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Stock-Based Compensation - Stock Based Compensation Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | $ 70,844 | $ 10,124 | $ 9,889
Secondary Market |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 791 | 3,456 | 6,162
Cost of revenue |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 753 | 79 | 46
Research and development |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 13,184 | 4,250 | 3,431
Research and development | Secondary Market |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 325 | 1,524 | 1,694
Sales and marketing |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 7,167 | 3,675 | 966
Sales and marketing | Secondary Market |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 300 | 1,607 | 96
General and administrative |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | 49,740 | 2,120 | 5,446
General and administrative | Secondary Market |  |  |
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |  |
Stock based compensation expense | $ 166 | $ 325 | $ 4,372

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