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CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (UNAUDITED) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Income Statement [Abstract] |  |  |  |
Revenues | $ 17,400 | $ 2,118 | $ 23,203 | $ 5,933
Patent portfolio operations: |  |  |  |
Inventor royalties | 448 | 645 | 543 | 1,071
Contingent legal fees | 4,356 | 12 | 5,450 | 246
Litigation and licensing expenses - patents | 1,837 | 1,459 | 4,099 | 2,496
Amortization of patents | 2,612 | 1,305 | 4,474 | 2,348
Other patent portfolio income | 0 | (74) | 0 | (308)
Patent portfolio expenses | 9,253 | 3,347 | 14,566 | 5,853
Net patent portfolio income (loss) | 8,147 | (1,229) | 8,637 | 80
General and administrative expenses | 6,503 | 5,519 | 12,669 | 10,397
Operating income (loss) | 1,644 | (6,748) | (4,032) | (10,317)
Other income (expense): |  |  |  |
Change in fair value of investment, net | 0 | 2,677 | 0 | 6,785
Gain (loss) on sale of investment | 0 | 554 | 839 | (2,762)
Change in fair value of the Series A and B warrants and embedded derivatives | (5,576) | (62,902) | (204,485) | (67,284)
Change in fair value of equity securities | 11,158 | 85,078 | 49,007 | 78,961
Gain (loss) on sale of equity securities | 14,617 | (7,121) | 15,436 | (7,009)
Earnings on equity investment in joint venture | 7 | 0 | 2,737 | 0
Loss on foreign currency exchange | (152) | (4,890) | (176) | (4,890)
Interest expense on Senior Secured Notes | (1,760) | (768) | (3,070) | (768)
Interest income and other | 85 | 266 | 59 | 801
Total other income (expense) | 18,379 | 12,894 | (139,653) | 3,834
Income (loss) before income taxes | 20,023 | 6,146 | (143,685) | (6,483)
Income tax (expense) benefit | (510) | 2 | (520) | 1,340
Net income (loss) including noncontrolling interests in subsidiaries | 19,513 | 6,148 | (144,205) | (5,143)
Net income attributable to noncontrolling interests in subsidiaries | (6) | 0 | (906) | 0
Net income (loss) attributable to Acacia Research Corporation | $ 19,507 | $ 6,148 | $ (145,111) | $ (5,143)
Net income (loss) attributable to common stockholders - basic | $ 15,108 | $ 4,201 | $ (147,405) | $ (7,105)
Basic net income (loss) per common share | $ 0.31 | $ 0.09 | $ (3.03) | $ (0.14)
Weighted average number of shares outstanding - basic | 48,729,020 | 48,457,620 | 48,662,897 | 49,166,508
Net income (loss) attributable to common stockholders - diluted | $ 18,792 | $ 4,201 | $ (147,405) | $ (7,105)
Diluted net income (loss) per common share | $ 0.23 | $ 0.09 | $ (3.03) | $ (0.14)
Weighted average number of shares outstanding - diluted | 83,086,980 | 49,033,824 | 48,662,897 | 49,166,508

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