GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION (Tables)

6 Months Ended

Jun. 28, 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						Six Months Ended
	June 28, 2015			June 29, 2014			June 28, 2015			June 29, 2014
	Amount		Percent	Amount		Percent	Amount		Percent	Amount		Percent
Net revenue:
United States	$	3,006	7	$	6,392	15	$	11,574	11	$	10,575	12
South Korea	26,742		62	23,863		57	60,740		60	34,122		40
China	5,115		12	2,268		5	8,715		9	15,349		18
Taiwan	2,518		6	5,498		13	8,038		8	16,320		19
Other Asia	4,866		11	1,589		4	10,230		10	3,870		5
Europe and others	1,087		2	2,419		6	2,291		2	4,991		6
	$	43,334	100	$	42,029	100	$	101,588	100	$	85,227	100

Summary of Geographic Information Relating to Property and Equipment

Geographical information relating to our property and equipment, net, as of June 28, 2015 and December 31, 2014 was as follows (in thousands):

	June 28, 2015		December 31, 2014
Property and equipment, net:
United States	$	4,294	$	4,140
Germany	5,099		3,185
Others	194		209
	$	9,587	$	7,534