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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