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Supplemental Balance Sheet Information, Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accrued Expenses [Abstract]    
Payroll $ 427 $ 753
Professional services 1,630 591
Research and development services and supplies 1,497 400
Other 95 71
Total $ 3,649 $ 1,815