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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Revenue:        
Royalties $ 69,741 $ 57,009 $ 143,378 $ 123,231
Contract and other revenue 6,777 910 11,428 1,554
Total revenue 76,518 57,919 154,806 124,785
Operating costs and expenses:        
Cost of revenue 10,637 [1] 7,365 [1] 20,659 [1] 13,899 [1]
Research and development 27,668 [1] 30,777 [1] 54,566 [1] 63,625 [1]
Marketing, general and administrative 18,619 [1] 14,136 [1] 37,439 [1] 39,258 [1]
Gain from sale of intellectual property 0 (103) (170) (1,388)
Restructuring charges 0 0 39 2,206
Gain from settlement (510) 0 (1,020) 0
Total operating costs and expenses 56,414 52,175 111,513 117,600
Operating income (loss) 20,104 5,744 43,293 7,185
Interest income and other income (expense), net 104 (1,419) 117 (1,439)
Interest expense (8,770) (7,426) (18,696) (14,738)
Interest and other income (expense), net (8,666) (8,845) (18,579) (16,177)
Income (loss) before income taxes 11,438 (3,101) 24,714 (8,992)
Provision for income taxes 6,395 4,743 11,867 9,254
Net Income (Loss) Attributable to Parent $ 5,043 $ (7,844) $ 12,847 $ (18,246)
Net income (loss) per share:        
Earnings Per Share, Basic $ 0.04 $ (0.07) $ 0.11 $ (0.16)
Earnings Per Share, Diluted $ 0.04 $ (0.07) $ 0.11 $ (0.16)
Weighted average shares used in per share calculation:        
Basic (in shares) 114,116 112,183 113,854 111,892
Diluted (in shares) 117,398 112,183 116,733 111,892
[1] Includes stock-based compensation