GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION (Tables)

12 Months Ended

Dec. 31, 2015

Geographic and Customer Concentration Information [Abstract]

Summary of Net Revenue by Geographic Areas Based on the Installation Locations of the Systems and the Location of Services Rendered

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):

	For the Years Ended December 31,
	2015			2014			2013
	Amount		Percent	Amount		Percent	Amount		Percent
Net revenue:
United States	$	25,061	15	$	25,716	14	$	12,350	10
Korea	73,798		43	87,585		49	22,173		19
Taiwan	17,537		10	32,304		18	50,782		43
China	29,209		17	17,369		10	20,250		17
Other Asia	19,560		11	6,869		4	8,740		7
Europe and others	7,367		4	8,561		5	5,139		4
	$	172,532	100	$	178,404	100	$	119,434	100

Summary of Geographic Information Relating to Property and Equipment, Net

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

	2015		2014
Property and equipment, net:
United States	$	3,350	$	4,140
Germany	4,712		3,185
Others	174		209
	$	8,236	$	7,534