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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Revenue:        
Royalties $ 68,298 $ 66,823 $ 194,010 $ 196,173
Contract and other revenue 21,557 6,956 45,028 23,332
Total revenue 89,855 73,779 239,038 219,505
Operating costs and expenses:        
Cost of revenue [1] 19,424 11,111 45,720 34,004
Research and development [1] 33,820 27,784 91,100 85,506
Sales, general and administrative [1] 24,795 17,860 69,679 53,701
Gain from sale of intellectual property 0 (106) 0 (3,262)
Gain from settlement 0 (510) (579) (1,530)
Total operating costs and expenses 78,039 56,139 205,920 168,419
Operating income (loss) 11,816 17,640 33,118 51,086
Interest income and other income (expense), net 142 539 1,522 874
Interest expense (3,193) (3,117) (9,497) (9,291)
Interest and other income (expense), net (3,051) (2,578) (7,975) (8,417)
Income before income taxes 8,765 15,062 25,143 42,669
Provision for (benefit from) income taxes 4,254 (166,971) 14,878 (155,727)
Net Income (Loss) $ 4,511 $ 182,033 $ 10,265 $ 198,396
Net income per share:        
Earnings Per Share, Basic $ 0.04 $ 1.56 $ 0.09 $ 1.71
Earnings Per Share, Diluted $ 0.04 $ 1.52 $ 0.09 $ 1.67
Weighted average shares used in per share calculation:        
Basic (in shares) 110,214 116,444 109,951 115,940
Diluted (in shares) 113,723 119,542 112,805 118,997
[1] Includes stock-based compensation