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Fair Value Measurements (Narrative) (Details)							3 Months Ended				12 Months Ended
	May 19, 2021 USD ($) milestone	Feb. 17, 2021 USD ($)	Jan. 04, 2021 USD ($) milestone	Jun. 30, 2020 USD ($)	Mar. 02, 2020 USD ($)	Oct. 31, 2019 USD ($)	Mar. 31, 2022 USD ($) shares	Dec. 31, 2021 USD ($)	Dec. 31, 2020 shares	Jun. 30, 2020 USD ($)	Mar. 31, 2022 USD ($)	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of contingent consideration upon acquisition	$ 10,000,000										$ 9,973,000	$ 6,430,000
Payment of contingent consideration for business acquisition								$ 900,000			880,000	0	$ 0
Change in fair value of contingent consideration											(3,509,000)	5,716,000
Treasury shares reissued (in shares) | shares							4,010		390,397
Impairment of equity method investments											0	0	0
Equity securities without readily determinable fair value impairment											0	2,011,000	0
Initial cost basis of securities												2,000,000
Impairment of intangible assets											7,000,000	0	0
Discontinued Operations
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Impairment of intangible assets											7,000,000
Lifesize, Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment					$ 5,500,000
Proceeds from sale of equity method investments					$ 45,300,000
Marlin
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment							$ 21,400,000				21,400,000	26,700,000
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Equity method investment							40,200,000				40,200,000	40,700,000
Fair Value, Measurements, Recurring | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Fair value of marketable securities							$ 28,400,000				$ 28,400,000	24,800,000
Mevo
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Future potential earn-out payments		$ 17,000,000
Fair value of contingent consideration (earn-out)		$ 3,400,000										$ 3,400,000
Small Technology Acquisition
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Future potential earn-out payments	$ 10,000,000		$ 3,000,000
Number of technical development milestones | milestone	3		2
Streamlabs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Future potential earn-out payments				$ 29,000,000		$ 29,000,000
Fair value of contingent consideration (earn-out)						$ 37,000							$ 23,300,000
Change in fair value of contingent consideration										$ 5,700,000
Marlin
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Percent of voting interest acquired					8.90%
Marlin | Notes Payable, Other Payables
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis
Interest rate (as a percent)					6.00%
Debt instrument, term					5 years

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