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UNAUDITED CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Income Statement [Abstract]    
Revenues $ 5,803 $ 3,815
Patent portfolio operations:    
Inventor royalties 95 426
Contingent legal fees 1,094 234
Litigation and licensing expenses - patents 2,262 1,037
Amortization of patents 1,862 1,043
Other patent portfolio expenses (income) 0 (234)
Patent portfolio expenses 5,313 2,506
Net patent portfolio income 490 1,309
General and administrative expenses 6,166 4,878
Operating loss (5,676) (3,569)
Other income (expense):    
Change in fair value of investment, net 0 4,108
Gain (loss) on sale of investment 839 (3,316)
Change in fair value of the Series A and B warrants and embedded derivatives (198,909) (4,382)
Change in fair value of equity securities 37,849 (6,117)
Gain on sale of equity securities 819 112
Earnings on equity investment in joint venture 2,730 0
Loss on foreign currency exchange (24) 0
Interest expense on Senior Secured Notes (1,310) 0
Interest (expense) income and other (26) 535
Total other expense (158,032) (9,060)
Loss before income taxes (163,708) (12,629)
Income tax benefit (expense) (10) 1,338
Net Loss including noncontrolling interests in subsidiaries (163,718) (11,291)
Net Income attributable to noncontrolling interests in subsidiaries (900) 0
Net Loss attributable to Acacia Research Corporation $ (164,618) $ (11,291)
Net Loss attributable to common stockholders - basic and diluted $ (136,665) $ (12,185)
Basic and diluted net loss per common share $ (2.81) $ (0.24)
Weighted average number of shares outstanding - basic and diluted 48,596,040 49,875,396