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Details of Certain Financial Statement Components - Accrued liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accrued liabilities    
Accrued warranty $ 3 $ 7
Accrued wages and benefits 402 180
Accrued vacation 82 110
Accrued other 20 20
Total accrued liabilities $ 507 $ 343