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Stock Based Compensation - Other Stock-Based Compensation (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 23,757 | $ 1,237 | $ 6,680
General and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 13,142 | 945 | 6,205
Research and development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | 6,110 | 181 | 361
Sales and marketing |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense | $ 4,505 | 111 | $ 114
Class B common stock |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Total stock-based compensation expense |  | $ 500 |

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