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v3.25.1

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 |  |

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