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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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- Definition Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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