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Details of Certain Financial Statement Components - Accrued liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2022
Dec. 31, 2021
Accrued liabilities    
Accrued compensation and benefits $ 219 $ 402
Accrued vacation 94 82
Other accrued liabilities 21 23
Total accrued liabilities $ 334 $ 507