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Consolidated Statements of Operations - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019
Income Statement [Abstract] |  |
Revenues | $ 29,782 | $ 11,246
Portfolio operations: |  |
Inventor royalties | 7,349 | 4,944
Contingent legal fees | 7,419 | 591
Litigation and licensing expenses - patents | 5,683 | 7,803
Amortization of patents | 4,681 | 3,194
Other portfolio expenses (income) | (308) | 1,756
Total portfolio expenses | 24,824 | 18,288
Net portfolio income (loss) | 4,958 | (7,042)
Acquisition of MalinJ1 | 24,476 | 16,376
Operating loss | (19,518) | (23,418)
Other income (expense): |  |
Change in fair value of investment, net (Note 6) | 5,474 | 9,899
Gain (loss) on sale of investment (Note 6) | 8,187 | (9,230)
Impairment of other investment | 0 | (8,195)
Gain on disposal of other investment | 0 | 2,000
Change in fair value of the Series A and B warrants and embedded derivatives | (58,238) | 4,518
Gain on sale of prepaid investment and derivative | 2,845 | 0
Change in fair value of trading securities and equity securities | 176,173 | (145)
Gain on sale of trading securities | 7,352 | 2,188
Loss on foreign currency exchange | (4,905) | (2)
Interest expense on Senior Secured Notes | (5,923) | 0
Interest income and other | 838 | 3,432
Total other income | 131,803 | 4,465
Income (loss) before income taxes | 112,285 | (18,953)
Income tax benefit | 1,159 | 1,824
Net income (loss) including noncontrolling interests in subsidiaries | 113,444 | (17,129)
Net loss attributable to noncontrolling interests in subsidiaries | 0 | 14
Net income (loss) attributable to Acacia Research Corporation | 113,444 | (17,115)
Net income (loss) attributable to common stockholders - basic | $ 90,330 | $ (17,422)
Basic net income (loss) per common share | $ 1.85 | $ (0.35)
Weighted average number of shares outstanding - basic | 48,840,829 | 49,764,002
Net income (loss) attributable to common stockholders - diluted | $ 88,471 | $ (20,373)
Diluted net income (loss) per common share | $ 1.54 | $ (0.40)
Weighted average number of shares outstanding - diluted | 57,435,128 | 50,896,773

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