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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2010
Sep. 30, 2010
Jun. 30, 2010
Mar. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Revenue:                      
Royalties $ 82,583 $ 96,216 $ 60,970 $ 59,235 $ 90,242 $ 31,179 $ 38,192 $ 160,542 $ 299,004 $ 320,155 $ 108,001
Contract revenue 776 4,047 5,244 3,292 679 564 670 1,322 13,359 3,235 5,006
Total revenue 83,359 100,263 66,214 62,527 90,921 31,743 38,862 161,864 312,363 323,390 113,007
Operating costs and expenses:                      
Cost of revenue 7,453 7,425 6,058 3,149 1,911 1,368 1,804 1,854 24,085 6,937 6,876
Research and development 35,841 32,318 24,220 23,317 25,028 23,002 22,985 21,691 115,696 92,706 67,252
Marketing, general and administrative 44,715 48,952 37,732 32,732 30,602 27,938 29,408 31,527 164,131 119,475 128,199
Costs (recoveries) of restatement and related legal activities, net 13,484 832 712 1,159 797 1,229 1,638 526 16,187 4,190 (13,458)
Gain from settlement       (6,200) (10,300) (10,300) (10,300) (95,900) (6,200) (126,800)  
Total operating costs and expenses 101,493 89,527 68,722 54,157 48,038 43,237 45,535 (40,302) 313,899 96,508 188,869
Operating income (loss) (18,134) 10,736 (2,508) 8,370 42,883 (11,494) (6,673) 202,166 (1,536) 226,882 (75,862)
Interest income and other income (expense), net (821) (768) (777) (652) (192) 312 316 425 (3,018) 861 4,085
Interest expense (5,453) (5,410) (5,212) (5,172) (4,990) (4,953) (3,740) (6,016) (21,247) (19,699) (20,950)
Interest and other income (expense), net (6,274) (6,178) (5,989) (5,824) (5,182) (4,641) (3,424) (5,591) (24,265) (18,838) (16,865)
Income (loss) before income taxes (24,408) 4,558 (8,497) 2,546 37,701 (16,135) (10,097) 196,575 (25,801) 208,044 (92,727)
Provision for (benefit from) income taxes 4,308 4,080 2,088 6,776 4,617 4,441 2,393 45,676 17,252 57,127 (541)
Net income (loss) $ (28,716) $ 478 $ (10,585) $ (4,230) $ 33,084 $ (20,576) $ (12,490) $ 150,899 $ (43,053) $ 150,917 $ (92,186)
Net income (loss) per share:                      
Basic (in dollars per share) $ (0.26) $ 0.00 $ (0.10) $ (0.04) $ 0.30 $ (0.18) $ (0.11) $ 1.33 $ (0.39) $ 1.34 $ (0.88)
Diluted (in dollars per share) $ (0.26) $ 0.00 $ (0.10) $ (0.04) $ 0.29 $ (0.18) $ (0.11) $ 1.28 $ (0.39) $ 1.30 $ (0.88)
Weighted average shares used in per share calculations:                      
Basic (in shares) 110,171 112,334 109,992 107,613 111,530 111,866 113,321 113,132 110,041 112,456 105,011
Diluted (in shares) 110,171 115,552 109,992 107,613 114,461 111,866 113,321 117,463 110,041 115,884 105,011