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18. Quarterly Financial Data (Unaudited) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019
Quarterly Financial Information Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |
Revenues | $ 4,383 | $ 19,466 | $ 2,118 | $ 3,815 | $ 688 | $ 1,711 | $ 5,460 | $ 3,387 | $ 29,782 | $ 11,246
Portfolio operations: |  |  |  |  |  |  |  |  |  |
Inventor royalties | 506 | 5,772 | 645 | 426 | 192 | 776 | 2,623 | 1,353 | 7,349 | 4,944
Contingent legal fees | 564 | 6,609 | 12 | 234 | 4 | 35 | 375 | 177 | 7,419 | 591
Patent acquisition expenses | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |  |
Litigation and licensing expenses - patents | 2,186 | 1,001 | 1,459 | 1,037 | 1,160 | 987 | 1,855 | 3,801 | 5,683 | 7,803
Amortization of patents | 1,159 | 1,174 | 1,305 | 1,043 | 857 | 863 | 818 | 656 | 4,681 | 3,194
Other portfolio expenses | 0 | 0 | (74) | (234) | 1,581 | (475) | 0 | 650 |  |
Total portfolio expenses | 4,415 | 14,556 | 3,347 | 2,506 | 3,794 | 2,186 | 5,671 | 6,637 | 24,824 | 18,288
Net portfolio income (loss) | (32) | 4,910 | (1,229) | 1,309 | (3,106) | (475) | (211) | (3,250) | 4,958 | (7,042)
General and administrative expenses | 6,387 | 7,692 | 5,519 | 4,878 | 4,328 | 4,630 | 3,763 | 3,655 | 24,476 | 16,376
Impairment of patent-related intangible assets | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0
Operating income (loss) | (6,419) | (2,782) | (6,748) | (3,569) | (7,434) | (5,105) | (3,974) | (6,905) | (19,518) | (23,418)
Total other income (expense) | 86,756 | 41,213 | 12,894 | (9,060) | 5,921 | (2,503) | (1,774) | 2,821 | 131,803 | 4,465
Income (loss) before provision for income taxes | 80,337 | 38,431 | 6,146 | (12,629) | (1,513) | (7,608) | (5,748) | (4,084) | 112,285 | (18,953)
Income tax (expense) benefit | (98) | (83) | 2 | 1,338 | 2,147 | 0 | (9) | (314) | 1,159 | 1,824
Net income (loss) including noncontrolling interests in subsidiaries | 80,239 | 38,348 | 6,148 | (11,291) | 634 | (7,608) | (5,757) | (4,398) | 113,444 | (17,129)
Net (income) loss attributable to noncontrolling interests in subsidiaries | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 14 | 0 | 14
Net loss attributable to Acacia Research Corporation | 80,239 | 38,348 | 6,148 | (11,291) | 634 | (7,608) | (5,757) | (4,384) | 113,444 | (17,115)
Net income (loss) attributable to common shareholders – basic | $ 65,180 | $ 30,529 | $ 4,201 | $ (12,185) | $ 327 | $ (7,608) | $ (5,757) | $ (4,384) | $ 90,330 | $ (17,422)
Basic net income (loss) per common share | $ 1.34 | $ 0.63 | $ 0.09 | $ 0.24 | $ 0.01 | $ 0.15 | $ 0.12 | $ 0.09 | $ 1.85 | $ (0.35)
Weighted average number of shares outstanding - basic | 48,508,903 | 48,467,885 | 48,457,620 | 49,875,396 | 49,875,750 | 49,828,361 | 49,696,016 | 49,655,881 | 48,840,829 | 49,764,002
Net loss attributable to common stockholders - diluted | $ 65,352 | $ 29,204 | $ 4,201 | $ (12,185) | $ (2,624) | $ (7,608) | $ (5,757) | $ (4,384) | $ 88,471 | $ (20,373)
Diluted net loss per share of common share | $ 1.33 | $ 0.32 | $ 0.09 | $ 0.24 | $ 0.05 | $ 0.15 | $ 0.12 | $ 0.09 | $ 1.54 | $ (0.40)
Weighted average number of shares outstanding - diluted | 49,244,141 | 90,624,702 | 49,033,824 | 49,875,396 | 54,406,835 | 49,828,361 | 49,696,016 | 49,655,881 | 57,435,128 | 50,896,773

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