Segment Reporting Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	$ 237,080		$ 250,112		$ 259,025
Long-Lived Assets (1)	57,779	[1]	60,692	[1]	60,884	[1]
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	62,667		66,267		71,700
Long-Lived Assets (1)	48,432		51,715		53,368
Other North American Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	144		193		842
Long-Lived Assets (1)	0		0		0
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	28,050		36,896		40,155
Long-Lived Assets (1)	16		24		39
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	23,503		22,507		23,938
Long-Lived Assets (1)	2,956		3,492		2,153
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	26,353		23,899		21,883
Long-Lived Assets (1)	9		8		5
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	15,873		16,183		19,079
Long-Lived Assets (1)	2,424		1,417		1,333
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	33,881		37,300		26,429
Long-Lived Assets (1)	86		215		163
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	14,686		14,329		17,392
Long-Lived Assets (1)	23		1		5
Other Asian Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	1,259		1,284		1,629
Long-Lived Assets (1)	3,727		3,717		3,716
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	30,664		31,254		35,978
Long-Lived Assets (1)	$ 106		$ 103		$ 102

[1] Long-lived assets consist of property, plant and equipment.