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DETAILS OF CERTAIN FINANCIAL STATEMENT COMPONENTS - Accrued liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Accrued liabilities      
Accrued warranty $ 7   $ 7
Accrued wages and benefits 138   180
Accrued vacation 103   110
Accrued other 47   46
Total accrued liabilities $ 295 $ 343 $ 343