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Basis of Presentation and Summary of Significant Accounting Policies - Additional Information (Details) | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2024 USD ($) | Jul. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) | Sep. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) | Mar. 31, 2024 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($) | Mar. 31, 2023 USD ($) | Sep. 30, 2024 USD ($) Segment | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Net loss |  |  |  |  | $ 12,747,000 | $ 14,435,000 | $ 16,617,000 | $ 16,707,000 | $ 15,804,000 | $ 15,323,000 | $ 43,800,000 | $ 47,800,000 |
Cash flows used in operating activities |  |  |  |  |  |  |  |  |  |  | 43,984,000 | 36,220,000 |
Accumulated deficit | $ 198,254,000 |  |  |  | 198,254,000 |  |  |  |  |  | 198,254,000 |  | $ 154,455,000
Cash cash equivalents and investments | 93,400,000 |  |  |  | 93,400,000 |  |  |  |  |  | $ 93,400,000 |  |
Number of operating segments | Segment |  |  |  |  |  |  |  |  |  |  | 1 |  |
Number of reportable Segments | Segment |  |  |  |  |  |  |  |  |  |  | 1 |  |
Assumed dividend yield |  |  |  |  |  |  |  |  |  |  | $ 0 |  |
Cash and cash equivalents | 33,504,000 |  |  |  | 33,504,000 |  |  |  |  |  | 33,504,000 |  | 15,647,000
Investments | 59,900,000 |  |  |  | $ 59,900,000 |  |  |  |  |  | 59,900,000 |  | $ 118,800,000
Maximum amount eligible to receive under cost-reimbursement contract award |  |  |  | $ 17,800,000 |  |  |  |  |  |  |  |  |
Net unrealized gain (loss) on available-for-sale investments |  |  |  |  |  |  |  |  |  |  | $ (200,000) | $ 300,000 |
UGARF |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Grant award amount |  | $ 200,000 |  | $ 1,400,000 |  |  |  |  |  |  |  |  |
BMGF |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Grant award amount | $ 2,000,000 |  | $ 1,800,000 |  |  |  |  |  |  |  |  |  |

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