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Segments and Major Customers (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Financial information of business segments    
Revenues $ 66,866 $ 62,863
Other patent royalties received 5,237 2,414
Customer licensing income 72,103 65,277
Segment operating expenses 26,857 26,125
Segment operating income (loss) 45,246 39,152
Operating income (loss) 1,441 (17,558)
Interest and other income (expense), net (7,332) (6,482)
Loss before income taxes (5,891) (24,040)
MID Segment
    
Financial information of business segments    
Revenues 59,674 57,088
Other patent royalties received 1,875 0
Customer licensing income 61,549 57,088
Segment operating expenses 8,924 11,550
Segment operating income (loss) 52,625 45,538
CTO Segment
    
Financial information of business segments    
Revenues 0 0
Other patent royalties received 0 0
Customer licensing income 0 0
Segment operating expenses 7,858 6,503
Segment operating income (loss) (7,858) (6,503)
All Other
    
Financial information of business segments    
Revenues 7,192 5,775
Other patent royalties received 3,362 2,414
Customer licensing income 10,554 8,189
Segment operating expenses 10,075 8,072
Segment operating income (loss) 479 117
Reconciling Items
    
Financial information of business segments    
Operating income (loss) $ (43,805) $ (56,710)