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2. Basic and Diluted Loss Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2019
Dec. 31, 2018
Basic Numerator:                    
Net loss attributable to Acacia Research Corporation $ 634 $ (7,608) $ (5,757) $ (4,384) $ (11,369) $ (33,195) $ (28,427) $ (32,038) $ (17,115) $ (105,029)
Accretion of Series A Redeemable Convertible Preferred Stock                 (307) 0
Net loss attributable to common stockholders - basic $ 327 $ (7,608) $ (5,757) $ (4,384) $ (11,369) $ (33,195) $ (28,427) $ (32,038) $ (17,422) $ (105,029)
Basic Denominator:                    
Weighted-average shares used in computing net loss per share attributable to common stockholders - basic 49,875,750 49,828,361 49,696,016 49,655,881 49,639,172 49,557,748 50,061,812 50,632,958 49,764,002 49,969,062
Basic net loss per share of common stock $ 0.01 $ (0.15) $ (0.12) $ (0.09) $ (0.23) $ (0.67) $ (0.57) $ (0.63) $ (0.35) $ (2.10)
Diluted Numerator:                    
Net loss attributable to Acacia Research Corporation $ 634 $ (7,608) $ (5,757) $ (4,384) $ (11,369) $ (33,195) $ (28,427) $ (32,038) $ (17,115) $ (105,029)
Mark-to-market adjustment for preferred stock embedded derivative (3,258) 0 0 0 0 0 0 0 (3,258) 0
Net loss attributable to common stockholders - diluted $ (2,624) $ (7,608) $ (5,757) $ (4,384) $ (11,369) $ (33,195) $ (28,427) $ (32,038) $ (20,373) $ (105,029)
Diluted Denominator:                    
Weighted-average shares used in computing net loss per share attributable to common stockholders - basic 49,875,750 49,828,361 49,696,016 49,655,881 49,639,172 49,557,748 50,061,812 50,632,958 49,764,002 49,969,062
Effect of potentially dilutive securities: Series A preferred stock                 1,132,771 0
Weighted-average shares used in computing net loss per share attributable to common stockholders - diluted 54,406,835 49,828,361 49,696,016 49,655,881 49,639,172 49,557,748 50,061,812 50,632,958 50,896,773 49,969,062
Diluted net loss per share of common stock $ (0.05) $ (0.15) $ (0.12) $ (0.09) $ (0.23) $ (0.67) $ (0.57) $ (0.63) $ (0.40) $ (2.10)