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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Revenue |  |  |
Revenue | $ 454,793 | $ 328,304 | $ 246,322
Cost of revenue |  |  |
Cost of product revenue | 88,976 | 49,397 | 37,749
Cost of contract and other revenue | 4,668 | 4,756 | 5,647
Amortization of acquired intangible assets | 13,935 | 16,241 | 17,352
Cost of revenue | 107,579 | 70,394 | 60,748
Gross profit | 347,214 | 257,910 | 185,574
Operating expenses |  |  |
Research and development | 158,769 | 135,678 | 139,837
Sales, general and administrative | 106,718 | 91,057 | 86,441
Amortization of acquired intangible assets | 1,674 | 1,226 | 1,061
Restructuring and other charges | 0 | 368 | 4,089
Change in fair value of earn-out liability | 3,111 | 5,300 | (1,800)
Total operating expenses | 270,272 | 233,629 | 229,628
Operating income (loss) | 76,942 | 24,281 | (44,054)
Interest income and other income (expense), net | 7,771 | 9,711 | 17,855
Gain on sale of equity security | 3,547 | 0 | 0
Loss on extinguishment of debt | (83,626) | 0 | 0
Loss on fair value adjustment of derivatives, net | (10,585) | 0 | 0
Interest expense | (1,874) | (10,706) | (10,340)
Interest and other income (expense), net | (84,767) | (995) | 7,515
Income (loss) before income taxes | (7,825) | 23,286 | (36,539)
Provision for income taxes | 6,485 | 4,952 | 3,932
Net income (loss) | $ (14,310) | $ 18,334 | $ (40,471)
Net income (loss) per share: |  |  |
Basic net income (loss) per share | $ (0.13) | $ 0.17 | $ (0.36)
Diluted net income (loss) per share | $ (0.13) | $ 0.16 | $ (0.36)
Weighted-average shares used in per share calculations: |  |  |
Basic (in shares) | 109,472 | 110,538 | 113,254
Diluted (in shares) | 109,472 | 114,865 | 113,254
Product revenue |  |  |
Revenue |  |  |
Revenue | $ 227,068 | $ 143,935 | $ 113,996
Royalties |  |  |
Revenue |  |  |
Revenue | 139,816 | 136,706 | 84,560
Contract and other revenue |  |  |
Revenue |  |  |
Revenue | $ 87,909 | $ 47,663 | $ 47,766

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