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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Accrued Expenses    
Employee compensation, benefits, and related accruals $ 1,146 $ 1,285
Research and development costs   250
Income taxes payable 125  
Professional fees 110 216
Other accrued 2  
Total $ 1,383 $ 1,751