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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Revenue:        
Royalties $ 64,009 $ 71,013 $ 207,387 $ 194,244
Contract and other revenue 5,703 2,281 17,131 3,835
Total revenue 69,712 73,294 224,518 198,079
Operating costs and expenses:        
Cost of revenue 10,540 [1] 8,958 [1] 31,199 [1] 22,857 [1]
Research and development 27,014 [1] 27,553 [1] 81,580 [1] 91,178 [1]
Marketing, general and administrative 18,200 [1] 18,698 [1] 55,639 [1] 57,956 [1]
Gain from sale of intellectual property 0 0 (170) (1,388)
Restructuring charges 0 1,129 39 3,335
Impairment of Goodwill and Long Lived Assets 0 8,070 0 8,070
Gain from settlement (510) (179) (1,530) (179)
Total operating costs and expenses 55,244 64,229 166,757 181,829
Operating income (loss) 14,468 9,065 57,761 16,250
Interest income and other income (expense), net (549) 66 (432) (1,373)
Interest expense (3,059) (8,552) (21,755) (23,290)
Interest and other income (expense), net (3,608) (8,486) (22,187) (24,663)
Income (loss) before income taxes 10,860 579 35,574 (8,413)
Provision for income taxes 5,347 6,304 17,214 15,558
Net Income (Loss) $ 5,513 $ (5,725) $ 18,360 $ (23,971)
Net income (loss) per share:        
Earnings Per Share, Basic $ 0.05 $ (0.05) $ 0.16 $ (0.21)
Earnings Per Share, Diluted $ 0.05 $ (0.05) $ 0.16 $ (0.21)
Weighted average shares used in per share calculation:        
Basic (in shares) 114,523 112,640 114,080 112,144
Diluted (in shares) 118,206 112,640 117,540 112,144
[1] Includes stock-based compensation