Segment, Geographic, Product and Significant Customer Information (Tables)

12 Months Ended

Dec. 26, 2015

Segment Reporting [Abstract]

Total net revenue

The following tables summarize total net revenues and long-lived assets (excluding intangible assets) attributed to significant countries (in thousands):

	Years Ended
	December 26, 2015		December 27, 2014		December 28, 2013
Total net revenues (1):
United States	$	36,720	$	36,123	$	47,019
China		17,373		28,702		13,063
Japan		31,140		15,185		11,629
South Korea		30,572		41,381		34,873
Taiwan		46,715		19,790		9,645
Other		24,847		25,262		28,078
Total net revenues	$	187,367	$	166,443	$	144,307

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

Long-lived tangible assets

	December 26, 2015		December 27, 2014
Long-lived tangible assets:
United States	$	42,581	$	47,729
Japan		59		71
South Korea		697		284
Taiwan		1,056		1,473
All Other		100		76
Total long-lived tangible assets	$	44,493	$	49,633

Revenues by product type

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 26, 2015		December 27, 2014		December 28, 2013
Automated Systems	$	102,386	$	108,768	$	82,924
Integrated Systems		31,579		15,334		11,412
Materials Characterization Systems		12,980		9,487		13,066
Total product revenues	$	146,945	$	133,589	$	107,402

Revenues by product type were as follows (in thousands):

Customers accounted for 10% or more of total accounts receivable

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

	Years Ended
	December 26, 2015			December 27, 2014			December 28, 2013
Toshiba Corporation		27.1	%	***			***
Taiwan Semiconductor Manufacturing Company Limited		25.6	%		20.2	%		12.1	%
SK Hynix	***			***				21.8	%
Samsung Electronics Co. Ltd.	***				10.0	%		27.4	%
Micron	***				23.7	%	***
Intel Corporation	***			***				14.4	%
GlobalFoundries	***				10.2	%	***

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

Customers accounted for 10% or more of total revenue

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

	Years Ended
	December 26, 2015			December 27, 2014			December 28, 2013
Taiwan Semiconductor Manufacturing Company Limited		19.4	%	***			***
Micron		15.8	%		10.4	%	***
Samsung Electronics Co. Ltd.		13.2	%		26.9	%		14.4	%
SK Hynix		10.7	%		12.2	%		18.4	%
Toshiba Corporation		10.2	%	***			***
Intel Corporation	***				12.6	%		30.0	%

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