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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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