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Cover - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Mar. 11, 2024
Jun. 30, 2023
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2023    
Current Fiscal Year End Date --12-31    
Document Transition Report false    
Entity File Number 001-37721    
Entity Registrant Name ACACIA RESEARCH CORP    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 95-4405754    
Entity Address, Address Line One 767 Third Avenue,    
Entity Address, Address Line Two 6th Floor    
Entity Address, City or Town New York,    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 10017    
City Area Code 332    
Local Phone Number 236-8500    
Title of 12(b) Security Common Stock    
Trading Symbol ACTG    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 156,471
Entity Common Stock, Shares Outstanding   99,895,473  
Documents Incorporated by Reference
Portions of the registrant’s Definitive Proxy Statement on Schedule 14A for its 2024 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K. Such Definitive Proxy Statement will be filed with the Commission within 120 days after the end of the fiscal year covered by this Annual Report on Form 10-K. Only those portions of the proxy statement that are specifically incorporated by reference herein shall constitute a part of this Annual Report on Form 10-K.
    
Amendment Flag false    
Entity Central Index Key 0000934549    
Document Fiscal Year Focus 2023    
Document Fiscal Period Focus FY