Cover Page - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Aug. 05, 2024	Jun. 30, 2023
Document Information Line Items
Entity Registrant Name	Peak Bio, Inc.
Document Type	10-K
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		23,124,888
Amendment Flag	false
Entity Central Index Key	0001834645
Entity Current Reporting Status	No
Document Annual Report	true
Entity Filer Category	Non-accelerated Filer
Document Period End Date	Dec. 31, 2023
Document Fiscal Year Focus	2023
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Shell Company	false
Entity Ex Transition Period	false
ICFR Auditor Attestation Flag	false
Document Transition Report	false
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, 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 Well Known Seasoned Issuer	No
Entity Voluntary Filers	No
Title of 12(g) Security	Common Stock, $0.0001, par value
Entity Interactive Data Current	No
Entity Public Float			$ 17
Document Financial Statement Error Correction [Flag]	false
Auditor Name	Marcum llp
Auditor Location	New York, NY
Auditor Firm ID	688