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Financial Instruments - Additional Information (Details)			1 Months Ended		12 Months Ended
	Jul. 05, 2019 shares	Sep. 19, 2018 shares	Jun. 30, 2020 USD ($) shares	Jul. 31, 2019 USD ($)	Dec. 31, 2020 USD ($) Derivative	Dec. 31, 2019 USD ($) Derivative	Dec. 31, 2018 USD ($) Derivative shares
Schedule Of Investments [Line Items]
Cash, cash equivalents and short -term investments					$ 257,100,000	$ 121,500,000
Unrealized loss net of tax on marketable debt securities					100,000	100,000
Impairment charges related to marketable debt securities						$ 0	$ 0
Provision for credit loss expense related available for sale debt securities					$ 0
Derivative, number of instruments held | Derivative					0	0	0
TiVo Merger | Non-marketable Equity Securities
Schedule Of Investments [Line Items]
Equity securities accounted for under equity method					$ 4,200,000
Equity securities without a readily determinable fair value					100,000
Non-marketable equity securities, without a readily determinable fair value, impairments or adjustments					0	$ 0
Onkyo Corporation
Schedule Of Investments [Line Items]
Number of common shares purchased | shares		7,000,000
Ownership interest, percentage		6.30%
Number of investment shares sold | shares	2,800,000		4,200,000				0
Equity securities, realized gains or losses on sales			$ 700,000	$ 900,000
Operating Accounts
Schedule Of Investments [Line Items]
Cash, cash equivalents and short -term investments					$ 135,000,000.0	$ 72,000,000.0

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