CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Income Statement [Abstract]
Revenue		$ 120,163	$ 109,392	$ 237,149	$ 211,690
Cost of revenue	[1],[2],[3]	22,491	21,688	45,394	42,460
Gross profit		97,672	87,704	191,755	169,230
Operating expenses:
Research and development	[1],[3]	35,630	34,225	72,346	67,208
Sales and marketing	[1],[2],[3]	61,298	56,025	120,934	108,061
General and administrative	[1],[3]	29,537	24,170	57,454	47,492
Restructuring	[1],[2]	(3,323)	0	1,560	0
Total operating expenses		123,142	114,420	252,294	222,761
Loss from operations		(25,470)	(26,716)	(60,539)	(53,531)
Interest expense		2,378	2,304	4,604	4,603
Other non-operating (income) expense, net		63	(119)	(71)	196
Loss before income taxes		(27,911)	(28,901)	(65,072)	(58,330)
Provision for income taxes		640	336	856	554
Net loss		$ (28,551)	$ (29,237)	$ (65,928)	$ (58,884)
Net loss per share, basic and diluted		$ (0.19)	$ (0.20)	$ (0.44)	$ (0.40)
Weighted-average shares used in computing basic and diluted net loss per share		148,646	146,242	149,454	145,467

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

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

[3] (3) Includes transaction expenses associated with the terminated merger with Zendesk. See Note 1 for additional information.