Consolidated Statements of Operations - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 515,657	$ 429,899	$ 276,327
Cost of revenue	236,024	209,253	143,510
Gross profit	279,633	220,646	132,817
Operating expenses
Sales and marketing	227,023	192,600	126,436
Research and development	66,107	50,643	34,379
General and administrative	64,410	50,783	40,033
Total operating expenses	357,540	294,026	200,848
Loss from operations	(77,907)	(73,380)	(68,031)
Other income (expense)
Interest income (expense), net	(16)	(1,146)	87
Other income (expense), net	(920)	55	(384)
Total other expense, net	(936)	(1,091)	(297)
Net loss before taxes	(78,843)	(74,471)	(68,328)
Income tax provision	(1,183)	(3,149)	(1,375)
Net loss attributable to common stockholders	$ (80,026)	$ (77,620)	$ (69,703)
Net loss per share attributable to common stockholders
Basic (in dollars per share)	$ (1.46)	$ (2.33)	$ (2.57)
Diluted (in dollars per share)	$ (1.46)	$ (2.33)	$ (2.57)
Weighted-average shares used in computing net loss per share attributable to common stockholders
Basic (in shares)	54,972,827	33,384,438	27,096,379
Diluted (in shares)	54,972,827	33,384,438	27,096,379