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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Accrued Expenses      
Warranty $ 1,779 $ 1,606 $ 1,443
In-transit inventory 985 882  
Legal and consulting 1,341 634  
Travel 552 545  
Clinical studies 109 193  
Sales and use tax 135 67  
Other 449 496  
Total $ 5,350 $ 4,423