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Debt (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 9 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 15, 2018 | Mar. 08, 2018 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020 | Feb. 27, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Apr. 30, 2018
Debt |  |  |  |  |  |  |  |  |  |
Gain (loss) on debt extinguishment |  |  |  | $ 443 | $ (129) |  |  |  |  |
Convertible Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Debt issuance costs |  |  |  |  |  |  | $ 205 |  |  |
Original Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum amount of debt agreed to be issued |  | $ 5,000 |  |  |  |  |  |  |  |
Interest rate (as a percent) | 8.00% | 4.00% |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  |  | $ 2,965 | $ 2,965
Gross proceeds threshold |  | $ 10,000 |  |  |  |  |  |  |  |
Stock price trigger percentage | 80.00% | 90.00% |  |  |  |  |  |  |  |
Multiplier applied on principal plus accrued and unpaid interest | 2 |  |  |  |  |  |  |  |  |
Principal amount holder to be included to provide consent | $ 1,000 |  |  |  |  |  |  |  |  |
Percentage of Note holders to provide consent to make amendments or waivers | 66.667% |  |  |  |  |  |  |  |  |
Original Notes | Class B-1 preferred stock |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Conversion price |  | $ 1.385 |  |  |  |  |  |  |  |
Percentage of voting power |  | 50.00% |  |  |  |  |  |  |  |
Additional Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum amount of debt agreed to be issued | $ 8,000 |  |  |  |  |  |  |  |  |
Principal amount |  |  |  |  |  |  |  | $ 4,661 |  |
Second Amendment Notes |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |
Maximum amount of debt agreed to be issued |  |  |  |  |  |  | $ 10,035 |  |  |
Principal amount |  |  |  |  |  | $ 5,372 |  |  |  |
Gain (loss) on debt extinguishment |  |  | $ 0 |  | $ 129 |  |  |  |  |

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