, 2014
Samsung Electronics Co. Ltd.	30.3	%	51.7	%
Intel Corporation	***		13.1	%
SK Hynix	13.4	%	***
Taiwan Semiconductor Manufacturing Company Limited	22.3	%	***

*** The customer accounted for less than 10% of total net revenues during the period.