Shareholders' Equity (Deficit) - Additional Information (Details) - USD ($)		1 Months Ended		3 Months Ended
	Nov. 14, 2024	Apr. 30, 2025	Mar. 31, 2025	Mar. 31, 2025	Mar. 31, 2024	Dec. 31, 2024
Class of Stock [Line Items]
Number of shares authorized			245,035,791,523	245,035,791,523		245,035,791,523
Net proceeds from sale of shares				$ 1,557,000	$ 1,726,000
Nominal value of ADS (in per warrant ADS)			$ 0.0001	$ 0.0001	$ 0.0001	$ 0.0001
ADSs issued amount				$ 2,242,000	$ 1,664,000
Capital redemption reserve			$ 52,194,000	$ 52,194,000		$ 52,194,000
Ordinary Shares | Peak Bio
Class of Stock [Line Items]
Share issued	25,227,884,000
ADS | Ordinary Shares
Class of Stock [Line Items]
Number of ordinary shares representing one ADS			2,000	2,000
Private Placement
Class of Stock [Line Items]
Price per share			$ 0.87
Purchase price of share			0.67
Description of units				The Units consist of (i) for investors committing less than $1.0 million in cash in the March 2025 Offering (“Tier 1 Investors”) one ADS or Pre-Funded Warrant plus a Series A Warrant to purchase one ADS and a Series B Warrant to purchase one ADS, (ii) for investors committing at least $1.0 million, but less than $3.0 million in the March 2025 Offering (“Tier 2 Investors”) one ADS or Pre-Funded Warrant plus a Series A Warrant to purchase 1.25 ADSs and a Series B Warrant to purchase one ADS, and (iii) for investors committing $3.0 million or more in the March 2025 Offering (“Tier 3 Investors”), one ADS or Pre-Funded Warrant plus a Series A Warrant to purchase 1.5 ADSs and a Series B Warrant to purchase one ADS. The purchase price per Unit for investors purchasing ADSs is equal to $0.87 plus (a) $0.25 for Tier 1 Investors, (b) $0.28125 for Tier 2 Investors, or (c) $0.3125 for Tier 3 Investors (the “ADS Unit Purchase Price”).
Private Placement | Tier 1 Investors
Class of Stock [Line Items]
Price per share			0.25
Private Placement | Tier 2 Investors
Class of Stock [Line Items]
Price per share			0.28125
Private Placement | Tier 3 Investors
Class of Stock [Line Items]
Price per share			$ 0.3125
Number of ADS			1
Private Placement | 2021 Notes
Class of Stock [Line Items]
Notes cancelled, extinguished				$ 1,000,000
Private Placement | Maximum | Tier 1 Investors
Class of Stock [Line Items]
Investors committing amount			$ 1,000,000	1,000,000
Private Placement | Minimum | Tier 3 Investors
Class of Stock [Line Items]
Investors committing amount			$ 3,000,000	$ 3,000,000
Private Placement | Ordinary Shares
Class of Stock [Line Items]
Number of ordinary shares representing one ADS			2,000	2,000
Private Placement | Series A warrants | Tier 3 Investors
Class of Stock [Line Items]
Warrants issued to purchase ADS (in shares)			1.5	1.5
Private Placement | Series B warrants | Tier 3 Investors
Class of Stock [Line Items]
Number of ADS			1
Private Placement | Pre-Funded Warrants
Class of Stock [Line Items]
Exercise price of warrants			$ 0.2	$ 0.2
Private Placement | Pre-Funded Warrants | Tier 1 Investors
Class of Stock [Line Items]
Purchase price of share			0.25
Private Placement | Pre-Funded Warrants | Tier 2 Investors
Class of Stock [Line Items]
Purchase price of share			0.28125
Private Placement | Pre-Funded Warrants | Tier 3 Investors
Class of Stock [Line Items]
Purchase price of share			$ 0.3125
Private Placement | ADS
Class of Stock [Line Items]
Aggregate ADSs issued (in shares)			6,637,626
Net proceeds from sale of shares				$ 1,000,000
Aggregate gross proceeds				$ 6,600,000
Number of ADS			1
Payment percentage to placement agent				3.00%
Private Placement | ADS | Subsequent Event
Class of Stock [Line Items]
Net proceeds from sale of shares		$ 4,000,000
Private Placement | ADS | Maximum
Class of Stock [Line Items]
Investors committing amount			$ 3,000,000	$ 3,000,000
Private Placement | ADS | Minimum
Class of Stock [Line Items]
Investors committing amount			$ 1,000,000	1,000,000
Private Placement | ADS | Dr. Hoyoung Huh
Class of Stock [Line Items]
ADSs issued amount				$ 1,000,000
Private Placement | ADS | Series A warrants
Class of Stock [Line Items]
Warrants issued to purchase ADS (in shares)			1.25	1.25
Private Placement | ADS | Series B warrants
Class of Stock [Line Items]
Warrants issued to purchase ADS (in shares)			1	1
American Depositary Shares | November 2022 Peak Bio Warrants | Peak Bio
Class of Stock [Line Items]
Aggregate ADSs issued (in shares)	1,577,566
Price per share				$ 39.18
American Depositary Shares | April 2023 Peak Bio Warrants | Peak Bio
Class of Stock [Line Items]
Aggregate ADSs issued (in shares)	1,187,013
Price per share				$ 2.04