Segment Information - Financial Information by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Total revenue	$ 514,800	$ 469,624	$ 366,620
Cost of revenue	184,699	156,880	106,268
Sales and marketing	214,027	165,421	149,773
Amortization of purchased intangible assets	3,678	2,045	1,639
Unallocated corporate expenses	334,280	238,544	198,391
Loss from operations	(221,884)	(93,266)	(89,451)
Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Cost of revenue	0	0	0
Sales and marketing	0	0	0
Amortization of purchased intangible assets	0	0	0
Unallocated corporate expenses	334,280	238,544	198,391
Loss from operations	(334,280)	(238,544)	(198,391)
Business | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	477,658	431,929	336,856
Cost of revenue	179,295	149,983	99,394
Sales and marketing	187,932	139,866	128,752
Amortization of purchased intangible assets	3,678	2,045	1,639
Unallocated corporate expenses	0	0	0
Loss from operations	106,753	140,035	107,071
Consumer | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	37,142	37,695	29,764
Cost of revenue	5,404	6,897	6,874
Sales and marketing	26,095	25,555	21,021
Amortization of purchased intangible assets	0	0	0
Unallocated corporate expenses	0	0	0
Loss from operations	5,643	5,243	1,869
Hosted Services - Business
Segment Reporting Information [Line Items]
Total revenue	375,325	364,231	286,588
Hosted Services - Business | Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Hosted Services - Business | Business | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	375,325	364,231	286,588
Hosted Services - Business | Consumer | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Hosted Services - Consumer
Segment Reporting Information [Line Items]
Total revenue	37,142	37,695	29,764
Hosted Services - Consumer | Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Hosted Services - Consumer | Business | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Hosted Services - Consumer | Consumer | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	37,142	37,695	29,764
Professional Services - Business
Segment Reporting Information [Line Items]
Total revenue	102,333	67,698	50,268
Professional Services - Business | Corporate
Segment Reporting Information [Line Items]
Total revenue	0	0	0
Professional Services - Business | Business | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	102,333	67,698	50,268
Professional Services - Business | Consumer | Operating Segments
Segment Reporting Information [Line Items]
Total revenue	$ 0	$ 0	$ 0