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Accrued Expenses and Other Current Liabilities - Schedule of Accrued Expenses and Other Current Liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2024 | Dec. 31, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Payables and Accruals [Abstract] |  |  |
Employee compensation costs | $ 1,264 | $ 987 |
Restructuring costs | 820 | 1,734 | $ 0
Contract research and development costs | 118 | 685 |
Operating lease liabilities, current | $ 77 | $ 183 |
Operating Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Accrued Liabilities and Other Liabilities | Accrued Liabilities and Other Liabilities |
Other liabilities | $ 706 | $ 539 |
Total accrued expenses and other current liabilities | $ 2,985 | $ 4,128 |

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