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Stockholders' Equity - Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 19,546 | $ 15,452 | $ 37,880 | $ 30,490
Cost of revenues |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 213 | 74 | 382 | 199
Research and development |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 7,620 | 5,218 | 14,611 | 10,135
Sales and marketing |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 2,436 | 1,754 | 4,622 | 3,562
General and administrative |  |  |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 9,277 | $ 8,406 | $ 18,265 | $ 16,594

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