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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Accrued Expenses    
Employee compensation, benefits, and related accruals $ 480 $ 870
Research and development costs 1,401 900
Legal reserves, professional fees, and other accruals 234 324
Total $ 2,115 $ 2,094