Segment, Geographic, Product and Significant Customer Information

3 Months Ended

Mar. 30, 2019

Segment Reporting [Abstract]

Segment, Geographic, Product and Significant Customer Information

Note 15. 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 30, 2019		March 31, 2018
Total net revenues:
United States	$	16,874	$	6,738
China		14,361		8,042
South Korea		13,968		37,818
Taiwan		11,288		1,060
Japan		4,318		13,379
Singapore		1,551		12,155
Other		4,740		3,121
Total net revenues	$	67,100	$	82,313

	March 30, 2019		December 29, 2018
Long-lived tangible assets:
United States	$	48,986	$	46,325
International		1,546		1,575
Total long-lived tangible assets	$	50,532	$	47,900

With respect to customer concentration, SK hynix, Intel and Taiwan Semiconductor each accounted for more than 10% of total sales for the three months ended March 30, 2019, and Samsung Electronics Co. Ltd., SK hynix, Micron Technology, Inc., and Toshiba Memory Corporation each accounted for more than 10% of total sales for the three months ended March 31, 2018.

With respect to accounts receivable concentration, Taiwan Semiconductor and SK hynix each accounted for more than 10% of total accounts receivable as of March 30, 2019. SK hynix and Toshiba Memory Corporation each accounted for more than 10% of total accounts receivable as of December 29, 2018.