Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue:
Revenues	$ 698,977	$ 500,569	$ 382,421
Cost of revenue:
Cost of revenues	206,344	143,789	115,529
Gross profit	492,633	356,780	266,892
Operating expenses:
Research and development	171,016	121,578	82,989
Sales and marketing	298,462	206,049	169,118
General and administrative	140,093	97,258	72,394
Total operating expenses	609,571	424,885	324,501
Operating loss	(116,938)	(68,105)	(57,609)
Other income (expense):
Fair value changes in earnout liabilities	(12,231)	2,325	1,043
Interest income	108	1,678	6,037
Interest expense	(2,311)		(289)
Other income (expense), net	(938)	473	(178)
Total other income (expense), net	(15,372)	4,476	6,613
Loss before income taxes	(132,310)	(63,629)	(50,996)
(Provision for) benefit from income taxes	(3,308)	8,309	(955)
Net loss	$ (135,618)	$ (55,320)	$ (51,951)
Net loss per share attributable to common shareholders, basic and diluted	$ (1.57)	$ (0.68)	$ (0.71)
Weighted average shares of common stock outstanding, basic and diluted	86,263	80,985	73,345
Subscription and Returns
Revenue:
Revenues	$ 633,091	$ 465,825	$ 355,181
Cost of revenue:
Cost of revenues	174,604	124,924	98,007
Professional Services
Revenue:
Revenues	65,886	34,744	27,240
Cost of revenue:
Cost of revenues	$ 31,740	$ 18,865	$ 17,522