Summarized financial information by segment for the year ended December 31, 2020, based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands):


	Business		Consumer		Corporate		Consolidated
Revenue:
Hosted services – Business	$	286,588	$	—	$	—	$	286,588
Hosted services – Consumer	—		29,764		—		29,764
Professional services – Business	50,268		—		—		50,268
Total revenue	336,856		29,764		—		366,620
Cost of revenue	99,394		6,874		—		106,268
Sales and marketing	128,752		21,021		—		149,773
Amortization of purchased intangibles	1,639		—		—		1,639
Unallocated corporate expenses	—		—		198,391		198,391
Operating income (loss)	$	107,071	$	1,869	$	(198,391)	$	(89,451)

Summarized financial information by segment for the year ended December 31, 2019, based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands):


	Business		Consumer		Corporate		Consolidated
Revenue:
Hosted services – Business	$	225,705	$	—	$	—	$	225,705
Hosted services – Consumer	—		24,480		—		24,480
Professional services – Business	41,424		—		—		41,424
Total revenue	267,129		24,480		—		291,609
Cost of revenue	74,460		4,418		—		78,878
Sales and marketing	140,880		15,934		—		156,814
Amortization of purchased intangibles	1,794		—		—		1,794
Unallocated corporate expenses	—		—		141,155		141,155
Operating income (loss)	$	49,995	$	4,128	$	(141,155)	$	(87,032)

Summarized financial information by segment for the year ended December 31, 2018, based on the Company’s internal financial reporting system utilized by the Company’s chief operating decision maker, follows (amounts in thousands):


	Business		Consumer		Corporate		Consolidated
Revenue:
Hosted services – Business	$	197,474	$	—	$	—	$	197,474
Hosted services – Consumer	—		19,553		—		19,553
Professional services – Business	32,811		—		—		32,811
Total revenue	230,285		19,553		—		249,838
Cost of revenue	58,420		4,059		—		62,479
Sales and marketing	94,339		9,005		—		103,344
Amortization of purchased intangibles	1,670		—		—		1,670
Unallocated corporate expenses	—		—		106,048		106,048
Operating income (loss)	$	75,856	$	6,489	$	(106,048)	$	(23,703)