Segment, Geographic, Product and Significant Customer Information

The Company has one operating segment, which is the sale, design, manufacture, marketing and support of thin film and optical critical dimension systems. The Chief Executive Officer has been identified as the Chief Operating Decision Maker (“CODM”) because he has the final authority over resource allocation decisions and performance assessment. The CODM does not receive discrete financial information about individual components of the Company's business. For the years ended December 27, 2014, December 28, 2013, and December 29, 2012, the Company recorded revenue from customers primarily in the United States, Asia and Europe. The following tables summarize total net revenues and long-lived assets (excluding intangible assets) attributed to significant countries (in thousands):



	Years Ended
	December 27, 2014		December 28, 2013		December 29, 2012
Total net revenues ⁽¹⁾:
United States	$	36,123	47,019		44,811
South Korea	41,381		34,873		79,555
China	28,702		13,063		5,323
Taiwan	19,790		9,645		16,757
Other	40,447		39,707		36,435
Total net revenues	$	166,443	$	144,307	$	182,881

⁽¹⁾ Net revenues are attributed to countries based on the customer's deployment and service locations of systems.



Long-lived tangible assets:	December 27, 2014		December 28, 2013
United States	$	47,729	$	44,775
Japan	71		125
South Korea	284		445
All Other	1,549		2,094
Total long-lived tangible assets	$	49,633	$	47,439

The Company’s product lines differ primarily based on the environment in which the systems will be used. Automated systems are used primarily in high-volume production environments. Materials characterization products are primarily used to measure the composition, band gap, structure, and other physical and electrical properties of semiconducting materials for discrete electronic industry, high brightness LED and solar/photovoltaic structures in both development and high volume environments. Integrated systems are installed inside wafer processing equipment to provide near real-time measurements for improving process control and increasing throughput. Revenues by product type were as follows (in thousands):



	Years Ended
	December 27, 2014		December 28, 2013		December 29, 2012
Automated Systems	$	108,768	$	82,924	$	119,451
Integrated Systems	15,334		11,412		12,379
Materials Characterization Systems	9,487		13,066		11,997
Total product revenues	$	133,589	$	107,402	$	143,827

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



	At
	December 27, 2014		December 28, 2013		December 29, 2012
Samsung Electronics Co. Ltd.	10.0	%	27.4	%	***
Intel Corporation	***		14.4	%	12.3	%
Taiwan Semiconductor Manufacturing Company Limited	20.2	%	12.1	%	17.3	%
SK Hynix	***		21.8	%	***
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 revenue:



	Years Ended
	December 27, 2014		December 28, 2013		December 29, 2012
Samsung Electronics Co. Ltd.	26.9	%	14.4	%	27.8	%
Intel Corporation	12.6	%	30.0	%	22.3	%
SK Hynix	12.2	%	18.4	%	16.5	%
Micron	10.4	%	***		***

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