Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue	$ 96,746	$ 71,256	$ 265,605	$ 195,533
Cost of revenue	30,310	20,885	83,255	61,197
Gross profit	66,436	50,371	182,350	134,336
Operating expenses:
Sales and marketing	42,426	31,395	118,436	89,724
Research and development	23,197	16,948	61,527	46,057
General and administrative	19,904	19,766	67,130	52,476
Total operating expenses	85,527	68,109	247,093	188,257
Operating loss	(19,091)	(17,738)	(64,743)	(53,921)
Other expense, net:
Interest and investment income	83	107	316	1,915
Interest expense	(9,792)	(6,062)	(26,007)	(17,982)
Loss on extinguishment of convertible notes and capped call modification		(44)	(2,925)	(44)
Other expense, net	(623)	(195)	(1,274)	(710)
Total other expense, net	(10,332)	(6,194)	(29,890)	(16,821)
Loss before income taxes	(29,423)	(23,932)	(94,633)	(70,742)
Benefit from (provision for) income taxes	745	(273)	10,345	1,932
Net loss	$ (28,678)	$ (24,205)	$ (84,288)	$ (68,810)
Net loss per share attributable to common stockholders:
Basic	$ (0.75)	$ (0.70)	$ (2.24)	$ (2.00)
Diluted	$ (0.75)	$ (0.70)	$ (2.24)	$ (2.00)
Weighted-average common shares outstanding:
Basic	38,407,313	34,738,572	37,610,147	34,406,665
Diluted	38,407,313	34,738,572	37,610,147	34,406,665