Segment Reporting Geographic Information (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	$ 250,112		$ 259,025		$ 297,366
Long-Lived Assets (1)	60,692	[1]	60,884	[1]	64,517	[1]
United States of America
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	66,267		71,700		78,673
Long-Lived Assets (1)	51,715	[1]	53,368	[1]	58,458	[1]
Other North American Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	193		842		2,570
Long-Lived Assets (1)	0	[1]	0	[1]	0	[1]
Korea
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	36,896		40,155		37,277
Long-Lived Assets (1)	24	[1]	39	[1]	31	[1]
Taiwan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	22,507		23,938		25,741
Long-Lived Assets (1)	3,492	[1]	2,153	[1]	1,545	[1]
Singapore
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	23,899		21,883		30,644
Long-Lived Assets (1)	8	[1]	5	[1]	6	[1]
China
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	16,183		19,079		22,845
Long-Lived Assets (1)	1,417	[1]	1,333	[1]	1,800	[1]
Hong Kong
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	37,300		26,429		39,262
Long-Lived Assets (1)	215	[1]	163	[1]	19	[1]
Japan
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	14,329		17,392		20,498
Long-Lived Assets (1)	1	[1]	5	[1]	10	[1]
Other Asian Countries
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	1,284		1,629		1,590
Long-Lived Assets (1)	3,717	[1]	3,716	[1]	2,548	[1]
Europe
Revenues from External Customers and Long-Lived Assets [Line Items]
Total Net Revenues	31,254		35,978		38,266
Long-Lived Assets (1)	$ 103	[1]	$ 102	[1]	$ 100	[1]

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