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Stock-based Compensation - Schedule of Stock Based Compensation Cost (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | $ 44,967 | $ 3,369 | $ 48,922 | $ 7,711
Cost of revenue [Member] |  |  |  |
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | 762 | 46 | 821 | 83
Selling and Marketing Expense [Member] |  |  |  |
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | 5,143 | 144 | 5,350 | 787
Technology And Development [Member] |  |  |  |
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | 17,619 | 603 | 18,145 | 1,553
General and Administrative Expense [Member] |  |  |  |
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | 21,430 | 2,568 | 24,580 | 5,265
Expense Before Capitalized Software [Member] |  |  |  |
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | 44,954 | 3,361 | 48,896 | 7,688
Capitalized To Internal Use Software [Member] |  |  |  |
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items] |  |  |  |
Share based compensation expense | $ 13 | $ 8 | $ 26 | $ 23

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