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Accrued Expenses (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Dec. 31, 2021
Accrued Expense [Abstract]    
Registration penalties $ 2,083 $ 1,950
License fees 893 893
Board of director's fees 537 507
Related party 250 0
Other 1,153 1,044
Total accrued expenses 4,916 $ 4,394
Warranty reserve accrual $ 0