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Debt - Promissory Notes (Details) - USD ($) $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 12, 2021 | Dec. 23, 2020 | Jul. 23, 2020 | Dec. 19, 2019 | Mar. 14, 2017 | Dec. 31, 2020 | Oct. 31, 2020 | Jul. 31, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019 | Mar. 31, 2021 | Nov. 01, 2018
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |  |
Interest rate (stated) |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |
Current portion of long-term debt (includes $0 and $11,659 at fair value, respectively) |  |  |  |  |  | $ 4,746 |  |  |  |  | $ 4,746 | $ 20,461 | $ 7,480 |
Warrants issued on conversion |  |  |  | 403,101 |  |  |  |  |  |  |  |  |  |
Interest rate on the event of default |  |  |  | 25.00% |  |  |  |  |  |  |  |  |  |
Proceeds from debt issuance, net of fees |  |  |  | $ 3,000 |  |  |  |  |  | $ 1,940 | 66,190 | 31,300 |  |
Amount outstanding |  |  |  |  |  | 47,983 |  |  |  |  | 47,983 | 49,461 | 50,104 |
Loans assumed |  |  | $ 398 |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  | 1.00% |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  | $ (247) | 5,748 | (483) |  |
Loan Proceeds Remain outstanding, Termination of Merger [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,100
Interest rate (stated) |  |  |  |  |  |  |  |  |  |  |  |  |  | 2.55%
Amount outstanding |  | $ 1,077 |  |  |  |  |  |  |  |  |  | 1,059 |  |
Unpaid interest |  | 4 |  |  |  |  |  |  |  |  |  |  |  |
Loan Proceeds Remain outstanding, Acceleration of Loan Due To Event of Default, Termination of Merger [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate on the event of default |  |  |  |  | 6.00% |  |  |  |  |  |  |  |  |
Proceeds from debt issuance, net of fees |  |  |  |  | $ 185 |  |  |  |  |  |  |  |  |
Amount outstanding |  | 185 |  |  |  |  |  |  |  |  |  | 185 |  |
Loss on extinguishment of debt |  | 0 |  |  |  |  |  |  |  |  |  |  |  |
Unpaid interest |  | 75 |  |  |  |  |  |  |  |  |  |  |  |
Paycheck Protection Program, Cares Act Loans [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest rate (stated) |  |  |  |  |  |  |  |  | 1.00% |  |  |  |  |
Proceeds from debt issuance, net of fees |  |  |  |  |  |  |  |  | $ 8,139 |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |
Amount outstanding |  |  |  |  |  | $ 8,139 |  |  |  |  | 8,139 |  | $ 8,317 |
Loans assumed | $ 2,026 |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate | 1.00% |  |  |  |  |  |  |  |  |  |  |  |  |
Twenty Twenty Promissory Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Variable interest rate |  |  |  |  |  | 12.00% |  |  |  |  |  |  |  |
Repayments of debt |  | 10,000 |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  | 12,063 |  |  |  |  |  |  |  |  |  |  |  |
Adjustments to additional |  | 564 |  |  |  |  |  |  |  |  |  |  |  |
Convertible debt with conversion feature |  | 5,772 |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | 5,047 |  |  |  |  |  |  |  |  |  |  |  |
Unpaid interest |  | 2,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest amount |  | 63 |  |  |  |  |  |  |  |  |  |  |  |
Loan Agreement With Cantor Fitzgerald Securities [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from debt issuance, net of fees |  |  |  |  |  |  | $ 5,000 | $ 10,000 |  |  |  |  |  |
Restricted cash |  |  |  |  |  |  | $ 5,000 |  |  |  |  |  |  |
Series C Redeemable Convertible Preferred Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Warrants grant date fair value |  |  |  |  |  | $ 300 |  |  |  |  | 300 |  |  |
Amount outstanding |  |  |  |  |  |  |  |  |  |  |  | $ 37 |  |
Repayments of debt |  | 3,381 |  |  |  |  |  |  |  |  |  |  |  |
Repayment of loan |  | 4,424 |  |  |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  |  |  |  |  |  |  |  |  |  | $ 2,532 |  |  |
Unpaid interest |  | 1,000 |  |  |  |  |  |  |  |  |  |  |  |
Interest amount |  | $ 43 |  |  |  |  |  |  |  |  |  |  |  |
Series C Redeemable Convertible Preferred Stock | Twenty Twenty Promissory Notes [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amount borrowed |  |  |  |  |  |  |  | $ 1,000 |  |  |  |  |  |
Warrants issued on conversion |  |  |  |  |  |  |  | 51,502 |  |  |  |  |  |
Debt instrument term |  |  |  |  |  |  |  | 1 year |  |  |  |  |  |

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