CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Statement [Abstract]
Revenue		$ 114,754	$ 95,429	$ 326,444	$ 274,635
Cost of revenue	[1],[2]	22,161	21,899	64,621	62,852
Gross profit		92,593	73,530	261,823	211,783
Operating expenses:
Research and development	[1]	33,671	30,068	100,879	83,196
Sales and marketing	[1],[2]	54,118	43,875	162,179	128,544
General and administrative	[1]	24,466	22,181	71,958	65,452
Total operating expenses		112,255	96,124	335,016	277,192
Loss from operations		(19,662)	(22,594)	(73,193)	(65,409)
Interest expense		2,337	2,379	6,940	7,887
Other non-operating (income) expense, net		543	(143)	739	(1,277)
Loss before income taxes		(22,542)	(24,830)	(80,872)	(72,019)
Provision for income taxes		361	1,289	915	1,274
Net loss		$ (22,903)	$ (26,119)	$ (81,787)	$ (73,293)
Net loss per share, basic and diluted		$ (0.15)	$ (0.19)	$ (0.56)	$ (0.53)
Weighted-average shares used in computing basic and diluted net loss per share		147,877	141,034	146,270	138,907

[1] (1) Includes stock-based compensation, net of amounts capitalized as follows:

[2] (2) Includes amortization of acquisition intangible assets as follows: