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	)

Summarized financial information by segment for the year ended December 31, 2017, 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	$	178,686	$	—	$	—		$	178,686
Hosted services – Consumer	—		17,450		—			17,450
Professional services – Business	22,740		—		—			22,740
Total revenue	201,426		17,450		—			218,876
Cost of revenue	54,600		3,605		—			58,205
Sales and marketing	82,420		8,485		—			90,905
Amortization of purchased intangibles	1,840		—		—			1,840
Unallocated corporate expenses	—		—		85,752			85,752
Operating income (loss)	$	62,566	$	5,360	$	(85,752	)	$	(17,826	)