Significant Accounting Policies - Additional Information (Details)		12 Months Ended
	Oct. 31, 2018 USD ($)	Dec. 31, 2021 USD ($) Segment	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Aug. 31, 2021 USD ($)
Accounting Policies [Line Items]
Number of operating segment | Segment		1
Net loss		$ (135,618,000)	$ (55,320,000)	$ (51,951,000)
Accumulated deficit		(702,869,000)	(567,251,000)
Cash and cash equivalents		1,514,064,000	673,593,000	466,950,000
Credit impairment losses recognized		0	0
Implementation cost capitalized		4,200,000	3,100,000
Implementation cost, impairment charge		700,000	0
Capitalized software development Costs		16,600,000	4,200,000	2,300,000
Impairment of operating lease right-of-use assets and related property and equipment			794,000
Impairment of long-lived assets		0
Goodwill impairment	$ 0	0	0	0
Income/expenses from increases decreases in fair value of earnout liabilities related to business combinations		$ 12,200,000	(2,300,000)	(1,000,000.0)
Tax position likely of being realized upon ultimate settlement		greater than 50%
Percentage of likelihood of realization of tax position upon ultimate settlement, minimum		50.00%
Contract payment net terms		30 days
Concessions and cancellations period allowed for standard subscription contract prior to adoption		60 days
Revenue recognition, contractual renewal period		1 year
Partner commissions expense		$ 40,000,000.0	30,200,000	22,000,000.0
Advertising expenses		35,500,000	24,300,000	20,200,000
Contribution to 401(k) plan		5,400,000	$ 3,600,000	$ 3,800,000
2026 Notes
Accounting Policies [Line Items]
Principal amount		$ 977,500,000			$ 977,500,000
Fixed interest rate					0.25%
Minimum
Accounting Policies [Line Items]
Revenue recognition initial contractual term		12 months
Minimum | Internally Developed Software
Accounting Policies [Line Items]
Property and equipment, Useful Life		3 years
Maximum
Accounting Policies [Line Items]
Revenue recognition initial contractual term		18 months
Maximum | Internally Developed Software
Accounting Policies [Line Items]
Property and equipment, Useful Life		6 years
Geographic Concentration Risk | Non-US | Revenue
Accounting Policies [Line Items]
Concentration risk		8.00%	6.00%	6.00%
Geographic Concentration Risk | Non-US | Long-lived Assets
Accounting Policies [Line Items]
Concentration risk		25.00%	27.00%
Geographic Concentration Risk | United Kingdom | Long-lived Assets
Accounting Policies [Line Items]
Concentration risk		9.00%	9.00%
Geographic Concentration Risk | India | Long-lived Assets
Accounting Policies [Line Items]
Concentration risk		12.00%	15.00%
Customer Concentration Risk | Revenue | Maximum
Accounting Policies [Line Items]
Concentration risk		10.00%	10.00%
Customer Concentration Risk | Accounts Receivable | Maximum
Accounting Policies [Line Items]
Concentration risk		10.00%	10.00%