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Selected Balance Sheet Information - Schedule of Accrued employee benefits (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Selected Balance Sheet Information    
Accrued bonus expense $ 1,307 $ 1,216
Accrued compensation expense 127 87
Accrued vacation expense 83 100
Total accrued employee benefits $ 1,517 $ 1,403