Stock-based Compensation - Schedule of Stock Based Compensation Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	$ 20,327	$ 38,074	$ 66,269	$ 86,996
Cost of revenue
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	597	764	2,205	1,585
Sales and marketing
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	2,972	6,356	9,633	11,706
Technology and development
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	3,857	14,446	12,303	32,591
General and administrative
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	12,352	16,499	40,349	41,079
Total stock-based compensation expense
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	19,778	38,065	64,490	86,961
Amount capitalized to internal-use software
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation expense	$ 549	$ 9	$ 1,779	$ 35