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Selected Balance Sheet Information - Schedule of Accrued employee benefits (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Selected Balance Sheet Information    
Accrued bonus expense $ 325 $ 1,216
Accrued vacation expense 142 100
Accrued compensation expense 182 87
Total $ 649 $ 1,403