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				Nine Months Ended
	September 26, 2015		September 27, 2014		September 26, 2015		September 27, 2014
Total net revenues:
United States	$	7,985	5,511		$	32,115	25,554
South Korea	6,794		6,327		28,807		30,589
Taiwan	11,331		640		35,173		11,337
China	6,731		2,848		12,357		27,694
Japan	7,778		4,099		15,919		10,005
Other	5,059		7,708		20,311		21,559
Total net revenues	$	45,678	$	27,133	$	144,682	$	126,738



Long-lived tangible assets:	September 26, 2015		December 27, 2014
United States	$	44,410	$	47,729
Taiwan	1,146		1,473
All Other	388		431
Total long-lived tangible assets	$	45,944	$	49,633

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



	At
	September 26, 2015		December 27, 2014
Micron	***		24	%
Taiwan Semiconductor Manufacturing Company Limited	28	%	20	%
SK Hynix	15	%	***
Samsung Electronics Co. Ltd.	***		10	%
Global Foundries	***		10	%
Toshiba	13	%	***

*** 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:



	Three Months Ended				Nine Months Ended
	September 26, 2015		September 27, 2014		September 26, 2015		September 27, 2014
Micron	14	%	25	%	18	%	***
Taiwan Semiconductor Manufacturing Company Limited	17	%	***		19	%	***
SK Hynix	15	%	27	%	13	%	16	%
Samsung Electronics Co. Ltd.	***		***		16	%	28	%
Toshiba	13	%	***		***		***
Intel Corporation	***		***		***		14	%

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