GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION (Tables)

9 Months Ended

Sep. 27, 2015

Geographic and Customer Concentration Information [Abstract]

Summary of Net Revenue by Geographic Area

The following table summarizes net revenue by geographic areas based on the installation locations of the systems and the location of services rendered (in thousands, except percentages):

	Three Months Ended						Nine Months Ended
	September 27, 2015			September 28, 2014			September 27, 2015			September 28, 2014
	Amount		Percent	Amount		Percent	Amount		Percent	Amount		Percent
Net revenue:
United States	$	2,935	7	$	8,188	21	$	14,509	10	$	18,763	15
South Korea	6,699		17	15,613		41	67,439		48	49,735		40
China	15,893		41	853		2	24,607		18	16,202		13
Taiwan	6,855		18	10,746		28	14,894		11	27,066		22
Other Asia	4,273		11	1,718		5	14,503		10	5,588		5
Europe and others	2,239		6	1,312		3	4,530		3	6,303		5
	$	38,894	100	$	38,430	100	$	140,482	100	$	123,657	100

Summary of Geographic Information Relating to Property and Equipment

Geographical information relating to our property and equipment, net, as of September 27, 2015 and December 31, 2014 was as follows (in thousands):

	September 27, 2015		December 31, 2014
Property and equipment, net:
United States	$	3,590	$	4,140
Germany	4,970		3,185
Others	194		209
	$	8,754	$	7,534