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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Statement [Abstract] |  |  |  |
Revenues | $ 2,118 | $ 5,460 | $ 5,933 | $ 8,847
Portfolio operations: |  |  |  |
Inventor royalties | 645 | 2,623 | 1,071 | 3,976
Contingent legal fees | 12 | 375 | 246 | 552
Litigation and licensing expenses - patents | 1,459 | 1,855 | 2,496 | 5,656
Amortization of patents | 1,305 | 818 | 2,348 | 1,474
Other portfolio expenses (income) | (74) |  | (308) | 650
Total portfolio operations | 3,347 | 5,671 | 5,853 | 12,308
Net portfolio income (loss) | (1,229) | (211) | 80 | (3,461)
General and administrative expenses(1) | 5,519 | 3,763 | 10,397 | 7,418
Operating loss | (6,748) | (3,974) | (10,317) | (10,879)
Other income (expense): |  |  |  |
Change in fair value of investment, net (Note 5) | 2,677 | 6,980 | 6,785 | 13,888
Gain (loss) on sale of investment (Note 5) | 554 | (1,642) | (2,762) | (7,232)
Impairment of other investment | 0 | (8,195) | 0 | (8,195)
Change in fair value of the Series A and B warrants and embedded derivatives | (62,902) | 0 | (67,284) | 0
Change in fair value of equity securities derivative and forward contract | 81,553 | 0 | 81,553 | 0
Change in fair value of trading securities | 3,525 | (61) | (2,592) | 614
Gain (loss) on sale of trading securities | (7,121) | 31 | (7,009) | (12)
Loss on foreign currency exchange | (4,890) | 0 | (4,890) | 0
Interest expense on Senior Secured Notes | (768) | 0 | (768) | 0
Interest income and other | 266 | 1,113 | 801 | 1,984
Total other income (expense) | 12,894 | (1,774) | 3,834 | 1,047
Income (loss) before income taxes | 6,146 | (5,748) | (6,483) | (9,832)
Income tax benefit (expense) | 2 | (9) | 1,340 | (323)
Net income (loss) including noncontrolling interests in subsidiaries | 6,148 | (5,757) | (5,143) | (10,155)
Net loss attributable to noncontrolling interests in subsidiaries | 0 | 0 | 0 | 14
Net income (loss) attributable to Acacia Research Corporation | 6,148 | (5,757) | (5,143) | (10,141)
Net income (loss) attributable to common stockholders - basic and diluted | $ 4,201 | $ (5,757) | $ (7,105) | $ (10,141)
Basic net income (loss) per common share | $ 0.09 | $ (0.12) | $ (0.14) | $ (0.20)
Weighted average number of shares outstanding - basic | 48,457,620 | 49,696,016 | 49,166,508 | 49,676,059
Diluted net income (loss) per common share | $ 0.09 | $ (0.12) | $ (0.14) | $ (0.20)
Weighted average number of shares outstanding - diluted | 49,033,824 | 49,696,016 | 49,166,508 | 49,676,059

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