Business Combinations - Summary of Allocation of Purchase Consideration and Estimated Values of Assets Acquired and Liabilities Assumed (Details) - USD ($)									12 Months Ended
	Nov. 04, 2021	May 07, 2021	Jan. 15, 2021	Aug. 04, 2020	May 27, 2020	Mar. 19, 2020	Feb. 25, 2020	Feb. 07, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Assets acquired
Goodwill									$ 531,163,000	$ 187,411,000	$ 91,421,000
Consideration paid
Cash paid, net of cash acquired									262,084,000	55,138,000	58,419,000
Contingent consideration									59,000	10,619,000
Consideration loan notes issued									9,195,000	6,267,000	$ 550,000
Red Sky Technologies Inc.
Assets acquired
Accounts receivable			$ 2,926,000
Property and equipment			18,000
Goodwill			49,508,000
Other assets			242,000
Total assets acquired			78,514,000
Liabilities assumed
Accounts payable			233,000
Accrued expenses			773,000
Deferred revenue			5,866,000
Deferred tax liabilities			7,048,000
Other liabilities			26,000
Net assets acquired			64,568,000
Consideration paid
Cash paid, net of cash acquired			32,401,000
Fair value of common stock issued			23,032,000
Contingent consideration			9,135,000
Total									64,568,000
Red Sky Technologies Inc. | Tradenames
Assets acquired
Intangible assets other than goodwill			2,230,000
Red Sky Technologies Inc. | Acquired Technology
Assets acquired
Intangible assets other than goodwill			3,590,000
Red Sky Technologies Inc. | Customer Relationships
Assets acquired
Intangible assets other than goodwill			$ 20,000,000
xMatters Holdings, Inc
Assets acquired
Accounts receivable		$ 6,716,000
Property and equipment		1,458,000
Goodwill		170,437,000
Other assets		5,433,000
Total assets acquired		279,574,000
Liabilities assumed
Accounts payable		1,164,000
Accrued expenses		5,517,000
Deferred revenue		34,421,000
Deferred tax liabilities		3,436,000
Other liabilities		5,056,000
Net assets acquired		229,980,000
Consideration paid
Cash paid, net of cash acquired									165,498,000
Fair value of common stock issued		64,482,000
Total									229,980,000
xMatters Holdings, Inc | Tradenames
Assets acquired
Intangible assets other than goodwill		8,200,000
xMatters Holdings, Inc | Acquired Technology
Assets acquired
Intangible assets other than goodwill		8,390,000
xMatters Holdings, Inc | Customer Relationships
Assets acquired
Intangible assets other than goodwill		$ 78,940,000
Anvil
Assets acquired
Accounts receivable	$ 2,361,000
Property and equipment	204,000
Goodwill	128,849,000
Other assets	5,022,000
Total assets acquired	166,106,000
Liabilities assumed
Accounts payable	837,000
Accrued expenses	1,041,000
Deferred revenue	3,365,000
Deferred tax liabilities	5,618,000
Other liabilities	1,633,000
Net assets acquired	153,612,000
Consideration paid
Cash paid, net of cash acquired									63,897,000
Contingent consideration	60,000
Total									153,612,000
Consideration loan notes issued	89,655,000
Anvil | Tradenames
Assets acquired
Intangible assets other than goodwill	2,600,000
Anvil | Acquired Technology
Assets acquired
Intangible assets other than goodwill	3,800,000
Anvil | Customer Relationships
Assets acquired
Intangible assets other than goodwill	$ 23,270,000
Connexient
Assets acquired
Accounts receivable								$ 849,000
Prepaid expenses and other current assets								518,000
Property and equipment								9,000
Goodwill								14,343,000
Other assets								238,000
Total assets acquired								25,607,000
Liabilities assumed
Accounts payable								751,000
Accrued expenses								208,000
Deferred revenue								2,420,000
Deferred tax liabilities								2,011,000
Other liabilities								211,000
Net assets acquired								20,006,000
Consideration paid
Cash paid, net of cash acquired										10,991,000
Fair value of common stock issued								9,015,000
Contingent consideration								0
Total										20,006,000
Connexient | Tradenames
Assets acquired
Intangible assets other than goodwill								630,000
Connexient | Acquired Technology
Assets acquired
Intangible assets other than goodwill								1,220,000
Connexient | Customer Relationships
Assets acquired
Intangible assets other than goodwill								$ 7,800,000
CNL Software Limited
Assets acquired
Accounts receivable							$ 1,979,000
Prepaid expenses and other current assets							1,095,000
Property and equipment							731,000
Goodwill							28,679,000
Other assets							1,314,000
Total assets acquired							42,528,000
Liabilities assumed
Accounts payable							315,000
Accrued expenses							1,653,000
Deferred revenue							3,751,000
Deferred tax liabilities							1,553,000
Other liabilities							1,276,000
Net assets acquired							33,980,000
Consideration paid
Cash paid, net of cash acquired										18,030,000
Fair value of common stock issued							15,950,000
Total										33,980,000
CNL Software Limited | Tradenames
Assets acquired
Intangible assets other than goodwill							1,080,000
CNL Software Limited | Acquired Technology
Assets acquired
Intangible assets other than goodwill							2,150,000
CNL Software Limited | Customer Relationships
Assets acquired
Intangible assets other than goodwill							$ 5,500,000
One2Many Group B.V.
Assets acquired
Accounts receivable						$ 521,000
Other current assets						1,441,000
Property and equipment						19,000
Goodwill						10,704,000
Other assets						176,000
Total assets acquired						17,511,000
Liabilities assumed
Accounts payable						72,000
Accrued expenses						636,000
Deferred revenue						1,460,000
Deferred tax liabilities						985,000
Other current liabilities						136,000
Net assets acquired						14,222,000
Consideration paid
Cash paid, net of cash acquired										6,563,000
Fair value of common stock issued						5,469,000
Contingent consideration						2,190,000
Total										$ 14,222,000
One2Many Group B.V. | Tradenames
Assets acquired
Intangible assets other than goodwill						580,000
One2Many Group B.V. | Acquired Technology
Assets acquired
Intangible assets other than goodwill						970,000
One2Many Group B.V. | Customer Relationships
Assets acquired
Intangible assets other than goodwill						$ 3,100,000
Techwan SA
Assets acquired
Accounts receivable					$ 921,000
Other current assets					235,000
Goodwill					12,678,000
Other assets					254,000
Total assets acquired					20,928,000
Liabilities assumed
Accrued expenses					673,000
Deferred revenue					1,190,000
Deferred tax liabilities					838,000
Other current liabilities					927,000
Net assets acquired					17,300,000
Consideration paid
Cash paid, net of cash acquired									9,301,000
Fair value of common stock issued					5,074,000
Contingent consideration					2,030,000
Acquisition-related deferred common stock consideration					895,000
Total									17,300,000
Techwan SA | Tradenames
Assets acquired
Intangible assets other than goodwill					580,000
Techwan SA | Acquired Technology
Assets acquired
Intangible assets other than goodwill					1,160,000
Techwan SA | Customer Relationships
Assets acquired
Intangible assets other than goodwill					$ 5,100,000
SnapComms Limited
Assets acquired
Accounts receivable				$ 1,808,000
Other current assets				283,000
Property and equipment				118,000
Goodwill				22,629,000
Other assets				943,000
Total assets acquired				42,341,000
Liabilities assumed
Accrued expenses				503,000
Deferred revenue				3,165,000
Deferred tax liabilities				4,960,000
Other liabilities				742,000
Net assets acquired				32,971,000
Consideration paid
Cash paid, net of cash acquired									10,090,000
Fair value of common stock issued				17,685,000
Contingent consideration				2,047,000
Acquisition-related deferred common stock consideration				3,149,000
Total									$ 32,971,000
SnapComms Limited | Tradenames
Assets acquired
Intangible assets other than goodwill				960,000
SnapComms Limited | Acquired Technology
Assets acquired
Intangible assets other than goodwill				2,300,000
SnapComms Limited | Customer Relationships
Assets acquired
Intangible assets other than goodwill				$ 13,300,000