GEOGRAPHIC AND CUSTOMER CONCENTRATION INFORMATION (Tables)

12 Months Ended

Dec. 31, 2014

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,
	2014			2013			2012
	Amount		Percent	Amount		Percent	Amount		Percent
Net revenue:
United States	$	25,716	14	$	12,350	10	$	17,476	14
Korea	87,585		49	22,173		19	47,611		38
Taiwan	32,304		18	50,782		43	28,577		23
China	17,369		10	20,250		17	8,562		7
Other Asia	6,869		4	8,740		7	13,615		10
Europe and others	8,561		5	5,139		4	10,685		8
	$	178,404	100	$	119,434	100	$	126,526	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):

	2014		2013
Property and equipment, net:
United States	$	4,140	$	4,949
Germany	3,185		4,129
Others	209		138
	$	7,534	$	9,216