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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Revenue:        
Royalties $ 62,387 $ 69,741 $ 129,350 $ 143,378
Contract and other revenue 10,425 6,777 16,376 11,428
Total revenue 72,812 76,518 145,726 154,806
Operating costs and expenses:        
Cost of revenue [1] 12,137 10,637 22,893 20,659
Research and development [1] 29,188 27,668 57,722 54,566
Sales, general and administrative [1] 17,339 18,619 35,841 37,439
Gain from sale of intellectual property (896) 0 (3,156) (170)
Restructuring charges 0 0 0 39
Gain from settlement (510) (510) (1,020) (1,020)
Total operating costs and expenses 57,258 56,414 112,280 111,513
Operating income (loss) 15,554 20,104 33,446 43,293
Interest income and other income (expense), net 203 104 335 117
Interest expense (3,091) (8,770) (6,174) (18,696)
Interest and other income (expense), net (2,888) (8,666) (5,839) (18,579)
Income before income taxes 12,666 11,438 27,607 24,714
Provision for income taxes 5,805 6,395 11,244 11,867
Net Income (Loss) $ 6,861 $ 5,043 $ 16,363 $ 12,847
Net income per share:        
Earnings Per Share, Basic $ 0.06 $ 0.04 $ 0.14 $ 0.11
Earnings Per Share, Diluted $ 0.06 $ 0.04 $ 0.14 $ 0.11
Weighted average shares used in per share calculation:        
Basic (in shares) 116,027 114,116 115,683 113,854
Diluted (in shares) 120,939 117,398 119,225 116,733
[1] Includes stock-based compensation