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Accrued Expenses (Details 1) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Beginning balance $ 33 $ 37
Accrual for warranties 12 33
Adjustments related to pre-existing warranties   (10)
Warranty settlements (15) (27)
Ending balance $ 30 $ 33