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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
Revenue: |  |  |  |  |
Royalties |  | $ 66,823 | $ 64,009 | $ 196,173 | $ 207,387
Contract and other revenue |  | 6,956 | 5,703 | 23,332 | 17,131
Total revenue |  | 73,779 | 69,712 | 219,505 | 224,518
Operating costs and expenses: |  |  |  |  |
Cost of revenue | [1] | 11,111 | 10,540 | 34,004 | 31,199
Research and development | [1] | 27,784 | 27,014 | 85,506 | 81,580
Sales, general and administrative | [1] | 17,860 | 18,200 | 53,701 | 55,639
Gain from sale of intellectual property |  | (106) | 0 | (3,262) | (170)
Restructuring charges |  | 0 | 0 | 0 | 39
Gain from settlement |  | (510) | (510) | (1,530) | (1,530)
Total operating costs and expenses |  | 56,139 | 55,244 | 168,419 | 166,757
Operating income (loss) |  | 17,640 | 14,468 | 51,086 | 57,761
Interest income and other income (expense), net |  | 539 | (549) | 874 | (432)
Interest expense |  | (3,117) | (3,059) | (9,291) | (21,755)
Interest and other income (expense), net |  | (2,578) | (3,608) | (8,417) | (22,187)
Income before income taxes |  | 15,062 | 10,860 | 42,669 | 35,574
Provision for (benefit from) income taxes |  | (166,971) | 5,347 | (155,727) | 17,214
Net Income (Loss) |  | $ 182,033 | $ 5,513 | $ 198,396 | $ 18,360
Net income per share: |  |  |  |  |
Earnings Per Share, Basic |  | $ 1.56 | $ 0.05 | $ 1.71 | $ 0.16
Earnings Per Share, Diluted |  | $ 1.52 | $ 0.05 | $ 1.67 | $ 0.16
Weighted average shares used in per share calculation: |  |  |  |  |
Basic (in shares) |  | 116,444 | 114,523 | 115,940 | 114,080
Diluted (in shares) |  | 119,542 | 118,206 | 118,997 | 117,540
[1] | Includes stock-based compensation

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