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Prepaid Expenses and other assets (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | --- | ---
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract] |  |  |
Research and development | $ 0 | $ 1,715 | $ 278
Collaboration receivable (Note 10) | 0 | 2,864 |
Other receivables | 579 | 0 |
Deposits | 0 | 925 | 891
Insurance | 1,628 | 340 | 402
Other | 78 | 72 | 1,295
Prepaid expenses and other assets | $ 2,285 | $ 5,916 | $ 2,866

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