Segment Information - Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	$ 65,438	$ 77,584	$ 133,616	$ 153,071
Property and equipment, net	16,933		16,933		17,713
Total Intangible Assets, Net	63,242		63,242		70,284
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	30,078	25,530	56,128	54,291
Property and equipment, net	8,574		8,574		8,572
Total Intangible Assets, Net	62,205		62,205		68,903
Foreign Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	35,360	52,054	77,488	98,780
Property and equipment, net	8,359		8,359		9,141
Total Intangible Assets, Net	1,037		1,037		1,381
Other North America
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	434	861	1,086	1,661
Property and equipment, net	947		947		953
Total Intangible Assets, Net	124		124		211
Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	19,432	38,822	45,954	65,300
Property and equipment, net	7,386		7,386		8,153
CHINA [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	8,046	17,566	14,791	31,113
Property and equipment, net	4,278		4,278		4,685
JAPAN
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,627	16,774	18,456	23,407
INDIA
Revenues from External Customers and Long-Lived Assets [Line Items]
Property and equipment, net	2,853		2,853		3,110
Other Asia Pacific [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	5,759	4,482	12,707	10,780
Property and equipment, net	255		255		358
Europe, the Middle East and Africa [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Revenues	15,494	12,371	30,448	31,819
Property and equipment, net	26		26		35
Total Intangible Assets, Net	$ 913		$ 913		$ 1,170