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Share-based Compensation - Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 2,207 | $ 1,253 | $ 8,188 | $ 5,955
Cost of net revenues |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 308 | 202 | 1,296 | 899
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 491 | 183 | 2,292 | 1,315
Sales and marketing |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 531 | 307 | 1,810 | 1,339
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 877 | $ 561 | 2,790 | $ 2,402
Stock Options |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense | 13,600 |  | $ 13,600 |
Recognition period |  |  | 2 years 7 months 28 days |
RSUs |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense | $ 1,400 |  | $ 1,400 |
Recognition period |  |  | 1 year 9 months 25 days |

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