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Accrued Expenses (Details 1) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Beginning balance $ 33 $ 37
Accrual for warranties 27 33
Adjustments related to pre-existing warranties   (10)
Warranty settlements (26) (27)
Ending balance $ 34 $ 33