v3.26.3
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2026
Oct. 22, 2026
Cover [Abstract]    
Entity Registrant Name ADEIA INC.  
Trading Symbol ADEA  
Entity Central Index Key 0001803696  
Current Fiscal Year End Date --12-31  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Document Type 10-Q  
Document Period End Date Sep. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q3  
Amendment Flag false  
Entity Common Stock, Shares Outstanding   110,367,561
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Shell Company false  
Entity File Number 001-39304  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 84-4734590  
Entity Address, Address Line One 3025 Orchard Parkway  
Entity Address, City or Town San Jose  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 95134  
City Area Code 408  
Local Phone Number 473-2500  
Document Quarterly Report true  
Document Transition Report false  
Security12b Title Common Stock (par value $0.001 per share)  
Security Exchange Name NASDAQ