Consolidated statements of operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Statement [Abstract]
Revenue	$ 219,855	$ 152,368	$ 112,103
Cost of revenue	48,479	34,126	27,023
Gross profit	171,376	118,242	85,080
Operating expenses:
Sales and marketing	99,350	72,470	60,740
Research and development	64,547	48,332	43,123
General and administrative	56,839	36,137	22,204
Acquisition related expenses	23,299	0	0
Amortization of intangible assets	3,284	0	0
Total operating expenses	247,319	156,939	126,067
Loss from operations	(75,943)	(38,697)	(40,987)
Interest income	130	31	245
Interest expense	(828)	(3,103)	(1,612)
Change in fair value of financial instruments		4,413
Other expense	(70)	(179)	(208)
Loss before provision for income taxes	(76,711)	(37,535)	(42,562)
Provision for income taxes	(34)	25	28
Net loss	(76,677)	(37,560)	(42,590)
Dividends and accretion of issuance costs on Series F preferred stock		(962)	(7,308)
Net loss attributable to common stockholders	$ (76,677)	$ (38,522)	$ (49,898)
Basic and diluted net loss per share attributable to common stockholders	$ (1.08)	$ (0.99)	$ (2.80)
Weighted average shares used to compute basic and diluted net loss per share attributable to common stockholders	70,933	39,092	17,834