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Description of Business and Summary of Significant Accounting Policies - Other income (expense), net (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Description of Business and Summary of Significant Accounting Policies |  |  |  |
Loss on remeasurement of debt (Note 3) |  | $ (454) |  |
Loss on remeasurement of legacy preferred stock warrant liability |  | (1,079) |  |
Loss on extinguishment of debt, net |  | (247) | $ 5,748 | $ (483)
Other, net | $ 83 |  |  | 30
Other, net |  | (94) | (274) |
Other income (expense), net | $ 83 | $ (1,874) | 1,244 | (7,967)
Gain on settlement of accounts payable |  |  | $ 796 | $ 735

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