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Details of Certain Financial Statement Components - Accrued liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Accrued liabilities    
Accrued wages and benefits $ 146 $ 204
Accrued vacation 190 185
Other accrued liabilities 80 103
Total accrued liabilities $ 416 $ 492