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Accrued Expenses (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Accrued Expenses      
Warranty $ 1,610 $ 1,606 $ 1,358
Legal and consulting 373 882  
In-transit inventory 422 634  
Travel and business 314 545  
Sales and use tax 164 193  
Clinical studies 86 67  
Other 258 496  
Total $ 3,227 $ 4,423