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Details of Certain Financial Statement Components - Accured liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accrued liabilities    
Accrued warranty $ 7 $ 9
Accrued wages and benefits 180 168
Accrued taxes, other than income taxes   3
Accrued vacation 110 83
Accrued other 46 39
Total accrued liabilities $ 343 $ 302