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Details of Certain Financial Statement Components - Accrued liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Accrued liabilities    
Accrued wages and benefits $ 204 $ 320
Accrued vacation 185 223
Accrued other liabilities 103 25
Total accrued liabilities $ 492 $ 568