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Debt - Summary of Future Principal Payments (Details) - SVB and WestRiver
$ in Thousands
Sep. 30, 2020
USD ($)
Debt Instrument [Line Items]  
2020 (remaining three months) $ 1,364
2021 5,455
2022 5,455
2023 1,363
Thereafter 0
Total principal payments 13,637
Less unamortized loan fees (179)
Total term loan borrowings $ 13,458