| Document And Entity Information | Jul. 19, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Jul. 19, 2024 |
| Entity Registrant Name | Peak Bio, Inc. |
| Entity Central Index Key | 0001834645 |
| Entity Emerging Growth Company | true |
| Entity File Number | 001-39951 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 85-2448157 |
| Entity Address, Address Line One | 4900 Hopyard Road |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Pleasanton |
| Entity Address, State or Province | CA |
| Entity Address, Postal Zip Code | 94588 |
| City Area Code | 925 |
| Local Phone Number | 463-4800 |
| Entity Information, Former Legal or Registered Name | N/A |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Ex Transition Period | false |
| Title of 12(b) Security | Common Stock, par value $0.0001 per share |
| Trading Symbol | PKBO |
| Security Exchange Name | NONE |
