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Stock-Based Compensation - Stock-based compensation expense (Details) - USD ($) shares in Thousands, $ in Thousands | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based payment arrangements information |  |  |
Total stock-based compensation expense | $ 21,887 | $ 20,527 | $ 1,680
Noncash stock-based compensation expense | 21,887 | 5,984 | 1,680
Cash-based compensation expense |  | $ 14,543 |
Performance and Market Based Options |  |  |
Share-based payment arrangements information |  |  |
Total stock-based compensation expense | $ 2,100 |  |
Repurchased and cancelled shares | 956 | 956 |
Cost of Revenue |  |  |
Share-based payment arrangements information |  |  |
Total stock-based compensation expense |  |  | 8
Product development |  |  |
Share-based payment arrangements information |  |  |
Total stock-based compensation expense | $ 4,369 | $ 673 | 305
Sales, marketing and customer support |  |  |
Share-based payment arrangements information |  |  |
Total stock-based compensation expense | 6,375 | 6,151 | 450
General and administrative |  |  |
Share-based payment arrangements information |  |  |
Total stock-based compensation expense | $ 11,143 | 13,703 | $ 917
General and administrative | Restricted Stock Units (RSUs) |  |  |
Share-based payment arrangements information |  |  |
Total stock-based compensation expense |  | $ 700 |

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