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Share-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
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 4,428 | $ 3,645 | $ 5,981 | $ 4,702
Cost of net revenues |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 759 | 574 | 987 | 697
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 1,510 | 957 | 1,802 | 1,132
Sales and marketing |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 816 | 818 | 1,279 | 1,032
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 1,343 | $ 1,296 | 1,913 | $ 1,841
Stock Options |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense | 12,300 |  | $ 12,300 |
Recognition period |  |  | 2 years 9 months |
RSUs |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense | $ 600 |  | $ 600 |
Recognition period |  |  | 1 year 2 months 4 days |

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