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Intangible Assets and Goodwill (Details 3) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Dec. 31, 2020
Components of intangible assets
Intangible assets, gross	$ 341,351	$ 301,982
Accumulated amortization	(278,920)	(265,495)
Finite-lived intangible assets	51,231
In-process research and development	11,200
Intangible assets, net	62,431	36,487
In-process research and development
Components of intangible assets
In-process research and development	11,200	1,600
Existing technology
Components of intangible assets
Gross carrying amount	292,058	263,789
Accumulated amortization	(243,728)	(230,950)
Finite-lived intangible assets	$ 48,330	$ 32,839
Existing technology | Minimum
Components of intangible assets
Useful life (in years)	3 years	3 years
Existing technology | Maximum
Components of intangible assets
Useful life (in years)	10 years	10 years
Customer contracts and contractual relationships
Components of intangible assets
Gross carrying amount	$ 37,793	$ 36,293
Accumulated amortization	(34,892)	(34,245)
Finite-lived intangible assets	$ 2,901	$ 2,048
Customer contracts and contractual relationships | Minimum
Components of intangible assets
Useful life (in years)	6 months	6 months
Customer contracts and contractual relationships | Maximum
Components of intangible assets
Useful life (in years)	10 years	10 years
Non-compete agreements and trademarks
Components of intangible assets
Gross carrying amount	$ 300	$ 300
Accumulated amortization	(300)	(300)
Finite-lived intangible assets	$ 0	$ 0
Useful life (in years)	3 years	3 years

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