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Stock-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Payment Arrangement, Additional Disclosure [Abstract] |  |  |  |
Stock-based compensation expense | $ 7,147 | $ 3,071 | $ 18,698 | $ 8,661
Cost of services |  |  |  |
Share-based Payment Arrangement, Additional Disclosure [Abstract] |  |  |  |
Stock-based compensation expense | 1,536 | 818 | 4,284 | 1,970
Selling and marketing |  |  |  |
Share-based Payment Arrangement, Additional Disclosure [Abstract] |  |  |  |
Stock-based compensation expense | 917 | 351 | 2,396 | 1,475
General and administrative |  |  |  |
Share-based Payment Arrangement, Additional Disclosure [Abstract] |  |  |  |
Stock-based compensation expense | $ 4,694 | $ 1,902 | $ 12,018 | $ 5,216

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