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Noncash Share-based Compensation Expense (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 8,634 | $ 6,378 | $ 25,410 | $ 18,477
Cost of Sales [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 951 | 519 | 2,753 | 1,545
Selling and Marketing Expense [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 2,600 | 1,727 | 7,334 | 5,558
General and Administrative Expense [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 3,159 | 2,593 | 9,456 | 6,960
Research and development |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | 1,924 | 1,539 | 5,867 | 4,414
Operating Expense [Member] |  |  |  |
Employee Service Share-based Compensation, Allocation of Recognized Period Costs [Line Items] |  |  |  |
Share-based compensation expense | $ 7,683 | $ 5,859 | $ 22,657 | $ 16,932

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