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Stock-based Compensation - Schedule of Stock Based Compensation Cost (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense $ 113,506 $ 13,767 $ 6,807
Cost of revenue      
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense 1,733 177 205
Sales and marketing      
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense 15,746 1,122 1,020
Technology and development      
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense 38,796 2,703 1,314
General and administrative      
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense 56,557 9,719 4,170
Total stock-based compensation expense      
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense 112,832 13,721 6,709
Amount capitalized to internal-use software      
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]      
Total stock-based compensation expense $ 674 $ 46 $ 98