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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Revenue |  |  |
Revenue | $ 461,117 | $ 454,793 | $ 328,304
Cost of revenue |  |  |
Cost of product revenue | 84,495 | 88,976 | 49,397
Cost of contract and other revenue | 5,403 | 4,668 | 4,756
Amortization of acquired intangible assets | 13,524 | 13,935 | 16,241
Cost of revenue | 103,422 | 107,579 | 70,394
Gross profit | 357,695 | 347,214 | 257,910
Operating expenses |  |  |
Research and development | 156,827 | 158,769 | 135,678
Sales, general and administrative | 108,149 | 106,718 | 91,057
Amortization of acquired intangible assets | 1,217 | 1,674 | 1,226
Restructuring and other charges | 9,368 | 0 | 368
Gain on divestiture | (90,784) | 0 | 0
Impairment of assets | 10,045 | 0 | 0
Change in fair value of earn-out liability | 9,234 | 3,111 | 5,300
Total operating expenses | 204,056 | 270,272 | 233,629
Operating income | 153,639 | 76,942 | 24,281
Interest income and other income (expense), net | 11,327 | 7,771 | 9,711
Gain on sale of equity security | 0 | 3,547 | 0
Loss on extinguishment of debt | 0 | (83,626) | 0
Loss on fair value adjustment of derivatives, net | (240) | (10,585) | 0
Gain on sale of non-marketable equity security, gross | 23,924 |  |
Interest expense | (1,490) | (1,874) | (10,706)
Interest and other income (expense), net | 33,521 | (84,767) | (995)
Income (loss) before income taxes | 187,160 | (7,825) | 23,286
Provision for (benefit from) income taxes | (146,744) | 6,485 | 4,952
Net income (loss) | $ 333,904 | $ (14,310) | $ 18,334
Net income (loss) per share: |  |  |
Basic net income (loss) per share | $ 3.09 | $ (0.13) | $ 0.17
Diluted net income (loss) per share | $ 3.01 | $ (0.13) | $ 0.16
Weighted-average shares used in per share calculations: |  |  |
Basic (in shares) | 108,183 | 109,472 | 110,538
Diluted (in shares) | 110,889 | 109,472 | 114,865
Product revenue |  |  |
Revenue |  |  |
Revenue | $ 224,632 | $ 227,068 | $ 143,935
Royalties |  |  |
Revenue |  |  |
Revenue | 150,110 | 139,816 | 136,706
Contract and other revenue |  |  |
Revenue |  |  |
Revenue | $ 86,375 | $ 87,909 | $ 47,663

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