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Description of Business and Basis of Financial Statements (Details) $ in Thousands | 99 Months Ended |  |  |  |
--- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) lease | May 01, 2024 employee | Dec. 31, 2023 USD ($) | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Subsequent Event [Line Items] |  |  |  |  |
Number of development programs | lease | 3 |  |  |  |
Accumulated deficit | $ (440,476) |  | $ (410,892) |  |
Proceeds from issuance of private placement | 430,900 |  |  |  |
Cash, cash equivalents and restricted cash | $ 97,312 |  | $ 46,674 | $ 92,761 | $ 106,745
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Number of employees | employee |  | 80 |  |  |

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