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Accrued Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2021
Dec. 31, 2020
Accrued Expense [Abstract]      
Outside services $ 135 $ 135 $ 347
License fees 893 893 336
Board of director's fees 477 477 320
Registration penalties 1,950 1,950 264
Commissions 0 0 239
Legal and professional fees 110 110 197
Warranty reserve 180 180 180
Inventory purchases 122 122 91
Other 311 311 153
Total accrued expenses 4,178 4,178 $ 2,127
Warranty reserve accrual $ 0 $ 0