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Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017
QUARTERLY FINANCIAL DATA (unaudited) [Abstract] |  |  |  |  |  |  |  |  |  |
Revenues | $ 49,203 | $ 13,725 | $ 6,485 | $ 62,093 | $ 3,458 | $ 36,633 | $ 16,457 | $ 8,854 | $ 131,506 | $ 65,402
Inventor royalties | 11,002 | 1,181 | 1,241 | 21,744 | 13 | 0 | 4,273 | 666 | 35,168 | 4,952
Contingent legal fees | 11,756 | 2,949 | 1,037 | 15,759 | 646 | 12,173 | 3,236 | 627 | 31,501 | 16,682
Patent acquisition expenses | 0 | 0 | 0 | 4,000 | 0 | 0 | 0 | 0 | 4,000 | 0
Litigation and licensing expenses - patents | 1,689 | 1,549 | 2,639 | 2,989 | 3,626 | 4,073 | 4,134 | 6,386 | 8,866 | 18,219
Amortization of patents | 11,560 | 4,952 | 5,278 | 5,330 | 5,443 | 5,625 | 5,571 | 5,515 | 27,120 | 22,154
Marketing, general and administrative expenses (including non-cash stock compensation expense) | (2,778) | (5,855) | (6,916) | (3,301) | 140 | (12,956) | (7,167) | (7,236) | (18,850) | (27,219)
Impairment of Patent-Related Intangible Assets | 0 | 0 | 28,210 | 0 | 0 | 2,248 | 0 | 0 | 28,210 | 2,248
Other | 400 | 2,202 | 0 | 0 | 1,200 | 0 | 0 | 0 | 2,602 | 1,200
Total portfolio operations | 36,407 | 12,833 | 38,405 | 49,822 | 10,928 | 24,119 | 17,214 | 13,194 |  |
Operating loss | 10,018 | (4,963) | (38,836) | 8,970 | (7,330) | (442) | (7,924) | (11,576) | (24,811) | (27,272)
Net portfolio income (loss) | 12,796 | 892 | (31,920) | 12,271 | (7,470) | 12,514 | (757) | (4,340) | (5,961) | (53)
Total other income (expense) | (20,988) | (27,595) | 10,615 | (40,890) | (102,950) | 159,027 | (4,862) | 696 | (1,629) | 1,000
Income (loss) from operations before (provision for) benefit from income taxes | (10,970) | (32,558) | (28,221) | (31,920) | (110,280) | 158,585 | (12,786) | (10,880) | (103,669) | 24,639
(Provision) benefit for income taxes | (397) | (306) | (285) | (191) | (20) | (216) | (1,478) | (1,241) | (1,179) | (2,955)
Net income (loss) including noncontrolling interests in subsidiaries | (11,367) | (32,864) | (28,506) | (32,111) | (110,300) | 158,369 | (14,264) | (12,121) | (104,848) | 21,684
Net (income) loss attributable to noncontrolling interests in subsidiaries | 2 | 331 | (79) | (73) | (97) | (96) | (12) | (291) | 181 | (496)
Net income (loss) attributable to Acacia Research Corporation | $ (11,369) | $ (33,195) | $ (28,427) | $ (32,038) | $ (110,203) | $ 158,465 | $ (14,252) | $ (11,830) | $ (105,029) | $ 22,180
Earnings Per Share, Basic and Diluted | $ (0.23) | $ (0.67) | $ (0.57) | $ (0.63) | $ (2.18) | $ 3.13 | $ (0.28) | $ (0.24) | $ (2.10) | $ 0.44
Weighted Average Number of Shares Outstanding, Basic and Diluted | 49,639,172 | 49,557,748 | 50,061,812 | 50,632,958 | 50,590,460 | 50,554,234 | 50,499,948 | 50,333,056 |  |
Weighted Average Number of Shares Outstanding, Diluted | 49,639,172 | 49,557,748 | 50,061,812 | 50,632,958 | 50,590,460 | 50,599,974 | 50,499,948 | 50,333,056 | 49,969,062 | 50,692,012

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