CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (unaudited) - USD ($) shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue		$ 121,375	$ 114,754	$ 358,524	$ 326,444
Cost of revenue	[1],[2],[3]	21,256	22,161	66,650	64,621
Gross profit		100,119	92,593	291,874	261,823
Operating expenses:
Research and development	[1],[3]	35,074	33,671	107,420	100,879
Sales and marketing	[1],[2],[3]	54,976	54,118	175,910	162,179
General and administrative	[1],[3]	25,929	24,466	83,383	71,958
Restructuring	[1],[2]	422	0	1,982	0
Total operating expenses		116,401	112,255	368,695	335,016
Loss from operations		(16,282)	(19,662)	(76,821)	(73,193)
Interest expense		3,092	2,337	7,696	6,940
Other non-operating expense, net		685	543	614	739
Loss before income taxes		(20,059)	(22,542)	(85,131)	(80,872)
Provision for income taxes		271	361	1,127	915
Net loss		$ (20,330)	$ (22,903)	$ (86,258)	$ (81,787)
Net loss per common share, basic		$ (0.14)	$ (0.15)	$ (0.58)	$ (0.56)
Net loss per common share, diluted		$ (0.14)	$ (0.15)	$ (0.58)	$ (0.56)
Weighted average number of basic shares outstanding		146,953	147,877	148,620	146,270
Weighted average number of diluted shares outstanding		146,953	147,877	148,620	146,270

[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.