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Fair Value Measurements - Narrative (Details) |  |  |  | 1 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Dec. 13, 2023 USD ($) | Dec. 06, 2023 USD ($) shares | Nov. 13, 2023 shares | Feb. 11, 2024 USD ($) | Jun. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Jun. 28, 2024 USD ($) | Jun. 30, 2020 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Fair value, measurement with unobservable inputs reconciliation, recurring basis, liability, transfers, net |  |  |  |  | $ 0 | $ 0 |  |
Fair value, measurement with unobservable inputs reconciliation, recurring basis, asset, transfers, net |  |  |  |  | $ 0 | $ 0 |  |
Obligation to issue stock (in shares) | shares |  |  | 148,710.488 |  |  |  |  |
2023 Securities Purchase Agreement |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | shares |  |  | 149,330.115 |  |  |  |  |
Issuance of stock for settlement of liability | $ 14,800,000 |  |  | $ 35,200,000 |  |  |  |
SOBI | License |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Contract liability |  |  |  |  |  |  | $ 30,000,000 | $ 75,000,000
Old Cartesian |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Contingent value right, percentage of milestone payments, royalties and other amounts to be distributed |  | 100.00% |  |  | 100.00% |  |  |
Fixed semi annual amount |  | $ 750,000 |  |  |  |  |  |
Old Cartesian | 2022 Warrants | Contingent Value Right |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Class of warrant or right, number of securities called by each warrant or right (in shares) | shares |  | 30 |  |  |  |  |  |
Dividend yield | Valuation technique, option pricing model |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  |  |  |  | 0 |  |  |
Dividend yield | Valuation technique, option pricing model | 2022 Warrants |  |  |  |  |  |  |  |
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Warrants and rights outstanding, measurement input |  |  |  |  | 0 | 0 |  |

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