Note 16. 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 31, 2016, December 26, 2015, and December 27, 2014, 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 31, 2016		December 26, 2015		December 27, 2014
Total net revenues^(1):
South Korea	$	44,735	$	30,572	$	41,381
China		43,460		17,373		28,702
Singapore		37,096		17,395		7,905
United States		29,887		36,720		36,123
Taiwan		27,189		46,715		19,790
Japan		26,604		31,140		15,185
Other		12,158		7,452		17,357
Total net revenues	$	221,129	$	187,367	$	166,443

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

	December 31, 2016		December 26, 2015
Long-lived tangible assets:
United States	$	42,688	$	42,581
Taiwan		818		1,056
South Korea		554		697
Japan		57		59
All Other		109		100
Total long-lived tangible assets	$	44,226	$	44,493

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 31, 2016		December 26, 2015		December 27, 2014
Automated Systems	$	127,378	$	102,386	$	108,768
Integrated Systems		43,846		31,579		15,334
Materials Characterization Systems		13,842		12,980		9,487
Total product revenues	$	185,066	$	146,945	$	133,589

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

	Years Ended
	December 31, 2016			December 26, 2015			December 27, 2014
Taiwan Semiconductor Manufacturing Company Limited		20.1	%		25.6	%		20.2	%
Samsung Electronics Co. Ltd.		14.3	%	***				10.0	%
Micron Technology, Inc.		11.8	%	***				23.7	%
Intel Corporation		11.1	%	***			***
Toshiba Corporation		10.2	%		27.1	%	***
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 31, 2016			December 26, 2015			December 27, 2014
Micron Technology, Inc.		20.3	%		15.8	%		10.4	%
Intel Corporation		18.0	%	***				12.6	%
SK Hynix		15.3	%		10.7	%		12.2	%
Taiwan Semiconductor Manufacturing Company Limited		10.0	%		19.4	%	***
Samsung Electronics Co. Ltd.	***				13.2	%		26.9	%
Toshiba Corporation	***				10.2	%	***

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