Business Combinations - Summary of Allocation of Purchase Consideration and Estimated Values of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands				3 Months Ended
	Jan. 15, 2021	Aug. 04, 2020	May 27, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Assets acquired
Goodwill				$ 234,779		$ 187,411
Consideration paid
Cash paid net of cash acquired				32,401	$ 34,941
Contingent consideration				19,331		$ 10,619
Red Sky Technologies Inc.
Assets acquired
Accounts receivable	$ 2,926
Other assets	242
Property and equipment	18
Goodwill	49,308
Total assets acquired	78,514
Liabilities assumed
Accounts payable	233
Accrued expenses	773
Deferred revenue	5,866
Deferred tax liabilities	7,048
Other liabilities	26
Net assets acquired	64,568
Consideration paid
Cash paid	55,400
Cash paid net of cash acquired	32,400			32,401
Fair value of common stock issued	23,032
Contingent consideration	9,135
Total				64,568
Red Sky Technologies Inc. | Acquired Technology
Assets acquired
Intangible assets other than goodwill	3,590
Red Sky Technologies Inc. | Trade Names
Assets acquired
Intangible assets other than goodwill	2,230
Red Sky Technologies Inc. | Customer Relationships
Assets acquired
Intangible assets other than goodwill	$ 20,200
Techwan SA
Assets acquired
Accounts receivable			$ 921
Other assets			254
Other current assets			235
Goodwill			12,678
Total assets acquired			20,928
Liabilities assumed
Accrued expenses			673
Deferred revenue			1,190
Deferred tax liabilities			838
Other current liabilities			927
Net assets acquired			17,300
Consideration paid
Cash paid net of cash acquired			9,400	9,301
Fair value of common stock issued			5,074
Acquisition-related deferred common stock consideration			895
Contingent consideration			2,030
Total			15,500	17,300
Techwan SA | Acquired Technology
Assets acquired
Intangible assets other than goodwill			1,160
Techwan SA | Trade Names
Assets acquired
Intangible assets other than goodwill			580
Techwan SA | Customer Relationships
Assets acquired
Intangible assets other than goodwill			$ 5,100
SnapComms Limited
Assets acquired
Accounts receivable		$ 1,808
Other assets		943
Other current assets		283
Property and equipment		118
Goodwill		22,629
Total assets acquired		42,341
Liabilities assumed
Accrued expenses		503
Deferred revenue		3,165
Deferred tax liabilities		4,960
Other current liabilities		742
Net assets acquired		32,971
Consideration paid
Cash paid net of cash acquired		13,600		10,090
Fair value of common stock issued		17,685
Acquisition-related deferred common stock consideration		3,149
Contingent consideration		2,047
Total		34,400		$ 32,971
SnapComms Limited | Acquired Technology
Assets acquired
Intangible assets other than goodwill		2,300
SnapComms Limited | Trade Names
Assets acquired
Intangible assets other than goodwill		960
SnapComms Limited | Customer Relationships
Assets acquired
Intangible assets other than goodwill		$ 13,300