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Accrued expenses and other current liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Accrued expenses and other current liabilities    
Accrued employee compensation and benefits expense $ 3,500 $ 3,083
Accrued vendor expenses 5,885 1,685
Accrued warranty expense 612 637
Accrued interest   330
Deferred rent, current portion 127 118
Accrued taxes 748 688
Other 694 113
Accrued expenses and other current liabilities $ 11,566 $ 6,654