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Stock-Based Compensation - Stock Option Activity (Details) - 2014 Equity Incentive Plan, 2023 Equity Incentive Plan and Peak Bio 2022 Long Term Incentive Plan - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Number of shares, Options Outstanding at beginning of the period | 3,963,964,688 |  |
Number of shares, Granted | 10,452,672,000 |  |
Number of shares, Forfeited | (26,350,000) |  |
Number of shares, Options Outstanding at end of the period | 14,390,286,688 |  | 3,963,964,688
Number of shares, Exercisable options at end of the period | 1,604,153,355 |  |
Weighted average exercise price, Outstanding at beginning of the period | $ 0.01 |  |
Weighted average exercise price, Forfeited | 0.03 |  |
Weighted average exercise price, Outstanding at end of the period |  |  | $ 0.01
Options exercisable at end of the period, Weighted average exercise price | $ 0.01 |  |
Weighted average remaining contractual life, Options outstanding during the period (in years) | 9 years 3 months 18 days |  | 7 years 6 months
Weighted average remaining contractual term, Options exercisable at end of the period (in years) | 4 years 3 months 18 days |  |
Aggregate intrinsic value, Options outstanding at end of the period | $ 1 |  |
Aggregate intrinsic value, Options exercisable at end of the period | $ 1 |  |
Maximum |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |
Weighted-average grant-date fair value per share of options granted | $ 0.01 | $ 0.01 |

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