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Stock-Based Compensation Expense - Additional Information (Details) - USD ($) shares in Thousands, $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Jun. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of unvested equity awards assumed				$ 34.1
Total intrinsic value of options exercised	$ 0.1	$ 0.2	$ 1.0
Unrecognized stock-based compensation balance after estimated forfeitures related to unvested stock options	$ 0.1	$ 0.1
Estimated weighted average amortization period	2 years 8 months 12 days	2 years 3 months 18 days
Issuance of common stock in connection with employee common stock purchase plan (in shares)	355	386	306
Black Scholes Option Pricing Model
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected life (in years)	2 years
Restricted Stock and Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Restricted stock awards, total fair value	$ 45.7	$ 30.1	$ 30.4
Unrecognized stock-based compensation balance after estimated forfeitures related to unvested stock options	$ 73.5	$ 40.3
Estimated weighted average amortization period	9 months 18 days	1 year 6 months
TiVo Merger
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Fair value of unvested equity awards assumed				$ 22.0
Recognized stock based compensation expense of unvested equity awards assumed	$ 5.8

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