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v3.21.4

Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |  |  |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jun. 24, 2021 | Mar. 27, 2021 | Mar. 09, 2021 | Feb. 16, 2021 | Sep. 30, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Subsequent Event [Line Items] |  |  |  |  |  |  |
Severance costs related to the restructuring |  |  | $ 3.6 |  |  |  | $ 9.6
Performance deposit |  | $ 5.0 |  |  |  |  |
Escrow Agreement |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Escrow Shares | 1,200,000 |  |  |  |  | 1,200,000 |
Share price | $ 12.50 |  |  |  |  | $ 12.50 |
Minimum amount endeavor to spend to promote any commerce initiatives | $ 5.6 |  |  |  |  |  |
Commercial Agreement |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Minimum editorial promotion expense agreed to provide in each year |  |  |  |  | $ 1.0 | $ 1.0 |
Minimum amount endeavor to spend to promote any commerce initiatives |  |  |  |  |  | $ 1.0 |
Impressions per year |  |  |  |  |  | 200.0 |
Term of Commercial Agreement |  |  |  |  |  | 3 years |
Value of NBCU Base Shares |  |  |  |  |  | $ 400.0 |
Verizon Communications Inc |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of shares issued in exchange for concurrent cash investment |  |  |  | 12,544,803 |  |  |
Cash investment by an affiliate of Verizon |  |  |  | $ 35.0 |  |  |
HuffPost Acquisition |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Percentage of interest acquired |  |  |  | 100.00% |  |  |
Number of shares issued in exchange for concurrent cash investment |  |  |  |  | 12,544,803 |  |
Severance costs related to the restructuring |  |  | $ 3.6 |  |  |  |
HuffPost Acquisition | Commercial Agreement |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Minimum editorial promotion expense agreed to provide in each year |  |  |  |  | $ 1.0 |  |
Term of Commercial Agreement |  |  |  |  | 3 years |  |
Value of NBCU Base Shares |  |  |  |  | $ 400.0 |  |
HuffPost Acquisition | Class C Common stock | Verizon Communications Inc |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Number of shares issued |  |  |  | 21,170,037 |  |  |
Number of shares issued in exchange for the acquisition |  |  |  | 8,625,234 |  |  |
Complex Networks |  |  |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |  |  |
Percentage of interest acquired |  | 100.00% |  |  |  |  |
Cash consideration |  | $ 200.0 |  |  | $ 200.0 |  |
Shares of the post-merger company to be issued as consideration |  | 10,000,000 |  |  | 10,000,000 |  |

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