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Share-based Compensation (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 1,253 | $ 1,734 | $ 5,955 | $ 3,678
Cost of net revenues |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 202 | 153 | 899 | 227
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 183 | 564 | 1,315 | 972
Sales and marketing |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 307 | 313 | 1,339 | 761
General and administrative |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 561 | $ 704 | 2,402 | $ 1,718
Stock Options |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense | 6,200 |  | $ 6,200 |
Recognition period |  |  | 2 years 9 months 14 days |
Restricted Stock Units (RSUs) |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Unrecognized expense | $ 600 |  | $ 600 |
Recognition period |  |  | 1 year 1 month 17 days |

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