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Accrued Expenses (Details 1) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Accrued Expenses    
Beginning Balance $ 50 $ 33
Accrual For Warranties 11 50
Adjustments Related To Pre-existing Warranties   1
Warranty Settlements (10) (34)
Ending Balance $ 51 $ 50