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Accrued Expenses (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Accrued Expenses    
Accrued wages and benefits $ 2,066 $ 513
Accrued accounts payable 691 505
Accrued sales and telecommunications taxes 2,576 438
Product warranty liability 30 33
Other accrued expenses 92 139
Total accrued expenses $ 5,455 $ 1,628