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Debt - 2019 Convertible Promissory Notes (Details) - USD ($) $ in Thousands |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 23, 2020 | Dec. 23, 2019 | Jul. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 30, 2020 | Dec. 19, 2019
Debt |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  | $ 3,000
Interest rate (stated) |  |  |  |  |  |  | 3.00%
Original debt amount |  |  |  | $ 1,436 | $ 34,105 |  |
2019 Convertible Promissory Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Amount borrowed |  |  |  |  | $ 21,600 |  |
Interest rate (stated) |  |  |  |  | 10.00% |  |
PIK Interest |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Interest rate (stated) |  |  |  |  | 10.00% |  |
FVO notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Amount borrowed |  |  |  | 5,500 |  | $ 3,000 |
Fair value |  |  |  | $ 0 |  |  |
Percentage of outstanding principal and unpaid interest amount payment upon maturity |  |  |  | 200.00% |  |  |
Unpaid interest | $ 5,974 |  |  |  |  |  |
Debt repayment term |  |  | 1 year |  |  |  |
Series C Redeemable Convertible Preferred Stock |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Fair value |  |  |  | $ 4,233 |  |  |
Unpaid interest | $ 1,000 |  |  |  |  |  |
Series C Redeemable Convertible Preferred Stock | 2019 Convertible Promissory Notes |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Original debt amount |  | $ 16,100 |  |  |  |  |
Series C Redeemable Convertible Preferred Stock | PIK Interest |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |
Original debt amount |  | $ 971 |  |  |  |  |

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