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Stock Plans - Schedule of Stock-based Compensation Expense (Detail) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2021 | Mar. 31, 2020
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | $ 21,610 | $ 4,456
Sales and Marketing [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 898 | 178
Research and Development [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 1,019 | 237
General and Administrative [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 19,693 | 4,041
Restricted Stock Units [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 4,171 | 142
Stock Awards [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 19 | 62
Performance-based Stock Options [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 16,314 | 1,968
Stock Options [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 837 | 2,149
Common Stock Issued for Services [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | 119 |
Employee Stock Purchase Plan [Member] |  |
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items] |  |
Stock-based compensation expense | $ 150 | $ 135

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