Segment Information Geographical Information (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 69,300,000	$ 63,725,000	$ 77,584,000	$ 75,487,000	$ 79,506,000	$ 97,876,000	$ 79,856,000	$ 73,627,000	$ 286,096,000	$ 330,865,000	$ 284,311,000
Property and equipment, net	17,713,000				15,366,000				17,713,000	15,366,000
Goodwill	0				29,748,000				0	29,748,000
Intangible Assets, Net (Excluding Goodwill)	70,284,000				85,043,000				70,284,000	85,043,000
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									105,858,000	105,671,000	96,449,000
Property and equipment, net	8,572,000				8,748,000				8,572,000	8,748,000
Goodwill	0				29,588,000				0	29,588,000
Intangible Assets, Net (Excluding Goodwill)	68,903,000				82,975,000				68,903,000	82,975,000
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									3,310,000	1,371,000	912,000
Property and equipment, net	953,000				568,000				953,000	568,000
Intangible Assets, Net (Excluding Goodwill)	211,000				386,000				211,000	386,000
China [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									45,419,000	69,503,000	58,862,000
Property and equipment, net	4,685,000				2,801,000				4,685,000	2,801,000
Japan [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									39,435,000	29,337,000	15,879,000
Other APAC [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									31,695,000	45,125,000	31,991,000
Property and equipment, net	358,000				321,000				358,000	321,000
Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									180,238,000	225,194,000	187,862,000
Property and equipment, net	9,141,000				6,618,000				9,141,000	6,618,000
Intangible Assets, Net (Excluding Goodwill)	1,381,000				2,068,000				1,381,000	2,068,000
Europe, the Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									60,379,000	79,858,000	80,218,000
Property and equipment, net	3,145,000				2,928,000				3,145,000	2,928,000
Goodwill	0				160,000				0	160,000
Intangible Assets, Net (Excluding Goodwill)	1,170,000				1,682,000				1,170,000	1,682,000
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									116,549,000	143,965,000	106,732,000
Property and equipment, net	5,043,000				3,122,000				5,043,000	3,122,000
India [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	3,110,000				2,876,000				3,110,000	2,876,000
Germany [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									18,580,000	39,266,000	41,271,000
Other EMEA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues									41,799,000	40,592,000	38,947,000
Property and equipment, net	$ 35,000				$ 52,000				$ 35,000	$ 52,000