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Stock-Based Compensation - Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | $ 14,894 | $ 8,513 | $ 24,830 | $ 16,706
Research and development |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 2,040 | 1,851 | 3,623 | 3,751
Sales and marketing |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 2,944 | 2,032 | 5,680 | 3,996
General and administrative |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 9,109 | 3,800 | 13,870 | 7,363
Subscription and support | Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | 436 | 399 | 867 | 756
Professional services | Cost of revenue |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost [Line Items] |  |  |  |
Share-based compensation expense | $ 365 | $ 431 | $ 790 | $ 840

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