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Significant Agreements – Related Parties (Details) - USD ($) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 24, 2020 | Jul. 23, 2019 | Sep. 30, 2021 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2022 | Dec. 31, 2023
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Research and development |  |  |  | $ 15,900,000 | $ 6,900,000 | $ 43,700,000 | $ 20,100,000 |  |
Current liabilities |  |  |  | 14,481,000 |  | 14,481,000 |  |  | $ 15,085,000
Prepaid expenses and other assets |  |  |  | 756,000 |  | 756,000 |  |  | 633,000
Other assets |  |  |  | 2,115,000 |  | 2,115,000 |  |  | 2,094,000
Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Research and development |  |  |  | 2,310,000 | 2,271,000 | 7,400,000 | 6,511,000 |  |
Accrued expenses and other current liabilities |  |  |  | 1,801,000 |  | 1,801,000 |  |  | 3,561,000
Accounts payable |  |  |  | 431,000 |  | 431,000 |  |  | 1,044,000
Master Services Agreement | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Research and development |  |  |  | 0 | 0 | 0 | 0 |  |
Accrued expenses and other current liabilities |  |  |  | 0.0 |  | 0.0 |  |  | 1,600,000
BBL Agreements | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Research and development |  |  |  | 700,000 | 300,000 | 1,100,000 | 700,000 |  |
Accrued expenses and other current liabilities |  |  |  | 1,100,000 |  | 1,100,000 |  |  | 1,700,000
Related party agreement, term |  | 5 years |  |  |  |  |  |  |
Syngene Agreement, Manufacturing | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party agreement, term |  | 6 years |  |  |  |  |  |  |
Syngene Agreement, Master Contract Services | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Related party agreement, term | 2 years |  |  |  |  |  |  |  |
Syngene Agreements | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Research and development |  |  |  | 2,000,000.0 | $ 1,600,000 | 6,300,000 | $ 5,800,000 |  |
Accrued expenses and other current liabilities |  |  |  | 800,000 |  | 800,000 |  |  | 1,900,000
Current liabilities |  |  |  | 1,200,000 |  | 1,200,000 |  |  | 2,900,000
Accounts payable |  |  |  | $ 400,000 |  | $ 400,000 |  |  | 1,000,000.0
Biofusion Agreement | Related Party |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Research and development |  |  |  |  |  |  |  | $ 4,100,000 |
Accrued expenses and other current liabilities |  |  |  |  |  |  |  | $ 7,700,000 |
Promissory Note | Chief Financial Officer |  |  |  |  |  |  |  |  |
Related Party Transaction [Line Items] |  |  |  |  |  |  |  |  |
Promissory note loan amount |  |  | $ 274,000 |  |  |  |  |  |
Interest rate |  |  | 0.86% |  |  |  |  |  |
Number of shares pledged as collateral (in shares) |  |  | 616,320 |  |  |  |  |  |
Prepaid expenses and other assets |  |  |  |  |  |  |  |  | 68,000
Other assets |  |  |  |  |  |  |  |  | $ 68,000

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