| Document and Entity Information | Nov. 12, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Nov. 12, 2024 |
| Entity Registrant Name | ADEIA INC. |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-39304 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Common Stock (par value $0.001 per share) |
| Trading Symbol | ADEA |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
| Amendment Flag | false |
| Entity Central Index Key | 0001803696 |
