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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

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