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Stockholders' Equity - Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 24,512 | $ 21,529 | $ 76,157 | $ 59,409
Share-based compensation expense capitalized | 600 |  | 1,800 |
Cost of revenues |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 393 | 262 | 1,174 | 644
Research and development |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 8,917 | 8,433 | 25,976 | 23,044
Sales and marketing |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 3,051 | 2,431 | 9,625 | 7,053
General and administrative |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 12,151 | $ 10,403 | $ 39,382 | $ 28,668

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