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Debt - Summary of Future Principal Payments (Details) - SVB and WestRiver
$ in Thousands
Sep. 30, 2021
USD ($)
Debt Instrument [Line Items]  
2021 (remaining three months) $ 1,364
2022 5,455
2023 1,363
Thereafter 0
Total principal payments 8,182
Less unamortized loan fees (65)
Total term loan borrowings $ 8,117