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Details of Certain Financial Statement Components - Accrued liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued liabilities    
Accrued warranty $ 7 $ 7
Accrued wages and benefits 165 180
Accrued vacation 79 110
Accrued other 49 46
Total accrued liabilities $ 300 $ 343