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Stock-based Compensation - Schedule of Stock Based Compensation Cost (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	$ 38,074	$ 2,941	$ 86,996	$ 10,652
Cost of revenue
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	764	48	1,585	131
Sales and marketing
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	6,356	163	11,706	950
Technology and development
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	14,446	600	32,591	2,153
General and administrative
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	16,499	2,118	41,079	7,383
Total stock-based compensation expense
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	38,065	2,929	86,961	10,617
Amount capitalized to internal-use software
Schedule Of Share Based Compensation Employee Stock Purchase Plan Activity [Line Items]
Total stock-based compensation	$ 9	$ 12	$ 35	$ 35

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Schedule of share based compensation employee stock purchase plan activity.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
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-Section 50
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