Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenue	$ 71,256	$ 52,547	$ 195,533	$ 143,771
Cost of revenue	20,885	16,454	61,197	45,174
Gross profit	50,371	36,093	134,336	98,597
Operating expenses:
Sales and marketing	31,395	21,903	89,724	63,989
Research and development	16,948	12,877	46,057	37,164
General and administrative	19,766	13,435	52,476	34,457
Total operating expenses	68,109	48,215	188,257	135,610
Operating loss	(17,738)	(12,122)	(53,921)	(37,013)
Other expense, net:
Interest and investment income	107	1,032	1,915	3,541
Interest expense	(6,062)	(1,697)	(17,982)	(4,986)
Other expense, net	(239)	(35)	(754)	(129)
Total other expense, net	(6,194)	(700)	(16,821)	(1,574)
Loss before income taxes	(23,932)	(12,822)	(70,742)	(38,587)
Benefit from (provision for) income taxes	(273)	(99)	1,932	(531)
Net loss	$ (24,205)	$ (12,921)	$ (68,810)	$ (39,118)
Net loss per share attributable to common stockholders:
Basic	$ (0.70)	$ (0.39)	$ (2.00)	$ (1.19)
Diluted	$ (0.70)	$ (0.39)	$ (2.00)	$ (1.19)
Weighted-average common shares outstanding:
Basic	34,738,572	33,524,771	34,406,665	32,941,826
Diluted	34,738,572	33,524,771	34,406,665	32,941,826