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Stock-Based Compensation - Schedule of stock-based Compensation by Plan (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Dec. 31, 2020 | Mar. 31, 2021 | Mar. 31, 2020 | Dec. 31, 2020 | Dec. 31, 2019
Stock-Based Compensation |  |  |  |  |
Stock based compensation expense |  | $ 16,835 | $ 672 | $ 11,296 | $ 35,972
Secondary market transaction |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Stock based compensation expense | $ 1,616 | 1,933 |  | 1,616 | 33,232
Employee earnout restricted stock |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Stock based compensation expense |  | 12,373 |  |  |
Employee awards |  |  |  |  |
Stock-Based Compensation |  |  |  |  |
Stock based compensation expense |  | $ 2,529 | $ 672 | $ 9,680 | $ 2,740

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