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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Revenue: |  |  |  |
Royalties |  | $ 264,614 | $ 262,415 | $ 271,521
Contract and other revenue |  | 71,983 | 33,863 | 25,037
Total revenue |  | 336,597 | 296,278 | 296,558
Operating costs and expenses: |  |  |  |
Cost of revenue | [1] | 67,090 | 45,344 | 41,947
Research and development | [1] | 129,844 | 111,110 | 110,025
Sales, general and administrative | [1] | 95,145 | 70,554 | 74,770
Restructuring charges |  | 0 | 3,576 | 39
Impairment of in-process research and development intangible asset |  | 18,300 | 0 | 0
Change in contingent consideration liability |  | (6,845) | 0 | 0
Gain from sale of intellectual property |  | 0 | (3,686) | (3,529)
Gain from settlement |  | (579) | (2,040) | (2,040)
Total operating costs and expenses |  | 302,955 | 224,858 | 221,212
Operating income (loss) |  | 33,642 | 71,420 | 75,346
Interest income (expense), net |  | 1,740 | 1,224 | (276)
Interest expense |  | (12,745) | (12,413) | (24,820)
Interest and other income (expense), net |  | (11,005) | (11,189) | (25,096)
Income before income taxes |  | 22,637 | 60,231 | 50,250
Provision for (benefit from) income taxes |  | 15,817 | (151,157) | 24,049
Net income |  | $ 6,820 | $ 211,388 | $ 26,201
Net income per share: |  |  |  |
Basic (in dollars per share) |  | $ 0.06 | $ 1.84 | $ 0.23
Diluted (in dollars per share) |  | $ 0.06 | $ 1.80 | $ 0.22
Weighted average shares used in per share calculations: |  |  |  |
Basic (in shares) |  | 110,162 | 114,814 | 114,318
Diluted (in shares) |  | 113,140 | 117,484 | 117,624
[1] | * Includes stock-based compensation: Cost of revenue$56 $63 $44Research and development$9,165 $6,762 $7,216Sales, general and administrative$11,792 $8,271 $7,470

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