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3. Loss Per Share (Tables)
3 Months Ended
Mar. 31, 2020
Earnings Per Share [Abstract]  
Calculation of basic and diluted net loss per share
   Three Months Ended 
   March 31, 
   2020   2019 
   (In thousands, except share and per share information) 
         
Numerator:          
Net loss attributable to Acacia Research Corporation   (11,291)   (4,384)
Dividend on Series A redeemable convertible preferred stock   (263)    
Accretion of Series A redeemable convertible preferred stock   (631)    
Net loss attributable to common stockholders - basic and diluted   (12,185)   (4,384)
           
Denominator:          
Weighted-average shares used in computing net loss per share attributable to common stockholders - basic and diluted   49,875,396    49,655,881 
Basic and diluted net loss per common share  $(0.24)  $(0.09)