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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Income Statement [Abstract] |  |  |  |
Revenues | $ 19,466 | $ 1,711 | $ 25,399 | $ 10,558
Portfolio operations: |  |  |  |
Inventor royalties | 5,772 | 776 | 6,843 | 4,752
Contingent legal fees | 6,609 | 35 | 6,855 | 587
Litigation and licensing expenses - patents | 1,001 | 987 | 3,497 | 6,643
Amortization of patents | 1,174 | 863 | 3,522 | 2,337
Other portfolio expenses (income) | 0 | (475) | (308) | 175
Total portfolio operations | 14,556 | 2,186 | 20,409 | 14,494
Net portfolio income (loss) | 4,910 | (475) | 4,990 | (3,936)
General and administrative expenses(1) | 7,692 | 4,630 | 18,089 | 12,048
Operating loss | (2,782) | (5,105) | (13,099) | (15,984)
Other income (expense): |  |  |  |
Change in fair value of investment, net (Note 5) | (3,081) | (4,266) | 3,704 | 9,622
Loss on sale of investment (Note 5) | 0 | (915) | (2,762) | (8,147)
Impairment of other investment | 0 | 0 | 0 | (8,195)
Gain on disposal of other investment | 0 | 2,000 | 0 | 2,000
Change in fair value of the Series A and B warrants and embedded derivatives | 20,672 | 0 | (46,612) | 0
Change in fair value of equity securities derivative and forward contract | (64,011) | 0 | 17,542 | 0
Gain on sale of prepaid investment and derivative | 2,845 | 0 | 2,845 | 0
Change in fair value of trading securities and equity securities - private | 84,499 | (482) | 81,907 | 132
Gain (loss) on sale of trading securities | 2,737 | 238 | (4,272) | 226
Loss on foreign currency exchange | (48) | (106) | (4,938) | (106)
Interest expense on Senior Secured Notes | (2,410) | 0 | (3,178) | 0
Interest income and other | 10 | 1,028 | 811 | 3,012
Total other income (expense) | 41,213 | (2,503) | 45,047 | (1,456)
Income (loss) before income taxes | 38,431 | (7,608) | 31,948 | (17,440)
Income tax benefit (expense) | (83) | 0 | 1,257 | (323)
Net income (loss) including noncontrolling interests in subsidiaries | 38,348 | (7,608) | 33,205 | (17,763)
Net loss attributable to noncontrolling interests in subsidiaries | 0 | 0 | 0 | 14
Net income (loss) attributable to Acacia Research Corporation | 38,348 | (7,608) | 33,205 | (17,749)
Net income (loss) attributable to common stockholders - basic | $ 30,529 | $ (7,608) | $ 24,838 | $ (17,749)
Basic net income (loss) per common share | $ 0.63 | $ (0.15) | $ 0.51 | $ (0.36)
Weighted average number of shares outstanding - basic | 48,467,885 | 49,828,361 | 48,949,706 | 49,727,385
Net income (loss) attributable to common stockholders - diluted | $ 29,204 | $ (7,608) | $ 21,380 | $ (17,749)
Diluted net income (loss) per common share | $ 0.32 | $ (0.15) | $ 0.36 | $ (0.36)
Weighted average number of shares outstanding - diluted | 90,624,702 | 49,828,361 | 60,153,773 | 49,727,385

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