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Accrued Expenses (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued wages and benefits $ 698 $ 513
Accrued accounts payable 915 505
Accrued sales and telecommunications taxes 2,616 438
Product warranty liability 34 33
Other accrued expenses 88 139
Total accrued expenses $ 4,351 $ 1,628