v3.21.2

Goodwill and Intangible Assets - Narrative (Details)		3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 01, 2021 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Sep. 30, 2021 USD ($) reportingUnit operatingSegment	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jun. 30, 2021 USD ($)
Finite-Lived Intangible Assets [Line Items]
Goodwill		$ 512,869,000		$ 512,869,000		$ 462,274,000
Number of operating segments | operatingSegment				1
Number of reporting units | reportingUnit				1
Impairment of goodwill				$ 0		0
Amortization of acquired intangibles		4,483,000	$ 4,465,000	13,465,000	$ 13,447,000
Gross intangible assets		257,285,000		257,285,000		243,423,000
ClickSWITCH
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 50,595,000						$ 50,600,000
Estimated useful life	5 years 1 month 6 days
Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Gross intangible assets		9,010,000		9,010,000		$ 5,103,000
Amortization of capitalized software development costs		400,000	200,000	800,000	600,000
Cost of revenues
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangibles		5,600,000	5,300,000	16,400,000	16,200,000
Operating expenses
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired intangibles		$ 4,500,000	$ 4,500,000	$ 13,500,000	$ 13,400,000
Minimum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				2 years
Minimum | ClickSWITCH
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				2 years
Minimum | Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				3 years
Maximum
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				10 years
Maximum | ClickSWITCH
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				6 years
Maximum | Capitalized software development costs
Finite-Lived Intangible Assets [Line Items]
Estimated useful life				5 years

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- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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